

251 

WWUS20 KWNS 281649

SEL1

SPC WW 281649

ARZ000-LAZ000-OKZ000-TXZ000-290000-



URGENT - IMMEDIATE BROADCAST REQUESTED

SEVERE THUNDERSTORM WATCH NUMBER 571...RESENT

NWS STORM PREDICTION CENTER NORMAN OK

1150 AM CDT TUE JUN 28 2011



THE NWS STORM PREDICTION CENTER HAS ISSUED A

SEVERE THUNDERSTORM WATCH FOR PORTIONS OF



       CENTRAL AND SOUTHERN ARKANSAS

       NORTHERN LOUISIANA

       FAR SOUTHEAST OKLAHOMA

       FAR NORTHEAST TEXAS



EFFECTIVE THIS TUESDAY MORNING AND EVENING FROM 1150 AM UNTIL 700

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 90

STATUTE MILES NORTH AND SOUTH OF A LINE FROM 10 MILES NORTH OF

MONTICELLO ARKANSAS TO 40 MILES WEST NORTHWEST OF DE QUEEN

ARKANSAS.  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.



OTHER WATCH INFORMATION...CONTINUE...WW 568...WW 569...WW 570...



DISCUSSION...A HOT AND HUMID AIR MASS WITH MLCAPE OF 2500-3500 J/KG

WILL FUEL SEVERE TSTMS TODAY ACROSS THE WATCH AREA.  ONGOING STORMS

ACROSS AR WILL LIKELY CONTINUE TO PROPAGATE SWD AS THEIR ASSOCIATED

COLD POOL INTENSIFIES.  MOREOVER...PERSISTENT LOW-LEVEL WAA FROM THE

W MAY SUPPORT THE WWD EXPANSION OF STORMS INTO SERN OK/NERN TX.

GIVEN THE STEEP MIDLEVEL LAPSE RATES AND AROUND 30 KT OF EFFECTIVE

BULK SHEAR...SETUP WILL FAVOR INTENSE UPDRAFTS CAPABLE OF LARGE HAIL

AND DAMAGING WINDS.



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 33025.





...MEAD



128 

WWUS20 KWNS 281649

SEL1

SPC WW 281649

ARZ000-LAZ000-OKZ000-TXZ000-290000-



URGENT - IMMEDIATE BROADCAST REQUESTED

SEVERE THUNDERSTORM WATCH NUMBER 571

NWS STORM PREDICTION CENTER NORMAN OK

1150 AM CDT TUE JUN 28 2011



THE NWS STORM PREDICTION CENTER HAS ISSUED A

SEVERE THUNDERSTORM WATCH FOR PORTIONS OF



       CENTRAL AND SOUTHERN ARKANSAS

       NORTHERN LOUISIANA

       FAR SOUTHEAST OKLAHOMA

       FAR NORTHEAST TEXAS



EFFECTIVE THIS TUESDAY MORNING AND EVENING FROM 1150 AM UNTIL 700

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 90

STATUTE MILES NORTH AND SOUTH OF A LINE FROM 10 MILES NORTH OF

MONTICELLO ARKANSAS TO 40 MILES WEST NORTHWEST OF DE QUEEN

ARKANSAS.  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.



OTHER WATCH INFORMATION...CONTINUE...WW 568...WW 569...WW 570...



DISCUSSION...A HOT AND HUMID AIR MASS WITH MLCAPE OF 2500-3500 J/KG

WILL FUEL SEVERE TSTMS TODAY ACROSS THE WATCH AREA.  ONGOING STORMS

ACROSS AR WILL LIKELY CONTINUE TO PROPAGATE SWD AS THEIR ASSOCIATED

COLD POOL INTENSIFIES.  MOREOVER...PERSISTENT LOW-LEVEL WAA FROM THE

W MAY SUPPORT THE WWD EXPANSION OF STORMS INTO SERN OK/NERN TX.

GIVEN THE STEEP MIDLEVEL LAPSE RATES AND AROUND 30 KT OF EFFECTIVE

BULK SHEAR...SETUP WILL FAVOR INTENSE UPDRAFTS CAPABLE OF LARGE HAIL

AND DAMAGING WINDS.



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 33025.





...MEAD

