Tornado Watch 779

Issued

Oct 29, 2009, 1:59 AM CDT (06:59 UTC)

Expired

Oct 29, 2009, 6:54 AM CDT

In force

5 hr

Issued by

the Storm Prediction Center

Largest hail expected

1 in

Strongest gust expected

60 kt

The Altus AFB radar (KFDR), 80 km from the middle of the area, began a volume at 07:00 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

30%

One or more hailstones of 2 inches or more

20%

Six or more combined severe hail and wind reports

70%

• Mesoscale Discussion 2151Oct 29, 1:07 AM CDT
• Mesoscale Discussion 2152Oct 29, 3:40 AM CDT
• Mesoscale Discussion 2154Oct 29, 5:31 AM CDT

710 
WWUS20 KWNS 290705
SEL9  
SPC WW 290705
OKZ000-TXZ000-291400-

URGENT - IMMEDIATE BROADCAST REQUESTED
TORNADO WATCH NUMBER 779
NWS STORM PREDICTION CENTER NORMAN OK
200 AM CDT THU OCT 29 2009

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

       CENTRAL AND SOUTHWESTERN OKLAHOMA
       NORTHWESTERN TEXAS

EFFECTIVE THIS THURSDAY MORNING FROM 200 AM UNTIL 900 AM CDT.

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 60 STATUTE
MILES EAST AND WEST OF A LINE FROM 25 MILES SOUTH SOUTHEAST OF
ABILENE TEXAS TO 40 MILES NORTH OF OKLAHOMA CITY OKLAHOMA.  FOR A
COMPLETE DEPICTION OF THE WATCH SEE THE ASSOCIATED WATCH OUTLINE
UPDATE (WOUS64 KWNS WOU9).

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 778...

DISCUSSION...A LINE OF STORMS FROM WEST CENTRAL OK SWWD INTO NWRN TX
WAS SLOWLY BECOMING BETTER ORGANIZED...AS STRONGER FORCING SPREADS
IN FROM THE SOUTHWEST. STRONGER CONVECTION CURRENTLY IS LOCATED
ALONG OR JUST BEHIND COLD FRONT. AS THE LINE MOVES SLOWLY EWD INTO A
MODERATELY UNSTABLE AIR MASS AND DEWPOINTS IN THE MID 60S...THE
POTENTIAL FOR SURFACE BASED STORMS WILL INCREASE. ALSO...GIVEN
EFFECTIVE SHEAR AT 60-70 KT AND 1 KM SRH IN THE 400-500 M2/S2
RANGE...ROTATING STORMS ARE LIKELY WITH EMBEDDED BOWS/WIND DAMAGE
AND POSSIBLY TORNADOES.

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 500.
MEAN STORM MOTION VECTOR 21040.


...IMY

Tornado Watches in Texas, 2009Tornado Watches in Oklahoma, 2009Every tornado watch in 2009

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.