Tornado Watch 227

Issued

Apr 27, 2011, 5:07 AM CDT (10:07 UTC)

Expired

Apr 27, 2011, 10:00 AM CDT

In force

5 hr

Issued by

the Storm Prediction Center

Largest hail expected

1.5 in

Strongest gust expected

60 kt

The Louisville radar (KLVX), 92 km from the middle of the area, began a volume at 10:08 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

10%

One or more hailstones of 2 inches or more

5%

Six or more combined severe hail and wind reports

60%

• Mesoscale Discussion 614Apr 27, 4:33 AM CDT

476 
WWUS20 KWNS 271007
SEL7
SPC WW 271007
KYZ000-TNZ000-271500-

URGENT - IMMEDIATE BROADCAST REQUESTED
TORNADO WATCH NUMBER 227
NWS STORM PREDICTION CENTER NORMAN OK
510 AM CDT WED APR 27 2011

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

       CENTRAL KENTUCKY
       MIDDLE AND SOUTHEASTERN TENNESSEE

EFFECTIVE THIS WEDNESDAY MORNING FROM 510 AM UNTIL 1000 AM 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 55 STATUTE
MILES EAST AND WEST OF A LINE FROM 30 MILES NORTH NORTHEAST OF
LEXINGTON KENTUCKY TO 50 MILES SOUTH OF NASHVILLE 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...THIS TORNADO WATCH REPLACES TORNADO
WATCH NUMBER 224. WATCH NUMBER 224 WILL NOT BE IN EFFECT AFTER
510 AM CDT. CONTINUE...WW 225...WW 226...

DISCUSSION...SQUALL LINE WITH EMBEDDED SUPERCELL AND BOWING
STRUCTURES WILL ADVANCE EWD THROUGH CNTRL KY AND MIDDLE TN DURING
THE EARLY MORNING. INSTABILITY IS MARGINAL...BUT ACTIVITY WILL
REMAIN EMBEDDED WITHIN STRONG LOW LEVEL AND DEEP LAYER SHEAR WITH
POTENTIAL FOR ISOLATED TORNADOES AND DAMAGING WIND.

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 24035.


...DIAL

Tornado 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.