Severe Thunderstorm Watch 261

Issued

May 1, 2011, 8:45 AM CDT (13:45 UTC)

Expired

May 1, 2011, 3:00 PM CDT

In force

6 hr

Issued by

the Storm Prediction Center

Largest hail expected

2 in

Strongest gust expected

60 kt

The Dallas/Ft Worth radar (KFWS), 143 km from the middle of the area, began a volume at 13:46 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

20%

One or more EF2 to EF5 tornadoes

2%

Ten or more severe wind reports

40%

One or more gusts of 65 knots or more

30%

Ten or more severe hail reports

60%

One or more hailstones of 2 inches or more

30%

Six or more combined severe hail and wind reports

80%

• Mesoscale Discussion 680May 1, 7:29 AM CDT
• Mesoscale Discussion 681May 1, 8:30 AM CDT
• Mesoscale Discussion 682May 1, 12:12 PM CDT

874 
WWUS20 KWNS 011346
SEL1
SPC WW 011346
ARZ000-OKZ000-TXZ000-012000-

URGENT - IMMEDIATE BROADCAST REQUESTED
SEVERE THUNDERSTORM WATCH NUMBER 261
NWS STORM PREDICTION CENTER NORMAN OK
845 AM CDT SUN MAY 1 2011

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

       SOUTHWEST ARKANSAS
       SMALL PART OF SOUTHEAST OKLAHOMA
       PARTS OF NORTH CENTRAL AND NORTHEAST TEXAS

EFFECTIVE THIS SUNDAY MORNING AND AFTERNOON FROM 845 AM UNTIL 300
PM CDT.

HAIL TO 2 INCHES IN DIAMETER...THUNDERSTORM WIND GUSTS TO 70
MPH...AND DANGEROUS LIGHTNING ARE POSSIBLE IN THESE AREAS.

THE SEVERE THUNDERSTORM WATCH AREA IS APPROXIMATELY ALONG AND 45
STATUTE MILES NORTH AND SOUTH OF A LINE FROM 45 MILES SOUTHWEST
OF FORT WORTH TEXAS TO 70 MILES EAST NORTHEAST OF TEXARKANA
ARKANSAS.  FOR A COMPLETE DEPICTION OF THE WATCH SEE THE
ASSOCIATED WATCH OUTLINE UPDATE (WOUS64 KWNS WOU1).

REMEMBER...A SEVERE THUNDERSTORM WATCH MEANS CONDITIONS ARE
FAVORABLE FOR 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. SEVERE THUNDERSTORMS CAN AND OCCASIONALLY
DO PRODUCE TORNADOES.

OTHER WATCH INFORMATION...THIS SEVERE THUNDERSTORM WATCH REPLACES
SEVERE THUNDERSTORM WATCH NUMBER 259...TORNADO WATCH NUMBER 260.
WATCH NUMBER 259 260 WILL NOT BE IN EFFECT AFTER 845 AM CDT.

DISCUSSION...STRONG/SEVERE THUNDERSTORMS WILL CONTINUE TO BE A
THREAT ALONG AND N OF NEARLY STATIONARY FRONTAL ZONE FROM SWRN AR TO
S OF DAL/FTW AREA.  WITH 50KT OF BRN SHEAR COUPLED WITH A VERY
MOIST/MDTLY UNSTABLE WARM SECTOR BEING LIFTED ACROSS
BOUNDARY..CONDITIONS ARE FAVORABLE FOR LINE SEGMENTS/ELEVATED
SUPERCELLS TO CONTINUE TRACKING ENEWD THRU THE WATCH AREA THRU EARLY
TO MID AFTERNOON. PRIMARY THREAT WILL BE LARGE HAIL AND DAMAGING
WIND WITH TORNADO POTENTIAL POSSIBLY INCREASING NEARER THE BOUNDARY
BY MID AFTERNOON.

AVIATION...A FEW SEVERE THUNDERSTORMS WITH HAIL SURFACE AND ALOFT
TO 2 INCHES. EXTREME TURBULENCE AND SURFACE WIND GUSTS TO 60
KNOTS. A FEW CUMULONIMBI WITH MAXIMUM TOPS TO 500. MEAN STORM
MOTION VECTOR 26035.


...HALES

Severe Thunderstorm Watches in Texas, 2011Severe Thunderstorm Watches in Arkansas, 2011Every severe thunderstorm 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.