SPC Severe Thunderstorm Watch 325

WW 325 SEVERE TSTM OK TX 302315Z – 310700Z


URGENT - IMMEDIATE BROADCAST REQUESTED
SEVERE THUNDERSTORM WATCH NUMBER 325
NWS STORM PREDICTION CENTER NORMAN OK
615 PM CDT WED MAY 30 2012

THE NWS STORM PREDICTION CENTER HAS ISSUED A
SEVERE THUNDERSTORM WATCH FOR PORTIONS OF

       WESTERN AND CENTRAL OKLAHOMA
       A SMALL PART OF NORTH TEXAS

EFFECTIVE THIS WEDNESDAY NIGHT AND THURSDAY MORNING FROM 615 PM
UNTIL 200 AM CDT.

HAIL TO 2.5 INCHES IN DIAMETER...THUNDERSTORM WIND GUSTS TO 75
MPH...AND DANGEROUS LIGHTNING ARE POSSIBLE IN THESE AREAS.

THE SEVERE THUNDERSTORM WATCH AREA IS APPROXIMATELY ALONG AND 85
STATUTE MILES EAST AND WEST OF A LINE FROM 20 MILES NORTHEAST OF
ALVA OKLAHOMA TO 40 MILES SOUTH OF WICHITA FALLS TEXAS.  FOR A
COMPLETE DEPICTION OF THE WATCH SEE THE ASSOCIATED WATCH OUTLINE
UPDATE (WOUS64 KWNS WOU5).

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 321...WW 322...WW
323...WW 324...

DISCUSSION...TSTMS ARE STARTING TO FORM OVER W CNTRL AND SW OK.
CURRENT CHARACTER/MOVEMENT OF THIS ACTIVITY SUGGEST THAT STORMS ARE
ROOTED ABOVE THE BOUNDARY LAYER.  THE TSTMS MAY CONTINUE TO INCREASE
IN COVERAGE/STRENGTH AS FORCING FOR ASCENT INCREASES WITH CONTINUED
ESE MOTION OF UPR LVL IMPULSES...AND WITH NOCTURNAL INCREASE IN LLJ.
SETUP APPEARS AT LEAST CONDITIONALLY FAVORABLE FOR LOCALLY DMGG WIND
GUSTS / HEAT BURSTS...AND POSSIBLY SVR HAIL.  ADDITIONAL STORMS...OR
A COMPLEX OF STORMS...MAY MOVE SSE INTO NRN OK FROM KS LATER THIS
EVE...POSING A FURTHER THREAT FOR HIGH WIND...SVR HAIL ...AND
POSSIBLY ISOLD TORNADOES.

AVIATION...A FEW SEVERE THUNDERSTORMS WITH HAIL SURFACE AND ALOFT
TO 2.5 INCHES. EXTREME TURBULENCE AND SURFACE WIND GUSTS TO 65
KNOTS. A FEW CUMULONIMBI WITH MAXIMUM TOPS TO 550. MEAN STORM
MOTION VECTOR 30025.


...CORFIDI

via SPC Forecast Products http://www.spc.noaa.gov/products/watch/ww0325.html