WATCHES: Severe Thunderstorm Watch Number 314

WWUS20 KWNS 201936
SEL4
SPC WW 201936
KSZ000-NEZ000-OKZ000-210300-

URGENT - IMMEDIATE BROADCAST REQUESTED
SEVERE THUNDERSTORM WATCH NUMBER 314
NWS STORM PREDICTION CENTER NORMAN OK
235 PM CDT FRI MAY 20 2011

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

CENTRAL KANSAS
CENTRAL AND EASTERN NEBRASKA
NORTHWEST OKLAHOMA

EFFECTIVE THIS FRIDAY AFTERNOON AND EVENING FROM 235 PM UNTIL
1000 PM CDT.

HAIL TO 2 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 65
STATUTE MILES EAST AND WEST OF A LINE FROM 20 MILES NORTH
NORTHEAST OF GRAND ISLAND NEBRASKA TO 40 MILES SOUTH OF ALVA
OKLAHOMA. 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 312...WW 313...

DISCUSSION...TSTMS ARE CURRENTLY DEVELOPING ALONG A COLD FRONT WHICH
STRETCHES FROM CNTRL NEB SWD INTO WRN OK. FORCING FOR ASCENT
ATTENDANT TO VORTICITY MAXIMUM PIVOTING NNEWD ACROSS THE REGION
SHOULD SUPPORT AN INCREASE IN STORM COVERAGE AND INTENSITY THROUGH
THE REMAINDER OF THE AFTERNOON. AMBIENT WARM SECTOR AIR MASS IS
CHARACTERIZED BY A GRADUALLY WARMING BOUNDARY LAYER WITH DEWPOINTS
IN THE UPPER 50S TO LOWER 60S...RESULTING IN MLCAPE VALUES OF
500-1000 J/KG. GIVEN THE SUPERPOSITION OF MID AND UPPER-LEVEL JET
AXES ALONG INSTABILITY AXIS...SETUP WILL FAVOR THE DEVELOPMENT OF
ORGANIZED STORMS...INCLUDING SUPERCELLS AND LINE SEGMENTS CAPABLE OF
HAIL AND LOCALLY DAMAGING WIND GUSTS.

AVIATION...A FEW SEVERE THUNDERSTORMS WITH HAIL SURFACE AND ALOFT
TO 2 INCHES. EXTREME TURBULENCE AND SURFACE WIND GUSTS TO 60
KNOTS. A FEW CUMULONIMBI WITH MAXIMUM TOPS TO 400. MEAN STORM
MOTION VECTOR 21025.

...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.