

288 

WWUS20 KWNS 272135

SEL6

SPC WW 272135

ARZ000-MOZ000-280300-



URGENT - IMMEDIATE BROADCAST REQUESTED

SEVERE THUNDERSTORM WATCH NUMBER 36

NWS STORM PREDICTION CENTER NORMAN OK

435 PM CDT SAT MAR 27 2010



THE NWS STORM PREDICTION CENTER HAS ISSUED A

SEVERE THUNDERSTORM WATCH FOR PORTIONS OF



       CENTRAL AND EASTERN ARKANSAS

       SOUTH CENTRAL MISSOURI



EFFECTIVE THIS SATURDAY AFTERNOON AND EVENING FROM 435 PM UNTIL

1000 PM CDT.



HAIL TO 1.5 INCHES 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 75

STATUTE MILES EAST AND WEST OF A LINE FROM 55 MILES NORTH OF WEST

PLAINS MISSOURI TO 35 MILES WEST OF MONTICELLO ARKANSAS.  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...WELL-DEFINED MID LEVEL TROUGH AND ASSOCIATED SURFACE

CYCLONE/COLD FRONT WILL CONTINUE TO MOVE EWD ACROSS MO/AR THROUGH

LATE EVENING...WITH A BAND OF STRONG ASCENT FOCUSING THUNDERSTORM

DEVELOPMENT INVOF THE COLD FRONT.  STEEP LAPSE RATES AND COLD MID

LEVEL TEMPERATURES...ALONG WITH A SUPERCELL WIND PROFILE...WILL

SUPPORT STORMS CAPABLE OF PRODUCING LARGE HAIL FOR THE NEXT SEVERAL

HOURS.  STORMS SHOULD GRADUALLY CONSOLIDATE INTO MORE OF A SOLID

LINE LATER THIS EVENING WITH AN INCREASED THREAT FOR DAMAGING WINDS.

 THE RELATIVELY LIMITED LOW-LEVEL MOISTURE /BOUNDARY LAYER DEWPOINTS

IN THE MID 40S TO LOW 50S/ WILL TEMPER ANY TORNADO THREAT...DESPITE

THE STRONG LOW-LEVEL AND DEEP-LAYER SHEAR.



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

TO 1.5 INCHES. EXTREME TURBULENCE AND SURFACE WIND GUSTS TO 60

KNOTS. A FEW CUMULONIMBI WITH MAXIMUM TOPS TO 350. MEAN STORM

MOTION VECTOR 23040.





...THOMPSON

