Tornado Watch 260

Issued

May 1, 2011, 4:45 AM CDT (09:45 UTC)

Expired

May 1, 2011, 8:52 AM CDT

In force

4 hr

Issued by

the Storm Prediction Center

Largest hail expected

1.7 in

Strongest gust expected

60 kt

The Shreveport radar (KSHV), 131 km from the middle of the area, began a volume at 09:45 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

10%

Ten or more severe hail reports

40%

One or more hailstones of 2 inches or more

20%

Six or more combined severe hail and wind reports

70%

• Mesoscale Discussion 676May 1, 1:14 AM CDT
• Mesoscale Discussion 677May 1, 1:16 AM CDT
• Mesoscale Discussion 678May 1, 3:19 AM CDT
• Mesoscale Discussion 680May 1, 7:29 AM CDT
• Mesoscale Discussion 681May 1, 8:30 AM CDT

899 
WWUS20 KWNS 010951
SEL0
SPC WW 010951
OKZ000-TXZ000-011700-

URGENT - IMMEDIATE BROADCAST REQUESTED
TORNADO WATCH NUMBER 260
NWS STORM PREDICTION CENTER NORMAN OK
445 AM CDT SUN MAY 1 2011

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

       FAR SOUTHEAST OKLAHOMA
       NORTH-CENTRAL AND NORTHEAST TEXAS

EFFECTIVE THIS SUNDAY MORNING FROM 445 AM UNTIL NOON CDT.

TORNADOES...HAIL TO 1.7 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 55 STATUTE
MILES NORTH AND SOUTH OF A LINE FROM 50 MILES NORTHEAST OF
LONGVIEW TEXAS TO 30 MILES NORTHWEST OF CORSICANA TEXAS.  FOR A
COMPLETE DEPICTION OF THE WATCH SEE THE ASSOCIATED WATCH OUTLINE
UPDATE (WOUS64 KWNS WOU0).

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 259...

DISCUSSION...SLIGHTLY ELEVATED SUPERCELL NOW OVER SRN PART OF THE
DFW AREA APPEARS TO BE MAINTAINING ITS STRENGTH AS IT NEARS WSW-ENE
ORIENTED STNRY FRONT EXTENDING THROUGH CNTRL AND NE TX.  GIVEN
INCREASING SLY LLJ /PER KGRK VWP/ AND RICH MOISTURE IN PLACE SE OF
THE BOUNDARY...IF UPDRAFT REMAINS STRONG...POTENTIAL MAY INCREASE
FOR LOW LVL MESOCYCLONES/TORNADOES AS THE STORM CONTINUES GENERALLY
E OR ESEWD...WELL TO THE RIGHT OF MEAN FLOW.  OTHER
STRONG..POTENTIALLY SUPERCELLULAR STORMS MAY DEVELOP IN ZONE OF
STRONG WAA ALONG AND S OF THE FRONT OVER NE TX LATER THIS MORNING.

AVIATION...TORNADOES AND A FEW SEVERE THUNDERSTORMS WITH HAIL
SURFACE AND ALOFT TO 1.7 INCHES. EXTREME TURBULENCE AND SURFACE
WIND GUSTS TO 60 KNOTS. A FEW CUMULONIMBI WITH MAXIMUM TOPS TO
550. MEAN STORM MOTION VECTOR 27030.


...CORFIDI

Tornado Watches in Texas, 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.