Tornado Watch 722

Issued

Oct 18, 2007, 1:31 PM CDT (18:31 UTC)

Expired

Oct 18, 2007, 11:00 PM CDT

In force

9 hr

Issued by

the Storm Prediction Center

Largest hail expected

2 in

Strongest gust expected

70 kt

The Memphis radar (KNQA), 74 km from the middle of the area, began a volume at 18:31 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

70%

One or more EF2 to EF5 tornadoes

30%

Ten or more severe wind reports

60%

One or more gusts of 65 knots or more

40%

Ten or more severe hail reports

40%

One or more hailstones of 2 inches or more

30%

Six or more combined severe hail and wind reports

95%

• Mesoscale Discussion 2108Oct 18, 10:26 AM CDT
• Mesoscale Discussion 2111Oct 18, 1:44 PM CDT
• Mesoscale Discussion 2113Oct 18, 3:52 PM CDT
• Mesoscale Discussion 2114Oct 18, 5:39 PM CDT
• Mesoscale Discussion 2118Oct 18, 7:51 PM CDT
• Mesoscale Discussion 2119Oct 18, 9:51 PM CDT
• Mesoscale Discussion 2121Oct 18, 10:50 PM CDT

000
WWUS20 KWNS 181833
SEL2  
SPC WW 181833
ALZ000-ARZ000-ILZ000-INZ000-KYZ000-MOZ000-MSZ000-TNZ000-190400-

URGENT - IMMEDIATE BROADCAST REQUESTED
TORNADO WATCH NUMBER 722
NWS STORM PREDICTION CENTER NORMAN OK
135 PM CDT THU OCT 18 2007

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

       PART OF NORTHERN ALABAMA
       PARTS OF NORTHEAST ARKANSAS
       PARTS OF SOUTHERN ILLINOIS
       SMALL PART OF SOUTHERN INDIANA
       WESTERN KENTUCKY
       PARTS OF SOUTHEAST MISSOURI
       NORTHERN MISSISSIPPI
       WESTERN AND PARTS OF MIDDLE TENNESSEE

EFFECTIVE THIS THURSDAY AFTERNOON AND EVENING FROM 135 PM UNTIL
1100 PM CDT.

TORNADOES...HAIL TO 2 INCHES IN DIAMETER...THUNDERSTORM WIND
GUSTS TO 80 MPH...AND DANGEROUS LIGHTNING ARE POSSIBLE IN THESE
AREAS.

THE TORNADO WATCH AREA IS APPROXIMATELY ALONG AND 120 STATUTE
MILES EAST AND WEST OF A LINE FROM 40 MILES SOUTHEAST OF
GREENWOOD MISSISSIPPI TO 45 MILES NORTH NORTHEAST OF EVANSVILLE
INDIANA.  FOR A COMPLETE DEPICTION OF THE WATCH SEE THE
ASSOCIATED WATCH OUTLINE UPDATE (WOUS64 KWNS WOU2).

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...BROAD WARM SECTOR ACROSS LOWER MS/TN VALLEY HAS BECOME
MDTLY UNSTABLE AND WEAKLY CAPPED. WITH STRONG DEEP LAYER SHEAR
ACROSS THE WATCH AREA...THUNDERSTORMS EXPECTED TO INCREASE IN NUMBER
AND INTENSITY REMAINDER OF AFTERNOON.  SUPERCELLS INCLUDING
TORNADOES WILL BE LIKELY GIVEN THE STRONG SHEAR IN PLACE.

AVIATION...TORNADOES AND A FEW SEVERE THUNDERSTORMS WITH HAIL
SURFACE AND ALOFT TO 2 INCHES. EXTREME TURBULENCE AND SURFACE
WIND GUSTS TO 70 KNOTS. A FEW CUMULONIMBI WITH MAXIMUM TOPS TO
550. MEAN STORM MOTION VECTOR 22035.


...HALES

Tornado Watches in Kentucky, 2007Tornado Watches in Tennessee, 2007Tornado Watches in Mississippi, 2007Every tornado watch in 2007

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.