Severe Thunderstorm Watch 310

Issued

May 30, 2007, 8:59 AM CDT (13:59 UTC)

Expired

May 30, 2007, 2:00 PM CDT

In force

5 hr

Issued by

the Storm Prediction Center

Largest hail expected

2 in

Strongest gust expected

60 kt

The Dallas/Ft Worth radar (KFWS), 126 km from the middle of the area, began a volume at 13:59 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 927May 30, 7:42 AM CDT
• Mesoscale Discussion 928May 30, 11:07 AM CDT
• Mesoscale Discussion 930May 30, 1:23 PM CDT

000
WWUS20 KWNS 301356
SEL0  
SPC WW 301356
TXZ000-301900-

URGENT - IMMEDIATE BROADCAST REQUESTED
SEVERE THUNDERSTORM WATCH NUMBER 310
NWS STORM PREDICTION CENTER NORMAN OK
855 AM CDT WED MAY 30 2007

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

       CENTRAL AND EASTERN TEXAS

EFFECTIVE THIS WEDNESDAY MORNING AND AFTERNOON FROM 855 AM UNTIL
200 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 90
STATUTE MILES EITHER SIDE OF A LINE FROM 30 MILES NORTHEAST OF
DALLAS TEXAS TO 40 MILES SOUTH SOUTHEAST OF HUNTSVILLE TEXAS. 
FOR A COMPLETE DEPICTION OF THE WATCH SEE THE ASSOCIATED WATCH
OUTLINE UPDATE (WOUS64 KWNS WOU0).

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...CONTINUE...WW 309...

DISCUSSION...BOW ECHO/DERECHO CONTINUES TO MOVE SEWD AT 40 KT.  AIR
MASS CONTINUES TO BE FAVORABLY MOIST AND UNSTABLE FOR CONVECTION TO
CONTINUE SEWD FOR THE NEXT SEVERAL HOURS.  MLCAPE VALUES ARE
1500-1800 J/KG AND ANALYSIS ALSO INDICATES DEEP LAYER SHEAR OF 30-35
KT.  MORNING RAOB ANALYSIS INDICATES REAR INFLOW JET OVER CENTRAL OK
OF 50-60 KT...THUS THREAT CONTINUES TO DAMAGING WINDS AND HAIL.

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 31035.


...MCCARTHY

Severe Thunderstorm Watches in Texas, 2007Every severe thunderstorm watch in 2007

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.