

687 

WWUS20 KWNS 040931

SEL8

SPC WW 040931

INZ000-KYZ000-MIZ000-OHZ000-LEZ000-041700-



URGENT - IMMEDIATE BROADCAST REQUESTED

SEVERE THUNDERSTORM WATCH NUMBER 88

NWS STORM PREDICTION CENTER NORMAN OK

530 AM EDT MON APR 4 2011



THE NWS STORM PREDICTION CENTER HAS ISSUED A

SEVERE THUNDERSTORM WATCH FOR PORTIONS OF



       EASTERN AND SOUTHERN INDIANA

       FAR NORTHERN KENTUCKY

       SOUTHERN LOWER MICHIGAN

       WESTERN OHIO

       LAKE ERIE



EFFECTIVE THIS MONDAY MORNING AND AFTERNOON FROM 530 AM UNTIL 100

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 80

STATUTE MILES EAST AND WEST OF A LINE FROM 30 MILES NORTH

NORTHEAST OF TOLEDO OHIO TO 60 MILES WEST SOUTHWEST OF CINCINNATI

OHIO.  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.



OTHER WATCH INFORMATION...CONTINUE...WW 87...



DISCUSSION...A FAST-MOVING BAND OF TSTMS HAS RECENTLY INTENSIFIED

AHEAD OF COLD FRONT WITHIN A WARMING...MOISTENING BOUNDARY.  GIVEN

THE STRONG AMBIENT SHEAR AND EVAPORATIVE COOLING POTENTIAL IN

SUB-CLOUD LAYER...A RISK FOR DAMAGING WIND GUSTS WILL ACCOMPANY

STORMS AS THEY MOVE ACROSS WW AREA.



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 400. MEAN STORM

MOTION VECTOR 26050.





...MEAD

