URGENT - IMMEDIATE BROADCAST REQUESTED
TORNADO WATCH NUMBER 108
NWS STORM PREDICTION CENTER NORMAN OK
535 PM CDT FRI APR 8 2011
THE NWS STORM PREDICTION CENTER HAS ISSUED A TORNADO WATCH FOR PORTIONS OF SOUTH CENTRAL INTO
EAST CENTRAL KANSAS WESTERN AND NORTHERN OKLAHOMA EFFECTIVE THIS FRIDAY AFTERNOON AND SATURDAY
MORNING FROM 535 PM UNTIL 100 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 65 STATUTE MILES NORTH AND SOUTH OF A LINE FROM 35 MILES NORTH
OF CLINTON OKLAHOMA TO 25 MILES EAST NORTHEAST OF CHANUTE KANSAS.
FOR A COMPLETE DEPICTION OF THE WATCH SEE THE ASSOCIATED WATCH OUTLINE
UPDATE (WOUS64 KWNS WOU8).
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 106...WW 107...
DISCUSSION...TSTMS HAVE FORMED IN THE PAST HALF HOUR ALONG LOW-LVL CONFLUENCE AXIS OVER N
CNTRL OK. TWRG CU EXTEND SSW FROM THAT AREA ALONG DRY LINE INTO SW OK. SFC-BASED CU ALSO ARE
APPARENT ALONG W/E FRONT OVER S CNTRL/E CNTRL KS. DESPITE APPARENT RIDGING ALOFT /PER
WV IMAGERY/...COMBINATION OF STRONG INSTABILITY AND LOW-LVL CONFLUENCE MAY SUPPORT SUSTAINED
STORMS/POSSIBLE SUPERCELLS WITH LARGE HAIL/LOCALLY DMGG WIND THROUGH LATE EVE. WHILE LOW-LVL
SHEAR ATTM IS SOMEWHAT MARGINAL FOR TORNADOES...EXPECTED STRENGTHENING OF 850-700 MB FLOW
AFTER DARK INTERACTING WITH EXISTING SUSTAINED STORMS MAY YIELD A THREAT FOR TORNADOES.
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
550. MEAN STORM MOTION VECTOR 24025.
