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Mesoscale Discussion 495 |
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MESOSCALE DISCUSSION 0495
NWS STORM PREDICTION CENTER NORMAN OK
0401 PM CDT WED APR 30 2014
AREAS AFFECTED...FAR SWRN VA...CENTRAL AND ERN WV...AND FAR SWRN PA
CONCERNING...SEVERE POTENTIAL...WATCH UNLIKELY
VALID 302101Z - 302230Z
PROBABILITY OF WATCH ISSUANCE...5 PERCENT
SUMMARY...LOCALLY STRONG WIND GUSTS WILL BE POSSIBLE WITH TSTMS THAT
DEVELOP LATE THIS AFTERNOON FROM SWRN VA INTO CENTRAL WV AND FAR
SWRN PA.
DISCUSSION...SURFACE ANALYSIS AND RADAR IMAGERY SHOWED A BOUNDARY
EXTENDING SWD FROM SWRN PA THROUGH CENTRAL WV TO FAR SWRN VA...WITH
LOW-TOPPED CONVECTION BEGINNING TO DEVELOP NEAR THIS BOUNDARY /INVOF
GILMER COUNTY WV AND SWD TO RUSSELL COUNTY VA/. THIS CONVECTION IS
FORMING WHERE VISIBLE SATELLITE IMAGERY SHOWED A NARROW BREAK IN
CLOUDS FOR GREATER SURFACE HEATING. ALTHOUGH EFFECTIVE BULK SHEAR
IS SUPPORTIVE OF ORGANIZED STORMS...VERY WEAK INSTABILITY /MUCAPE
100-200 J PER KG/ IS EXPECTED TO LIMIT THE COVERAGE OF ANY STRONGER
LOW-TOPPED STORM DEVELOPMENT. STEEPER LOW-LEVEL LAPSE RATES SUGGEST
A STRONG WIND GUST OR TWO WILL BE POSSIBLE.
..PETERS/THOMPSON.. 04/30/2014
ATTN...WFO...RNK...PBZ...RLX...MRX...
LAT...LON 37068229 37928163 39298091 40298073 40458036 40018009
39128025 38228080 37358120 36748165 36588228 36708250
37068229
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