Tornado Watch 163

Issued

Apr 13, 2012, 8:36 PM CDT (01:36 UTC)

Expired

Apr 14, 2012, 4:00 AM CDT

In force

7 hr

Issued by

the Storm Prediction Center

Largest hail expected

2.5 in

Strongest gust expected

60 kt

The Vance AFB radar (KVNX), 93 km from the middle of the area, began a volume at 01:37 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

50%

One or more EF2 to EF5 tornadoes

40%

Ten or more severe wind reports

30%

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

60%

Six or more combined severe hail and wind reports

90%

• Mesoscale Discussion 512Apr 13, 5:47 PM CDT
• Mesoscale Discussion 514Apr 13, 7:35 PM CDT
• Mesoscale Discussion 517Apr 13, 9:58 PM CDT
• Mesoscale Discussion 518Apr 13, 11:45 PM CDT
• Mesoscale Discussion 519Apr 14, 2:40 AM CDT

886 
WWUS20 KWNS 140141
SEL3
SPC WW 140141
OKZ000-140900-

URGENT - IMMEDIATE BROADCAST REQUESTED
TORNADO WATCH NUMBER 163
NWS STORM PREDICTION CENTER NORMAN OK
835 PM CDT FRI APR 13 2012

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

       WESTERN AND CENTRAL OKLAHOMA

EFFECTIVE THIS FRIDAY NIGHT AND SATURDAY MORNING FROM 835 PM
UNTIL 400 AM CDT.

TORNADOES...HAIL TO 2.5 INCHES IN DIAMETER...THUNDERSTORM WIND
GUSTS TO 70 MPH...AND DANGEROUS LIGHTNING ARE POSSIBLE IN THESE
AREAS.

THE TORNADO WATCH AREA IS APPROXIMATELY ALONG AND 75 STATUTE
MILES NORTH AND SOUTH OF A LINE FROM 45 MILES WEST NORTHWEST OF
CLINTON OKLAHOMA TO 40 MILES EAST NORTHEAST OF CHANDLER OKLAHOMA.
 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 160...WW 161...WW 162...

DISCUSSION...CLUSTER OF SUPERCELLS WITH A HISTORY OF TORNADOES OVER
SWRN OK /FROM W LTS TO NW FSI/ IS EXPECTED TO TRACK ENEWD ALONG
OUTFLOW BOUNDARY INTO CNTRL OK LATER TONIGHT.  CURRENT VAD
OBSERVATIONS FROM FREDRICK OK AND TWIN LAKES OK INDICATE NOTABLE
STRENGTHENING OF THE LLJ OVER THE PAST HOUR WITH 0-1 KM SRH OF
300-400 M2/S2.  TORNADO THREAT WILL BE DICTATED BY ABILITY OF STORMS
TO MANAGE CONVECTIVE OUTFLOW...THOUGH SIGNIFICANT TORNADOES ARE
POSSIBLE GIVEN THE STRONG LOW-LEVEL SHEAR.  ELSEWHERE...A SECONDARY
CORRIDOR OF TORNADO POTENTIAL WILL EXIST TONIGHT ACROSS PORTIONS OF
NRN OK WHERE LOW-LEVEL SHEAR AND MOISTURE ARE INCREASING WITHIN A
BOUNDARY LAYER THAT WAS NOT OVERTURNED BY EARLIER CONVECTION.

AVIATION...TORNADOES AND A FEW SEVERE THUNDERSTORMS WITH HAIL
SURFACE AND ALOFT TO 2.5 INCHES. EXTREME TURBULENCE AND SURFACE
WIND GUSTS TO 60 KNOTS. A FEW CUMULONIMBI WITH MAXIMUM TOPS TO
500. MEAN STORM MOTION VECTOR 24020.


...MEAD

Tornado Watches in Oklahoma, 2012Every tornado watch in 2012

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.