Tornado Watch 108

Issued

Apr 8, 2011, 5:35 PM CDT (22:35 UTC)

Expired

Apr 9, 2011, 3:00 AM CDT

In force

9 hr

Issued by

the Storm Prediction Center

Largest hail expected

2.5 in

Strongest gust expected

60 kt

The Vance AFB radar (KVNX), 53 km from the middle of the area, began a volume at 22:35 UTC, the scan nearest the moment this went out.

Open the radar archive at this moment

The archived warnings, watches and discussions in force at that minute are drawn over the scan, this one among them.

Two or more tornadoes

30%

One or more EF2 to EF5 tornadoes

20%

Ten or more severe wind reports

30%

One or more gusts of 65 knots or more

20%

Ten or more severe hail reports

40%

One or more hailstones of 2 inches or more

30%

Six or more combined severe hail and wind reports

80%

• Mesoscale Discussion 371Apr 8, 2:26 PM CDT
• Mesoscale Discussion 376Apr 8, 8:32 PM CDT
• Mesoscale Discussion 377Apr 8, 11:01 PM CDT
• Mesoscale Discussion 380Apr 9, 1:52 AM CDT

279 
WWUS20 KWNS 082237
SEL8
SPC WW 082237
KSZ000-OKZ000-090600-

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.


...CORFIDI

Tornado Watches in Oklahoma, 2011Tornado Watches in Kansas, 2011Every tornado watch in 2011

The product and its follow-ups from the Iowa Environmental Mesonet's archive of National Weather Service and Storm Prediction Center text; the sounding from the Mesonet's radiosonde archive; radar from the NEXRAD Level II archive.