Tornado Watch 215

Issued

Apr 30, 2012, 9:51 PM CDT (02:51 UTC)

Expired

May 1, 2012, 2:00 AM CDT

In force

4 hr

Issued by

the Storm Prediction Center

Largest hail expected

2.5 in

Strongest gust expected

70 kt

The Norman radar (KTLX), 89 km from the middle of the area, began a volume at 02:53 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

30%

Ten or more severe wind reports

80%

One or more gusts of 65 knots or more

40%

Ten or more severe hail reports

80%

One or more hailstones of 2 inches or more

30%

Six or more combined severe hail and wind reports

95%

• Mesoscale Discussion 636Apr 30, 6:11 PM CDT
• Mesoscale Discussion 639Apr 30, 8:55 PM CDT
• Mesoscale Discussion 641Apr 30, 11:28 PM CDT
• Mesoscale Discussion 642May 1, 1:19 AM CDT

239 
WWUS20 KWNS 010258
SEL5
SPC WW 010258
OKZ000-TXZ000-010700-

URGENT - IMMEDIATE BROADCAST REQUESTED
TORNADO WATCH NUMBER 215
NWS STORM PREDICTION CENTER NORMAN OK
950 PM CDT MON APR 30 2012

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

       CENTRAL AND SOUTHERN OKLAHOMA
       WESTERN NORTH TEXAS

EFFECTIVE THIS MONDAY NIGHT AND TUESDAY MORNING FROM 950 PM UNTIL
200 AM CDT.

TORNADOES...HAIL TO 2.5 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 70 STATUTE
MILES EAST AND WEST OF A LINE FROM 50 MILES SOUTH SOUTHEAST OF
FORT SILL OKLAHOMA TO 60 MILES NORTHWEST OF CHANDLER 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.

OTHER WATCH INFORMATION...CONTINUE...WW 210...WW 211...WW
212...WW 213...WW 214...

DISCUSSION...SUPERCELL COMPLEX IN SW OK EXPECTED MOVE/DEVELOP E OR
ESE THROUGH EARLY TUE AS LLJ CONTINUES TO STRENGTHEN AND SLIGHTLY
VEER IN RESPONSE TO PASSING UPR IMPULSE NOW OVER SW KS.  QUALITY OF
MOISTURE...STEEP MID LVL LAPSE RATES...AND 30+ KT WLY 700 MB FLOW
SUGGEST A CONTINUED RISK FOR A FEW LOW LVL MESOS AND POSSIBLE
TORNADOES...IN ADDITION TO A CONTINUED RISK FOR LARGE HAIL AND AN
INCREASING RISK FOR DMGG WIND.  FARTHER N...SUSTAINED MOIST SLY FLOW
SUGGESTS THAT OTHER STORMS MAY FORM SW OF CURRENT N CNTRL OK
SUPERCELL COMPLEX.  IF THIS DOES OCCUR...THE STORMS SHOULD MOVE
MAINLY EWD...AFFECTING AREAS FROM ENID S AND SE INTO THE OKC AND
STILLWATER AREAS WITH LARGE HAIL...DMGG WIND...AND PERHAPS A COUPLE
TORNADOES BEFORE ACTIVITY EVOLVES INTO AN MCS.

AVIATION...TORNADOES AND A FEW SEVERE THUNDERSTORMS WITH HAIL
SURFACE AND ALOFT TO 2.5 INCHES. EXTREME TURBULENCE AND SURFACE
WIND GUSTS TO 70 KNOTS. A FEW CUMULONIMBI WITH MAXIMUM TOPS TO
550. MEAN STORM MOTION VECTOR 28030.


...CORFIDI

Tornado Watches in Oklahoma, 2012Tornado Watches in Texas, 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.