Tornado Watch 135

Issued

Apr 14, 2011, 2:28 PM CDT (19:28 UTC)

Expired

Apr 14, 2011, 9:07 PM CDT

In force

7 hr

Issued by

the Storm Prediction Center

Particularly dangerous situation

Yes

Largest hail expected

4 in

Strongest gust expected

70 kt

The Norman radar (KTLX), 80 km from the middle of the area, began a volume at 19:31 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

90%

One or more EF2 to EF5 tornadoes

60%

Ten or more severe wind reports

80%

One or more gusts of 65 knots or more

50%

Ten or more severe hail reports

95%

One or more hailstones of 2 inches or more

95%

Six or more combined severe hail and wind reports

95%

• Mesoscale Discussion 425Apr 14, 1:33 PM CDT
• Mesoscale Discussion 426Apr 14, 5:21 PM CDT
• Mesoscale Discussion 427Apr 14, 6:18 PM CDT
• Mesoscale Discussion 430Apr 14, 8:36 PM CDT

785 
WWUS20 KWNS 141932
SEL5
SPC WW 141932
OKZ000-TXZ000-150300-

URGENT - IMMEDIATE BROADCAST REQUESTED
TORNADO WATCH NUMBER 135
NWS STORM PREDICTION CENTER NORMAN OK
230 PM CDT THU APR 14 2011

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

       MUCH OF THE EASTERN HALF OF OKLAHOMA
       PARTS OF NORTH CENTRAL/NORTHEASTERN TEXAS

EFFECTIVE THIS THURSDAY AFTERNOON AND EVENING FROM 230 PM UNTIL
1000 PM CDT.

...THIS IS A PARTICULARLY DANGEROUS SITUATION...

DESTRUCTIVE TORNADOES...LARGE HAIL TO 4 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 80 STATUTE
MILES EAST AND WEST OF A LINE FROM 15 MILES NORTH NORTHEAST OF
BARTLESVILLE OKLAHOMA TO 40 MILES SOUTH SOUTHEAST OF SHERMAN
TEXAS.  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.

OTHER WATCH INFORMATION...CONTINUE...WW 134...

DISCUSSION...DRY LINE LOCATED VICINITY I-35 CORRIDOR WITH THE AIR
MASS NOW VERY UNSTABLE EWD ACROSS OK.  WITH LITTLE REMAINING
CINH...SEVERE THUNDERSTORMS WILL DEVELOP RAPIDLY OFF THE DRY LINE
AND MOVE THRU A VERY FAVORABLE ENVIRONMENT FOR SUPERCELLS. INITIALLY
VERY LARGE HAIL WILL BE THE RISK GIVEN THE STEEP LAPSE RATES AND
DEEP LAYER SHEAR.  AS THE STRONG UPPER JET MAX APPROACHES TORNADIC
SUPERCELLS WILL BECOME MORE LIKELY BY LATER  THIS AFTERNOON/EVENING
WITH POTENTIAL FOR LONG LIVED SUPERCELLS AND STRONG TORNADOES.  DRY
LINE VERY LIKELY WILL MOVE LITTLE EWD FROM CURRENT POSITION WITH
POTENTIAL FOR SEVERE STORMS DEVELOPING ON W EDGE OF WATCH INTO THE
EVENING HOURS.

AVIATION...TORNADOES AND A FEW SEVERE THUNDERSTORMS WITH HAIL
SURFACE AND ALOFT TO 4 INCHES. EXTREME TURBULENCE AND SURFACE
WIND GUSTS TO 70 KNOTS. A FEW CUMULONIMBI WITH MAXIMUM TOPS TO
550. MEAN STORM MOTION VECTOR 24035.


...HALES

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.