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812 

WWUS20 KWNS 302346

SEL0

SPC WW 302346

KYZ000-OHZ000-WVZ000-310400-



URGENT - IMMEDIATE BROADCAST REQUESTED

SEVERE THUNDERSTORM WATCH NUMBER 120

NWS STORM PREDICTION CENTER NORMAN OK

745 PM EDT FRI MAR 30 2012



THE NWS STORM PREDICTION CENTER HAS ISSUED A

SEVERE THUNDERSTORM WATCH FOR PORTIONS OF



       EXTREME NORTHERN KENTUCKY

       SOUTH CENTRAL AND SOUTHEAST OHIO

       NORTHWEST WEST VIRGINIA AND THE NORTHERN WEST VIRGINIA

PANHANDLE



EFFECTIVE THIS FRIDAY NIGHT FROM 745 PM UNTIL MIDNIGHT 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 35

STATUTE MILES NORTH AND SOUTH OF A LINE FROM 30 MILES SOUTH OF

WHEELING WEST VIRGINIA TO 25 MILES SOUTH OF CINCINNATI OHIO.  FOR

A COMPLETE DEPICTION OF THE WATCH SEE THE ASSOCIATED WATCH

OUTLINE UPDATE (WOUS64 KWNS WOU0).



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 118...WW 119...



DISCUSSION...A BROKEN BAND OF SEVERE STORMS WILL CONTINUE SPREAD

ESEWD TOWARD THE OH RIVER IN ASSOCIATION WITH A MIDLEVEL TROUGH AND

SURFACE COLD FRONT.  WEAK-MODERATE INSTABILITY PERSISTS IN ADVANCE

OF THE FRONT...AND VERTICAL SHEAR IS SUFFICIENT FOR BOTH EMBEDDED

SUPERCELLS AND BOWING SEGMENTS.  GIVEN THE SOMEWHAT MODEST BOUNDARY

LAYER MOISTURE...DAMAGING WINDS AND LARGE HAIL APPEAR TO BE THE

PRIMARY SEVERE THREATS BEFORE INSTABILITY DIMINISHES LATER TONIGHT.



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 450. MEAN STORM

MOTION VECTOR 29035.





...THOMPSON

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