Tornado Watch 670

Issued

Oct 17, 2012, 8:23 PM CDT (01:23 UTC)

Expired

Oct 18, 2012, 1:31 AM CDT

In force

5 hr

Issued by

the Storm Prediction Center

Largest hail expected

1 in

Strongest gust expected

60 kt

Counties Alcorn County, MS, Benton County, MS, Calhoun County, MS, Chickasaw County, MS, Itawamba County, MS, Lafayette County, MS, Lee County, MS, Monroe County, MS, Pontotoc County, MS, Prentiss County, MS, Tippah County, MS, Tishomingo County, MS, Union County, MS, Yalobusha County, MS

The Columbus AFB radar (KGWX), 103 km from the middle of the area, began a volume at 01:26 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

30%

Ten or more severe wind reports

40%

One or more gusts of 65 knots or more

10%

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

70%

• Mesoscale Discussion 2069Oct 17, 8:07 PM CDT
• Mesoscale Discussion 2070Oct 17, 9:28 PM CDT
• Mesoscale Discussion 2072Oct 17, 11:49 PM CDT

749 
WWUS20 KWNS 180124
SEL0
SPC WW 180124
MSZ000-180800-

URGENT - IMMEDIATE BROADCAST REQUESTED
TORNADO WATCH NUMBER 670
NWS STORM PREDICTION CENTER NORMAN OK
825 PM CDT WED OCT 17 2012

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

       NORTHEAST MISSISSIPPI

EFFECTIVE THIS WEDNESDAY NIGHT AND THURSDAY MORNING FROM 825 PM
UNTIL 300 AM 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 50 STATUTE
MILES EAST AND WEST OF A LINE FROM 50 MILES NORTH OF TUPELO
MISSISSIPPI TO 40 MILES SOUTH SOUTHEAST OF OXFORD MISSISSIPPI.
FOR A COMPLETE DEPICTION OF THE WATCH SEE THE ASSOCIATED WATCH
OUTLINE UPDATE (WOUS64 KWNS WOU0).

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 667...WW 668...WW 669...

DISCUSSION...BROKEN SQLN WITH LONG-LIVED SUPERCELLS NOW CROSSING
INTO NW MS FROM AR EXPECTED TO CONTINUE EWD INTO NE MS LATER TNGT.
AREA SFC OBSERVATIONS AND PRESSURE CHANGE DATA ...COUPLED WITH VERY
STRONG...DEEPLY VEERING WIND PROFILE AT MEMPHIS...SUGGEST THAT A
COUPLE SUPERCELLS...AND THEIR ATTENDANT TORNADO THREAT...MAY EXTEND
EWD INTO SOMEWHAT DRIER LOW-LVL ENVIRONMENT OVER NE MS GIVEN THE
FAST FORWARD MOTION OF THE STORMS...AND RAPIDLY RECOVERING AIR MASS
JUST ABOVE THE NOCTURNAL SKIN LAYER.

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 500.
MEAN STORM MOTION VECTOR 27040.


...CORFIDI

Tornado Watches in Mississippi, 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.