

750 

WWUS20 KWNS 022057

SEL0

SPC WW 022057

ARZ000-LAZ000-MSZ000-030200-



URGENT - IMMEDIATE BROADCAST REQUESTED

SEVERE THUNDERSTORM WATCH NUMBER 110

NWS STORM PREDICTION CENTER NORMAN OK

355 PM CDT THU APR 2 2009



THE NWS STORM PREDICTION CENTER HAS ISSUED A

SEVERE THUNDERSTORM WATCH FOR PORTIONS OF



       EASTERN ARKANSAS

       EXTREME NORTHEAST LOUISIANA

       NORTHWEST MISSISSIPPI



EFFECTIVE THIS THURSDAY AFTERNOON AND EVENING FROM 355 PM UNTIL

900 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 60

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

LITTLE ROCK ARKANSAS TO 60 MILES SOUTH SOUTHWEST OF GREENWOOD

MISSISSIPPI.  FOR A COMPLETE DEPICTION OF THE WATCH SEE THE

ASSOCIATED WATCH OUTLINE UPDATE (WOUS64 KWNS WOU0).



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...THIS SEVERE THUNDERSTORM WATCH REPLACES

TORNADO WATCH NUMBER 105. WATCH NUMBER 105 WILL NOT BE IN EFFECT

AFTER 355 PM CDT. CONTINUE...WW 107...WW 108...WW 109...



DISCUSSION...A SMALL ARC OF LOW-TOPPED STORMS WILL LIKELY INCREASE A

LITTLE IN COVERAGE/INTENSITY AS THE SYNOPTIC CYCLONE MOVES EWD FROM

CENTRAL AR TOWARD NW MS THIS EVENING.  A NARROW CORRIDOR OF SURFACE

HEATING IN THE WAKE OF EARLIER STORMS...AND STEEP LAPSE RATES NEAR

THE MID LEVEL COLD CORE...WILL SUPPORT SUFFICIENTLY STRONG UPDRAFTS

FOR AT LEAST ISOLATED LARGE HAIL.  THERE WILL ALSO BE SOME THREAT

FOR SMALL SUPERCELLS WITHIN THE ARC OF STORMS...GIVEN SOME RESPONSE

IN THE LOW-LEVEL FLOW TO PRESSURE FALLS...AND DEEP LAYER VERTICAL

SHEAR BENEATH THE CYCLONIC SIDE OF THE MID LEVEL JET.



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 400. MEAN STORM

MOTION VECTOR 25035.





...THOMPSON

