Tornado Watch 143

Issued

Apr 15, 2011, 2:09 PM CDT (19:09 UTC)

Expired

Apr 15, 2011, 9:00 PM CDT

In force

7 hr

Issued by

the Storm Prediction Center

Largest hail expected

2 in

Strongest gust expected

60 kt

The Memphis radar (KNQA), 55 km from the middle of the area, began a volume at 19:11 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

50%

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

50%

One or more hailstones of 2 inches or more

40%

Six or more combined severe hail and wind reports

80%

• Mesoscale Discussion 437Apr 15, 12:29 PM CDT
• Mesoscale Discussion 438Apr 15, 1:30 PM CDT
• Mesoscale Discussion 439Apr 15, 3:32 PM CDT
• Mesoscale Discussion 440Apr 15, 3:35 PM CDT
• Mesoscale Discussion 442Apr 15, 5:57 PM CDT
• Mesoscale Discussion 447Apr 15, 8:15 PM CDT

300 
WWUS20 KWNS 151911
SEL3
SPC WW 151911
ARZ000-MOZ000-MSZ000-TNZ000-160200-

URGENT - IMMEDIATE BROADCAST REQUESTED
TORNADO WATCH NUMBER 143
NWS STORM PREDICTION CENTER NORMAN OK
210 PM CDT FRI APR 15 2011

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

       NORTHEAST ARKANSAS
       MISSOURI BOOTHEEL
       NORTHERN MISSISSIPPI
       WESTERN TENNESSEE

EFFECTIVE THIS FRIDAY AFTERNOON AND EVENING FROM 210 PM UNTIL 900
PM CDT.

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 90 STATUTE
MILES EAST AND WEST OF A LINE FROM 50 MILES NORTHEAST OF
DYERSBURG TENNESSEE TO 40 MILES SOUTH SOUTHEAST OF OXFORD
MISSISSIPPI.  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.

OTHER WATCH INFORMATION...CONTINUE...WW 140...WW 141...WW 142...

DISCUSSION...TSTMS ARE EXPECTED TO INCREASE IN COVERAGE AND
INTENSITY THIS AFTERNOON ALONG COLD FRONT AS DEEP ASCENT IN EXIT
REGION OF MID AND UPPER-LEVEL JET STREAKS MOVES INTO THE REGION.
THE COMBINATION OF STRONG DAYTIME HEATING...BOUNDARY LAYER DEWPOINTS
OF 55-60 F AND COOLING MIDLEVEL TEMPERATURES WILL SUPPORT FURTHER
AIR MASS DESTABILIZATION WITH MLCAPE VALUES APPROACHING 1000-1500
J/KG.  WHEN COUPLED WITH VERTICALLY-VEERING WIND
PROFILES...ENVIRONMENT WILL BE SUPPORTIVE OF SUPERCELLS AND BOWING
STRUCTURES WILL A RISK FOR TORNADOES...LARGE HAIL AND DAMAGING
WINDS.

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
400. MEAN STORM MOTION VECTOR 24030.


...MEAD

Tornado Watches in Tennessee, 2011Tornado Watches in Mississippi, 2011Tornado Watches in Arkansas, 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.