

000 

WWUS20 KWNS 160325

SEL6

SPC WW 160325

OHZ000-160700-



URGENT - IMMEDIATE BROADCAST REQUESTED

SEVERE THUNDERSTORM WATCH NUMBER 276

NWS STORM PREDICTION CENTER NORMAN OK

1125 PM EDT TUE MAY 15 2007



THE NWS STORM PREDICTION CENTER HAS ISSUED A

SEVERE THUNDERSTORM WATCH FOR PORTIONS OF



       CENTRAL OHIO



EFFECTIVE THIS TUESDAY NIGHT AND WEDNESDAY MORNING FROM 1125 PM

UNTIL 300 AM EDT.



HAIL TO 1 INCH 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 40

STATUTE MILES NORTH AND SOUTH OF A LINE FROM 70 MILES WEST

SOUTHWEST OF COLUMBUS OHIO TO 35 MILES EAST NORTHEAST OF COLUMBUS

OHIO.  FOR A COMPLETE DEPICTION OF THE WATCH SEE THE ASSOCIATED

WATCH OUTLINE UPDATE (WOUS64 KWNS WOU6).



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...SMALL MCS OVER SW OH IS MOVING QUICKLY NEWD...WITH THE

STRONGEST CONVECTION NOTED NEAR THE INTERSECTION OF THE MCS AND A

WSW-ENE ORIENTED OUTFLOW BOUNDARY FROM EARLIER STORMS IN N/NE OH.

RESIDUAL STEEP LAPSE RATES IN THE LOW LEVELS...ALONG WITH 40-50 KT

FLOW AND STRONG ASCENT WITH THE BOUNDARY MERGERS...SHOULD HELP THE

STORMS TO MAINTAIN INTENSITY FOR ANOTHER COUPLE OF HOURS.  DAMAGING

WINDS AND MARGINALLY SEVERE HAIL WILL BE THE MAIN SEVERE

THREATS...BEFORE STORMS WEAKEN TOWARD ERN OH.



AVIATION...A FEW SEVERE THUNDERSTORMS WITH HAIL SURFACE AND ALOFT

TO 1 INCH. EXTREME TURBULENCE AND SURFACE WIND GUSTS TO 60 KNOTS.

A FEW CUMULONIMBI WITH MAXIMUM TOPS TO 450. MEAN STORM MOTION

VECTOR 25045.





...THOMPSON

