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Active Severe Weather Pattern Beginning Next Week


Jim Martin

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Pretty conservative, but it is day 3. Would anticipate a more strongly worded outlook with mentions of upgrade for the day 2 unless models begin down trending

A bit surprised by SPC's reluctancy to mention anything about strong tornadoes--not that it really matters in the grand scheme of things, but it is still nice to see-- for any of these days... The potential is obviously there, and there has already been a few.

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Outflow boundary in southern Kansas looks like the obvious play today. Hrrr likes the dryline in the Panhandle as well, while the 4km Nam suggest SW Oklahoma is a good play. Many options to choose from today!

Any thoughts on which ends up being the best?

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Outflow boundary in southern Kansas looks like the obvious play today. Hrrr likes the dryline in the Panhandle as well, while the 4km Nam suggest SW Oklahoma is a good play. Many options to choose from today!

Any thoughts on which ends up being the best?

 

OFB/Dryline intersection is what I'd personally play.

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Sitting near Buffalo just E of the 64/183 junction. Has the feel of a bigger day with already moderate ESE winds near this outflow boundary.

100% this. Juiced out there. We're hanging in WWR near where we stayed last night. Probably will head out to position in a few hours.
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Some conditional wording here, but I'm excited for tomorrow. Just gotta get some storms to break through the cap it sounds like...


   ...ERN KS INTO MO...   EARLY STORMS ARE FORECAST TO BE ONGOING FROM ERN KS INTO NRN MO   SUPPORTED BY WARM ADVECTION WITH DEWPOINTS NEAR 70 F SURGING NWD.   STRONG INSTABILITY IS FORECAST TO REDEVELOP UPSTREAM OF THE EARLY   ACTIVITY...WITH AN OUTFLOW BOUNDARY POSSIBLY PRESENT IN THE AREA   WHICH COULD SERVE AS A FOCUS FOR LATER DEVELOPMENT. IF THIS   OCCURS...LOW-LEVEL SHEAR WILL ALSO BE RELATIVELY FAVORABLE HERE FOR   SUPERCELLS AND A COUPLE TORNADOES. HOWEVER...THIS THREAT IS   CONDITIONAL GIVEN LACK OF ANY UPPER SUPPORT AFTER THE EARLY WAVE   MOVES THROUGH.
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I'm really surprised there isn't a 10% tornado risk out for OK and KS.  I wish I could get the latest graphics and discussion to load but ht network is just outrageously bad this week.  

Today is looking more impressive than I gave it credit for.  Shear still shows to be lacking on the latest GFS at 00Z and a bit more surface backing would be nice.   

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I'm really surprised there isn't a 10% tornado risk out for OK and KS.  I wish I could get the latest graphics and discussion to load but ht network is just outrageously bad this week.  

Today is looking more impressive than I gave it credit for.  Shear still shows to be lacking on the latest GFS at 00Z and a bit more surface backing would be nice.   

There is a 10% risk at the OK/KS border and also near Sterling, CO

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DDC VWP as of 1830Z shows impressive 0-3km low-level directional shear, currently on the "cool-side" of the boundary, which is likely where the highest tornado risk will reside today. Also along a SBCAPE gradient that, with ~3000J/KG SBCAPE @DDC as of 18Z. TONS of Vorticity along the OFB, and quite a bit of 0-3KM CAPE, along with low LCLs. Looks like a good recipe for tornadoes! 

post-7962-0-83216900-1464116122_thumb.pn

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A 'High' probability Tornado Watch for the Denver metro area is rare. That's what we have today.

URGENT - IMMEDIATE BROADCAST REQUESTED
TORNADO WATCH NUMBER 203
NWS STORM PREDICTION CENTER NORMAN OK
1240 PM MDT TUE MAY 24 2016

THE NWS STORM PREDICTION CENTER HAS ISSUED A

* TORNADO WATCH FOR PORTIONS OF
NORTHEAST COLORADO

* EFFECTIVE THIS TUESDAY AFTERNOON AND EVENING FROM 1240 PM UNTIL
800 PM MDT.

* PRIMARY THREATS INCLUDE...
A FEW TORNADOES LIKELY WITH A COUPLE INTENSE TORNADOES POSSIBLE
WIDESPREAD LARGE HAIL LIKELY WITH ISOLATED VERY LARGE HAIL
EVENTS TO 3 INCHES IN DIAMETER POSSIBLE
SCATTERED DAMAGING WIND GUSTS TO 70 MPH POSSIBLE

SUMMARY...THUNDERSTORMS WILL FORM SOON OVER THE FOOTHILLS NEAR
DENVER AND SPREAD EAST-NORTHEASTWARD THROUGH THE AFTERNOON AND EARLY
EVENING. PARAMETERS APPEAR FAVORABLE FOR SUPERCELLS CAPABLE OF VERY
LARGE HAIL AND A FEW TORNADOES.

THE TORNADO WATCH AREA IS APPROXIMATELY ALONG AND 50 STATUTE
MILES NORTH AND SOUTH OF A LINE FROM 30 MILES NORTH OF DENVER
COLORADO TO 55 MILES EAST NORTHEAST OF AKRON COLORADO. FOR A
COMPLETE DEPICTION OF THE WATCH SEE THE ASSOCIATED WATCH OUTLINE
UPDATE (WOUS64 KWNS WOU3).

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A 'High' probability Tornado Watch for the Denver metro area is rare. That's what we have today.

URGENT - IMMEDIATE BROADCAST REQUESTED

TORNADO WATCH NUMBER 203

NWS STORM PREDICTION CENTER NORMAN OK

1240 PM MDT TUE MAY 24 2016

THE NWS STORM PREDICTION CENTER HAS ISSUED A

* TORNADO WATCH FOR PORTIONS OF

NORTHEAST COLORADO

* EFFECTIVE THIS TUESDAY AFTERNOON AND EVENING FROM 1240 PM UNTIL

800 PM MDT.

* PRIMARY THREATS INCLUDE...

A FEW TORNADOES LIKELY WITH A COUPLE INTENSE TORNADOES POSSIBLE

WIDESPREAD LARGE HAIL LIKELY WITH ISOLATED VERY LARGE HAIL

EVENTS TO 3 INCHES IN DIAMETER POSSIBLE

SCATTERED DAMAGING WIND GUSTS TO 70 MPH POSSIBLE

SUMMARY...THUNDERSTORMS WILL FORM SOON OVER THE FOOTHILLS NEAR

DENVER AND SPREAD EAST-NORTHEASTWARD THROUGH THE AFTERNOON AND EARLY

EVENING. PARAMETERS APPEAR FAVORABLE FOR SUPERCELLS CAPABLE OF VERY

LARGE HAIL AND A FEW TORNADOES.

THE TORNADO WATCH AREA IS APPROXIMATELY ALONG AND 50 STATUTE

MILES NORTH AND SOUTH OF A LINE FROM 30 MILES NORTH OF DENVER

COLORADO TO 55 MILES EAST NORTHEAST OF AKRON COLORADO. FOR A

COMPLETE DEPICTION OF THE WATCH SEE THE ASSOCIATED WATCH OUTLINE

UPDATE (WOUS64 KWNS WOU3).

70/30 probs... Pretty solid. Expect that the watch in OK/KS later on will have even better probs.

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I was struck by the difference in "feel" to the air this morning, with DPs in the 20s yesterday but around 40 at sunrise today. I think this may be one of those situations where the Metro area might not get clobbered, but we may see impressive development just as the cells exit the most populated areas. DPs are in low 40s near I-25 but upper 40s-50 just 20 miles east. Winds are pretty brisk from the East though, so we may yet moisten more.

 

High prob of a tornado in the watch area, but the Metro area is at the far southwest corner. My bet would be Fort Morgan-Sterling for some fun.

 

I do not yet have the glass top on our patio table, so we won't get large hail but our neighbors might. :)

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Looks like AMA preliminarily rated the Turkey, TX tornado from last night as a low-end EF3, with estimated winds of 138mph. Was half-a-mile wide at times, and tracked about 7-8 miles. Was on the ground for quite a while though.

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The first larger cell of the day in Colorado, near Golden and Clear Creek Canyon, tracking toward Denver. Dual-pol radar already suggesting hail in this storm (not necessarily large hail)

 

Edit: 3 seconds after I posted this, there was a severe warning issued by BOU for half-dollar size hail. They are anticipating that the storm strengthens, which makes tons of sense.

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The first larger cell of the day in Colorado, near Golden and Clear Creek Canyon, tracking toward Denver. Dual-pol radar already suggesting hail in this storm (not necessarily large hail)

Went SVR warned... Possibly some rotation on the cell right now.

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mcd0706.gif

MESOSCALE DISCUSSION 0706
NWS STORM PREDICTION CENTER NORMAN OK
0231 PM CDT TUE MAY 24 2016

AREAS AFFECTED...SOUTHWEST KS TO EAST TX PANHANDLE/WEST OK

CONCERNING...SEVERE POTENTIAL...TORNADO WATCH LIKELY

VALID 241931Z - 242130Z

PROBABILITY OF WATCH ISSUANCE...95 PERCENT

SUMMARY...SCATTERED SUPERCELLS ARE EXPECTED TO DEVELOP ALONG THE
DRYLINE AND RESIDUAL OUTFLOW BOUNDARIES DURING THE LATE AFTERNOON TO
EARLY EVENING. VERY LARGE HAIL...A FEW TORNADIC STORMS...AND
ISOLATED SEVERE WINDS ARE LIKELY.

DISCUSSION...19Z SURFACE ANALYSIS PLACED A CYCLONE NEAR HAMILTON
COUNTY KS WITH A DRYLINE EXTENDING SOUTH THROUGH THE CENTRAL TX
PANHANDLE...A RESIDUAL OUTFLOW BOUNDARY ACROSS SOUTHWEST KS INTO
NORTH-CENTRAL KS AND ANOTHER CONFLUENT BOUNDARY THROUGH NORTHWEST
OK. THE WARM/MOIST SECTOR AIR MASS IS STRONGLY UNSTABLE WITH MLCAPE
OF 2500-3500 J/KG AMID UPPER 60S TO LOWER 70S SURFACE DEW POINTS.
HIGH-BASED CU HAS COMMENCED BEHIND THE DRYLINE IN THE TX PANHANDLE
AND STRENGTHENING CONVERGENCE ALONG THE BOUNDARY TIED TO THE
LEFT-EXIT REGION OF AN APPROACHING SUBTROPICAL UPPER JET SHOULD
RESULT IN STORM INITIATION BY 21Z. FARTHER NORTH....CLUMPING CU NEAR
THE CYCLONE SHOULD INITIATE INTO STORMS IN A SIMILAR TIME FRAME.

VERY STEEP MID-LEVEL LAPSE RATES OF 9 DEG C/KM FROM 700-500 MB AS
SAMPLED BY 19Z AMA RAOB WILL BE QUITE CONDUCIVE TO INTENSE UPDRAFT
ACCELERATION ONCE STORMS INITIATE.
AS SUCH...VERY LARGE HAIL SHOULD
BE THE PRIMARY INITIAL HAZARD. AS THE LOW-LEVEL JET STRENGTHENS THIS
EVENING...TORNADO/WIND POTENTIAL WILL LIKELY INCREASE TOWARDS 00Z.

..GRAMS/HART.. 05/24/2016

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