Severe Thunderstorm Watch 321

Issued

May 30, 2012, 12:27 PM CDT (17:27 UTC)

Expired

May 30, 2012, 7:00 PM CDT

In force

7 hr

Issued by

the Storm Prediction Center

Largest hail expected

2 in

Strongest gust expected

60 kt

The Jackson/Brandon,MS radar (KDGX), 171 km from the middle of the area, began a volume at 17:30 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

5%

Ten or more severe wind reports

50%

One or more gusts of 65 knots or more

10%

Ten or more severe hail reports

40%

One or more hailstones of 2 inches or more

10%

Six or more combined severe hail and wind reports

70%

• Mesoscale Discussion 979May 30, 12:07 PM CDT
• Mesoscale Discussion 981May 30, 2:34 PM CDT
• Mesoscale Discussion 985May 30, 4:56 PM CDT

034 
WWUS20 KWNS 301729
SEL1
SPC WW 301729
ARZ000-LAZ000-MSZ000-310000-

URGENT - IMMEDIATE BROADCAST REQUESTED
SEVERE THUNDERSTORM WATCH NUMBER 321
NWS STORM PREDICTION CENTER NORMAN OK
1230 PM CDT WED MAY 30 2012

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

       EXTREME EAST CENTRAL AND SOUTHEAST ARKANSAS
       NORTHEAST LOUISIANA
       NORTHERN AND CENTRAL MISSISSIPPI

EFFECTIVE THIS WEDNESDAY AFTERNOON AND EVENING FROM 1230 PM UNTIL
700 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 75
STATUTE MILES EAST AND WEST OF A LINE FROM 40 MILES NORTH
NORTHWEST OF OXFORD MISSISSIPPI TO 20 MILES SOUTHWEST OF JACKSON
MISSISSIPPI.  FOR A COMPLETE DEPICTION OF THE WATCH SEE THE
ASSOCIATED WATCH OUTLINE UPDATE (WOUS64 KWNS WOU1).

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...IN ADVANCE OF A SHORT WAVE TROUGH MOVING ACROSS AR...A
BAND OF STRONG STORMS MOVING INTO ERN AR IS EXPECTED TO INTENSIFY AS
IT PROGRESSES EWD INTO AN INCREASINGLY UNSTABLE ENVIRONMENT WITH
MLCAPE TO 2000 J/KG.  ADDITIONAL STORMS ARE DEVELOPING WITHIN A
CU/TCU FIELD NEAR THE MS RIVER OVER WEST CENTRAL MS INTO NERN LA.
STORMS WILL HAVE POTENTIAL TO PRODUCE LARGE HAIL AND STRONG WIND
GUSTS THROUGH THE AFTERNOON AS THEY SPREAD EWD WITH TIME.

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 27020.


...WEISS

Severe Thunderstorm Watches in Mississippi, 2012Severe Thunderstorm Watches in Arkansas, 2012Severe Thunderstorm Watches in Louisiana, 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.