2:34
URGENT - IMMEDIATE BROADCAST REQUESTED
SEVERE THUNDERSTORM WATCH NUMBER 221
NWS STORM PREDICTION CENTER NORMAN OK
225 PM CDT FRI MAY 1 2009
THE NWS STORM PREDICTION CENTER HAS ISSUED A
SEVERE THUNDERSTORM WATCH FOR PORTIONS OF
NORTHERN ALABAMA
NORTHEAST MISSISSIPPI
SOUTHERN AND MIDDLE TENNESSEE
EFFECTIVE THIS FRIDAY AFTERNOON AND EVENING FROM 225 PM UNTIL 700
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 50
STATUTE MILES NORTH AND SOUTH OF A LINE FROM 50 MILES WEST OF
MUSCLE SHOALS ALABAMA TO 75 MILES EAST NORTHEAST OF HUNTSVILLE
ALABAMA. FOR A COMPLETE DEPICTION OF THE WATCH SEE THE
ASSOCIATED WATCH OUTLINE UPDATE (WOUS64 KWNS WOU1).
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...MCS ACROSS TN VALLEY SHOULD CONTINUE TO STRENGTHEN WITH
DIURNAL HEATING OF THE DAY AND CONTINUING INCREASE IN MASS INFLOW ON
THE NOSE OF 30KT LLJ. ABUNDANT INSTABILITY FEEDING INTO THIS
COMPLEX...AND PRESENCE OF ENHANCED LOW LEVEL STORM RELATIVE FLOW
NEAR RESIDUAL OUTFLOW/WARM FRONT ACROSS AL...SHOULD CONTRIBUTE TO
UPDRAFT PERSISTENCE. MESOSCALE ORGANIZATION...COUPLED WITH WARMING
BOUNDARY LAYER...SHOULD SUPPORT OCCASIONAL DAMAGING WIND GUSTS AND
PERHAPS SOME HAIL FORM SOME OF THE STRONGER CORES.
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 450. MEAN STORM
MOTION VECTOR 30020.
SEVERE THUNDERSTORM WATCH NUMBER 221
NWS STORM PREDICTION CENTER NORMAN OK
225 PM CDT FRI MAY 1 2009
THE NWS STORM PREDICTION CENTER HAS ISSUED A
SEVERE THUNDERSTORM WATCH FOR PORTIONS OF
NORTHERN ALABAMA
NORTHEAST MISSISSIPPI
SOUTHERN AND MIDDLE TENNESSEE
EFFECTIVE THIS FRIDAY AFTERNOON AND EVENING FROM 225 PM UNTIL 700
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 50
STATUTE MILES NORTH AND SOUTH OF A LINE FROM 50 MILES WEST OF
MUSCLE SHOALS ALABAMA TO 75 MILES EAST NORTHEAST OF HUNTSVILLE
ALABAMA. FOR A COMPLETE DEPICTION OF THE WATCH SEE THE
ASSOCIATED WATCH OUTLINE UPDATE (WOUS64 KWNS WOU1).
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...MCS ACROSS TN VALLEY SHOULD CONTINUE TO STRENGTHEN WITH
DIURNAL HEATING OF THE DAY AND CONTINUING INCREASE IN MASS INFLOW ON
THE NOSE OF 30KT LLJ. ABUNDANT INSTABILITY FEEDING INTO THIS
COMPLEX...AND PRESENCE OF ENHANCED LOW LEVEL STORM RELATIVE FLOW
NEAR RESIDUAL OUTFLOW/WARM FRONT ACROSS AL...SHOULD CONTRIBUTE TO
UPDRAFT PERSISTENCE. MESOSCALE ORGANIZATION...COUPLED WITH WARMING
BOUNDARY LAYER...SHOULD SUPPORT OCCASIONAL DAMAGING WIND GUSTS AND
PERHAPS SOME HAIL FORM SOME OF THE STRONGER CORES.
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 450. MEAN STORM
MOTION VECTOR 30020.
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