Tornado Watch 658

Issued

Oct 1, 2012, 1:16 PM CDT (18:16 UTC)

Expired

Oct 1, 2012, 8:00 PM CDT

In force

7 hr

Issued by

the Storm Prediction Center

Largest hail expected

1 in

Strongest gust expected

55 kt

The Atlanta radar (KFFC), 84 km from the middle of the area, began a volume at 18:17 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

20%

One or more gusts of 65 knots or more

20%

Ten or more severe hail reports

10%

One or more hailstones of 2 inches or more

10%

Six or more combined severe hail and wind reports

60%

• Mesoscale Discussion 2014Oct 1, 12:52 PM CDT
• Mesoscale Discussion 2016Oct 1, 3:00 PM CDT
• Mesoscale Discussion 2017Oct 1, 5:40 PM CDT

468 
WWUS20 KWNS 011822
SEL8
SPC WW 011822
ALZ000-GAZ000-TNZ000-020100-

URGENT - IMMEDIATE BROADCAST REQUESTED
TORNADO WATCH NUMBER 658
NWS STORM PREDICTION CENTER NORMAN OK
120 PM CDT MON OCT 1 2012

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

       EAST CENTRAL AND NORTHEAST ALABAMA
       NORTHERN AND WESTERN GEORGIA
       SOUTHERN MIDDLE TENNESSEE

EFFECTIVE THIS MONDAY AFTERNOON AND EVENING FROM 120 PM UNTIL 800
PM CDT.

TORNADOES...HAIL TO 1 INCH IN DIAMETER...THUNDERSTORM WIND GUSTS
TO 65 MPH...AND DANGEROUS LIGHTNING ARE POSSIBLE IN THESE AREAS.

THE TORNADO WATCH AREA IS APPROXIMATELY ALONG AND 95 STATUTE
MILES EAST AND WEST OF A LINE FROM 40 MILES SOUTH SOUTHEAST OF
COLUMBUS GEORGIA TO 40 MILES WEST NORTHWEST OF CHATTANOOGA
TENNESSEE.  FOR A COMPLETE DEPICTION OF THE WATCH SEE THE
ASSOCIATED WATCH OUTLINE UPDATE (WOUS64 KWNS WOU8).

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.

DISCUSSION...MODEST HEATING OF A VERY MOIST WARM SECTOR BOUNDARY
LAYER HAS CONTRIBUTED TO AN INCREASE IN THUNDERSTORMS OVER THE PAST
HOUR OR SO.  THE DEVELOPING STORMS HAVE BEGUN TO EXHIBIT WEAK
LOW-LEVEL CIRCULATIONS...AND GIVEN THE FAVORABLE LOW-LEVEL MOISTURE
AND STRONG LOW-LEVEL SHEAR /0-1 KM SHEAR VALUES AROUND 30 KT/...AN
UPWARD TREND IN TERMS OF STORM ORGANIZATION IS POSSIBLE THIS
AFTERNOON.  AS A RESULT...POTENTIAL FOR A FEW TORNADOES ALONG WITH
LOCALLY DAMAGING WIND GUSTS IS EVIDENT.

AVIATION...TORNADOES AND A FEW SEVERE THUNDERSTORMS WITH HAIL
SURFACE AND ALOFT TO 1 INCH. EXTREME TURBULENCE AND SURFACE WIND
GUSTS TO 55 KNOTS. A FEW CUMULONIMBI WITH MAXIMUM TOPS TO 450.
MEAN STORM MOTION VECTOR 21035.


...GOSS/HART

Tornado Watches in Georgia, 2012Tornado Watches in Alabama, 2012Tornado Watches in Tennessee, 2012Every tornado watch in 2012

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.