Tornado Watch 271

Issued

May 8, 2009, 3:42 PM CDT (20:42 UTC)

Expired

May 8, 2009, 11:00 PM CDT

In force

7 hr

Issued by

the Storm Prediction Center

Largest hail expected

2 in

Strongest gust expected

60 kt

Two or more tornadoes

50%

One or more EF2 to EF5 tornadoes

20%

Ten or more severe wind reports

50%

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

30%

Six or more combined severe hail and wind reports

80%

• Mesoscale Discussion 761May 8, 12:08 PM CDT
• Mesoscale Discussion 763May 8, 2:16 PM CDT
• Mesoscale Discussion 764May 8, 3:24 PM CDT
• Mesoscale Discussion 766May 8, 5:03 PM CDT
• Mesoscale Discussion 768May 8, 7:30 PM CDT
• Mesoscale Discussion 772May 8, 10:04 PM CDT
• Mesoscale Discussion 773May 8, 10:37 PM CDT

467 
WWUS20 KWNS 082040
SEL1  
SPC WW 082040
ARZ000-KYZ000-MOZ000-TNZ000-VAZ000-090400-

URGENT - IMMEDIATE BROADCAST REQUESTED
TORNADO WATCH NUMBER 271
NWS STORM PREDICTION CENTER NORMAN OK
440 PM EDT FRI MAY 8 2009

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

       PARTS OF NORTHEAST ARKANSAS
       SMALL PART OF SOUTHERN KENTUCKY
       BOOTHEEL OF MISSOURI
       MUCH  OF TENNESSEE
       SMALL PART OF WESTERN VIRGINIA

EFFECTIVE THIS FRIDAY AFTERNOON FROM 440 PM UNTIL MIDNIGHT EDT.

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 45 STATUTE
MILES NORTH AND SOUTH OF A LINE FROM 20 MILES SOUTH SOUTHWEST OF
WALNUT RIDGE ARKANSAS TO 35 MILES NORTHEAST OF BRISTOL TENNESSEE.
 FOR A COMPLETE DEPICTION OF THE WATCH SEE THE ASSOCIATED WATCH
OUTLINE UPDATE (WOUS64 KWNS WOU1).

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 267...WW 268...WW
269...WW 270...

DISCUSSION...STRONG VEERING SHEAR PROFILES COUPLE WITH A MDTLY
UNSTABLE VERY MOIST AIR MASS PROVIDING FAVORABLE CONDITIONS FOR
SUPERCELL DEVELOPMENT.  IN ADDITION TO LARGE HAIL...TORNADOES WILL
BE POSSIBLE ANY SUPERCELL BOTH ALONG OLD OUTFLOW BOUNDARY AND IN
WARM SECTOR.

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
550. MEAN STORM MOTION VECTOR 24035.


...HALES

Tornado Watches in Tennessee, 2009Tornado Watches in Kentucky, 2009Tornado Watches in Arkansas, 2009Every tornado watch in 2009

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.