Tornado Watch 252

Issued

May 7, 2007, 10:51 AM CDT (15:51 UTC)

Expired

May 7, 2007, 4:18 PM CDT

In force

5 hr

Issued by

the Storm Prediction Center

Largest hail expected

2 in

Strongest gust expected

60 kt

The Norman radar (KTLX), 126 km from the middle of the area, began a volume at 15:54 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

30%

Ten or more severe hail reports

50%

One or more hailstones of 2 inches or more

30%

Six or more combined severe hail and wind reports

70%

• Mesoscale Discussion 741May 7, 10:29 AM CDT

000
WWUS20 KWNS 071553
SEL2  
SPC WW 071553
OKZ000-TXZ000-072300-

URGENT - IMMEDIATE BROADCAST REQUESTED
TORNADO WATCH NUMBER 252
NWS STORM PREDICTION CENTER NORMAN OK
1050 AM CDT MON MAY 7 2007

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

       SOUTH CENTRAL AND SOUTHEAST OKLAHOMA
       NORTH CENTRAL TEXAS

EFFECTIVE THIS MONDAY MORNING AND EVENING FROM 1050 AM UNTIL 600
PM CDT.

TORNADOES...HAIL TO 2 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 60 STATUTE
MILES NORTH AND SOUTH OF A LINE FROM 70 MILES WEST SOUTHWEST OF
ARDMORE OKLAHOMA TO 50 MILES NORTH NORTHEAST OF PARIS TEXAS.  FOR
A COMPLETE DEPICTION OF THE WATCH SEE THE ASSOCIATED WATCH
OUTLINE UPDATE (WOUS64 KWNS WOU2).

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.

DISCUSSION...ONGOING STRONG TO SEVERE THUNDERSTORMS EXPECTED TO
CONTINUE INCREASING IN COVERAGE AND INTENSITY ALONG NOSE OF
WEAKENING LLJ TODAY.  SURFACE HEATING WILL BOOST MLCAPE AND WEAKEN
CAP DURING THE NEXT FEW HOURS...WITH MLCAPE FROM 1500-2500 J/KG
EXPECTED BY THE EARLY AFTERNOON ALONG THE RED RIVER VALLEY.  DEEP
LAYER SHEAR WILL REMAIN MARGINAL FOR SUSTAINED SUPERCELLS. 
HOWEVER...STRONG LOW LEVEL SHEAR AND FAVORABLE LOW LEVEL
THERMODYNAMICS WILL SUPPORT AT LEAST A RISK OF BRIEF-LIVED
TORNADOES.  LARGE HAIL AND DAMAGING WINDS WILL ALSO BECOME COMMON
WITH THE STRONGER STORMS.

AVIATION...TORNADOES AND 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 22025.


...EVANS

Tornado Watches in Oklahoma, 2007Tornado Watches in Texas, 2007Every tornado 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.