Tornado Watch 237

Issued

Apr 27, 2011, 3:29 PM CDT (20:29 UTC)

Expired

Apr 27, 2011, 8:32 PM CDT

In force

5 hr

Issued by

the Storm Prediction Center

Largest hail expected

2.5 in

Strongest gust expected

60 kt

The Paducah radar (KPAH), 21 km from the middle of the area, began a volume at 20:32 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

70%

One or more EF2 to EF5 tornadoes

40%

Ten or more severe wind reports

70%

One or more gusts of 65 knots or more

50%

Ten or more severe hail reports

60%

One or more hailstones of 2 inches or more

50%

Six or more combined severe hail and wind reports

95%

• Mesoscale Discussion 623Apr 27, 12:08 PM CDT
• Mesoscale Discussion 630Apr 27, 3:06 PM CDT
• Mesoscale Discussion 635Apr 27, 5:27 PM CDT
• Mesoscale Discussion 644Apr 27, 8:22 PM CDT

653 
WWUS20 KWNS 272027
SEL7
SPC WW 272027
ARZ000-ILZ000-INZ000-KYZ000-MOZ000-TNZ000-280400-

URGENT - IMMEDIATE BROADCAST REQUESTED
TORNADO WATCH NUMBER 237
NWS STORM PREDICTION CENTER NORMAN OK
330 PM CDT WED APR 27 2011

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

       NORTHEAST ARKANSAS
       SOUTHERN ILLINOIS
       SOUTHERN INDIANA
       WESTERN KENTUCKY
       SOUTHEAST MISSOURI INCLUDING THE BOOTHEEL
       WEST TENNESSEE

EFFECTIVE THIS WEDNESDAY AFTERNOON AND EVENING FROM 330 PM UNTIL
1100 PM CDT.

TORNADOES...HAIL TO 2.5 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 75 STATUTE
MILES EAST AND WEST OF A LINE FROM 30 MILES WEST NORTHWEST OF
EVANSVILLE INDIANA TO 45 MILES SOUTH OF JACKSON TENNESSEE.  FOR A
COMPLETE DEPICTION OF THE WATCH SEE THE ASSOCIATED WATCH OUTLINE
UPDATE (WOUS64 KWNS WOU7).

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.

OTHER WATCH INFORMATION...CONTINUE...WW 231...WW 232...WW
233...WW 234...WW 235...WW 236...

DISCUSSION...DISCRETE THUNDERSTORM DEVELOPMENT IS OCCURRING OVER
NORTHEAST AR AND WEST TN...IN REGION WHERE SUBSTANTIAL LOW LEVEL
DESTABILIZATION IS OCCURRING.  GIVEN THE APPROACH OF DEEP SURFACE
LOW...POTENTIAL IS INCREASING FOR TORNADIC SUPERCELLS AS FAR NORTH
AS THE LOWER OH RIVER VALLEY THROUGH THE EVENING.

AVIATION...TORNADOES AND 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
500. MEAN STORM MOTION VECTOR 24035.


...HART

Tornado Watches in Kentucky, 2011Tornado Watches in Illinois, 2011Tornado Watches in Tennessee, 2011Every tornado watch in 2011

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.