URGENT - IMMEDIATE BROADCAST REQUESTED
TORNADO WATCH NUMBER 335 NWS STORM PREDICTION CENTER NORMAN OK
850 PM CDT SUN MAY 22 2011
THE NWS STORM PREDICTION CENTER HAS ISSUED A
TORNADO WATCH FOR PORTIONS OF
NORTHERN ARKANSAS
THE SOUTHERN MISSOURI BOOTHEEL
EASTERN OKLAHOMA
EFFECTIVE THIS SUNDAY NIGHT AND MONDAY MORNING FROM 850 PM UNTIL
400 AM CDT.
TORNADOES...HAIL TO 2.5 INCHES IN DIAMETER...THUNDERSTORM WIND
GUSTS TO 80 MPH...AND DANGEROUS LIGHTNING ARE POSSIBLE IN THESE
AREAS.
THE TORNADO WATCH AREA IS APPROXIMATELY ALONG AND 140 STATUTE
MILES EAST AND WEST OF A LINE FROM 50 MILES EAST NORTHEAST OF
FLIPPIN ARKANSAS TO 45 MILES EAST SOUTHEAST OF POTEAU OKLAHOMA.
FOR A COMPLETE DEPICTION OF THE WATCH SEE THE ASSOCIATED WATCH
OUTLINE UPDATE (WOUS64 KWNS WOU5).
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...THIS TORNADO WATCH REPLACES TORNADO
WATCH NUMBER 330. WATCH NUMBER 330 WILL NOT BE IN EFFECT AFTER
850 PM CDT. CONTINUE...WW 323...WW 325...WW 326...WW 327...WW
329...WW 332...WW 333...WW 334...
DISCUSSION...THUNDERSTORM CLUSTERS WITH EMBEDDED SUPERCELLS/BOWS
WILL PERSIST OVERNIGHT WHILE DEVELOPING ESEWD ALONG A RESIDUAL
OUTFLOW BOUNDARY ACROSS NRN AR. THE 00Z LZK SOUNDING REVEALED A
RELATIVELY MOIST AND STRONGLY SHEARED ENVIRONMENT THAT APPEARS TO BE
REPRESENTATIVE OF NRN AR...THUS A RISK FOR TORNADOES IS EXPECTED TO
PERSIST WITH SUPERCELLS AND BOW/BOUNDARY INTERACTIONS. DAMAGING
WINDS ARE ALSO LIKELY THE CELL MERGERS AND BOWING SEGMENTS...AS WELL
AS THE RISK FOR LARGE HAIL GIVEN A RESERVOIR OF STRONG INSTABILITY
ACROSS OK/AR IN ADVANCE OF THE STORMS.
AVIATION...TORNADOES AND A FEW SEVERE THUNDERSTORMS WITH HAIL
SURFACE AND ALOFT TO 2.5 INCHES. EXTREME TURBULENCE AND SURFACE
WIND GUSTS TO 70 KNOTS. A FEW CUMULONIMBI WITH MAXIMUM TOPS TO
550. MEAN STORM MOTION VECTOR 28035.
...THOMPSON
