Severe Thunderstorm Watch 20

Issued

Feb 1, 2012, 12:37 PM CST (18:37 UTC)

Expired

Feb 1, 2012, 5:29 PM CST

In force

5 hr

Issued by

the Storm Prediction Center

Largest hail expected

2 in

Strongest gust expected

60 kt

The Little Rock radar (KLZK), 141 km from the middle of the area, began a volume at 18:39 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

60%

One or more hailstones of 2 inches or more

20%

Six or more combined severe hail and wind reports

80%

• Mesoscale Discussion 84Feb 1, 10:18 AM CST
• Mesoscale Discussion 85Feb 1, 1:22 PM CST
• Mesoscale Discussion 87Feb 1, 2:58 PM CST

070 
WWUS20 KWNS 011833
SEL0
SPC WW 011833
ARZ000-LAZ000-OKZ000-TXZ000-020200-

URGENT - IMMEDIATE BROADCAST REQUESTED
SEVERE THUNDERSTORM WATCH NUMBER 20
NWS STORM PREDICTION CENTER NORMAN OK
1235 PM CST WED FEB 1 2012

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

       CENTRAL AND SOUTHERN ARKANSAS
       NORTHERN LOUISIANA
       EXTREME SOUTHEAST OKLAHOMA
       NORTHEAST TEXAS

EFFECTIVE THIS WEDNESDAY AFTERNOON AND EVENING FROM 1235 PM UNTIL
800 PM CST.

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 95
STATUTE MILES NORTH AND SOUTH OF A LINE FROM 60 MILES SOUTHWEST
OF DE QUEEN ARKANSAS TO 50 MILES EAST NORTHEAST OF PINE BLUFF
ARKANSAS.  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.

DISCUSSION...A CLUSTER OF THUNDERSTORMS OVER SOUTHEAST OK WILL
SPREAD EASTWARD INTO AR...WHILE NEW STORMS POTENTIALLY DEVELOPING
SOUTHWARD INTO NORTHEAST TX.  STEEP MID LEVEL LAPSE RATES AND
MODERATE CAPE VALUES WILL PROMOTE THE RISK OF A FEW INTENSE CELLS
CAPABLE OF LARGE HAIL AND GUSTY WINDS.

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 400. MEAN STORM
MOTION VECTOR 27035.


...HART

Severe Thunderstorm Watches in Arkansas, 2012Severe Thunderstorm Watches in Texas, 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.