Tornado Watch 873

Issued

Nov 7, 2011, 8:28 PM CST (02:28 UTC)

Expired

Nov 8, 2011, 4:00 AM CST

In force

8 hr

Issued by

the Storm Prediction Center

Largest hail expected

2 in

Strongest gust expected

65 kt

The Norman radar (KTLX), 23 km from the middle of the area, began a volume at 02:28 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

80%

One or more gusts of 65 knots or more

30%

Ten or more severe hail reports

50%

One or more hailstones of 2 inches or more

20%

Six or more combined severe hail and wind reports

95%

• Mesoscale Discussion 2291Nov 7, 4:58 PM CST
• Mesoscale Discussion 2293Nov 7, 5:51 PM CST
• Mesoscale Discussion 2295Nov 7, 7:43 PM CST
• Mesoscale Discussion 2297Nov 7, 11:20 PM CST
• Mesoscale Discussion 2298Nov 8, 1:17 AM CST
• Mesoscale Discussion 2299Nov 8, 2:12 AM CST

152 
WWUS20 KWNS 080231
SEL3
SPC WW 080231
OKZ000-TXZ000-081000-

URGENT - IMMEDIATE BROADCAST REQUESTED
TORNADO WATCH NUMBER 873
NWS STORM PREDICTION CENTER NORMAN OK
825 PM CST MON NOV 7 2011

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

       SOUTHWEST THROUGH CENTRAL TO NORTHEAST OKLAHOMA
       NORTHWEST TEXAS

EFFECTIVE THIS MONDAY NIGHT AND TUESDAY MORNING FROM 825 PM UNTIL
400 AM CST.

TORNADOES...HAIL TO 2 INCHES IN DIAMETER...THUNDERSTORM WIND
GUSTS TO 75 MPH...AND DANGEROUS LIGHTNING ARE POSSIBLE IN THESE
AREAS.

THE TORNADO WATCH AREA IS APPROXIMATELY ALONG AND 65 STATUTE
MILES EAST AND WEST OF A LINE FROM 25 MILES NORTHEAST OF
BARTLESVILLE OKLAHOMA TO 70 MILES SOUTHWEST OF WICHITA FALLS
TEXAS.  FOR A COMPLETE DEPICTION OF THE WATCH SEE THE ASSOCIATED
WATCH OUTLINE UPDATE (WOUS64 KWNS WOU3).

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 870...WW 871...WW 872...

DISCUSSION...EXISTING SUPERCELLS HAVE EVOLVED INTO AN EXTENSIVE
BROKEN SW-NE SQLN...WITH EMBEDDED LEWPS AND ROTATING STRUCTURES.
BOTH LOW LVL AND DEEP SHEAR EXPECTED TO STRENGTHEN SOMEWHAT LATER
TNGT AS NM UPR VORT AND ASSOCIATED SPEED MAX CONTINUE NEWD.
CONTINUED INFLOW OF LOW LVL MOISTURE...COUPLED WITH STRENGTHENING
SHEAR/ASCENT...MAY SUFFICIENTLY OFFSET DIURNAL INCREASE IN SBCIN TO
MAINTAIN A THREAT FOR ISOLD TORNADOES WITH THE STORMS...IN ADDITION
TO SWATHS OF DMGG WIND AND SVR HAIL.  SETUP ALSO MAY SUPPORT A FEW
CORRIDORS WITH PROLONGED HEAVY RAIN.

AVIATION...TORNADOES AND A FEW SEVERE THUNDERSTORMS WITH HAIL
SURFACE AND ALOFT TO 2 INCHES. EXTREME TURBULENCE AND SURFACE
WIND GUSTS TO 65 KNOTS. A FEW CUMULONIMBI WITH MAXIMUM TOPS TO
500. MEAN STORM MOTION VECTOR 23035.


...CORFIDI

Tornado Watches in Oklahoma, 2011Tornado Watches in Texas, 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.