WW 147 SEVERE TSTM KS OK 072255Z – 080400Z
URGENT - IMMEDIATE BROADCAST REQUESTED
SEVERE THUNDERSTORM WATCH NUMBER 147
NWS STORM PREDICTION CENTER NORMAN OK
555 PM CDT TUE MAY 7 2013
THE NWS STORM PREDICTION CENTER HAS ISSUED A
* SEVERE THUNDERSTORM WATCH FOR PORTIONS OF
SOUTHWEST KANSAS
NORTHWEST OKLAHOMA
* EFFECTIVE THIS TUESDAY AFTERNOON AND EVENING FROM 555 PM UNTIL
1100 PM CDT.
* PRIMARY THREATS INCLUDE...
SEVERAL LARGE HAIL EVENTS WITH A FEW VERY LARGE HAIL EVENTS TO 2
INCHES IN DIAMETER POSSIBLE
SEVERAL DAMAGING WIND GUSTS TO 70 MPH POSSIBLE
THE SEVERE THUNDERSTORM WATCH AREA IS APPROXIMATELY ALONG AND 65
STATUTE MILES EAST AND WEST OF A LINE FROM 80 MILES NORTH
NORTHEAST OF GARDEN CITY KANSAS TO 55 MILES SOUTHWEST OF ALVA
OKLAHOMA. FOR A COMPLETE DEPICTION OF THE WATCH SEE THE
ASSOCIATED WATCH OUTLINE UPDATE (WOUS64 KWNS WOU7).
PRECAUTIONARY/PREPAREDNESS ACTIONS...
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...SCATTERED THUNDERSTORMS ARE INCREASING ACROSS SOUTHWEST
KS AND NORTHWEST OK. THESE STORMS ARE FORMING ALONG AN INSTABILITY
AXIS WHERE SUFFICIENT MLCAPE AND STEEP LAPSE RATES WILL PROMOTE HAIL
POTENTIAL IN THE STRONGEST STORMS. THE LOW LEVEL JET WILL ALSO
STRENGTHEN THIS EVENING...HELPING TO MAINTAIN/ORGANIZE THE
CONVECTION DESPITE WEAKENING INSTABILITY AFTER DARK.
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 450. MEAN STORM
MOTION VECTOR 26025.
...HART
via SPC Forecast Products http://www.spc.noaa.gov/products/watch/ww0147.html
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