Tornado Watch 89

Issued

Apr 4, 2011, 7:22 AM CDT (12:22 UTC)

Expired

Apr 4, 2011, 2:45 PM CDT

In force

7 hr

Issued by

the Storm Prediction Center

Largest hail expected

1.5 in

Strongest gust expected

60 kt

The Memphis radar (KNQA), 76 km from the middle of the area, began a volume at 12:25 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

80%

One or more gusts of 65 knots or more

40%

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

90%

• Mesoscale Discussion 341Apr 4, 5:48 AM CDT
• Mesoscale Discussion 342Apr 4, 6:53 AM CDT
• Mesoscale Discussion 343Apr 4, 10:25 AM CDT

498 
WWUS20 KWNS 041226
SEL9
SPC WW 041226
ARZ000-ILZ000-INZ000-KYZ000-MOZ000-MSZ000-TNZ000-042000-

URGENT - IMMEDIATE BROADCAST REQUESTED
TORNADO WATCH NUMBER 89
NWS STORM PREDICTION CENTER NORMAN OK
725 AM CDT MON APR 4 2011

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

       CENTRAL AND EASTERN ARKANSAS
       SOUTHERN ILLINOIS
       SOUTHERN INDIANA
       WESTERN KENTUCKY
       SOUTHEAST MISSOURI
       NORTHERN MISSISSIPPI
       WESTERN TENNESSEE

EFFECTIVE THIS MONDAY MORNING AND AFTERNOON FROM 725 AM UNTIL 300
PM CDT.

TORNADOES...HAIL TO 1.5 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 115 STATUTE
MILES EAST AND WEST OF A LINE FROM 20 MILES SOUTH SOUTHWEST OF
PINE BLUFF ARKANSAS TO 35 MILES NORTH NORTHEAST OF EVANSVILLE
INDIANA.  FOR A COMPLETE DEPICTION OF THE WATCH SEE THE
ASSOCIATED WATCH OUTLINE UPDATE (WOUS64 KWNS WOU9).

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 87...WW 88...

DISCUSSION...TSTMS ARE GRADUALLY INTENSIFYING THIS MORNING ALONG AND
AHEAD OF COLD FRONT FROM AR INTO WRN KY.  12Z LIT SOUNDING SHOWED
THAT STRONG CAP WHICH WAS OBSERVED BY 04/00Z SOUNDINGS HAD BEEN
REMOVED...YIELDING AND MOIST AND STRONGLY SHEARED AIR MASS.  EXPECT
A COMBINATION OF LINE SEGMENTS AND SUPERCELLS TO EVOLVE WITH A
THREAT FOR DAMAGING WINDS...HAIL AND TORNADOES.  UPSCALE GROWTH INTO
A QLCS IS ANTICIPATED LATER TODAY WITH THE PRIMARY HAZARD
TRANSITIONING TO PRIMARILY DAMAGING WINDS.

AVIATION...TORNADOES AND A FEW SEVERE THUNDERSTORMS WITH HAIL
SURFACE AND ALOFT TO 1.5 INCHES. EXTREME TURBULENCE AND SURFACE
WIND GUSTS TO 60 KNOTS. A FEW CUMULONIMBI WITH MAXIMUM TOPS TO
500. MEAN STORM MOTION VECTOR 25040.


...MEAD

Tornado Watches in Arkansas, 2011Tornado Watches in Kentucky, 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.