

888 

WWUS20 KWNS 022000

SEL7

SPC WW 022000

ALZ000-MSZ000-030200-



URGENT - IMMEDIATE BROADCAST REQUESTED

TORNADO WATCH NUMBER 227

NWS STORM PREDICTION CENTER NORMAN OK

300 PM CDT SAT MAY 2 2009



THE NWS STORM PREDICTION CENTER HAS ISSUED A

TORNADO WATCH FOR PORTIONS OF



       NORTHERN ALABAMA

       NORTH-CENTRAL MISSISSIPPI



EFFECTIVE THIS SATURDAY AFTERNOON AND EVENING FROM 300 PM UNTIL

900 PM CDT.



TORNADOES...HAIL TO 3 INCHES IN DIAMETER...THUNDERSTORM WIND

GUSTS TO 70 MPH...AND DANGEROUS LIGHTNING ARE POSSIBLE IN THESE

AREAS.



THE TORNADO WATCH AREA IS APPROXIMATELY ALONG AND 60 STATUTE

MILES NORTH AND SOUTH OF A LINE FROM 20 MILES SOUTH SOUTHWEST OF

GREENVILLE MISSISSIPPI TO 30 MILES EAST NORTHEAST OF GADSDEN

ALABAMA.  FOR A COMPLETE DEPICTION OF THE WATCH SEE THE

ASSOCIATED WATCH OUTLINE UPDATE (WOUS64 KWNS WOU7).



REMEMBER...A TORNADO WATCH MEANS CONDITIONS ARE FAVORABLE FOR

TORNADOES AND 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.



OTHER WATCH INFORMATION...CONTINUE...WW 225...WW 226...



DISCUSSION...STORMS INCREASING WITHIN REMNANT MCV AND ALONG FRONTAL

ZONE NEAR AL/MS BORDER HAVE RECENTLY REACHED SEVERE LEVELS WITH SOME

REPORTS OF TORNADOES. THIS CONVECTION WAS WELL IN ADVANCE OF

STRONGER SYSTEM DEVELOPING EAST FROM NERN TX BUT THE ACTIVITY WILL

CONTINUE TO MOVE EAST INTO RECOVERING AIR MASS ACROSS NRN AL.

INCREASING DEEP-LAYER FLOW IN A BAND SOUTH OF THE MCV...AND

INCREASING INSTABILITY OVER AL SHOULD CONTINUE TO SUPPORT SOME

SEVERE STORMS WITH WIND AND PERHAPS SOME HAIL. GREATER AND MORE

WIDESPREAD TORNADO AND WIND THREAT EXPECTED TO EVOLVE EWD FROM AR

INTO MS AND THEN AGAIN AL LATER TODAY. THIS CONVECTION WILL BE

ASSOCIATED WITH LARGE SCALE ASCENT AHEAD OF EWD MOVING MID/UPPER

LEVEL WAVE. CELLS TRACKING ALONG NEAR THE FRONTAL ZONE AND VARIOUS

OUTFLOW BOUNDARIES FROM ONGOING ACTIVITY WILL HAVE ACCESS TO

STRONGER LOW LEVEL SHEAR AND COULD PRODUCE A FEW TORNADOES IN

ADDITION TO LARGE HAIL AND WIND.



AVIATION...TORNADOES AND A FEW SEVERE THUNDERSTORMS WITH HAIL

SURFACE AND ALOFT TO 3 INCHES. EXTREME TURBULENCE AND SURFACE

WIND GUSTS TO 60 KNOTS. A FEW CUMULONIMBI WITH MAXIMUM TOPS TO

500. MEAN STORM MOTION VECTOR 27025.





...CARBIN

