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cheese007

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  1. Tor warned supercell heading towards the Lampasas area

    Tornado Warning
    TXC281-190000-
    /O.NEW.KFWD.TO.W.0005.240418T2319Z-240419T0000Z/
    
    BULLETIN - EAS ACTIVATION REQUESTED
    Tornado Warning
    National Weather Service Fort Worth TX
    619 PM CDT Thu Apr 18 2024
    
    The National Weather Service in Fort Worth has issued a
    
    * Tornado Warning for...
      Southwestern Lampasas County in central Texas...
    
    * Until 700 PM CDT.
    
    * At 618 PM CDT, a severe thunderstorm capable of producing a
      tornado was located 20 miles northwest of Lampasas, moving
      southeast at 10 mph.
    
      HAZARD...Tornado and golf ball size hail.
    
      SOURCE...Radar indicated rotation.
    
      IMPACT...Flying debris will be dangerous to those caught without
               shelter. Mobile homes will be damaged or destroyed.
               Damage to roofs, windows, and vehicles will occur.  Tree
               damage is likely.
    
    * This tornadic thunderstorm will remain over mainly rural areas of
      southwestern Lampasas County, including the following locations...
      Lometa and Nix.
    
    PRECAUTIONARY/PREPAREDNESS ACTIONS...
    
    TAKE COVER NOW! Move to an interior room on the lowest floor of a
    sturdy building. Avoid windows. If you are outdoors, in a mobile
    home, or in a vehicle, move to the closest substantial shelter and
    protect yourself from flying debris.
    
    &&
    
    LAT...LON 3125 9853 3134 9838 3117 9824 3109 9842
    TIME...MOT...LOC 2318Z 330DEG 10KT 3127 9842
    
    TORNADO...RADAR INDICATED
    MAX HAIL SIZE...1.75 IN
    
    $$
    
    Dunn
  2. First tor watch out for the day with 40/20 probs

    SEL0
    
       URGENT - IMMEDIATE BROADCAST REQUESTED
       Tornado Watch Number 110
       NWS Storm Prediction Center Norman OK
       230 PM CDT Mon Apr 15 2024
    
       The NWS Storm Prediction Center has issued a
    
       * Tornado Watch for portions of 
         Southwest Oklahoma
         Northwest Texas
    
       * Effective this Monday afternoon and evening from 230 PM until
         900 PM CDT.
    
       * Primary threats include...
         A couple tornadoes possible
         Scattered large hail and isolated very large hail events to 3
           inches in diameter likely
         Scattered damaging winds and isolated significant gusts to 75
           mph possible
    
       SUMMARY...Severe thunderstorms are expected to develop in the next 1
       to 2 hours across northwest Texas and shift east through early
       evening. Large hail and damaging gusts are possible initially, with
       an increasing tornado risk expected during the evening.
    
       The tornado watch area is approximately along and 70 statute miles
       east and west of a line from 40 miles west southwest of San Angelo
       TX to 50 miles northwest of Wichita Falls TX. For a complete
       depiction of the watch see the associated watch outline update
       (WOUS64 KWNS WOU0).
    
       PRECAUTIONARY/PREPAREDNESS ACTIONS...
    
       REMEMBER...A Tornado Watch means conditions are favorable for
       tornadoes and severe thunderstorms in and close to the watch
       area. Persons in these areas should be on the lookout for
       threatening weather conditions and listen for later statements
       and possible warnings.
    
       &&
    
       OTHER WATCH INFORMATION...CONTINUE...WW 109...
    
       AVIATION...Tornadoes and a few severe thunderstorms with hail
       surface and aloft to 3 inches. Extreme turbulence and surface wind
       gusts to 65 knots. A few cumulonimbi with maximum tops to 500. Mean
       storm motion vector 24035.
    
       ...Leitman
  3. 30% contour expanded for D5 with an addition of a 15% contour on D6. Pretty strong wording in the latest discussion text:

     

    ZCZC SPCSWOD48 ALL
       ACUS48 KWNS 110856
       SPC AC 110856
    
       Day 4-8 Convective Outlook  
       NWS Storm Prediction Center Norman OK
       0356 AM CDT Thu Apr 11 2024
    
       Valid 141200Z - 191200Z
    
       ...DISCUSSION...
       ...Significant severe weather episode possible late afternoon and
       evening on Monday...
       A mid/upper low over the central CA vicinity at 12Z Sunday should
       evolve into an open wave as it ejects across the Southwest and into
       the central Great Plains by around Tuesday morning. As it crosses
       the Rockies onto the High Plains, the tropospheric flow field will
       amplify with substantial lee cyclogenesis in the central High Plains
       on Monday afternoon. While a moderate amount of spread persists
       across respective ensemble systems, 00Z deterministic runs have
       converged towards greater agreement with the aforementioned scenario
       through D5, with progressively lower predictability in D6-8. 
    
       With about 3 days of persistent low-level moisture modification from
       the western Gulf beneath an extensive elevated mixed layer, the
       northern extent of mid 60s surface dew points should reach into most
       of OK east of the dryline by Monday afternoon. Late afternoon
       thunderstorm initiation along the dryline appears probable in the
       eastern TX Panhandle/western north TX to western OK vicinity, within
       a kinematic and thermodynamic profile favorable for strong
       supercells. Convective development will blossom both south and
       especially north extent during the evening across the central and
       southern Great Plains. For this outlook, have expanded the 30
       percent area to highlight the greater spatial confidence in a
       substantial severe weather episode.
    
       Despite increasing predictability concerns and the impact of prior
       day convection, very strong flow fields should persist into at least
       the first half of D6/Tuesday as a deep surface cyclone pivots
       northeast towards the Upper MS Valley vicinity. While instability
       will be weaker compared to Monday, organized severe potential is
       evident within an arc from a portion of the Upper MS Valley to the
       Mid-South.
    
       In the wake of this lead system, the shortwave trough digging into
       the Pacific Northwest may carve out a broad, positive-tilt trough in
       the West by mid-week. Consensus of guidance suggests that rich
       low-level moisture over the southern Great Plains will not be
       scoured by the lead wave. This may yield daily bouts of severe
       thunderstorms across parts of the central and southern Great Plains
       late in the period and beyond. Predictability for individual day
       highlights is too low to warrant 15 percent probabilities yet.
    
       ..Grams.. 04/11/2024

    Screenshot_20240411_053148.jpg

    Screenshot_20240411_053209.jpg

    • Like 3
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  4. D1 hatched mod risk with an ongoing tor watch at 70/50 probs covering Baton Rouge and New Orleans

     

    SEL1
    
       URGENT - IMMEDIATE BROADCAST REQUESTED
       Tornado Watch Number 101
       NWS Storm Prediction Center Norman OK
       600 AM CDT Wed Apr 10 2024
    
       The NWS Storm Prediction Center has issued a
    
       * Tornado Watch for portions of 
         Southeast Louisiana
         Central and Southern Mississippi
         Coastal Waters
    
       * Effective this Wednesday morning and afternoon from 600 AM
         until 100 PM CDT.
    
       * Primary threats include...
         A few tornadoes likely with a couple intense tornadoes possible
         Widespread damaging winds and isolated significant gusts to 80
           mph likely
         Scattered large hail events to 1.5 inches in diameter possible
    
       SUMMARY...A destabilizing airmass across the central Gulf Coast will
       support an increasing severe thunderstorm and tornado risk this
       morning into the midday.  The tornado risk will likely maximize with
       any supercells that develop within the warm sector as the marine
       warm front advances northward.  A squall line will move west to east
       across the area with a risk for damaging gusts and the tornado risk
       will likely focus with any sustained mesovortex or embedded
       supercell.
    
       The tornado watch area is approximately along and 85 statute miles
       east and west of a line from 95 miles northwest of Meridian MS to 45
       miles west southwest of Boothville LA. For a complete depiction of
       the watch see the associated watch outline update (WOUS64 KWNS
       WOU1).
    
       PRECAUTIONARY/PREPAREDNESS ACTIONS...
    
       REMEMBER...A Tornado Watch means conditions are favorable for
       tornadoes and severe thunderstorms in and close to the watch
       area. Persons in these areas should be on the lookout for
       threatening weather conditions and listen for later statements
       and possible warnings.
    
       &&
    
       OTHER WATCH INFORMATION...CONTINUE...WW 99...WW 100...
    
       AVIATION...Tornadoes and a few severe thunderstorms with hail
       surface and aloft to 1.5 inches. Extreme turbulence and surface wind
       gusts to 70 knots. A few cumulonimbi with maximum tops to 500. Mean
       storm motion vector 25040.
    
       ...Smith

     

    Screenshot_20240410_074852.jpg

    Screenshot_20240410_074920.jpg

  5. Ohio Valley under the gun today with a big 15% sigtor hatched risk. D2 also has a slight risk for parts of FL and the mid-Atlantic

    SPC AC 020600
    
       Day 1 Convective Outlook  
       NWS Storm Prediction Center Norman OK
       0100 AM CDT Tue Apr 02 2024
    
       Valid 021200Z - 031200Z
    
       ...THERE IS A MODERATE RISK OF SEVERE THUNDERSTORMS ACROSS THE OHIO
       VALLEY...
    
       ...SUMMARY...
       A potentially substantial severe weather outbreak -- possibly
       including a few significant/long-track tornadoes -- is anticipated
       this afternoon and evening, with the highest probability centered
       over the Ohio Valley.  Severe risk exists as far south as the Gulf
       Coast, and as far east as western portions of Virginia and the
       Carolinas.
    
       ...Discussion...
    
       Strong northern-stream upper low, currently located over southern
       MB, is forecast to drop south across MN into northern IL late in the
       period. This evolution is driven in part by a 500mb speed max that
       will translate across the central Plains, increasing to near 100kt
       over eastern KS/OK by 03/12z. Intense 12hr midlevel height falls are
       forecast across much of the Great Lakes, OH/TN Valley, and the
       northern Gulf States, where values in excess of 200m are expected
       during the latter half of the period. Synoptic front that is
       currently draped across the OH Valley will be encouraged to
       gradually advance north due to the digging trough; however, an
       extensive corridor of convection currently extends across the MS
       Valley into the OH valley, which is maintaining cool boundary-layer
       conditions north of I-70.
    
       Latest water-vapor imagery suggests a southern-stream short-wave
       trough is progressing across eastern KS/eastern OK. This feature
       will progress downstream and likely aid early-day thunderstorm
       development near the confluence of the MS/OH Rivers. Seasonally high
       PW airmass currently extends across northern AR/southern MO into
       southern IL. NAM forecast sounding for JBR at 15z exhibits 60kt
       surface-6km bulk shear with SBCAPE on the order of 1500 J/kg.
       Discrete supercells may evolve ahead of this feature then
       spread/develop northeast across southern IN/KY into OH. Some
       uncertainty exists across northern OH/IN regarding destabilization.
       It's not entirely clear if ongoing convection will allow the warm
       front to lift appreciably north of its current position. However,
       large-scale pattern is quite dynamic and favors surface low
       deepening over southern Lake MI during the latter half of the
       pattern. NAM struggles to reflect this scenario, thus weaker
       instability is forecast at higher latitudes. Tornadoes, damaging
       winds, and large hail are expected with supercells that evolve
       across the warm sector. Some tornadoes may be long-lived and strong.
    
    
       Farther south, a bimodal severe threat may ultimately evolve with a
       secondary corridor of more concentrated severe across portions of
       the northern Gulf States. 500mb speed max is forecast to eject
       across northern Mexico into TX by 03/00z. This feature will
       intensify as it translates across LA into eastern TN by the end of
       the period. There is some concern that severe probabilities may need
       to be increased across this region to account for this low-latitude
       speed max during the evening/overnight hours. Strong shear will
       support supercells along with a threat for tornadoes, damaging
       winds, and hail.
    
       ..Darrow/Bentley.. 04/02/2024

    Screenshot_20240402_063504.jpg

    Screenshot_20240402_063533.jpg

    Screenshot_20240402_063845.jpg

  6. Another early week system with a big D5 15% and a D6 15% for outside this subforum.

     

    Screenshot_20240328_085326.jpg

    Screenshot_20240328_085352.thumb.jpg.ba3fc74983339cca2c08ad13ac254d82.jpg

       ZCZC SPCSWOD48 ALL
       ACUS48 KWNS 280900
       SPC AC 280900
    
       Day 4-8 Convective Outlook  
       NWS Storm Prediction Center Norman OK
       0400 AM CDT Thu Mar 28 2024
    
       Valid 311200Z - 051200Z
    
       ...DISCUSSION...
       ...Day 4/Sunday: Mid Mississippi Valley into the Central/Southern
       Plains...
       The upper trough/low over the western states should slowly advance
       eastward towards the Southwest and southern/central High Plains on
       Sunday. Upper ridging is forecast to remain over the central/
       southern Plains through Sunday night, which in tandem with a
       low-level temperature inversion should tend to suppress most
       convection. One possible exception may be along a sharpening warm
       front across MO/IL, where some guidance suggests elevated convection
       may form either Sunday morning, and/or Sunday night with strong
       low-level warm advection/lift occurring. Steepening mid-level lapse
       rates are forecast to overspread the mid MS Valley from the
       southwest through the period. These lapse rates, along with
       increasing moisture/instability in the presence of strong deep-layer
       shear, may support a risk for isolated supercells with associated
       threat for large hail. Regardless, confidence remains too low in
       this mainly elevated convection occurring, given upper ridging
       persisting, to add a 15% severe area for Sunday along/near the warm
       front in MO/IL at this time.
    
       ...Day 5/Monday: Southern/Central Plains into the Mid Mississippi
       and Ohio Valleys...
       Even though some differences remain in medium-range guidance
       regarding the ejection of an upper trough over the central CONUS on
       Monday, confidence has increased in the general location of relevant
       surface features, including the primary low, position of a
       southward-extending dryline, and northward extent of the warm front
       into the OH Valley. Even though the overall upper trough orientation
       may remain somewhat positively tilted, most deterministic guidance
       shows that a mid-level speed max and associated shortwave trough
       will eject northeastward over the southern/central Plains through
       Monday evening. Low-level mass response should encourage the
       eastward development of a surface low to the OK/KS vicinity in a
       similar time frame. Favorable low-level trajectories emanating from
       the Gulf will act to increase low-level moisture in tandem with
       steepening mid-level lapse rates and daytime heating across a broad
       warm sector extending from the southern/central Plains into the
       lower/mid MS Valley and OH Valley.
    
       A favorable thermodynamic and kinematic environment for organized
       severe convection will exist across much of these regions, with
       supercells capable of producing large hail and tornadoes possible
       initially. With time Monday evening/night, some upscale growth seems
       probable across the mid MS and OH Valleys, as mid-level flow should
       become increasingly parallel to a surface cold front. Therefore, a
       15% severe area has been introduced for Monday where confidence is
       greatest that robust convection will develop in a parameter space
       characterized by weak/moderate instability and strong deep-layer
       shear. A nocturnal minimum in severe convective potential may be
       realized Monday night into early Tuesday morning across parts of the
       lower MS Valley into Mid-South, given the positively tilted nature
       of the upper trough.
    
       ...Day 6/Tuesday: Ohio/Tennessee Valleys into the Appalachians...
       Some severe threat should continue Tuesday over parts of the OH/TN
       Valleys into the Appalachians as the upper trough continues
       eastward. Even though there is still some uncertainty with the exact
       placement of the primary surface low and evolution of the upper
       trough, enough confidence exists in a fairly narrow corridor across
       these regions to add a 15% severe area for Tuesday. Rich low-level
       moisture should be in place ahead of an eastward-moving cold front.
       Redevelopment and/or re-intensification of convection seems probable
       by Tuesday afternoon. Strong deep-layer shear and weak instability
       should be sufficient for organized severe convection posing some
       threat for damaging winds, and perhaps tornadoes given the forecast
       strength of a low-level jet focused over parts of the OH/TN Valleys.
       The northward extent of the severe risk across OH and vicinity
       remains uncertain, as the placement of the warm front varies in
       model guidance. Similarly, convection should eventually encounter a
       less unstable airmass across the Appalachians. But, an isolated
       severe risk may continue Tuesday evening into early Wednesday
       morning across the southern/central Appalachians into portions of
       the Southeast.
    
       ...Day 7/Wednesday and Day 8/Thursday...
       Predictability remains too low to include a 15% severe delineation
       for Wednesday across the Mid-Atlantic/Southeast along/ahead of a
       cold front. By this extended time frame, there are significant
       differences in model guidance regarding the evolution of the upper
       trough, including its possible interaction/merging with a
       northern-stream trough, and placement of relevant surface features.
       Still, at least an isolated severe risk may persist Wednesday
       along/ahead of the eastward-sweeping cold front. Once this front
       clears the East Coast, severe potential appears minimal across the
       CONUS next Thursday.
    
       ..Gleason.. 03/28/2024
    
       CLICK TO GET WUUS48 PTSD48 PRODUCT
    
    • Like 1
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  7. D2 ENH with Sigtor hatch

    SPC AC 241723
    
       Day 2 Convective Outlook  
       NWS Storm Prediction Center Norman OK
       1223 PM CDT Sun Mar 24 2024
    
       Valid 251200Z - 261200Z
    
       ...THERE IS AN ENHANCED RISK OF SEVERE THUNDERSTORMS ACROSS PORTIONS
       OF THE LOWER MISSISSIPPI VALLEY...
    
       ...SUMMARY...
       Severe thunderstorms with a threat for a few tornadoes and damaging
       winds are possible Monday through Monday night from parts of east
       Texas through the Lower Mississippi Valley.
    
       ...Synopsis...
       Deep upper troughing is forecast to be in place across the central
       CONUS early Monday morning. Several shortwave troughs will be
       embedded within this large parent upper troughing, including one
       over the Mid MO Valley and another over the southern High Plains. 
       The northern shortwave is forecast to continue northward through the
       Upper MS Valley while the southern shortwave moves quickly
       northeastward across eastern OK/northeast TX and into the Mid MS
       Valley. Evolution of these shortwaves, in particularly the southern
       High Plains shortwave, will induce a more negative tilt to the
       parent upper trough as the entire system gradually shifts eastward.
    
       The surface pattern early Monday morning will be complicated by an
       ongoing convective line across TX, but the general expectation is
       for a low to be over central KS with the primary cold front
       extending southwest from this low across the TX Panhandle into
       northeast NM. A secondary cold front/dry line will also extend
       southward from this low across central OK and north TX into the TX
       Hill Country. Showers and thunderstorms will likely be ongoing along
       an outflow boundary preceding this secondary cold front/dry line
       from southwest MO through western AR and northeast TX. The cold
       fronts and convective line are all forecast to progress eastward
       throughout the day, with some intensification of the convective line
       possible as it interacts with the greater low-level moisture over
       the Lower MS Valley. Thunderstorm development is also expected
       farther north across western IA as the primary surface low moves
       through during the afternoon.
    
       ...Mid-South into the Lower MS Valley...
       Favorable low-level moisture will exist ahead on the convective line
       expected to be ongoing early Monday from southwest MO through
       northeast TX, contributing to modest buoyancy despite widespread
       cloud cover and relatively cool surface temperatures. Generally
       modest convection will likely be ongoing within this line early
       Monday, but the expectation is for the line to reintensify during
       the early afternoon as large-scale forcing increases, the cold front
       catches up to the line, and buoyancy reaches its diurnal max. This
       reintensification will likely begin near the TX/LA border, with
       storms reaching their maximum intensity across far southeast AR,
       eastern LA, and western MS.
    
       Very impressive wind fields are anticipated across the region, with
       southeasterly surface winds ahead of the line contributing to large,
       looping low-level hodographs. Additionally, very strong
       southwesterly mid-level flow will support a southwesterly deep-layer
       shear vector with a notable line-perpendicular orientation.
       Consequently, there is likely a risk for a robust, forward
       propagating line capable of both strong gusts and embedded QLCS
       tornadoes. Also, given that the line is expected to be fairly weak
       at the beginning of the period, there is some chance for more
       discrete updrafts as the reintensification of the line begins,
       particularly with southern extent. The airmass will become less
       unstable with eastward extent into AL, and the expectation is for
       the overall intensity of the line to weaken as it moves into AL
       overnight.
    
        ...Western Iowa/Far Northwest MO and Vicinity...
       Within the larger-scale upper trough over the central states, an
       embedded, cold-core mid-level shortwave trough will move quickly
       northeastward across the Upper Midwest Monday. Most guidance still
       shows low 50s surface dewpoints present near a deep surface low
       across western IA and vicinity Monday afternoon. Given the cold
       mid-level temperatures, only modest daytime heating is needed for
       airmass destabilization. Deep-layer shear appears strong enough for
       a few organized thunderstorms and isolated/marginally severe hail
       and strong/gusty winds may occur with any sustained low-topped
       convection.
    
       ..Mosier.. 03/24/2024

    Screenshot_20240324_181633.jpg

    Screenshot_20240324_181653.jpg

  8. SPC has put out a D5 15% contour with hints at more unsettled weather in the following days

    image.png.ce95c5d6266d0b18bd8aa4999e1f6b43.png

    ZCZC SPCSWOD48 ALL
       ACUS48 KWNS 200900
       SPC AC 200900
    
       Day 4-8 Convective Outlook  
       NWS Storm Prediction Center Norman OK
       0400 AM CDT Wed Mar 20 2024
    
       Valid 231200Z - 281200Z
    
       ...DISCUSSION...
       Medium-range models suggest that blocking centered over the
       northeastern Pacific will break down this weekend, as a more
       progressive regime shifts across the central into eastern
       mid-latitude Pacific, and gradually inland through much of the U.S.
       by the middle to latter portion of next week.  Initially, flow
       downstream of the weakening blocking may undergo amplification,
       including mid-level troughing offshore of the southern Atlantic
       Seaboard, and larger-scale mid-level troughing progressing inland of
       the U.S. Pacific coast through the Great Plains and Mississippi
       Valley through early next week.  
    
       Within the inland advancing troughing, there appears reasonable
       agreement between the ECENS/ECMWF, GEFS and GFS model output that a
       significant lead short wave perturbation will accelerate
       northeastward out of the Southwest across the southern Rockies late
       Sunday into Sunday night.  As this occurs, a rather deep cyclone is
       forecast to continue to form to the lee of the Front Range during
       the day, before migrating southeastward then eastward into the
       adjacent high plains.  Although it still appears that low-level
       moisture return in the wake of prior low-level drying and cooling
       across the northern Gulf Basin may still be on the margins for
       vigorous thunderstorms, the development of steep
       lower/mid-tropospheric lapse rates may compensate.  Coupled with
       potentially intense wind fields and strong forcing for ascent,
       organized severe thunderstorm development seems probable late Sunday
       afternoon into Sunday night.  This may include supercells initially,
       then an evolving narrow squall line.
    
       Into the early through middle portion of next week, uncertainties
       concerning a subsequent short wave emerging from the Southwest
       increase.  However, it appears probable that there will be at least
       narrow corridors of strong to severe thunderstorm development on
       following days across the southeastern Great Plains into lower
       Mississippi Valley and perhaps parts of the Southeast.
    
       ..Kerr.. 03/20/2024
    
       CLICK TO GET WUUS48 PTSD48 PRODUCT
  9. 23 hours ago, Sydney Claridge said:

    We have a tornado warning in the Frisco, TX area now. Somewhat broad rotation but it bears close watching; the hail is a huge threat regardless of any tornadic activity, though.

    IMG_6340.png

    This storm ended up dropping a brief EF-0 over the UNT Frisco parking lot

    • Like 1
  10. 50/30 tor probs
    
    URGENT - IMMEDIATE BROADCAST REQUESTED
       Tornado Watch Number 42
       NWS Storm Prediction Center Norman OK
       1110 AM CDT Thu Mar 14 2024
    
       The NWS Storm Prediction Center has issued a
    
       * Tornado Watch for portions of 
         Central/eastern Oklahoma
         North-central Texas
    
       * Effective this Thursday morning and evening from 1110 AM until
         600 PM CDT.
    
       * Primary threats include...
         A few tornadoes and a couple intense tornadoes possible
         Widespread large hail and scattered very large hail events to 3
           inches in diameter likely
         Scattered damaging wind gusts to 70 mph possible
    
       SUMMARY...Supercell thunderstorms will continue to increase in
       coverage and intensity through the afternoon, while posing a threat
       for very large hail, severe/damaging winds, and a few tornadoes.
    
       The tornado watch area is approximately along and 65 statute miles
       east and west of a line from 45 miles east northeast of Tulsa OK to
       65 miles southwest of Sherman TX. For a complete depiction of the
       watch see the associated watch outline update (WOUS64 KWNS WOU2).
    
       PRECAUTIONARY/PREPAREDNESS ACTIONS...
    
       REMEMBER...A Tornado Watch means conditions are favorable for
       tornadoes and severe thunderstorms in and close to the watch
       area. Persons in these areas should be on the lookout for
       threatening weather conditions and listen for later statements
       and possible warnings.
    
       &&
    
       OTHER WATCH INFORMATION...CONTINUE...WW 40...WW 41...
    
       AVIATION...Tornadoes and a few severe thunderstorms with hail
       surface and aloft to 3 inches. Extreme turbulence and surface wind
       gusts to 60 knots. A few cumulonimbi with maximum tops to 450. Mean
       storm motion vector 24035.
    
       ...Gleason/Goss
    • Like 1
  11. Slight risk added for the 13th as of today, with a large expansion of the risk area + hatching added for the 14th. Below is the discussion for the latter

    SPC AC 120731
    
       Day 3 Convective Outlook  
       NWS Storm Prediction Center Norman OK
       0231 AM CDT Tue Mar 12 2024
    
       Valid 141200Z - 151200Z
    
       ...THERE IS A SLIGHT RISK OF SEVERE THUNDERSTORMS FROM THE MIDDLE
       MISSISSIPPI VALLEY INTO EASTERN OKLAHOMA...EAST TEXAS...AND THE
       LOWER MISSISSIPPI VALLEY...
    
       ...SUMMARY...
       Strong to severe thunderstorms are possible across a large area from
       the Middle Mississippi Valley into eastern Oklahoma, East Texas, and
       the Lower Mississippi Valley on Thursday.
    
       ...Synopsis...
       A surface low is forecast to be over the NE/IA/MO border vicinity
       early Thursday morning, with a cold front extending southwestward
       from this low across eastern KS and central OK into the TX Hill
       Country. An expansive warm sector is expected to be in place east of
       this cold front, from the Mid MS Valley into the southern Plains and
       Lower MS Valley early Thursday morning, supported by the previous
       days' return flow. Showers and thunderstorms may be ongoing in the
       vicinity of a warm front extending north-northeastward from the
       surface low, but much of the warm sector is currently expected to be
       free from any early period storms.
    
       This broad warm sector is expected to destabilize throughout the day
       with two primary corridors of severe thunderstorms potential, one
       near the surface low from southern IA/northern MO into west-central
       IL and another farther south from eastern OK and east TX into LA and
       AR.
    
       ...Southern IA/Northern MO/West-Central IL...
       Upper 50s dewpoints are expected south of the warm front throughout
       the period. Despite this somewhat modest low-level moisture,
       moderate to strong buoyancy is still anticipated early in the
       afternoon as surface temperatures climb into the low 70s, supported
       by cold mid-level temperatures and resulting steep mid-level lapse
       rates. Low-level convergence near the surface low and warm front
       will likely result in convective initiation amid vertical wind
       profiles that support supercells. There may be a tendency for storms
       to move north of the warm front over time, but enough residence in
       the warm sector is anticipated for some storms to reach maturity.
       Any mature supercells would be capable of all severe hazards,
       including tornadoes, strong gusts, and very large hail. 
    
       ...Eastern OK and East TX into LA and AR...
       Weak surface troughing will likely interact with an increasingly
       unstable airmass across the region during the afternoon, with
       convective initiation anticipated around 18Z across southeast OK and
       northeast TX. Given robust buoyancy and moderate vertical shear,
       initial development will likely be supercellular and capable of all
       severe hazards, including very large hail. How the convection
       evolves after the initial more discrete storms remains uncertain,
       with some potential for development into more linear structures
       given the front-parallel deep-layer vertical shear. If upscale
       growth is realized, the resulting convective line would then push
       eastward into AR and LA, with some potential for damaging gusts.
    
       ..Mosier.. 03/12/2024

    Screenshot_20240312_082350.jpg

    Screenshot_20240312_082429.jpg

    Screenshot_20240312_082520.jpg

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