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June Severe Thread


downeastnc

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  • 2 weeks later...

Slight Risk for most of NC today outside of the mts and beaches......plenty of surface cape especially east, and the lapse rates etc look decent so we shall see what is what. Today looks capable of supporting more organized storms than the trash we have seen the last 3-4 days.

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CAE.........

 

.NEAR TERM /THROUGH TONIGHT/...
STRONG TO MODERATE INSTABILITY DEVELOPING EARLY THIS AFTERNOON WITH
LIFTED INDICES RANGING FROM MINUS 7C WEST TO MINUS 10C EAST AND
SURFACE BASES CAPES 2500 TO 4000 J/KG. ALREADY SEEING ENHANCED
CUMULUS CLOUDS AND SCATTERED CONVECTION DEVELOPING ACROSS THE EAST
MIDLAND AND LOW COUNTRY. SHORT WAVE ENERGY STILL TO CROSS THE
AREA THIS AFTERNOON/EVENING WITH PWAT 1.60 INCHES OR GREATER.

HIGH RESOLUTION MODELS SHOW CONVECTION DEVELOPING THIS AFTERNOON
DUE TO LARGE SCALE LIFT/UPPER LEVEL DIVERGENCE AND MODERATELY TO
STRONGLY UNSTABLE AIR MASS. SOME SUPPORT NOTED FROM SREF AND
MESOSCALE MODELS FOR NUMEROUS SHOWERS AND THUNDERSTORMS DURING THE
AFTERNOON AND EVENING. MODERATE INCREASE IN DEEP LAYER SHEAR AS
LONG WAVE TROUGH OVER THE EASTERN CONUS AMPLIFIES. WITH INCREASING
SHEAR COULD SEE A FEW SEVERE STORMS THIS AFTERNOON AND EVENING
WITH DAMAGING WINDS THE MAIN THREAT. KEPT CHANCE OF CONVECTION
NEAR 60 PERCENT. STILL EXPECT AFTERNOON HIGHS IN THE UPPER 80S TO
LOWER 90S AND LOWS TONIGHT IN THE LOWER 70S.

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Mesoscale Discussion 1264 < Previous MD         Next MD > mcd1264.gif

   MESOSCALE DISCUSSION 1264   NWS STORM PREDICTION CENTER NORMAN OK   1057 AM CDT THU JUN 27 2013   AREAS AFFECTED...PORTIONS AL...ERN MS...GA...SC...FL PANHANDLE.   CONCERNING...SEVERE POTENTIAL...WATCH POSSIBLE 
PROBABILITY OF WATCH ISSUANCE...40 PERCENT

SUMMARY...INCREASING SVR THREAT IS POSSIBLE ACROSS DISCUSSION AREA
AS LOW-LEVEL AIR MASS DESTABILIZES. LARGE HAIL AND DAMAGING
GUSTS...SOMETIMES NEAR SVR LIMITS...ARE POSSIBLE.

DISCUSSION...NEARLY UNCAPPED AND INCREASINGLY BUOYANT AIR MASS FROM
SC TO ERN MS WILL SUPPORT RISK FOR DEVELOPMENT OF SFC-BASED
CONVECTION THROUGH EARLY-MID AFTN PRODUCING LARGE HAIL AND DAMAGING
DOWNBURSTS. UPSCALE GROWTH IS POSSIBLE INTO LARGER CLUSTERS
OFFERING DAMAGING-WIND RISK.

VIS IMAGERY INDICATES TWO PRIMARY INITIAL AREAS OF CONVECTIVE
CONCERN...
1. NRN GA AND NERN AL....ALONG DIFFERENTIAL HEATING ZONE THAT
COINCIDES WITH SEWD EXTENSION OF EARLIER CONVECTION...SHIFTING
SEWD...AND
2. INVOF MCV THAT ALSO IS EVIDENT IN REFLECTIVITY ANIMATIONS OVER
SERN AL...NEAR AUO. THIS FEATURE WILL PROCEED TOWARD GULF COAST OF
CENTRAL FL PANHANDLE...AND MAY AID IN CONVECTIVE ORGANIZATION FROM
THAT REGION INTO SRN AL.
OTHER CONVECTION IS LIKELY TO DEVELOP ALONG MORE SUBTLE FEATURES
WITHIN NEARLY UNCAPPED AIR MASS FROM SC TO ERN MS.

MORE KINEMATIC AND DYNAMIC SUPPORT FOR ORGANIZED SVR
POTENTIAL...COMPARED TO PREVIOUS DAYS...IS EVIDENT THROUGH AT LEAST
EARLY-MID AFTN. COOLING ALOFT...MIDLEVEL WINDS AND DEEP SHEAR EACH
WERE ENHANCED IN BMX RAOB...I.E. 35-50 KT JETLET IN 450-600 MB LAYER
AND NEARLY -12 C 500-MB TEMP -- BY PROXIMAL PASSAGE OF MCV...WITHIN
SRN FRINGES OF SHORTWAVE TROUGH EXTENDING NNEWD OVER OH.
MEANWHILE...IN BROADER/MESO-ALPHA SCALE ENVIRONMENT...STRONGLY
DIFLUENT MID-UPPER LEVEL FLOW IS EVIDENT IN MORNING RAOB ANALYSES
AND MOISTURE CHANNEL IMAGERY...AHEAD OF TROUGH ALOFT. DCVA AND
ACCOMPANYING LARGE-SCALE ASCENT/DESTABILIZATION WILL ACT IN TANDEM
WITH STG INSOLATION OF MOIST BOUNDARY LAYER...CHARACTERIZED BY SFC
DEW POINTS 70S F AND TEMPS RISING INTO UPPER 80S/90S NEAR THERMAL
AXIS...YIELDING MLCAPE 2500-3500 J/KG IN MODIFIED RAOBS AND MODEL
SOUNDINGS. ENHANCEMENTS TO MIDLEVEL FLOW RELATED TO APCH OF
SHORTWAVE TROUGH ALSO WILL STRENGTHEN DEEP SHEAR. STORM MODE SHOULD
BE PRIMARILY MULTICELLULAR. HOWEVER...AT LEAST TRANSIENT
SUPERCELLULAR CHARACTER IS POSSIBLE...ESPECIALLY W AND SW OF MCV
WHERE STRONGEST FLOW ALOFT SHOULD PERSIST.

..EDWARDS/KERR.. 06/27/2013


ATTN...WFO...ILM...CHS...CAE...GSP...JAX...FFC...TAE...BMX...
MOB...MEG...JAN...
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The INTENSELY NOISY THUNDER ARGH line of storms that blew through here (a few miles N of KMSL) around 4am last night did a good bit of wind damage.

 

Summer in the South ... it was 90F by 11am and 96F now per KMSL, 98F per the parking lot thermometer, and we're feeling every degree, yuk. 

 

Meaning everyone is inside, in air conditioning, chugging water or very diluted ice tea, and talking about the heat.

 

If there is a single rumble of thunder from some pulse storm, half the shift charges outside to close the windows on their cars in the lot.  You'd think it was a fire drill or something, to look at the streams of people exiting from every door.

 

It's a good day :)

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Latest from RAH on facebook:

 

Still expecting strong to severe storms today in Central NC, mainly after 2 pm. Gusts over 50 mph possible - could knock down trees/branches. Those with outdoor plans late afternoon into evening, please keep a close eye on the sky & listen for any watches/warnings/alert statements.
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mcd1288.gif

 

MESOSCALE DISCUSSION 1288
   NWS STORM PREDICTION CENTER NORMAN OK
   1246 PM CDT FRI JUN 28 2013

   AREAS AFFECTED...SRN VA INTO WRN/CNTRL NC

   CONCERNING...SEVERE POTENTIAL...WATCH POSSIBLE

   VALID 281746Z - 281915Z

   PROBABILITY OF WATCH ISSUANCE...60 PERCENT

   SUMMARY...TSTMS ARE EXPECTED TO INCREASE IN COVERAGE AND INTENSITY
   THIS AFTERNOON WITH A RISK FOR DAMAGING WINDS AND SOME HAIL.  A WW
   IS POSSIBLE.

   DISCUSSION...LATEST TRENDS IN VISIBLE SATELLITE AND RADAR DATA
   INDICATE DEVELOPING TSTMS OVER THE HIGH TERRAIN OF FAR WRN VA AND
   ADDITIONAL DEEPENING CUMULUS SWD INTO WRN NC.  THE DOWNSTREAM AIR
   MASS E OF THE BLUE RIDGE IS RATHER MOIST WITH DEWPOINTS IN THE UPPER
   60S TO LOWER 70S.  AND WHILE MIDLEVEL LAPSE RATES ARE POOR...STRONG
   DAYTIME HEATING IS CONTRIBUTING TO A MODERATELY UNSTABLE ENVIRONMENT
   WITH MLCAPE VALUES OF AROUND 2000 J/KG. 

   HEATING ALONG THE HIGH TERRAIN AND CONVERGENCE ALONG A DEVELOPING
   LEE TROUGH ARE EXPECTED TO PROMOTE AN INCREASE IN STORM COVERAGE AND
   VIGOR THROUGH THE AFTERNOON.  THIS ACTIVITY WILL EVOLVE WITHIN A
   KINEMATIC ENVIRONMENT FEATURING A LARGELY UNIDIRECTIONAL WIND
   PROFILE WITH 35-40 KT FLOW IN THE 2-6-KM AGL LAYER /PER FCX AND MRX
   VAD DATA/.  AS SUCH...THE POTENTIAL WILL EXIST FOR UPSCALE STORM
   DEVELOPMENT INTO A FORWARD-PROPAGATING LINE WHICH IS IN GOOD
   AGREEMENT WITH RECENT CONVECTION-ALLOWING MODEL FORECASTS.  DAMAGING
   WINDS WOULD BE THE PRIMARY HAZARD SHOULD SUCH A SCENARIO UNFOLD.

 

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 256 PM EDT Fri Jun 28 2013


The National Weather Service has issued Severe Thunderstorm Watch
388 in effect until 10 PM EDT this evening for the following
areas

In North Carolina this watch includes 18 counties

In central North Carolina

Alamance              Chatham               Davidson            
Durham                Edgecombe             Forsyth             
Franklin              Granville             Guilford            
Halifax               Nash                  Orange              
person                Randolph              Vance               
wake                  Warren                Wilson              

This includes the cities of...Asheboro...Burlington...
Chapel HIll...Durham...Greensboro...Henderson...High Point...
Lexington...Louisburg...Nashville...Oxford...Pittsboro...
Raleigh...Roanoke Rapids...Rocky Mount...Roxboro...Warrenton...
Wilson and Winston-Salem.


 

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mcd1291.gif

MESOSCALE DISCUSSION 1291
NWS STORM PREDICTION CENTER NORMAN OK
0205 PM CDT FRI JUN 28 2013

AREAS AFFECTED...PORTIONS OF CNTRL/ERN GA...WRN SC

CONCERNING...SEVERE POTENTIAL...WATCH POSSIBLE

VALID 281905Z - 282130Z

PROBABILITY OF WATCH ISSUANCE...40 PERCENT

SUMMARY...A POTENTIAL FOR ISOLATED SEVERE THUNDERSTORMS WILL EXIST
THROUGH THE AFTERNOON HOURS...AND THE ISSUANCE OF A SEVERE
THUNDERSTORM WATCH IS POSSIBLE.

DISCUSSION...A WEAK OUTFLOW BOUNDARY ACCOMPANYING MORNING CONVECTION
HAS MOVED INTO NWRN AND W-CNTRL GA AND ARCS WSWWD INTO CNTRL/SRN AL.
THUNDERSTORM DEVELOPMENT HAS BEEN NOTED ACROSS PARTS OF W-CNTRL GA
INVOF THE BOUNDARY AND TO ITS EAST WITHIN A MOIST/LARGELY UNCAPPED
ENVIRONMENT. THIS ACTIVITY MAY HAVE A TENDENCY TO SPREAD EWD/SEWD
ACROSS PARTS OF CNTRL/ERN GA AND INTO WRN SC WHERE MLCAPE VALUES OF
1500-3000 J/KG EXIST OWING TO STRONG DIURNAL HEATING AMIDST A
RELATIVELY MOIST BOUNDARY LAYER. HOWEVER...GPS PW DATA INDICATE A
CORRIDOR OF RELATIVELY LOWER PW EXTENDING FROM THE CNTRL
APPALACHIANS INTO CNTRL GA -- PERHAPS ASSOCIATED WITH A POCKET OF
SUBSIDENT MID-LEVEL FLOW ON THE BACKSIDE OF AN ERN CONUS CYCLONE.
SFC OBS INDICATE DEWPOINTS MIXING OUT INTO THE MIDDLE 60S BENEATH
THIS LOWER-PW CORRIDOR...CONTRIBUTING TO RELATIVELY SMALLER MLCAPE
BUT LARGER SFC TEMPERATURE-DEWPOINT SPREADS. THE NET RESULT MAY BE
FOR ONLY SPORADIC PULSE CONVECTIVE COVERAGE AMIDST WEAK VERTICAL
SHEAR PER VWP DATA...THOUGH ISOLATED DMGG WIND GUSTS WILL BE
POSSIBLE. HOWEVER...SHOULD MULTIPLE COLD POOLS CONGEAL WITH
LOCALIZED AREAS OF UPSCALE CONVECTIVE GROWTH...A GREATER POTENTIAL
FOR DMGG WIND GUSTS MAY ENSUE...POTENTIALLY WARRANTING WW ISSUANCE.
AS SUCH...THE AREA WILL BE MONITORED FOR THE POSSIBLE ISSUANCE OF A
SEVERE THUNDERSTORM WATCH THROUGH THE AFTERNOON.

..COHEN/MEAD.. 06/28/2013


ATTN...WFO...CHS...CAE...GSP...FFC...

LAT...LON 33058440 34318418 34728277 34198157 33058178 32158273
32018349 32278408 33058440 
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