Tornado Watch 3

Issued

Jan 12, 2013, 5:20 PM CST (23:20 UTC)

Expired

Jan 13, 2013, 12:00 AM CST

In force

7 hr

Issued by

the Storm Prediction Center

Largest hail expected

1 in

Strongest gust expected

65 kt

The Little Rock radar (KLZK), 44 km from the middle of the area, began a volume at 23:21 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

40%

Ten or more severe wind reports

30%

One or more gusts of 65 knots or more

30%

Ten or more severe hail reports

5%

One or more hailstones of 2 inches or more

5%

Six or more combined severe hail and wind reports

70%

• Mesoscale Discussion 15Jan 12, 1:25 PM CST
• Mesoscale Discussion 18Jan 12, 6:18 PM CST
• Mesoscale Discussion 20Jan 12, 9:25 PM CST
• Mesoscale Discussion 21Jan 12, 10:33 PM CST

580 
WWUS20 KWNS 122322
SEL3
SPC WW 122322
ARZ000-MOZ000-130600-

URGENT - IMMEDIATE BROADCAST REQUESTED
TORNADO WATCH NUMBER 3
NWS STORM PREDICTION CENTER NORMAN OK
520 PM CST SAT JAN 12 2013

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

       SOUTHWESTERN THROUGH CENTRAL AND NORTHEASTERN ARKANSAS
       BOOT-HEEL OF EXTREME SOUTHEASTERN MISSOURI

EFFECTIVE THIS SATURDAY AFTERNOON FROM 520 PM UNTIL MIDNIGHT CST.

TORNADOES...HAIL TO 1 INCH IN DIAMETER...THUNDERSTORM WIND GUSTS
TO 75 MPH...AND DANGEROUS LIGHTNING ARE POSSIBLE IN THESE AREAS.

THE TORNADO WATCH AREA IS APPROXIMATELY ALONG AND 70 STATUTE
MILES EAST AND WEST OF A LINE FROM 70 MILES SOUTH SOUTHWEST OF
HOT SPRINGS ARKANSAS TO 20 MILES NORTH NORTHEAST OF WALNUT RIDGE
ARKANSAS.  FOR A COMPLETE DEPICTION OF THE WATCH SEE THE
ASSOCIATED WATCH OUTLINE UPDATE (WOUS64 KWNS WOU3).

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...GRADUAL INCREASE IN SVR THREAT AND POTENTIAL FOR A FEW
TORNADOES IS EXPECTED THROUGH NEXT FEW HOURS AS FRONTAL-WAVE LOW
MOVES NEWD ALONG SW-NE ALIGNED BOUNDARY...IN ENVIRONMENT
CHARACTERIZED BY
1. STRENGTHENING LOW-LEVEL SHEAR ASSOCIATED WITH 55-65 KT LLJ AND
2. AT LEAST MRGL BUOYANCY WITH WARM-SECTOR MLCAPE 250-750
K/KG...BASED ON MODIFIED MSU MOBILE SOUNDING PROVIDED VIA WFO MEG.

AVIATION...TORNADOES AND A FEW SEVERE THUNDERSTORMS WITH HAIL
SURFACE AND ALOFT TO 1 INCH. EXTREME TURBULENCE AND SURFACE WIND
GUSTS TO 65 KNOTS. A FEW CUMULONIMBI WITH MAXIMUM TOPS TO 450.
MEAN STORM MOTION VECTOR 23040.


...EDWARDS

Tornado Watches in Arkansas, 2013Tornado Watches in Missouri, 2013Every tornado watch in 2013

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.