Tornado Watch 677

Issued

Dec 9, 2012, 2:10 PM CST (20:10 UTC)

Expired

Dec 9, 2012, 11:00 PM CST

In force

9 hr

Issued by

the Storm Prediction Center

Largest hail expected

2 in

Strongest gust expected

60 kt

The Memphis radar (KNQA), 121 km from the middle of the area, began a volume at 20:10 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

40%

One or more gusts of 65 knots or more

30%

Ten or more severe hail reports

30%

One or more hailstones of 2 inches or more

20%

Six or more combined severe hail and wind reports

70%

• Mesoscale Discussion 2139Dec 9, 12:38 PM CST
• Mesoscale Discussion 2142Dec 9, 5:54 PM CST
• Mesoscale Discussion 2143Dec 9, 8:02 PM CST

279 
WWUS20 KWNS 092010
SEL7  
SPC WW 092010
ARZ000-ILZ000-KYZ000-MOZ000-TNZ000-100300-

URGENT - IMMEDIATE BROADCAST REQUESTED
TORNADO WATCH NUMBER 677
NWS STORM PREDICTION CENTER NORMAN OK
210 PM CST SUN DEC 9 2012

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

       CENTRAL AND NORTHEAST ARKANSAS
       SOUTHERN ILLINOIS
       WESTERN KENTUCKY
       SOUTHEAST MISSOURI
       NORTHWEST TENNESSEE

EFFECTIVE THIS SUNDAY AFTERNOON AND EVENING FROM 210 PM UNTIL 900
PM CST.

TORNADOES...HAIL TO 2 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 75 STATUTE
MILES EAST AND WEST OF A LINE FROM 30 MILES NORTHEAST OF CAPE
GIRARDEAU MISSOURI TO 25 MILES WEST OF PINE BLUFF ARKANSAS.  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.

DISCUSSION...THUNDERSTORMS ARE BEGINNING TO INTENSIFY OVER CENTRAL
AR ALONG/AHEAD OF COLD FRONT.  STORMS SHOULD INCREASE IN COVERAGE
THROUGH THE AFTERNOON ACROSS THE WATCH AREA AS LOW LEVEL WINDS
STRENGTHEN.  A FEW SEVERE STORMS CAPABLE OF DAMAGING WINDS AND HAIL
ARE EXPECTED.  ISOLATED SUPERCELLS ARE ALSO POSSIBLE WITH A RISK OF
A TORNADO OR TWO THROUGH THE EARLY EVENING.

AVIATION...TORNADOES AND A FEW SEVERE THUNDERSTORMS WITH HAIL
SURFACE AND ALOFT TO 2 INCHES. EXTREME TURBULENCE AND SURFACE
WIND GUSTS TO 60 KNOTS. A FEW CUMULONIMBI WITH MAXIMUM TOPS TO
400. MEAN STORM MOTION VECTOR 25035.


...HART

Tornado Watches in Arkansas, 2012Tornado Watches in Missouri, 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.