Severe Thunderstorm Watch 573

Issued

Aug 12, 2012, 3:55 PM CDT (20:55 UTC)

Expired

Aug 12, 2012, 11:00 PM CDT

In force

7 hr

Issued by

the Storm Prediction Center

Largest hail expected

2 in

Strongest gust expected

60 kt

The Dyess AFB radar (KDYX), 105 km from the middle of the area, began a volume at 20:55 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

5%

Ten or more severe wind reports

30%

One or more gusts of 65 knots or more

30%

Ten or more severe hail reports

30%

One or more hailstones of 2 inches or more

20%

Six or more combined severe hail and wind reports

70%

• Mesoscale Discussion 1743Aug 12, 3:29 PM CDT
• Mesoscale Discussion 1745Aug 12, 6:06 PM CDT
• Mesoscale Discussion 1746Aug 12, 6:28 PM CDT
• Mesoscale Discussion 1747Aug 12, 8:41 PM CDT
• Mesoscale Discussion 1748Aug 12, 10:26 PM CDT

169 
WWUS20 KWNS 122055
SEL3  
SPC WW 122055
OKZ000-TXZ000-130400-

URGENT - IMMEDIATE BROADCAST REQUESTED
SEVERE THUNDERSTORM WATCH NUMBER 573
NWS STORM PREDICTION CENTER NORMAN OK
355 PM CDT SUN AUG 12 2012

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

       SOUTHERN OKLAHOMA
       NORTH-CENTRAL TEXAS

EFFECTIVE THIS SUNDAY AFTERNOON AND EVENING FROM 355 PM UNTIL
1100 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 65
STATUTE MILES NORTH AND SOUTH OF A LINE FROM 40 MILES WEST
NORTHWEST OF ABILENE TEXAS TO 30 MILES EAST SOUTHEAST OF DURANT
OKLAHOMA.  FOR A COMPLETE DEPICTION OF THE WATCH SEE THE
ASSOCIATED WATCH OUTLINE UPDATE (WOUS64 KWNS WOU3).

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.

DISCUSSION...TSTMS SHOULD INCREASE IN COVERAGE AND INTENSITY THROUGH
THE EVENING AS A WEAK COLD FRONT DEVELOPS SOUTH INTO A VERY HOT AND
MODERATELY UNSTABLE AIRMASS. LIFT ACROSS THE FRONT MAY BE ENHANCED
AS WEAK HEIGHT FALLS ASSOCIATED WITH A SHORTWAVE TROUGH CROSSING
KS/MO BRUSH THE REGION. VERY HOT AND WELL-MIXED BOUNDARY LAYER
SHOULD PROMOTE STRONG TO DAMAGING DOWNBURST WINDS AND A FEW STORMS
MAY BECOME BETTER ORGANIZED AND PERSIST AS THE FRONT/WIND SHIFT AND
SLIGHTLY STRONGER MID LEVEL FLOW DEVELOP ACROSS THE REGION THROUGH
THE EVENING HOURS.

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 30025.


...CARBIN

Severe Thunderstorm Watches in Texas, 2012Severe Thunderstorm Watches in Oklahoma, 2012Every severe thunderstorm 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.