Tornado Watch 609

Issued

Sep 2, 2012, 3:42 PM CDT (20:42 UTC)

Expired

Sep 2, 2012, 11:00 PM CDT

In force

7 hr

Issued by

the Storm Prediction Center

Largest hail expected

1 in

Strongest gust expected

60 kt

The Memphis radar (KNQA), 95 km from the middle of the area, began a volume at 20:45 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

30%

One or more EF2 to EF5 tornadoes

20%

Ten or more severe wind reports

70%

One or more gusts of 65 knots or more

20%

Ten or more severe hail reports

20%

One or more hailstones of 2 inches or more

5%

Six or more combined severe hail and wind reports

90%

• Mesoscale Discussion 1861Sep 2, 2:20 PM CDT
• Mesoscale Discussion 1865Sep 2, 7:13 PM CDT
• Mesoscale Discussion 1868Sep 2, 9:48 PM CDT

039 
WWUS20 KWNS 022047
SEL9
SPC WW 022047
ALZ000-ARZ000-MSZ000-TNZ000-030400-

URGENT - IMMEDIATE BROADCAST REQUESTED
TORNADO WATCH NUMBER 609
NWS STORM PREDICTION CENTER NORMAN OK
345 PM CDT SUN SEP 2 2012

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

       NORTHWEST ALABAMA
       FAR EASTERN ARKANSAS
       NORTHERN MISSISSIPPI
       SOUTHWEST TENNESSEE

EFFECTIVE THIS SUNDAY AFTERNOON AND EVENING FROM 345 PM UNTIL
1100 PM CDT.

TORNADOES...HAIL TO 1 INCH IN DIAMETER...THUNDERSTORM WIND GUSTS
TO 70 MPH...AND DANGEROUS LIGHTNING ARE POSSIBLE IN THESE AREAS.

THE TORNADO WATCH AREA IS APPROXIMATELY ALONG AND 105 STATUTE
MILES EAST AND WEST OF A LINE FROM 70 MILES EAST NORTHEAST OF
MEMPHIS TENNESSEE TO 45 MILES WEST SOUTHWEST OF COLUMBUS
MISSISSIPPI.  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 608...

DISCUSSION...TSTMS EXPECTED TO INCREASE IN COVERAGE/STRENGTH OVER
SRN W TN AND ERN AR/NRN MS OVER THE NEXT 2-3 HOURS...ALONG AND AHEAD
OF SE-MOVING W-E CONFLUENCE BAND ASSOCIATED WITH FORMER HRCN ISSAC.
LOW-MID LVL SPEED/DIRECTIONAL SHEAR AND WARM/MOIST LOW-LVL
ENVIRONMENT APPEAR FAVORABLE FOR SUSTAINED UPDRAFTS/SUPERCELLS WITH
A RISK FOR DMGG WIND AND POSSIBLY TORNADOES...ESPECIALLY WITH EWD
EXTENT IN WW. WITH TIME...STORMS SHOULD MERGE INTO A BKN W-E OR
WSW-ENE SQLN...WITH EMBEDDED BOWING SEGMENTS POSING A RISK FOR SVR
WIND AND ISOLD TORNADOES ESE TOWARD E CNTRL MS/CNTRL AL.

AVIATION...TORNADOES AND A FEW SEVERE THUNDERSTORMS WITH HAIL
SURFACE AND ALOFT TO 1 INCH. EXTREME TURBULENCE AND SURFACE WIND
GUSTS TO 60 KNOTS. A FEW CUMULONIMBI WITH MAXIMUM TOPS TO 550.
MEAN STORM MOTION VECTOR 29025.


...CORFIDI

Tornado Watches in Mississippi, 2012Tornado Watches in Tennessee, 2012Tornado Watches in Alabama, 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.