TORNADO WATCH: WESTERN AND CENTRAL OKLAHOMA

TORNADO WATCH NUMBER 163
NWS STORM PREDICTION CENTER NORMAN OK
835 PM CDT FRI APR 13 2012

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

WESTERN AND CENTRAL OKLAHOMA

EFFECTIVE THIS FRIDAY NIGHT AND SATURDAY MORNING FROM 835 PM
UNTIL 400 AM CDT.

TORNADOES...HAIL TO 2.5 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 75 STATUTE
MILES NORTH AND SOUTH OF A LINE FROM 45 MILES WEST NORTHWEST OF
CLINTON OKLAHOMA TO 40 MILES EAST NORTHEAST OF CHANDLER OKLAHOMA.
FOR A COMPLETE DEPICTION OF THE WATCH SEE THE ASSOCIATED WATCH
OUTLINE UPDATE (WOUS64 KWNS WOU3).

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...CONTINUE...WW 160...WW 161...WW 162...

DISCUSSION...CLUSTER OF SUPERCELLS WITH A HISTORY OF TORNADOES OVER
SWRN OK /FROM W LTS TO NW FSI/ IS EXPECTED TO TRACK ENEWD ALONG
OUTFLOW BOUNDARY INTO CNTRL OK LATER TONIGHT. CURRENT VAD
OBSERVATIONS FROM FREDRICK OK AND TWIN LAKES OK INDICATE NOTABLE
STRENGTHENING OF THE LLJ OVER THE PAST HOUR WITH 0-1 KM SRH OF
300-400 M2/S2. TORNADO THREAT WILL BE DICTATED BY ABILITY OF STORMS
TO MANAGE CONVECTIVE OUTFLOW...THOUGH SIGNIFICANT TORNADOES ARE
POSSIBLE GIVEN THE STRONG LOW-LEVEL SHEAR. ELSEWHERE...A SECONDARY
CORRIDOR OF TORNADO POTENTIAL WILL EXIST TONIGHT ACROSS PORTIONS OF
NRN OK WHERE LOW-LEVEL SHEAR AND MOISTURE ARE INCREASING WITHIN A
BOUNDARY LAYER THAT WAS NOT OVERTURNED BY EARLIER CONVECTION.

AVIATION...TORNADOES AND 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 24020. Read More