Alert archive / Oklahoma / Tornado Watches in 2007
Tornado Watch 251
The Storm Prediction Center issued this tornado watch at May 6, 2007, 11:54 PM CDT for 19 counties in Oklahoma; 5 counties in Texas. It was in force for 5 hr.
The area
The outline as issued.
The facts
- Issued
- May 6, 2007, 11:54 PM CDT (04:54 UTC)
- Expired
- May 7, 2007, 5:00 AM CDT
- In force
- 5 hr
- Issued by
- the Storm Prediction Center
- Largest hail expected
- 1 in
- Strongest gust expected
- 50 kt
All 24 counties
Caddo County, OK, Canadian County, OK, Cleveland County, OK, Comanche County, OK, Cotton County, OK, Garvin County, OK, Grady County, OK, Jackson County, OK, Jefferson County, OK, Kay County, OK, Kingfisher County, OK, Kiowa County, OK, Logan County, OK, McClain County, OK, Noble County, OK, Oklahoma County, OK, Stephens County, OK, Tillman County, OK, Washita County, OK, Archer County, TX, Baylor County, TX, Clay County, TX, Wichita County, TX, Wilbarger County, TX
What SPC expected
The probabilities SPC published with the watch, for the watch area over its life.
- Two or more tornadoes
- 30%
- One or more EF2 to EF5 tornadoes
- 10%
- Ten or more severe wind reports
- 20%
- One or more gusts of 65 knots or more
- 5%
- Ten or more severe hail reports
- 20%
- One or more hailstones of 2 inches or more
- 5%
- Six or more combined severe hail and wind reports
- 30%
Warnings issued inside it
6 tornado, severe thunderstorm and flash flood warnings for its counties while it was in force.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| May 6, 11:54 PM CDT | Flash Flood Warning | OUN | Beckham, Custer, Washita | 4 hr |
| May 7, 12:57 AM CDT | Severe Thunderstorm Warning | OUN | Cotton | 48 min |
| May 7, 1:13 AM CDT | Severe Thunderstorm Warning | OUN | Comanche, Stephens | 47 min |
| May 7, 1:49 AM CDT | Severe Thunderstorm Warning | OUN | Caddo, Grady | 41 min |
| May 7, 2:02 AM CDT | Severe Thunderstorm Warning | OUN | Stephens | 32 min |
| May 7, 2:19 AM CDT | Severe Thunderstorm Warning | OUN | Cleveland, McClain, Oklahoma | 41 min |
Discussions around it
SPC mesoscale discussions over the same counties from four hours before the watch to its end.
The nearest sounding before it
Norman, OK (KOUN), launched 00:00Z, 4.9 hours before the alert went out and 88 km from the middle of its area. This is the routine balloon launch nearest before it, the air the forecaster had in hand, not a measurement taken for the alert.
- Mixed-layer CAPE
- 2453 J/kg
- Mixed-layer CIN
- -2 J/kg
- Mixed-layer LCL
- 905 m above ground
- 0-6 km bulk shear
- 27 kt
- 0-1 km storm-relative helicity
- 187 m²/s²
- 0-3 km storm-relative helicity
- 236 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.0
The text
As transmitted, in the capitals the NWS used until 2016.
000
WWUS20 KWNS 070454
SEL1
SPC WW 070454
OKZ000-TXZ000-071000-
URGENT - IMMEDIATE BROADCAST REQUESTED
TORNADO WATCH NUMBER 251
NWS STORM PREDICTION CENTER NORMAN OK
1155 PM CDT SUN MAY 6 2007
THE NWS STORM PREDICTION CENTER HAS ISSUED A
TORNADO WATCH FOR PORTIONS OF
WESTERN AND CENTRAL OKLAHOMA
WESTERN NORTH TEXAS
EFFECTIVE THIS SUNDAY NIGHT AND MONDAY MORNING FROM 1155 PM UNTIL
500 AM CDT.
TORNADOES...HAIL TO 1 INCH IN DIAMETER...THUNDERSTORM WIND GUSTS
TO 60 MPH...AND DANGEROUS LIGHTNING ARE POSSIBLE IN THESE AREAS.
THE TORNADO WATCH AREA IS APPROXIMATELY ALONG AND 60 STATUTE
MILES NORTH AND SOUTH OF A LINE FROM 40 MILES SOUTH OF ALTUS
OKLAHOMA TO CHANDLER OKLAHOMA. FOR A COMPLETE DEPICTION OF THE
WATCH SEE THE ASSOCIATED WATCH OUTLINE UPDATE (WOUS64 KWNS WOU1).
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 248...WW 249...WW 250...
DISCUSSION...SCTD SHOWERS/TSTMS HAVE DEVELOPED IN THE PAST HOUR IN
MOIST/UNSTABLE ENVIRONMENT ALONG THE I-44 CORRIDOR. WEAKLY
CONFLUENT NEAR-SFC FLOW...RICH MOISTURE...PROXIMITY OF 50 KT LLJ AND
DISCRETE NATURE OF CONVECTION SUGGEST POTENTIAL FOR ISOLATED
TORNADOES.
AVIATION...TORNADOES AND A FEW SEVERE THUNDERSTORMS WITH HAIL
SURFACE AND ALOFT TO 1 INCH. EXTREME TURBULENCE AND SURFACE WIND
GUSTS TO 50 KNOTS. A FEW CUMULONIMBI WITH MAXIMUM TOPS TO 500.
MEAN STORM MOTION VECTOR 21030.
...CORFIDISPC that day
Everything else SPC issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| May 6, 8:55 PM CDT | Mesoscale Discussion | SPC | Cherokee, Craig, Creek, Delaware, Hughes, McIntosh and 14 more | 65 min |
| May 6, 9:07 PM CDT | Tornado Watch | SPC | Cherokee, Coal, Craig, Creek, Delaware, Hughes and 19 more | 6 hr |
| May 6, 9:26 PM CDT | Mesoscale Discussion | SPC | Alfalfa, Beckham, Blaine, Caddo, Canadian, Custer and 10 more | 64 min |
| May 6, 11:04 PM CDT | Mesoscale Discussion | SPC | Atoka, Bryan, Caddo, Canadian, Carter, Choctaw and 17 more | 56 min |
| May 6, 11:34 PM CDT | Mesoscale Discussion | SPC | Cherokee, Coal, Craig, Creek, Delaware, Hughes and 19 more | 56 min |
| May 7, 1:59 AM CDT | Mesoscale Discussion | SPC | Cherokee, Coal, Craig, Creek, Delaware, Hughes and 18 more | 91 min |
| May 7, 4:30 AM CDT | Mesoscale Discussion | SPC | Caddo, Canadian, Cleveland, Comanche, Cotton, Garvin and 8 more | 30 min |
| May 7, 10:29 AM CDT | Mesoscale Discussion | SPC | Atoka, Bryan, Carter, Choctaw, Coal, Johnston and 3 more | 2 hr |
| May 7, 10:51 AM CDT | Tornado Watch | SPC | Atoka, Bryan, Carter, Choctaw, Coal, Garvin and 10 more | 5 hr |
| May 6, 7:04 PM CDT | Mesoscale Discussion | SPC | Crockett, Irion, Reagan, Terrell, Upton | 56 min |
| May 6, 7:55 PM CDT | Tornado Watch | SPC | Coke, Coleman, Concho, Crockett, Glasscock, Howard and 13 more | 6 hr |
| May 6, 10:20 PM CDT | Mesoscale Discussion | SPC | Concho, Irion, Reagan, Tom Green | 55 min |
| May 7, 1:14 PM CDT | Mesoscale Discussion | SPC | Crockett, Edwards, Irion, Kimble, Kinney, Menard and 6 more | 61 min |
| May 7, 1:59 PM CDT | Mesoscale Discussion | SPC | Crockett, Edwards, Irion, Kimble, Kinney, Menard and 6 more | 61 min |
| May 7, 5:38 PM CDT | Mesoscale Discussion | SPC | Dimmit, Kinney, Maverick, Uvalde, Zavala | 67 min |
| May 7, 5:59 PM CDT | Tornado Watch | SPC | Bandera, Dimmit, Edwards, Frio, Kerr, Kinney and 8 more | 8 hr |
| May 7, 6:19 PM CDT | Mesoscale Discussion | SPC | Brewster, Crane, Ector, Jeff Davis, Midland, Pecos and 7 more | 86 min |
| May 7, 6:42 PM CDT | Tornado Watch | SPC | Brewster, Jeff Davis, Pecos, Presidio, Reeves, Terrell | 5 hr |
Nearby
Tornado Watches in Oklahoma, 2007Tornado Watches in Texas, 2007Every tornado watch in 2007
Sources
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.