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MESOSCALE DISCUSSION 0903
NWS STORM PREDICTION CENTER NORMAN OK
0853 PM CDT SAT MAY 30 2009
AREAS AFFECTED...ERN IL/CENTRAL AND SRN IND/SRN OH/NRN KY/WV
CONCERNING...SEVERE THUNDERSTORM WATCH 316...317...
VALID 310153Z - 310300Z
THE SEVERE WEATHER THREAT FOR SEVERE THUNDERSTORM WATCH
316...317...CONTINUES.
ASCENT WITHIN EXIT REGION OF 50 KT WNWLY MID LEVEL JET SPREADING
INTO THE OH VALLEY COMBINED WITH MODERATE INSTABILITY...ESPECIALLY
ACROSS THE LOWER OH VALLEY...AND STRONG DEEP LAYER SHEAR WILL
MAINTAIN LIKELIHOOD FOR ADDITIONAL ORGANIZED STORMS.
REGIONAL RADARS/LIGHTNING DATA INDICATED MORE PERSISTENT TSTM
ACTIVITY REMAINS LOCATED NEAR THE SURFACE LOW...NOW MOVING ESEWD
INTO CENTRAL IND...AND SEWD IN THE VICINITY OF THE SURFACE FRONT
EXTENDING THROUGH SWRN OH TO CENTRAL/SRN WV. 30-40 KT WSWLY LOW
LEVEL JET EXTENDING FROM SERN MO INTO SRN OH/KY WILL CONTINUE TO
MAINTAIN INFLOW OF MOIST/MODERATELY UNSTABLE AIR MASS INTO ONGOING
STORMS FROM CENTRAL IND TO SRN OH/NERN KY/WV. ADDITIONAL STORMS
HAVE ALSO RECENTLY INCREASED ACROSS SWRN IND/ADJACENT KY.
ALTHOUGH LOW LEVEL DIRECTIONAL SHEAR...ESPECIALLY IN THE VICINITY OF
THE FRONT EXTENDING SEWD FROM THE IND SURFACE LOW...HAS SUPPORTED
LOW LEVEL STORM ROTATION...INCREASING SURFACE BASED INHIBITION
SHOULD TEND TO LESSEN THE TORNADO THREAT. HAIL AND STRONG WIND
GUSTS WILL CONTINUE TO BE POSSIBLE WITH THE STRONGEST ACTIVITY THIS
EVENING.
..PETERS.. 05/31/2009
ATTN...WFO...RNK...RLX...MRX...JKL...ILN...LMK...IWX...IND...
PAH...ILX...LSX...
LAT...LON 38348978 39158959 39998803 40618664 40438503 40078404
39658288 39368159 38578055 37848058 37408130 36998219
37608502 38068724 38348978
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