Tornado Watch 875

Issued

Nov 8, 2011, 10:49 AM CST (16:49 UTC)

Expired

Nov 8, 2011, 6:00 PM CST

In force

7 hr

Issued by

the Storm Prediction Center

Largest hail expected

1.5 in

Strongest gust expected

60 kt

The Western Arkansas radar (KSRX), 148 km from the middle of the area, began a volume at 16:52 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

20%

Ten or more severe wind reports

30%

One or more gusts of 65 knots or more

30%

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

70%

• Mesoscale Discussion 2300Nov 8, 9:38 AM CST
• Mesoscale Discussion 2301Nov 8, 10:31 AM CST
• Mesoscale Discussion 2302Nov 8, 1:03 PM CST
• Mesoscale Discussion 2304Nov 8, 3:48 PM CST
• Mesoscale Discussion 2305Nov 8, 3:53 PM CST
• Mesoscale Discussion 2306Nov 8, 5:09 PM CST

428 
WWUS20 KWNS 081651
SEL5
SPC WW 081651
ARZ000-LAZ000-OKZ000-TXZ000-090000-

URGENT - IMMEDIATE BROADCAST REQUESTED
TORNADO WATCH NUMBER 875
NWS STORM PREDICTION CENTER NORMAN OK
1050 AM CST TUE NOV 8 2011

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

       WESTERN AND CENTRAL ARKANSAS
       NORTHWEST LOUISIANA
       SOUTHEAST OKLAHOMA
       NORTH CENTRAL AND NORTHEAST TEXAS

EFFECTIVE THIS TUESDAY MORNING AND EVENING FROM 1050 AM UNTIL 600
PM CST.

TORNADOES...HAIL TO 1.5 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 70 STATUTE
MILES EAST AND WEST OF A LINE FROM 40 MILES NORTH NORTHEAST OF
RUSSELLVILLE ARKANSAS TO 50 MILES WEST OF LUFKIN TEXAS.  FOR A
COMPLETE DEPICTION OF THE WATCH SEE THE ASSOCIATED WATCH OUTLINE
UPDATE (WOUS64 KWNS WOU5).

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...AN ONGOING LINE OF STORMS WITH EMBEDDED BOWING SEGMENTS
WILL CONTINUE NEWD FROM ERN OK INTO NW AR WITH SOME RISK FOR
DAMAGING WINDS AND/OR A BRIEF TORNADO WITH EMBEDDED CIRCULATIONS.
HOWEVER...WEAK INSTABILITY SHOULD LIMIT THE NWD EXTENT OF THE
THREAT. FARTHER S IN THE WARM SECTOR...A MOIST ENVIRONMENT AND
RELATIVELY WEAK CAP WILL ALLOW SCATTERED STORM DEVELOPMENT ALONG AND
AHEAD OF THE SURFACE COLD FRONT.  VERTICAL SHEAR AND INSTABILITY
WILL BE SUFFICIENT FOR A FEW SUPERCELLS...WITH AN ACCOMPANYING RISK
FOR A COUPLE OF TORNADOES AND DAMAGING WINDS THROUGH THE AFTERNOON.

AVIATION...TORNADOES AND A FEW SEVERE THUNDERSTORMS WITH HAIL
SURFACE AND ALOFT TO 1.5 INCHES. EXTREME TURBULENCE AND SURFACE
WIND GUSTS TO 60 KNOTS. A FEW CUMULONIMBI WITH MAXIMUM TOPS TO
500. MEAN STORM MOTION VECTOR 24035.


...THOMPSON

Tornado Watches in Texas, 2011Tornado Watches in Arkansas, 2011Tornado Watches in Louisiana, 2011Every tornado watch in 2011

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.