WATCHES: Severe Thunderstorm Watch Number 187

WWUS20 KWNS 251818
SEL7
SPC WW 251818
ARZ000-KSZ000-MOZ000-OKZ000-260200-

URGENT - IMMEDIATE BROADCAST REQUESTED
SEVERE THUNDERSTORM WATCH NUMBER 187
NWS STORM PREDICTION CENTER NORMAN OK
115 PM CDT WED APR 25 2007

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

NORTHWEST ARKANSAS
SOUTHEASTERN AND EAST CENTRAL KANSAS
SOUTHWEST AND WEST CENTRAL MISSOURI
NORTHEAST OKLAHOMA

EFFECTIVE THIS WEDNESDAY AFTERNOON AND EVENING FROM 115 PM UNTIL
900 PM CDT.

HAIL TO 1.5 INCHES IN DIAMETER...THUNDERSTORM WIND GUSTS TO 60
MPH...AND DANGEROUS LIGHTNING ARE POSSIBLE IN THESE AREAS.

THE SEVERE THUNDERSTORM WATCH AREA IS APPROXIMATELY ALONG AND 90
STATUTE MILES EAST AND WEST OF A LINE FROM 30 MILES WEST
NORTHWEST OF KNOB NOSTER MISSOURI TO 35 MILES SOUTH SOUTHEAST OF
GROVE OKLAHOMA. FOR A COMPLETE DEPICTION OF THE WATCH SEE THE
ASSOCIATED WATCH OUTLINE UPDATE (WOUS64 KWNS WOU7).

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 186...

DISCUSSION...TSTMS EXPECTED TO INCREASE IN COVERAGE AND INTENSITY IN
ERN QUADRANT OF UPR VORT ROUNDING BASE OF KS/OK UPR LOW.
CONVERGENCE INVOF ASSOCIATED SFC LOW AND CONTINUED HEATING SUGGEST
GOOD POTENTIAL FOR HAIL IN ENVIRONMENT OF MODEST DEEP SHEAR BENEATH
UPR COLD POCKET. POTENTIAL FOR A BRIEF TORNADO WILL ALSO
EXIST...MOST LIKELY NEAR INTERSECTION OF N/S COLD FRONT WITH W/E
ORIENTED CONVECTIVE BAND IN SE KS. BUT BACKGROUND PATTERN OF
RELATIVELY WEAK LOW LEVEL SHEAR SUGGESTS THAT ANY SUCH ACTIVITY
SHOULD BE BRIEF.

AVIATION...A FEW SEVERE THUNDERSTORMS WITH HAIL SURFACE AND ALOFT
TO 1.5 INCHES. EXTREME TURBULENCE AND SURFACE WIND GUSTS TO 50
KNOTS. A FEW CUMULONIMBI WITH MAXIMUM TOPS TO 450. MEAN STORM
MOTION VECTOR 22030.

..CORFIDI

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