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2015 Severe Weather Thread


Hvward

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SPECIAL WEATHER STATEMENT
NATIONAL WEATHER SERVICE RALEIGH NC
552 PM EDT THU APR 30 2015
 
NCZ008-009-024>026-040-041-302245-
WAKE NC-VANCE NC-GRANVILLE NC-ORANGE NC-CHATHAM NC-DURHAM NC-
FRANKLIN NC-
552 PM EDT THU APR 30 2015

...A LINE OF THUNDERSTORMS WITH SMALL HAIL WILL AFFECT PORTIONS OF
WESTERN WAKE...SOUTHERN VANCE...SOUTHERN GRANVILLE...SOUTHERN
ORANGE...CENTRAL CHATHAM...DURHAM AND NORTHWESTERN FRANKLIN COUNTIES
UNTIL 645 PM EDT...

AT 549 PM EDT...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED A
LINE OF THUNDERSTORMS...LIKELY PRODUCING SMALL HAIL...ALONG A LINE
EXTENDING FROM NEAR BUTNER TO 8 MILES WEST OF PITTSBORO...AND MOVING
EAST AT 15 MPH.

PEA SIZE HAIL AND WIND GUSTS UP TO 35 MPH WILL BE POSSIBLE WITH
THESE STORMS.

LOCATIONS IMPACTED INCLUDE... DURHAM...CARY...CHAPEL
HILL...HENDERSON...CREEDMOOR...PITTSBORO...SILER
CITY...CARRBORO...JORDAN LAKE AND BUTNER.
 

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Headed East... we're in the target zone, maybe.

 

...A LINE OF THUNDERSTORMS PRODUCING SMALL HAIL WILL AFFECT  
PORTIONS OF WAKE...SOUTHEASTERN VANCE...WESTERN
CUMBERLAND...SOUTHWESTERN NASH...SOUTHEASTERN MOORE...HOKE...CENTRAL
JOHNSTON...FRANKLIN...SOUTHEASTERN LEE AND HARNETT COUNTIES UNTIL
800 PM EDT...

AT 700 PM EDT...TRAINED WEATHER SPOTTERS REPORTED A LINE OF  
THUNDERSTORMS PRODUCING SMALL ALONG A LINE EXTENDING FROM 6 MILES
EAST OF KITTRELL TO NEAR SOUTHERN PINES...AND MOVING SOUTHEAST AT 20
MPH.

THERE HAVE BEEN NUMEROUS REPORTS OF PEA SIZE HAIL WITH THESE STORMS.

LOCATIONS IMPACTED INCLUDE...
RALEIGH...FAYETTEVILLE...CARY...SOUTHERN PINES...SMITHFIELD...
RAEFORD...LOUISBURG...LILLINGTON...FORT BRAGG AND WAKE FOREST.
 

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  • 2 weeks later...

mcd0613.gif

 

 

MESOSCALE DISCUSSION 0613
NWS STORM PREDICTION CENTER NORMAN OK
0224 PM CDT MON MAY 11 2015

AREAS AFFECTED...PORTIONS OF ERN TN...WRN VA...FAR SRN
WV...WRN/CNTRL/SRN NC...SC...NERN GA

CONCERNING...SEVERE POTENTIAL...WATCH UNLIKELY

VALID 111924Z - 112200Z

PROBABILITY OF WATCH ISSUANCE...5 PERCENT

SUMMARY...ISOLATED TO SCATTERED THUNDERSTORMS WILL OCCUR ACROSS A
BROAD REGION FROM ERN TN AND WRN VA/FAR SRN WV TO PORTIONS OF
COASTAL SRN NC AND COASTAL SC.

DISCUSSION...THUNDERSTORMS ARE INCREASING IN NUMBER AND INTENSITY IN
ASSOCIATION WITH MULTIPLE REGIMES:

/1/ A COMPOSITE SEA-BREEZE/OUTFLOW BOUNDARY ADVANCING INLAND ACROSS
PARTS OF SC AND SRN NC...
/2/ TERRAIN-ENHANCED CIRCULATIONS OVER THE SRN APPALACHIANS...
/3/ BAROCLINIC CIRCULATIONS RELATED TO DIFFERENTIAL HEATING ACROSS A
CIRRUS CLOUD SHIELD EDGING INTO MIDDLE TN.

AIR THAT HAS NOT EXPERIENCED SUBSTANTIAL CONVECTIVE PROCESSING THUS
FAR HAS BECOME MODERATELY UNSTABLE WITH LITTLE MLCINH OWING TO
STRONG DIABATIC HEATING OF A RELATIVELY MOIST BOUNDARY LAYER
FEATURING SFC DEWPOINTS IN THE MIDDLE 60S. STEEP LOW-LEVEL LAPSE
RATES WILL ENHANCE THE RISK FOR DMGG WIND GUSTS...ESPECIALLY WHERE
COLD POOLS LOCALLY AMALGAMATE -- ESPECIALLY OVER CNTRL SC FROM LATER
GENERATIONS OF SEA-BREEZE CONVECTION. HOWEVER...WEAK DEEP SHEAR WILL
LIMIT CONVECTIVE ORGANIZATION AND THE OVERALL SVR RISK.

..COHEN/CORFIDI.. 05/11/2015


ATTN...WFO...RAH...ILM...RNK...CHS...RLX...CAE...GSP...MRX...
FFC...

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From WRAL:

 

11041114_827540073959719_839020943462175

 

 

 

As we noted yesterday, the approach of a cold front from the west today could trigger a band or two of hit & miss storms at times between early afternoon and early evening. While not all of us will see a storm, where they do form there is a slim chance they will produce locally damaging downburst winds, moderately large hail and frequent lightning.

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We are sitting on around 1000 SCAPE already and when the shear out west gets in here I suspect we see a bit more of a organized storm day and there will be more than just a few hit or miss severe storms....

 

Well, if it ends up being like it was in April, we'll have a lot of strong and severe storms around today when they say the chance is low, and then no storms at all when they say the chance is high.

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We're in a marginal risk area

 

day1otlk_1300.gif

 

...NC/SE VA...
   WIDELY SCATTERED TO SCATTERED TSTMS SHOULD DEVELOP TODAY NEAR
   PREFRONTAL TROUGH AND SEA-BREEZE BOUNDARIES...WITH DAMAGING GUSTS
   AND ISOLATED LARGE HAIL POSSIBLE.  SRN PERIPHERY OF HEIGHT FALLS AND
   TIGHTENING MID-UPPER HEIGHT/FLOW GRADIENT ASSOCIATED WITH GREAT
   LAKES TROUGH WILL BRUSH THIS REGION TODAY...WHILE DIABATIC SFC
   HEATING OF RICHLY MOIST BOUNDARY LAYER OCCURS...ALL IN WEAKLY CAPPED
   THERMODYNAMIC PROFILES.  IR/EARLY VIS IMAGERY INDICATE SUFFICIENT
   LACK OF CLOUD COVER TO SUPPORT STG SFC HEATING TODAY.  SFC DEW
   POINTS UPPER 60S TO LOWER 70S F SHOULD CONTRIBUTE TO MLCAPE
   1500-2500 J/KG ATOP INCREASINGLY WELL-MIXED SUBCLOUD LAYER.  WEAK
   BOUNDARY-LAYER WINDS WITH SOME WLY COMPONENT WILL LIMIT CONVERGENCE
   AND LOW-LEVEL SHEAR.  HOWEVER...PRESENCE OF LARGE BUOYANCY...AND
   FAVORABLE LOW-LEVEL LAPSE RATES...AND 30-35 KT EFFECTIVE-SHEAR
   MAGNITUDES...INDICATE POTENTIAL FOR SOME ORGANIZED MULTICELLS AND
   PERHAPS TRANSIENT/MESSY SUPERCELL MODE.

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10:35AM AFD

 

THE BEST INSTABILITY...MUCAPE IN EXCESS OF 2000 J/KG...WILL BE
MAINLY EAST OF THE TRIANGLE DURING THE AFT/EVE. THOUGH THE STEEPEST
LAPSE RATES WILL BE JUST WEST OF THE BEST INSTABILITY...THEY WILL
STILL BE FAIRLY STEEP ACROSS THE EAST. FORCING FOR ASCENT WILL BE
LIMITED TO LOW-LEVEL CONVERGENCE ALONG THE FRONT...PRE-FRONTAL
TROUGH...AND MESOSCALE FEATURES SUCH AS THE SEABREEZE DUE TO THE
LACK OF UPPER LEVEL FORCING. THE ADVECTION OF A DRIER LOW-LEVEL
AIRMASS INTO THE STATE FROM THE WEST DURING PEAK HEATING/MIXING WILL
RESULT IN RAPID LOW-LEVEL DRYING AND A TREND OF DECREASING
INSTABILITY ACROSS THE WESTERN PIEDMONT THIS AFTERNOON..THUS EXPECT
LOWEST CHANCES OF ANY SHOWERS OR STORMS THERE. THE BEST CHANCE FOR
SEVERE WEATHER WILL BE GENERALLY ACROSS THE EASTERN HALF OF THE
AREA...EAST OF THE TRIANGLE (SEE SEVERE WX SECTION BELOW). THE FRONT
SHOULD MOVE THROUGH THE AREA FAIRLY QUICKLY...BY 06Z WEDNESDAY...
WITH DRY WEATHER AND CLEARING BEHIND IT. OVERNIGHT LOWS IN THE LOW
50S NW TO LOW 60S SE. -RAH

SEVERE WX: CONVECTIVE POTENTIAL THIS AFTERNOON IS ILL-DEFINED GIVEN
A LACK OF UPPER LEVEL FORCING...RELATIVELY WEAK 0-6 KM SHEAR (ON THE
ORDER OF 20-25 KT) AND THE GRADUAL ADVECTION OF A DRIER /MORE
STABLE/AIRMASS FROM WEST-EAST ACROSS CENTRAL NC THIS AFTERNOON.
GIVEN MODERATE DESTABILIZATION AND A VERY HIGH EQUILIBRIUM LEVEL...
EFFECTIVE SHEAR VALUES COULD BE SOMEWHAT MORE FAVORABLE (30-35 KT)
IN THE PRESENCE OF ROBUST UPDRAFTS SPANNING A GREATER VERTICAL DEPTH
(0-8 KM LAYER)...HOWEVER...UPDRAFTS OF THIS MAGNITUDE WILL
INCREASINGLY BE CONFINED TO EASTERN PORTIONS OF THE STATE AS THE
AFOREMENTIONED DRYING OCCURS. WITH THE ABOVE IN MIND...EXPECT AN
ISOLD POTENTIAL FOR SVR WIND/HAIL...PRIMARILY SOUTH AND EAST OF THE
TRIANGLE. -VINCENT

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