WATCHES: Severe Thunderstorm Watch Number 170

WWUS20 KWNS 080030
SEL0
SPC WW 080030
OKZ000-080800-

URGENT - IMMEDIATE BROADCAST REQUESTED
SEVERE THUNDERSTORM WATCH NUMBER 170
NWS STORM PREDICTION CENTER NORMAN OK
730 PM CDT MON APR 7 2008

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

NORTHERN OKLAHOMA

EFFECTIVE THIS MONDAY NIGHT AND TUESDAY MORNING FROM 730 PM UNTIL
300 AM 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 45
STATUTE MILES NORTH AND SOUTH OF A LINE FROM 40 MILES NORTH OF
CLINTON OKLAHOMA TO 65 MILES EAST NORTHEAST OF TULSA OKLAHOMA.
FOR A COMPLETE DEPICTION OF THE WATCH SEE THE ASSOCIATED WATCH
OUTLINE UPDATE (WOUS64 KWNS WOU0).

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 169...

DISCUSSION...SEVERE THUNDERSTORMS...INCLUDING SUPERCELLS...WILL
CONTINUE INCREASING IN COVERAGE ACROSS NRN AND NERN OK TONIGHT.
THIS WILL OCCUR AS SSWLY LLJ INTENSIFIES AND FUELS STRONG LOW LEVEL
WAA ALONG AND NORTH OF SURFACE FRONT NOW EXTENDING FROM NERN INTO
W-CENTRAL OK. STRONG SHEAR AND STEEP LAPSE RATES WILL COMPENSATE
FOR MODEST MUCAPE AND SUPPORT STORMS CAPABLE OF LARGE HAIL...SOME OF
WHICH COULD BE QUITE LARGE...AS ACTIVITY EVOLVES INTO A LARGER
CLUSTER/MCS AFTER DARK. ISOLATED DAMAGING WINDS AND EVEN A BRIEF
TORNADO WILL ALSO BE POSSIBLE WITH STORMS NEAR THE SURFACE FRONT
INTO THE MID/LATE EVENING.

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 24035.

..EVANS

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