Tornado Watch 734

Issued

Nov 21, 2007, 12:47 PM CST (18:47 UTC)

Expired

Nov 21, 2007, 7:04 PM CST

In force

6 hr

Issued by

the Storm Prediction Center

Largest hail expected

2 in

Strongest gust expected

60 kt

The Memphis radar (KNQA), 145 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

40%

One or more EF2 to EF5 tornadoes

20%

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

30%

Six or more combined severe hail and wind reports

80%

• Mesoscale Discussion 2149Nov 21, 11:17 AM CST
• Mesoscale Discussion 2153Nov 21, 3:18 PM CST
• Mesoscale Discussion 2156Nov 21, 6:43 PM CST

000
WWUS20 KWNS 211847
SEL4  
SPC WW 211847
ARZ000-ILZ000-MOZ000-220200-

URGENT - IMMEDIATE BROADCAST REQUESTED
TORNADO WATCH NUMBER 734
NWS STORM PREDICTION CENTER NORMAN OK
1250 PM CST WED NOV 21 2007

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

       MUCH OF SOUTHERN AND EASTERN ARKANSAS
       PARTS OF SOUTHERN ILLINOIS
       PARTS OF SOUTHEASTERN MISSOURI

EFFECTIVE THIS WEDNESDAY AFTERNOON AND EVENING FROM 1250 PM UNTIL
800 PM CST.

TORNADOES...HAIL TO 2 INCHES IN DIAMETER...THUNDERSTORM WIND
GUSTS TO 70 MPH...AND DANGEROUS LIGHTNING ARE POSSIBLE IN THESE
AREAS.

THE TORNADO WATCH AREA IS APPROXIMATELY ALONG AND 80 STATUTE
MILES EAST AND WEST OF A LINE FROM 30 MILES NORTH OF CAPE
GIRARDEAU MISSOURI TO 70 MILES SOUTH OF HOT SPRINGS ARKANSAS. 
FOR A COMPLETE DEPICTION OF THE WATCH SEE THE ASSOCIATED WATCH
OUTLINE UPDATE (WOUS64 KWNS WOU4).

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...AIR MASS AHEAD OF STRONG COLD FRONT HAS CONTINUED TO
DESTABILIZE WITH STORMS NOW DEVELOPING.  WITH SHEAR PROFILES
FAVORABLE FOR SUPERCELLS AND APPROACH OF VIGOROUS TROUGH AND WIND
MAX FROM CENTRAL PLAINS...POTENTIAL FOR SEVERE THUNDERSTORMS
INCLUDING SUPERCELL TORNADOES WILL INCREASE ALONG AND E OF FRONT
REMAINDER OF AFTERNOON.

AVIATION...TORNADOES AND 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
500. MEAN STORM MOTION VECTOR 24030.


...HALES

Tornado Watches in Arkansas, 2007Tornado Watches in Missouri, 2007Tornado Watches in Illinois, 2007Every tornado watch in 2007

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.