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WWUS20 KWNS 301927

SEL8

SPC WW 301927

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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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