WATCHES: Severe Thunderstorm Watch Number 199

WWUS20 KWNS 211734
SEL9
SPC WW 211734
INZ000-220100-

URGENT - IMMEDIATE BROADCAST REQUESTED
SEVERE THUNDERSTORM WATCH NUMBER 199
NWS STORM PREDICTION CENTER NORMAN OK
135 PM EDT FRI MAY 21 2010

THE NWS STORM PREDICTION CENTER HAS ISSUED A
SEVERE THUNDERSTORM WATCH FOR PORTIONS OF

MUCH OF INDIANA

EFFECTIVE THIS FRIDAY AFTERNOON AND EVENING FROM 135 PM UNTIL 900
PM EDT.

HAIL TO 1.5 INCHES IN DIAMETER...THUNDERSTORM WIND GUSTS TO 70
MPH...AND DANGEROUS LIGHTNING ARE POSSIBLE IN THESE AREAS.

THE SEVERE THUNDERSTORM WATCH AREA IS APPROXIMATELY ALONG AND 55
STATUTE MILES EAST AND WEST OF A LINE FROM 20 MILES EAST
NORTHEAST OF SOUTH BEND INDIANA TO 30 MILES SOUTH OF BLOOMINGTON
INDIANA. FOR A COMPLETE DEPICTION OF THE WATCH SEE THE
ASSOCIATED WATCH OUTLINE UPDATE (WOUS64 KWNS WOU9).

REMEMBER...A SEVERE THUNDERSTORM WATCH MEANS CONDITIONS ARE
FAVORABLE FOR SEVERE THUNDERSTORMS IN AND CLOSE TO THE WATCH
AREA. PERSONS IN THESE AREAS SHOULD BE ON THE LOOKOUT FOR
THREATENING WEATHER CONDITIONS AND LISTEN FOR LATER STATEMENTS
AND POSSIBLE WARNINGS. SEVERE THUNDERSTORMS CAN AND OCCASIONALLY
DO PRODUCE TORNADOES.

OTHER WATCH INFORMATION...CONTINUE...WW 198...

DISCUSSION...TSTMS ARE EXPECTED TO INCREASE IN COVERAGE AND
INTENSITY THIS AFTERNOON AHEAD OF COMPACT MIDLEVEL TROUGH AND
ASSOCIATED SURFACE FRONT. WHILE CLOUDINESS HAS LIMITED DIABATIC
HEATING...BOUNDARY LAYER DEW POINTS IN THE 60S AND COOLING ALOFT
WILL CONTRIBUTE TO MLCAPE OF AROUND 1000 J/KG. THIS INSTABILITY IN
CONJUNCTION WITH VEERING WIND PROFILES WITH HEIGHT AND 30-35 KT OF
DEEP-LAYER SHEAR WILL BE SUPPORTIVE OF ORGANIZED/ROTATING STORMS
CAPABLE OF MAINLY HAIL AND LOCALLY DAMAGING WIND GUSTS.

AVIATION...A FEW SEVERE THUNDERSTORMS WITH HAIL SURFACE AND ALOFT
TO 1.5 INCHES. EXTREME TURBULENCE AND SURFACE WIND GUSTS TO 60
KNOTS. A FEW CUMULONIMBI WITH MAXIMUM TOPS TO 500. MEAN STORM
MOTION VECTOR 27025.

...MEAD

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