Severe Thunderstorm Watch 377

Issued

Jun 11, 2012, 9:25 PM CDT (02:25 UTC)

Expired

Jun 12, 2012, 4:00 AM CDT

In force

7 hr

Issued by

the Storm Prediction Center

Largest hail expected

2.5 in

Strongest gust expected

60 kt

Counties Atoka County, OK, Bryan County, OK, Carter County, OK, Choctaw County, OK, Coal County, OK, Haskell County, OK, Jefferson County, OK, Johnston County, OK, Latimer County, OK, LeFlore County, OK, Love County, OK, Marshall County, OK, Murray County, OK, Pittsburg County, OK, Pontotoc County, OK, Pushmataha County, OK

The Norman radar (KTLX), 142 km from the middle of the area, began a volume at 02:29 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

10%

One or more EF2 to EF5 tornadoes

2%

Ten or more severe wind reports

30%

One or more gusts of 65 knots or more

30%

Ten or more severe hail reports

40%

One or more hailstones of 2 inches or more

50%

Six or more combined severe hail and wind reports

70%

• Mesoscale Discussion 1130Jun 11, 7:38 PM CDT
• Mesoscale Discussion 1133Jun 11, 11:29 PM CDT

311 
WWUS20 KWNS 120225
SEL7  
SPC WW 120225
ARZ000-OKZ000-120900-

URGENT - IMMEDIATE BROADCAST REQUESTED
SEVERE THUNDERSTORM WATCH NUMBER 377
NWS STORM PREDICTION CENTER NORMAN OK
925 PM CDT MON JUN 11 2012

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

       EXTREME WEST CENTRAL ARKANSAS
       SOUTH CENTRAL AND SOUTHEAST OKLAHOMA

EFFECTIVE THIS MONDAY NIGHT AND TUESDAY MORNING FROM 925 PM UNTIL
400 AM CDT.

HAIL TO 2.5 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 20 MILES SOUTH
SOUTHWEST OF ARDMORE OKLAHOMA TO 10 MILES EAST SOUTHEAST OF
POTEAU OKLAHOMA.  FOR A COMPLETE DEPICTION OF THE WATCH SEE THE
ASSOCIATED WATCH OUTLINE UPDATE (WOUS64 KWNS WOU7).

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 374...WW 375...WW 376...

DISCUSSION...SEVERE STORMS IN N TX WILL LIKELY SPREAD ENEWD INTO S
CENTRAL OK...ALONG A SLOW-MOVING FRONT...WITH ADDITIONAL DEVELOPMENT
POSSIBLE ALONG THE FRONT INTO E CENTRAL/SE OK.  A RESERVOIR OF
STRONG INSTABILITY REMAINS ALONG AND S OF THE FRONT...IN AN
ENVIRONMENT WITH SUFFICIENT DEEP-LAYER VERTICAL SHEAR FOR
SUPERCELLS.  THUS...THE DEVELOPING STORMS WILL POSE A RISK FOR LARGE
HAIL /SOME OF WHICH COULD EXCEED 2 INCHES IN DIAMETER/...AS WELL AS
DAMAGING GUSTS.

AVIATION...A FEW SEVERE THUNDERSTORMS WITH HAIL SURFACE AND ALOFT
TO 2.5 INCHES. EXTREME TURBULENCE AND SURFACE WIND GUSTS TO 60
KNOTS. A FEW CUMULONIMBI WITH MAXIMUM TOPS TO 550. MEAN STORM
MOTION VECTOR 27020.


...THOMPSON

Severe 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.