Tornado Watch 154

Issued

Apr 9, 2012, 6:27 PM CDT (23:27 UTC)

Expired

Apr 10, 2012, 2:00 AM CDT

In force

8 hr

Issued by

the Storm Prediction Center

Largest hail expected

4 in

Strongest gust expected

65 kt

The Altus AFB radar (KFDR), 146 km from the middle of the area, began a volume at 23:30 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

40%

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

90%

One or more hailstones of 2 inches or more

70%

Six or more combined severe hail and wind reports

95%

• Mesoscale Discussion 479Apr 9, 3:06 PM CDT
• Mesoscale Discussion 481Apr 9, 5:37 PM CDT
• Mesoscale Discussion 484Apr 9, 8:54 PM CDT
• Mesoscale Discussion 486Apr 10, 12:52 AM CDT

764 
WWUS20 KWNS 092333
SEL4
SPC WW 092333
OKZ000-TXZ000-100700-

URGENT - IMMEDIATE BROADCAST REQUESTED
TORNADO WATCH NUMBER 154
NWS STORM PREDICTION CENTER NORMAN OK
630 PM CDT MON APR 9 2012

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

       WESTERN OKLAHOMA
       WESTERN NORTH TEXAS

EFFECTIVE THIS MONDAY NIGHT AND TUESDAY MORNING FROM 630 PM UNTIL
200 AM CDT.

TORNADOES...HAIL TO 4 INCHES IN DIAMETER...THUNDERSTORM WIND
GUSTS TO 75 MPH...AND DANGEROUS LIGHTNING ARE POSSIBLE IN THESE
AREAS.

THE TORNADO WATCH AREA IS APPROXIMATELY ALONG AND 50 STATUTE
MILES EAST AND WEST OF A LINE FROM 25 MILES WEST NORTHWEST OF
ALVA OKLAHOMA TO 40 MILES WEST SOUTHWEST OF WICHITA FALLS TEXAS.
FOR A COMPLETE DEPICTION OF THE WATCH SEE THE ASSOCIATED WATCH
OUTLINE UPDATE (WOUS64 KWNS WOU4).

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 151...WW 152...WW 153...

DISCUSSION...SUPERCELL COMPLEX NOW NEAR WOODWARD OK...WITH VERY
LARGE HAIL AND RECENT TORNADOES...EXPECTED TO MOVE GENERALLY
SSE...INTO ENVIRONMENT THAT WILL REMAIN SUPPORTIVE OF A CONTINUED
LARGE HAIL/OCCASIONAL TORNADO THREAT.  FARTHER SSW...CONFIGURATION
OF STORMS IN SE TX PANHANDLE HAS EVOLVED IN SUCH A WAY THAT
ASSOCIATED COLD POOL IS NOT VERY LARGE/STRONG.  AS THE MAIN
STORM...AND SMALLER CELLS AHEAD OF IT...CONTINUE SEWD...THE ACTIVITY
WILL ENCOUNTER AN INCREASINGLY FAVORABLE LOW LVL ENVIRONMENT
/MOISTURE AND BACKED SFC FLOW/ FOR TORNADOES...IN ADDITION TO LARGE
HAIL.  THIS THREAT MAY CONTINUE WELL AFTER DARK AS LLJ IS EXPECTED
TO SOMEWHAT STRENGTHEN AND VEER ACROSS THE REGION.

AVIATION...TORNADOES AND A FEW SEVERE THUNDERSTORMS WITH HAIL
SURFACE AND ALOFT TO 4 INCHES. EXTREME TURBULENCE AND SURFACE
WIND GUSTS TO 65 KNOTS. A FEW CUMULONIMBI WITH MAXIMUM TOPS TO
550. MEAN STORM MOTION VECTOR 30020.


...CORFIDI

Tornado Watches in Oklahoma, 2012Tornado Watches in Texas, 2012Every tornado watch in 2012

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.