WATCHES: Severe Thunderstorm Watch Number 118

WWUS20 KWNS 301927
SEL8
SPC WW 301927
INZ000-OHZ000-310300-

URGENT - IMMEDIATE BROADCAST REQUESTED
SEVERE THUNDERSTORM WATCH NUMBER 118
NWS STORM PREDICTION CENTER NORMAN OK
325 PM EDT FRI MAR 30 2012

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

INDIANA
WESTERN OHIO

EFFECTIVE THIS FRIDAY AFTERNOON AND EVENING FROM 325 PM UNTIL
1100 PM EDT.

HAIL TO 2 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 65
STATUTE MILES NORTH AND SOUTH OF A LINE FROM 25 MILES SOUTHEAST
OF MANSFIELD OHIO TO 15 MILES WEST SOUTHWEST OF TERRE HAUTE
INDIANA. FOR A COMPLETE DEPICTION OF THE WATCH SEE THE
ASSOCIATED WATCH OUTLINE UPDATE (WOUS64 KWNS WOU8).

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.

DISCUSSION...TSTMS ARE EXPECTED TO INCREASE IN COVERAGE AND
INTENSITY THIS AFTERNOON INTO EVENING ALONG AND AHEAD OF COLD FRONT
ADVANCING EWD/SEWD THROUGH THE REGION. WARM SECTOR AIR MASS HAS
WARMED THROUGH THE 70S INTO LOWER 80S...AND WHEN COUPLED WITH
DEWPOINTS IN THE 50S AND STEEP MIDLEVEL LAPSE RATES...ENVIRONMENT
HAS BECOME MODERATELY UNSTABLE WITH SBCAPE OF 1000-2000 J/KG. THIS
INSTABILITY IN CONJUNCTION WITH A BELT OF 50+ KT WLY FLOW ABOVE 3 KM
AGL WILL SUPPORT ORGANIZED STORM MODES INCLUDING SUPERCELLS AND
BOWING STRUCTURES CAPABLE OF MAINLY DAMAGING WINDS AND LARGE HAIL.

AVIATION...A FEW SEVERE THUNDERSTORMS WITH HAIL SURFACE AND ALOFT
TO 2 INCHES. EXTREME TURBULENCE AND SURFACE WIND GUSTS TO 60
KNOTS. A FEW CUMULONIMBI WITH MAXIMUM TOPS TO 500. MEAN STORM
MOTION VECTOR 25035.

...MEAD

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