WATCHES: Tornado Watch Number 312

WWUS20 KWNS 201605
SEL2
SPC WW 201605
ARZ000-LAZ000-OKZ000-TXZ000-202300-

URGENT - IMMEDIATE BROADCAST REQUESTED
TORNADO WATCH NUMBER 312
NWS STORM PREDICTION CENTER NORMAN OK
1105 AM CDT FRI MAY 20 2011

THE NWS STORM PREDICTION CENTER HAS ISSUED A
TORNADO WATCH FOR PORTIONS OF

WESTERN ARKANSAS
NORTHWEST LOUISIANA
EASTERN OKLAHOMA
NORTHEAST TEXAS

EFFECTIVE THIS FRIDAY MORNING AND EVENING FROM 1105 AM UNTIL 600
PM CDT.

TORNADOES...HAIL TO 1.5 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 70 STATUTE
MILES EAST AND WEST OF A LINE FROM 50 MILES NORTH NORTHWEST OF
RUSSELLVILLE ARKANSAS TO 5 MILES SOUTHEAST OF LONGVIEW TEXAS.
FOR A COMPLETE DEPICTION OF THE WATCH SEE THE ASSOCIATED WATCH
OUTLINE UPDATE (WOUS64 KWNS WOU2).

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.

DISCUSSION...TSTMS SHOULD CONTINUE TO INTENSIFY THIS AFTERNOON AS
THEY ENCOUNTER A VERY MOIST AND MODERATELY UNSTABLE AIR MASS WITH
MLCAPE VALUES INCREASING TO 1500-2500 J/KG. WHILE MID AND
HIGH-LEVEL WIND FIELD WILL REMAIN MARGINAL FOR STORM
ORGANIZATION...THE PRESENCE OF A 40-50 KT SLY LLJ AND RESULTANT
EFFECTIVE SRH OF 250-400 M2/S2 WILL PROMOTE ENHANCED LOW-LEVEL STORM
ROTATION WITH A RISK FOR TORNADOES.

AVIATION...TORNADOES AND 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
500. MEAN STORM MOTION VECTOR 22030.

...MEAD

+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-
To unsubscribe from WX-STORM send e-mail to LISTSERV@LISTSERV.ILLINOIS.EDU with
"unsub wx-storm" in the body of your message. For more information write cnovy@cox.net.