Tornado Watch 5

Issued

Jan 29, 2013, 4:57 AM CST (10:57 UTC)

Expired

Jan 29, 2013, 12:00 PM CST

In force

7 hr

Issued by

the Storm Prediction Center

Largest hail expected

1 in

Strongest gust expected

60 kt

The Norman radar (KTLX), 96 km from the middle of the area, began a volume at 10:59 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

40%

One or more hailstones of 2 inches or more

30%

Six or more combined severe hail and wind reports

70%

• Mesoscale Discussion 66Jan 29, 3:28 AM CST
• Mesoscale Discussion 68Jan 29, 9:46 AM CST

276 
WWUS20 KWNS 291100
SEL5  
SPC WW 291100
OKZ000-TXZ000-291800-

URGENT - IMMEDIATE BROADCAST REQUESTED
TORNADO WATCH NUMBER 5
NWS STORM PREDICTION CENTER NORMAN OK
500 AM CST TUE JAN 29 2013

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

       WESTERN AND CENTRAL OKLAHOMA
       FAR NORTHWEST TEXAS

EFFECTIVE THIS TUESDAY MORNING FROM 500 AM UNTIL NOON 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 60 STATUTE
MILES EAST AND WEST OF A LINE FROM 25 MILES SOUTHWEST OF FORT
SILL OKLAHOMA TO 20 MILES NORTH NORTHWEST OF PONCA CITY OKLAHOMA.
 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...TSTMS HAVE RECENTLY INTENSIFIED ALONG THE DRYLINE OVER
WRN OK IN RESPONSE TO INCREASING HEIGHT FALLS ASSOCIATED WITH WRN
U.S. TROUGH.  THESE STORMS ARE EXPECTED TO INCREASE IN COVERAGE AND
INTENSITY THIS MORNING AS LARGE-SCALE FORCING FOR ASCENT FURTHER
STRENGTHENS...AND AS LOW-LEVEL CONVERGENCE IS ENHANCED BY A
MIGRATORY SURFACE LOW DEVELOPING NEWD ACROSS THE WATCH AREA. 
MODEL-DERIVED FORECAST SOUNDINGS INDICATE THAT BOUNDARY LAYER
DEWPOINTS IN THE LOWER 60S ARE CONTRIBUTING TO MLCAPE VALUES OF
500-1000 J/KG WITH LITTLE OR NO CONVECTIVE INHIBITION.  WHEN COUPLED
WITH 60 KT OF EFFECTIVE BULK SHEAR AND EFFECTIVE SRH VALUES OF
300-350 M2/S2...THE ENVIRONMENT WILL SUPPORT SUPERCELLS AND BOWING
LINE SEGMENTS CAPABLE OF DAMAGING WINDS AND A FEW 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 400.
MEAN STORM MOTION VECTOR 23045.


...MEAD

Tornado Watches in Oklahoma, 2013Every tornado watch in 2013

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.