WATCHES: Severe Thunderstorm Watch Number 525

WWUS20 KWNS 202046
SEL5
SPC WW 202046
OKZ000-TXZ000-210400-

URGENT - IMMEDIATE BROADCAST REQUESTED
SEVERE THUNDERSTORM WATCH NUMBER 525
NWS STORM PREDICTION CENTER NORMAN OK
345 PM CDT MON JUN 20 2011

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

MUCH OF CENTRAL OKLAHOMA
MUCH OF NORTHWEST TEXAS

EFFECTIVE THIS MONDAY AFTERNOON AND EVENING FROM 345 PM UNTIL
1100 PM CDT.

...THIS IS A PARTICULARLY DANGEROUS SITUATION...

EXTREMELY DAMAGING THUNDERSTORM WIND GUSTS TO 80 MPH...LARGE HAIL
TO 3.5 INCHES IN DIAMETER...AND DANGEROUS LIGHTNING ARE POSSIBLE
IN THESE AREAS.

THE SEVERE THUNDERSTORM WATCH AREA IS APPROXIMATELY ALONG AND 55
STATUTE MILES EAST AND WEST OF A LINE FROM 25 MILES NORTHEAST OF
PONCA CITY OKLAHOMA TO 45 MILES WEST OF STEPHENVILLE TEXAS. FOR
A COMPLETE DEPICTION OF THE WATCH SEE THE ASSOCIATED WATCH
OUTLINE UPDATE (WOUS64 KWNS WOU5).

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 523...WW 524...

DISCUSSION...THUNDERSTORMS SHOULD DEVELOP ALONG THE DRY LINE ON WRN
EDGE OF WATCH BY 22Z. STORMS WILL RAPIDLY BECOME SEVERE GIVEN THE
AVAILABLE VERY UNSTABLE AIR MASS IN ADVANCE OF THE UNSEASONABLY
STRONG UPPER TROUGH . SUPERCELLS WILL BE INITIAL MODE BUT QUICKLY
EVOLVE INTO LINE SEGMENTS AND BOWS. VERY LARGE HAIL ALONG WITH A
POTENTIAL OF SIGNIFICANT DAMAGING WINDS WILL ACCOMPANY BOTH THE
SUPERCELLS AND THE MORE LINEAR MODE THAT EVOLVES BY THIS EVENING. IN
ADDITION BRIEF TORNADOS ARE POSSIBLE WITH BOTH MODES

AVIATION...A FEW SEVERE THUNDERSTORMS WITH HAIL SURFACE AND ALOFT
TO 3.5 INCHES. EXTREME TURBULENCE AND SURFACE WIND GUSTS TO 70
KNOTS. A FEW CUMULONIMBI WITH MAXIMUM TOPS TO 550. MEAN STORM
MOTION VECTOR 24030.

...HALES

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