Jump to content
  • Member Statistics

    17,507
    Total Members
    7,904
    Most Online
    SnowHabit
    Newest Member
    SnowHabit
    Joined

2015 Severe Weather Thread


Hvward

Recommended Posts

  • Replies 1.5k
  • Created
  • Last Reply

Lots of wind on Tuesday

We must have had a more wind than I thought lastnight. The nearest trees to me are a couple hundred yards away. It's hard to judge the wind at night in those trees. When I went out this morning there were several large branches down just down the road from me.

Link to comment
Share on other sites

PUBLIC INFORMATION STATEMENT

NATIONAL WEATHER SERVICE WILMINGTON NC

647 PM EDT THU JUL 23 2015

 

...MICROBURST /STRAIGHT LINE WIND DAMAGE/ CONFIRMED NEAR

WILMINGTON IN NEW HANOVER COUNTY NORTH CAROLINA...

 

LOCATION...WILMINGTON IN NEW HANOVER COUNTY NORTH CAROLINA

Link to comment
Share on other sites

  • 2 months later...

Updated HWO from RAH...

.DAYS TWO THROUGH SEVEN...WEDNESDAY THROUGH MONDAY.THERE IS THE POTENTIAL FOR A FEW STRONG TO LOCALLY SEVERETHUNDERSTORMS WEDNESDAY AND WEDNESDAY EVENING OVER MOST OF CENTRALNC. THE MAIN SEVERE WEATHER THREAT WILL BE DAMAGING STRAIGHT LINEWINDS ASSOCIATED WITH BANDS OF THUNDERSTORMS. AN ISOLATED TORNADOCANNOT BE RULED OUT. THE MAIN LIMITING FACTOR FOR THE DEVELOPMENTOF SEVERE STORMS WILL BE THE LACK OF LOW LEVEL INSTABILITY.
Link to comment
Share on other sites

From the afternoon AFD

THE STRENGTHENING FLOW WILL INCREASE THE 0-6KM BULK SHEAR INTO THE35-45KT RANGE. THIS AMOUNT OF SHEAR COUPLED WITH THE VEERING LOWLEVEL FLOW (RESIDUAL EFFECT OF THE CAD AIR MASS IN THE PIEDMONT)SUGGEST LOW LEVEL HELICITY VALUES NEAR THE FAVORABLE PARAMETERS FORROTATING CELLS. HOWEVER... THE LOWER HALF OF THE ATMOSPHERE MAY NOTBE BUOYANT ENOUGH TO GENERATE STORMS OF SUFFICIENT DEPTH AS LOWLEVEL INSTABILITY APPEARS TO BE LACKING. THAT BEING SAID...THE MODELTREND HAS BEEN TO INCREASE THE INSTABILITY WITH EACH SUCCESSIVE RUNSUCH THAT THE 12Z GFS MUCAPE VALUES REACH 1200-1400 J/KG OVERPORTIONS OF THE PIEDMONT AND COASTAL PLAIN WEDNESDAY AFTERNOON ANDMLCAPE 400-600J/KG. IF THE MODEL TREND CONTINUES AND IF PEEKS OF SUNOCCUR LATE WEDNESDAY MORNING-AFTERNOON NEAR OR ADJACENT TO OURREGION...ESPECIALLY SOUTH OF OUR AREA...THEN THE THREAT FOR SEVERESTORMS WILL INCREASE. 
Link to comment
Share on other sites

 

From the afternoon AFD

THE STRENGTHENING FLOW WILL INCREASE THE 0-6KM BULK SHEAR INTO THE35-45KT RANGE. THIS AMOUNT OF SHEAR COUPLED WITH THE VEERING LOWLEVEL FLOW (RESIDUAL EFFECT OF THE CAD AIR MASS IN THE PIEDMONT)SUGGEST LOW LEVEL HELICITY VALUES NEAR THE FAVORABLE PARAMETERS FORROTATING CELLS. HOWEVER... THE LOWER HALF OF THE ATMOSPHERE MAY NOTBE BUOYANT ENOUGH TO GENERATE STORMS OF SUFFICIENT DEPTH AS LOWLEVEL INSTABILITY APPEARS TO BE LACKING. THAT BEING SAID...THE MODELTREND HAS BEEN TO INCREASE THE INSTABILITY WITH EACH SUCCESSIVE RUNSUCH THAT THE 12Z GFS MUCAPE VALUES REACH 1200-1400 J/KG OVERPORTIONS OF THE PIEDMONT AND COASTAL PLAIN WEDNESDAY AFTERNOON ANDMLCAPE 400-600J/KG. IF THE MODEL TREND CONTINUES AND IF PEEKS OF SUNOCCUR LATE WEDNESDAY MORNING-AFTERNOON NEAR OR ADJACENT TO OURREGION...ESPECIALLY SOUTH OF OUR AREA...THEN THE THREAT FOR SEVERESTORMS WILL INCREASE. 

 

That's more than enough cape in high shear setups to make things scary and even low top supercells will be producing the upside is they are generally short lived and weak tornados....but if the updrafts can grow tall enough then something more serious could happen and thats why late Oct and especially Nov are when we have our secondary peaks in tornados for NC....plenty of deadly strong tornadoes in the record in NC this time of year.

Link to comment
Share on other sites

MHX says this

 

A POTENT UPR
TROUGH WILL APPROACH THE SE CONUS FROM THE MS RIVER VALLEY. THIS
SYSTEM WILL PROVIDE THE UPR SUPPORT FOR SCT TO NUMEROUS SHOWERS
TODAY...AND WITH DEEPENING SOUTHERLY LOW LEVEL FLOW...RICH
ATLANTIC MOISTURE WILL OVERSPREAD E NC WITH TD`S CONTINUING TO
CLIMB THROUGH THE 60S TO AROUND 70. INGREDIENTS ARE COMING
TOGETHER TO PRODUCE A MARGINAL SEVERE THREAT THIS AFTERNOON. NCAR
ENSEMBLE SFC BASED CAPE VALS INDICATE 1000-1500 J/KG DEVELOPING BY
THIS AFTERNOON. 0-3 KM HELICITIES WILL BE IN THE 200 M2/S2 RANGE
TODAY...WITH MUCH OF THIS IN THE LOWEST 1KM. THE LOW LEVEL SHEAR
WILL BE REALIZED BY THE LOW LCL`S FCST. THIS COMBINATION OF
FACTORS WILL PRODUCE A THREAT FOR ISOLATED TORNADOES...MAINLY THIS
AFTERNOON IN CONJUNCTION WITH THE DEVELOPING INSTABILITY.

-- End Changed Discussion --

 

 

And SPC hints at possible upgrade to slight risk later today for Carolinas

 

A DIURNALLY MAXIMIZED
   CORRIDOR OF MOISTURE/BUOYANCY SHOULD DEVELOP ACROSS PARTS OF THE
   CAROLINAS AND POSSIBLY VA THROUGH AFTERNOON/EARLY EVENING...ALTHOUGH
   MID-LEVEL LAPSE RATES WILL GENERALLY REMAIN WEAK AND POTENTIALLY
   TEMPER UPDRAFT STRENGTH. STRONG/SEVERE THUNDERSTORM DEVELOPMENT
   ACROSS THIS REGION WOULD BE AIDED BY THE SYNOPSIS-DESCRIBED LEAD
   SHORTWAVE TROUGH AND RELATED INCREASINGLY FORCING FOR
   ASCENT/VERTICAL SHEAR...WITH A CONDITIONAL RISK FOR A FEW
   SUPERCELLS/FAST-MOVING LINE SEGMENTS CAPABLE OF WIND DAMAGE AND A
   TORNADO RISK. PORTIONS OF THE REGION COULD WARRANT A CATEGORICAL
   UPGRADE TO SLIGHT RISK IN SUBSEQUENT OUTLOOKS.



 

Link to comment
Share on other sites

THIS HAZARDOUS WEATHER OUTLOOK IS FOR CENTRAL NORTH CAROLINA.

.DAY ONE...TODAY AND TONIGHT.

NUMEROUS SHOWERS AND ISOLATED THUNDERSTORMS WILL OVERSPREAD
CENTRAL NC FROM MID-MORNING THROUGH EARLY THIS AFTERNOON...THE
STRONGEST OF WHICH WILL BE CAPABLE OF PRODUCING STRONG TO
DAMAGING WIND GUSTS...OR AN ISOLATED TORNADO. AN ADDITIONAL BAND
OR TWO OF SHOWERS AND STORMS WILL DEVELOP OVER THE WESTERN
CAROLINAS LATER TODAY...THEN MOVE EAST ACROSS CENTRAL NC LATE THIS
AFTERNOON AND THIS EVENING. THESE STORMS WILL ALSO BE CAPABLE OF
PRODUCING DAMAGING WINDS OR AN ISOLATED TORNADO.

Link to comment
Share on other sites


1110 AM EDT WED OCT 28 2015

THIS HAZARDOUS WEATHER OUTLOOK IS FOR CENTRAL NORTH CAROLINA.

.DAY ONE...THIS AFTERNOON AND TONIGHT.

SEVERAL BANDS OF SHOWERS AND ISOLATED THUNDERSTORMS WILL CROSS

CENTRAL NC THIS AFTERNOON AND TONIGHT. A FEW STORMS MAY BECOME

LOCALLY STRONG OR SEVERE WITH THE MAIN WEATHER HAZARD BEING

DAMAGING WIND GUSTS. AN ISOLATED TORNADO CANNOT BE RULED OUT. THE

TORNADO RISK EXISTS BASICALLY ALONG AND EAST OF HIGHWAY 1.

THE RISK FOR A STRONG OR SEVERE THUNDERSTORM WILL DIMINISH IN THE

WEST BY 9 PM...AND IN THE COASTAL PLAIN BY MIDNIGHT.

Link to comment
Share on other sites


AS OF 315 PM WEDNESDAY...

ATMOSPHERE HAS BECOME MARGINALLY UNSTABLE THIS AFTERNOON WITH SFC

BASED CAPE VALUES RANGING FROM 1000-1500 J/KG...HIGHEST IN THE

NORTHERN COASTAL PLAIN. THIS REGION ALSO WHERE EFFECTIVE BULK SHEAR

(40-45KTS) AND STORM RELATIVE HELICITY (200 M2/S2) ARE MAXIMIZED.

MID LEVEL SHEAR AXIS LIFTING NEWD ACROSS THE PIEDMONT PRECEDED BY A

BAND OF SHOWERS LIFTING INTO THE NORTHERN COASTAL PLAIN AT 1830Z.

POTENTIAL EXISTS FOR A STRONG GUST OF WINDS WITH THE HEAVIER SHOWERS

AS THEY PROGRESS QUICKLY TO THE NE.

FOCUS WILL SHIFT WEST-SW AFTER 21Z AS NEXT S/W TROUGH ROTATING

THROUGH THE BASE OF THE L/W TROUGH BEGINS TO LIFT NEWD ALONG THE

SPINE OF THE APPALACHIANS. THIS FEATURE WILL BE AIDED BY A 300JET

LIFTING NEWD ACROSS THE TN VALLEY...MODESTLY INCREASING UPPER

DIVERGENCE IN OUR VICINITY. WHILE MID LEVEL LAPSE RATES ANEMIC...THE

MODEST LIFT PROVIDED BY THE S/W INTERACTING WITH AVAILABLE LOW LEVEL

MOISTURE/INSTABILITY SHOULD GENERATE A BAND OF SHOWERS AND ISOLATED

THUNDERSTORMS. CAM RADAR PRESENTATIONS SUGGEST BAND OF BROKEN

CONVECTION WORKING ITS WAY INTO THE WESTERN PIEDMONT IN THE 23Z-02Z

TIME FRAME THEN ADVANCING EAST IN THE EASTERN PIEDMONT-SANDHILLS

BETWEEN 03Z-06Z...DISSIPATING OR WELL NE OF OUR REGION THEREAFTER.

IF TIMING IS VERIFIED...CONVECTION WILL CROSS CENTRAL NC AFTER PRIME

HEATING AND WHEN THE LOWER ATMOSPHERE COMMENCES ITS NOCTURNAL

STABILIZATION. THUS... WHAT MEAGER INSTABILITY AVAILABLE EARLY THIS

EVENING WILL LIKELY BE FURTHER DIMINISHED ONCE BETTER DYNAMICS

ARRIVE LATER THIS EVENING.

THUS...WHILE THERE IS A NON-ZERO THREAT FOR A SEVERE STORM OR TWO

THIS EVENING...BELIEVE BULK OF CONVECTION WILL CONSIST NOTHING MORE

THAN BRIEF HEAVY RAIN AND SPORADIC WIND GUSTS 35-40KTS. WITH THE LOW

LEVEL JET CONTINUING TO PULL AWAY FRO OUR REGION THIS

EVENING...THREAT FOR DAMAGING WIND GUSTS WILL ALSO DIMINISH TO NEAR

ZERO BY 03Z.

SFC TROUGH WILL CROSS CENTRAL NC 06-12Z WITH PARTIAL CLEARING

OCCURRING SHORTLY THEREAFTER AS WEST-SW FLOW ADVECTS A DRIER AIR

MASS. THE PARTIAL CLEARING WILL LEAD TO THE DEVELOPMENT OF LOW

STRATUS AND/OR FOG WITH THE POTENTIAL FOR LOCALLY DENSE FOG. THE

THREAT FOR FOG APPEARS HIGHEST OVER THE SOUTHERN PIEDMONT INTO THE

SANDHILLS. MIN TEMPS MID-UPPER 50S NW TO THE LOWER 60S EAST-SE.

Link to comment
Share on other sites

Yeah, they're issuing statements (Heavy rain, winds gusting to 40)  on that line now that it's congealed into something more defined. It appears to be 2½-3 hours out from the Triangle area at current forward motion. We had some good clearing out right before sunset...that may enhance the activity - or it could be a non-factor given the time of day.

Link to comment
Share on other sites


...A LINE OF STRONG THUNDERSTORMS WILL AFFECT PORTIONS OF

JOHNSTON...CUMBERLAND...WAYNE...HARNETT AND SAMPSON COUNTIES UNTIL

915 PM EDT...

AT 829 PM EDT...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED A

LINE OF STRONG THUNDERSTORMS ALONG A LINE EXTENDING FROM LILLINGTON

TO 8 MILES SOUTHWEST OF FAYETTEVILLE...AND MOVING NORTHEAST AT 25

MPH.

WIND GUSTS UP TO 40 MPH WILL BE POSSIBLE WITH THESE STORMS.

LOCATIONS IMPACTED INCLUDE...

FAYETTEVILLE...GOLDSBORO...SMITHFIELD...CLINTON...LILLINGTON...FORT

BRAGG...CLAYTON...DUNN...MOUNT OLIVE AND ANGIER.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

LOCALLY HEAVY RAIN WILL QUICKLY REDUCE VISIBILITY AND RESULT IN

PONDING OF WATER ON ROADWAYS. DRIVERS ARE URGED TO SLOW DOWN AND USE

EXTRA CAUTION TO AVOID HYDROPLANING.

THESE STORMS MAY INTENSIFY...SO BE CERTAIN TO MONITOR LOCAL RADIO AND

TV STATIONS...AS WELL AS LOCAL CABLE TV OUTLETS...FOR ADDITIONAL

INFORMATION AND POSSIBLE WARNINGS FROM THE NATIONAL WEATHER SERVICE.

Link to comment
Share on other sites

Archived

This topic is now archived and is closed to further replies.

  • Recently Browsing   0 members

    • No registered users viewing this page.

×
×
  • Create New...