SPC Severe Thunderstorm Watch 109

WW 109 SEVERE TSTM KS MO OK 160315Z – 161000Z


URGENT - IMMEDIATE BROADCAST REQUESTED
SEVERE THUNDERSTORM WATCH NUMBER 109
NWS STORM PREDICTION CENTER NORMAN OK
1015 PM CDT MON APR 15 2013

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

       SOUTHEASTERN KANSAS
       CENTRAL AND SOUTHWEST MISSOURI
       NORTHEAST OKLAHOMA

EFFECTIVE THIS MONDAY NIGHT AND TUESDAY MORNING FROM 1015 PM
UNTIL 500 AM CDT.

HAIL TO 2 INCHES IN DIAMETER...THUNDERSTORM WIND GUSTS TO 65
MPH...AND DANGEROUS LIGHTNING ARE POSSIBLE IN THESE AREAS.

THE SEVERE THUNDERSTORM WATCH AREA IS APPROXIMATELY ALONG AND 65
STATUTE MILES NORTH AND SOUTH OF A LINE FROM 20 MILES WEST OF
BARTLESVILLE OKLAHOMA TO 50 MILES EAST OF COLUMBIA MISSOURI.  FOR
A COMPLETE DEPICTION OF THE WATCH SEE THE ASSOCIATED WATCH
OUTLINE UPDATE (WOUS64 KWNS WOU9).

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...WARM ADVECTION ASSOCIATED WITH AN INCREASING LOW-LEVEL
JET ATOP A COOL POST-FRONTAL AIRMASS WILL CONTINUE TO SUPPORT
ELEVATED THUNDERSTORM DEVELOPMENT THIS EVENING/OVERNIGHT.  WITH
STEEP MID-LEVEL LAPSE RATES SUPPORTING 1000 TO 1500 J/KG ELEVATED
CAPE AND 40 TO 50 KT MID-LEVEL WEST-SOUTHWESTERLIES CONTRIBUTING TO
CLOUD-LAYER SHEAR SUPPORTIVE OF ORGANIZED/INTENSE UPDRAFTS...LARGE
HAIL CAN BE EXPECTED ACROSS THIS AREA.

AVIATION...A FEW SEVERE THUNDERSTORMS WITH HAIL SURFACE AND ALOFT
TO 2 INCHES. EXTREME TURBULENCE AND SURFACE WIND GUSTS TO 55
KNOTS. A FEW CUMULONIMBI WITH MAXIMUM TOPS TO 500. MEAN STORM
MOTION VECTOR 24035.


...GOSS

via SPC Forecast Products http://www.spc.noaa.gov/products/watch/ww0109.html