Severe Thunderstorm Watch 310

Issued

May 15, 2009, 7:48 PM CDT (00:48 UTC)

Expired

May 16, 2009, 12:39 AM 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), 44 km from the middle of the area, began a volume at 00:48 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

50%

One or more gusts of 65 knots or more

40%

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

80%

• Mesoscale Discussion 839May 15, 5:52 PM CDT
• Mesoscale Discussion 840May 15, 7:11 PM CDT
• Mesoscale Discussion 844May 15, 10:55 PM CDT

506 
WWUS20 KWNS 160050
SEL0  
SPC WW 160050
KSZ000-OKZ000-TXZ000-160700-

URGENT - IMMEDIATE BROADCAST REQUESTED
SEVERE THUNDERSTORM WATCH NUMBER 310
NWS STORM PREDICTION CENTER NORMAN OK
750 PM CDT FRI MAY 15 2009

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

       EXTREME SOUTHEAST KANSAS
       SOUTHWEST...CENTRAL...AND NORTHEAST OKLAHOMA
       EXTREME NORTHWEST TEXAS

EFFECTIVE THIS FRIDAY NIGHT AND SATURDAY MORNING FROM 750 PM
UNTIL 200 AM 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 80
STATUTE MILES EAST AND WEST OF A LINE FROM 25 MILES SOUTHEAST OF
CHILDRESS TEXAS TO 20 MILES WEST NORTHWEST OF SPRINGFIELD
MISSOURI.  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 305...WW 306...WW
307...WW 308...WW 309...

DISCUSSION...THE BROKEN BAND OF FRONTAL CONVECTION WILL CONTINUE TO
MOVE SEWD TOWARD THE I-44 CORRIDOR INTO THE OVERNIGHT HOURS...WHILE
OTHER DRYLINE CONVECTION SPREADS EWD INTO SW OK/NW TX.  THE 00Z OUN
SOUNDING REVEALS STRONG INSTABILITY S AND E OF THE ONGOING
STORMS...AS WELL AS A SUBSTANTIAL CAP THAT WILL REQUIRE FOCUSED
LOW-LEVEL ASCENT TO BREACH.  IT APPEARS THE MORE PROBABLE SCENARIO
IS FOR A DAMAGING WIND AND HAIL THREAT TO CONTINUE ALONG THE FRONT
FOR THE NEXT SEVERAL HOURS...WITH SOME POTENTIAL FOR MERGING
CLUSTERS TO LEAD TO DEVELOPMENT OF A BOWING MCS NEAR OR JUST S OF
THE I-40 CORRIDOR FROM WRN INTO CENTRAL OK.

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 550. MEAN STORM
MOTION VECTOR 28025.


...THOMPSON

Severe Thunderstorm Watches in Oklahoma, 2009Severe Thunderstorm Watches in Kansas, 2009Severe Thunderstorm Watches in Texas, 2009Every severe thunderstorm watch in 2009

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.