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July 13-15 storm risk


Kmlwx

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MESOSCALE DISCUSSION 1388
NWS STORM PREDICTION CENTER NORMAN OK
1223 PM CDT TUE JUL 15 2014

AREAS AFFECTED...NEW YORK CITY...NJ...DE...FAR SE PA...MD...ERN
VA...NE NC

CONCERNING...SEVERE POTENTIAL...WATCH LIKELY

VALID 151723Z - 151900Z

PROBABILITY OF WATCH ISSUANCE...80 PERCENT

SUMMARY...A SEVERE THREAT IS EXPECTED TO DEVELOP FROM NE NC
EXTENDING NEWD ACROSS THE MID-ATLANTIC TO THE VICINITY OF NEW YORK
CITY THIS AFTERNOON. WIND DAMAGE AND ISOLATED LARGE HAIL SHOULD BE
THE PRIMARY THREATS. WW ISSUANCE APPEARS LIKELY ACROSS THE REGION
WITHIN THE NEXT HOUR.

DISCUSSION...THE LATEST SFC ANALYSIS SHOWS A COLD FRONT IN THE SRN
AND CNTRL APPALACHIAN MTNS WITH A PRE-FRONTAL TROUGH EXTENDING FROM
SRN PA SWD INTO VA AND NRN NC. SFC DEWPOINTS ALONG THE TROUGH ARE IN
THE UPPER 60S AND LOWER 70S F AND THIS HAS CONTRIBUTED TO THE
DEVELOPMENT OF MODERATE INSTABILITY. RAP MESOANALYSIS DATA IS
SUGGESTING THAT TWO POCKETS OF MODERATE INSTABILITY EXIST. THE FIRST
IS LOCATED IN SRN NJ WITH THE SECOND OVER SERN VA AND NERN NC WHERE
MLCAPE VALUES ARE ESTIMATED IN THE 2000 TO 3500 J/KG RANGE.
CONCERNING THE SHEAR ENVIRONMENT...WSR-88D VWPS FROM WASHINGTON DC
NNEWD ALONG THE COAST TO NEAR NEWARK NJ SHOW UNIDIRECTIONAL WIND
PROFILES WITH 40 KT OF FLOW IN THE 3 TO 5 KM LAYER. THIS IS CREATING
MODERATE DEEP LAYER SHEAR WHICH ALONG WITH THE INSTABILITY SHOULD BE
FAVORABLE FOR ISOLATED SUPERCELLS AND ORGANIZED MULTICELLS. ANY
SUPERCELL THAT CAN DEVELOP SHOULD HAVE POTENTIAL FOR WIND DAMAGE AND
ISOLATED LARGE HAIL. SHORT BOWING LINE SEGMENTS WILL ALSO HAVE A
WIND DAMAGE THREAT. THE WIND DAMAGE POTENTIAL COULD BECOME MORE
SUBSTANTIAL IF CELLS CAN CONGEAL INTO A LARGER LINE SEGMENTS WITH A
COLD POOL ORGANIZING.

..BROYLES/HART.. 07/15/2014

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977  
WWUS30 KWNS 151741  
SAW3  
SPC AWW 151741  
WW 423 SEVERE TSTM CT DC DE MD NC NJ NY PA VA WV CW 151745Z - 160100Z  
AXIS..75 STATUTE MILES EAST AND WEST OF LINE..  
40NW BDR/BRIDGEPORT CT/ - 25WSW AVC/SOUTH HILL VA/  
..AVIATION COORDS.. 65NM E/W /49WSW BDL - 44NNE RDU/  
HAIL SURFACE AND ALOFT..1.5 INCHES. WIND GUSTS..60 KNOTS.  
MAX TOPS TO 500. MEAN STORM MOTION VECTOR 24030.  
 
LAT...LON 41567223 36547712 36547981 41567512

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