

142 

WWUS20 KWNS 182135

SEL4

SPC WW 182135

ALZ000-MSZ000-190300-



URGENT - IMMEDIATE BROADCAST REQUESTED

SEVERE THUNDERSTORM WATCH NUMBER 54

NWS STORM PREDICTION CENTER NORMAN OK

435 PM CDT MON MAR 18 2013



THE NWS STORM PREDICTION CENTER HAS ISSUED A

SEVERE THUNDERSTORM WATCH FOR PORTIONS OF



       PARTS OF SOUTHWEST AND SOUTH CENTRAL ALABAMA

       EXTREME SOUTHEAST MISSISSIPPI



EFFECTIVE THIS MONDAY AFTERNOON AND EVENING FROM 435 PM UNTIL

1000 PM CDT.



HAIL TO 2.5 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 35

STATUTE MILES NORTH AND SOUTH OF A LINE FROM 120 MILES WEST

SOUTHWEST OF SELMA ALABAMA TO 35 MILES SOUTHEAST OF SELMA

ALABAMA.  FOR A COMPLETE DEPICTION OF THE WATCH SEE THE

ASSOCIATED WATCH OUTLINE UPDATE (WOUS64 KWNS WOU4).



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 52...WW 53...



DISCUSSION...A BAND OF SEVERE STORMS...INCLUDING EMBEDDED

SUPERCELLS...WILL CONTINUE TO MOVE SEWD THROUGH THE

AFTERNOON/EVENING INTO SE MS AND THE NRN PARTS OF SW AL.  THE

ENVIRONMENT IN ADVANCE OF THESE STORMS IS QUITE FAVORABLE FOR

SUPERCELLS WITH LARGE HAIL...GIVEN THE STEEP LAPSE RATES...MLCAPE

AOA 2000 J/KG...RELATIVELY COOL MIDLEVEL TEMPERATURES...AND

EFFECTIVE BULK SHEAR NEAR 50 KT.  DAMAGING GUSTS WILL ALSO BE

POSSIBLE WITH THE STRONGEST STORMS...WHILE THE WARM ELEVATED MIXED

LAYER NOTED IN UPSTREAM SOUNDINGS MAY LIMIT THE SOUTHWARD EXTENT OF

STORM DEVELOPMENT.



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

TO 2.5 INCHES. EXTREME TURBULENCE AND SURFACE WIND GUSTS TO 60

KNOTS. A FEW CUMULONIMBI WITH MAXIMUM TOPS TO 500. MEAN STORM

MOTION VECTOR 29035.





...THOMPSON



637 

WWUS20 KWNS 182135

SEL4

SPC WW 182135

ALZ000-MSZ000-190300-



URGENT - IMMEDIATE BROADCAST REQUESTED

SEVERE THUNDERSTORM WATCH NUMBER 54

NWS STORM PREDICTION CENTER NORMAN OK

435 PM CDT MON MAR 18 2013



THE NWS STORM PREDICTION CENTER HAS ISSUED A

SEVERE THUNDERSTORM WATCH FOR PORTIONS OF



       PARTS OF SOUTHWEST AND SOUTH CENTRAL ALABAMA

       EXTREME SOUTHEAST MISSISSIPPI



EFFECTIVE THIS MONDAY AFTERNOON AND EVENING FROM 435 PM UNTIL

1000 PM CDT.



HAIL TO 2.5 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 35

STATUTE MILES NORTH AND SOUTH OF A LINE FROM 120 MILES WEST

SOUTHWEST OF SELMA ALABAMA TO 35 MILES SOUTHEAST OF SELMA

ALABAMA.  FOR A COMPLETE DEPICTION OF THE WATCH SEE THE

ASSOCIATED WATCH OUTLINE UPDATE (WOUS64 KWNS WOU4).



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 52...WW 53...



DISCUSSION...A BAND OF SEVERE STORMS...INCLUDING EMBEDDED

SUPERCELLS...WILL CONTINUE TO MOVE SEWD THROUGH THE

AFTERNOON/EVENING INTO SE MS AND THE NRN PARTS OF SW AL.  THE

ENVIRONMENT IN ADVANCE OF THESE STORMS IS QUITE FAVORABLE FOR

SUPERCELLS WITH LARGE HAIL...GIVEN THE STEEP LAPSE RATES...MLCAPE

AOA 2000 J/KG...RELATIVELY COOL MIDLEVEL TEMPERATURES...AND

EFFECTIVE BULK SHEAR NEAR 50 KT.  DAMAGING GUSTS WILL ALSO BE

POSSIBLE WITH THE STRONGEST STORMS...WHILE THE WARM ELEVATED MIXED

LAYER NOTED IN UPSTREAM SOUNDINGS MAY LIMIT THE SOUTHWARD EXTENT OF

STORM DEVELOPMENT.



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

TO 2.5 INCHES. EXTREME TURBULENCE AND SURFACE WIND GUSTS TO 60

KNOTS. A FEW CUMULONIMBI WITH MAXIMUM TOPS TO 500. MEAN STORM

MOTION VECTOR 29035.





...THOMPSON

