Tornado Watch 874

Issued

Nov 7, 2011, 9:16 PM CST (03:16 UTC)

Expired

Nov 8, 2011, 5:00 AM CST

In force

8 hr

Issued by

the Storm Prediction Center

Largest hail expected

2 in

Strongest gust expected

70 kt

The San Angelo radar (KSJT), 104 km from the middle of the area, began a volume at 03:17 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

70%

One or more gusts of 65 knots or more

30%

Ten or more severe hail reports

70%

One or more hailstones of 2 inches or more

30%

Six or more combined severe hail and wind reports

95%

• Mesoscale Discussion 2293Nov 7, 5:51 PM CST
• Mesoscale Discussion 2295Nov 7, 7:43 PM CST
• Mesoscale Discussion 2296Nov 7, 8:53 PM CST
• Mesoscale Discussion 2299Nov 8, 2:12 AM CST

245 
WWUS20 KWNS 080320
SEL4  
SPC WW 080320
TXZ000-081100-

URGENT - IMMEDIATE BROADCAST REQUESTED
TORNADO WATCH NUMBER 874
NWS STORM PREDICTION CENTER NORMAN OK
920 PM CST MON NOV 7 2011

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

       WEST TEXAS

EFFECTIVE THIS MONDAY NIGHT AND TUESDAY MORNING FROM 920 PM UNTIL
500 AM CST.

TORNADOES...HAIL TO 2 INCHES IN DIAMETER...THUNDERSTORM WIND
GUSTS TO 80 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 75 MILES NORTH NORTHWEST OF
ABILENE TEXAS TO 105 MILES SOUTHWEST OF SAN ANGELO TEXAS.  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.

OTHER WATCH INFORMATION...CONTINUE...WW 871...WW 873...

DISCUSSION...TSTMS EXPECTED TO CONTINUE FORMING ALONG N-S DRY LINE
IN W TX IN THE NEXT HOUR OR SO...WITH MORE WIDESPREAD DEVELOPMENT
LIKELY AS PACIFIC COLD FRONT NOW PASSING INK CONTINUES EWD AND
OVERTAKES THE BOUNDARY.  OTHER STORMS MAY DEVELOP SW ALONG STALLING
OUTFLOW BOUNDARY ASSOCIATED WITH THE NW TX SQLN. STORMS THROUGHOUT
THE REGION WILL BE ASSOCIATED BY INCREASING UPR DIVERGENCE
ASSOCIATED WITH GRAZING INFLUENCE OF NM UPR TROUGH.  STRENGTHENING
WIND FIELD AND LOW LVL MOISTURE RETURN AHEAD OF THE TROUGH MAY
SUPPORT A FEW SEMI-DISCRETE SUPERCELLS POSING A RISK FOR LARGE HAIL
AND TORNADOES BEFORE ACTIVITY EVOLVES INTO A SQLN.  EMBEDDED
SUPERCELLS/LEWPS IN THE LINE MAY CONTINUE TO POSE A RISK FOR SVR
WIND...HAIL...AND PERHAPS SHORT-LIVED TORNADOES THROUGH EARLY TUE
MORNING.

AVIATION...TORNADOES AND A FEW SEVERE THUNDERSTORMS WITH HAIL
SURFACE AND ALOFT TO 2 INCHES. EXTREME TURBULENCE AND SURFACE
WIND GUSTS TO 70 KNOTS. A FEW CUMULONIMBI WITH MAXIMUM TOPS TO
500. MEAN STORM MOTION VECTOR 24035.


...CORFIDI

Tornado 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.