Tornado Watch 894

Issued

Nov 21, 2011, 8:36 PM CST (02:36 UTC)

Expired

Nov 22, 2011, 2:00 AM CST

In force

5 hr

Issued by

the Storm Prediction Center

Largest hail expected

1 in

Strongest gust expected

60 kt

The Little Rock radar (KLZK), 110 km from the middle of the area, began a volume at 02:37 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

10%

Ten or more severe wind reports

50%

One or more gusts of 65 knots or more

20%

Ten or more severe hail reports

30%

One or more hailstones of 2 inches or more

10%

Six or more combined severe hail and wind reports

60%

• Mesoscale Discussion 2350Nov 21, 8:16 PM CST
• Mesoscale Discussion 2351Nov 21, 10:45 PM CST
• Mesoscale Discussion 2352Nov 22, 1:46 AM CST

717 
WWUS20 KWNS 220236
SEL4
SPC WW 220236
ARZ000-OKZ000-220800-

URGENT - IMMEDIATE BROADCAST REQUESTED
TORNADO WATCH NUMBER 894
NWS STORM PREDICTION CENTER NORMAN OK
835 PM CST MON NOV 21 2011

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

       SOUTHERN AND PORTIONS OF CENTRAL ARKANSAS
       EXTREME SOUTHEAST OKLAHOMA

EFFECTIVE THIS MONDAY NIGHT AND TUESDAY MORNING FROM 835 PM UNTIL
200 AM CST.

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 35 STATUTE
MILES NORTH AND SOUTH OF A LINE FROM 15 MILES WEST SOUTHWEST OF
DE QUEEN ARKANSAS TO 50 MILES EAST NORTHEAST OF PINE BLUFF
ARKANSAS.  FOR A COMPLETE DEPICTION OF THE WATCH SEE THE
ASSOCIATED WATCH OUTLINE UPDATE (WOUS64 KWNS WOU4).

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...SFC-BASED/NEAR SFC-BASED STORMS HAVE EVOLVED ON SRN
FRINGE OF OTHERWISE ELEVATED TSTMS ACROSS SERN OK/NERN TX THIS
EVENING.  AS LARGE-SCALE ASCENT TIED TO THE MID-LVL WAVE CONTINUES
TO MOVE DOWNSTREAM FROM THE SRN PLAINS...MESOLOW VCNTY SERN OK WILL
TRACK ALONG BAROCLINIC ZONE ACROSS CNTRL AR THROUGH 08Z.  AIR MASS
WILL BE CHARACTERIZED BY MLCAPE TO 1000 J/KG AND SUFFICIENT LLVL
SHEAR FOR ISOLD TORNADOES.  OTHERWISE...SMALL-SCALE BOWS/LEWPS WILL
LIKELY GIVE DMGG WIND GUSTS...ESPECIALLY ALONG THE TRACK OF THE
MESOLOW.

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 450.
MEAN STORM MOTION VECTOR 25040.


...RACY

Tornado Watches in Arkansas, 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.