Alert archive / Oklahoma / Tornado Watches in 2007
Tornado Watch 241
The Storm Prediction Center issued this tornado watch at May 5, 2007, 9:58 PM CDT for 18 counties in Oklahoma; 6 counties in Texas. It was in force for 7 hr.
The area
The outline as issued.
The facts
- Issued
- May 5, 2007, 9:58 PM CDT (02:58 UTC)
- Expired
- May 6, 2007, 5:00 AM CDT
- In force
- 7 hr
- Issued by
- the Storm Prediction Center
- Largest hail expected
- 1.5 in
- Strongest gust expected
- 60 kt
All 24 counties
Alfalfa County, OK, Beaver County, OK, Beckham County, OK, Blaine County, OK, Custer County, OK, Dewey County, OK, Ellis County, OK, Garfield County, OK, Grant County, OK, Greer County, OK, Harmon County, OK, Harper County, OK, Kiowa County, OK, Major County, OK, Roger Mills County, OK, Washita County, OK, Woods County, OK, Woodward County, OK, Collingsworth County, TX, Donley County, TX, Gray County, TX, Hemphill County, TX, Lipscomb County, TX, Wheeler County, TX
The radar
The Vance AFB radar (KVNX), 135 km from the middle of the area, began a volume at 02:58 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.
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
- 20%
- Ten or more severe wind reports
- 20%
- One or more gusts of 65 knots or more
- 10%
- Ten or more severe hail reports
- 30%
- One or more hailstones of 2 inches or more
- 20%
- Six or more combined severe hail and wind reports
- 60%
Warnings issued inside it
16 tornado, severe thunderstorm and flash flood warnings for its counties while it was in force.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| May 5, 10:11 PM CDT | Tornado Warning | OUN | Ellis | 34 min |
| May 5, 10:30 PM CDT | Tornado Warning | OUN | Dewey | 45 min |
| May 5, 10:55 PM CDT | Tornado Warning | OUN | Woodward | 50 min |
| May 5, 11:11 PM CDT | Severe Thunderstorm Warning | AMA | Beaver | 64 min |
| May 5, 11:39 PM CDT | Tornado Warning | OUN | Woodward | 36 min |
| May 5, 11:45 PM CDT | Tornado Warning | AMA | Gray | 31 min |
| May 6, 12:02 AM CDT | Severe Thunderstorm Warning | AMA | Donley | 58 min |
| May 6, 12:33 AM CDT | Severe Thunderstorm Warning | AMA | Gray | 57 min |
| May 6, 12:38 AM CDT | Severe Thunderstorm Warning | OUN | Harper | 52 min |
| May 6, 12:51 AM CDT | Severe Thunderstorm Warning | AMA | Hemphill | 54 min |
| May 6, 1:28 AM CDT | Severe Thunderstorm Warning | AMA | Gray | 62 min |
| May 6, 1:52 AM CDT | Severe Thunderstorm Warning | OUN | Harper | 38 min |
| May 6, 2:14 AM CDT | Severe Thunderstorm Warning | OUN | Ellis | 46 min |
| May 6, 2:18 AM CDT | Severe Thunderstorm Warning | AMA | Wheeler | 57 min |
| May 6, 2:28 AM CDT | Severe Thunderstorm Warning | OUN | Harper, Woods | 47 min |
| May 6, 5:00 AM CDT | Severe Thunderstorm Warning | OUN | Roger Mills | 45 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
Lamont, OK (KLMN), launched 00:00Z, 3.0 hours before the alert went out and 182 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
- 3637 J/kg
- Mixed-layer CIN
- 0 J/kg
- Mixed-layer LCL
- 577 m above ground
- 0-6 km bulk shear
- 43 kt
- 0-1 km storm-relative helicity
- 125 m²/s²
- 0-3 km storm-relative helicity
- 180 m²/s²
- Significant tornado parameter
- 3.3
- Supercell composite
- 14.4
The text
As transmitted, in the capitals the NWS used until 2016.
000
WWUS20 KWNS 060256
SEL1
SPC WW 060256
OKZ000-TXZ000-061000-
URGENT - IMMEDIATE BROADCAST REQUESTED
TORNADO WATCH NUMBER 241
NWS STORM PREDICTION CENTER NORMAN OK
955 PM CDT SAT MAY 5 2007
THE NWS STORM PREDICTION CENTER HAS ISSUED A
TORNADO WATCH FOR PORTIONS OF
WESTERN OKLAHOMA
THE EASTERN TEXAS PANHANDLE
EFFECTIVE THIS SATURDAY NIGHT AND SUNDAY MORNING FROM 955 PM
UNTIL 500 AM CDT.
TORNADOES...HAIL TO 1.5 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 60 STATUTE
MILES EAST AND WEST OF A LINE FROM 15 MILES NORTH OF ALVA
OKLAHOMA TO 60 MILES SOUTHWEST OF CLINTON 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...THIS TORNADO WATCH REPLACES TORNADO
WATCH NUMBER 234. WATCH NUMBER 234 WILL NOT BE IN EFFECT AFTER
955 PM CDT. CONTINUE...WW 236...WW 237...WW 238...WW 239...WW
240...
DISCUSSION...ISOLATED TO WIDELY SCATTERED SUPERCELLS POSING A THREAT
FOR TORNADOES MAY PERSIST/DEVELOP THROUGH EARLY SUNDAY AS WEAK COLD
SURGE MOVING E ACROSS THE OK/TX PANHANDLE ENCOUNTERS RICH MOIST
ENVIRONMENT OVER THE ERN PANHANDLE/WRN OK.
AVIATION...TORNADOES AND A FEW SEVERE THUNDERSTORMS WITH HAIL
SURFACE AND ALOFT TO 1.5 INCHES. EXTREME TURBULENCE AND SURFACE
WIND GUSTS TO 60 KNOTS. A FEW CUMULONIMBI WITH MAXIMUM TOPS TO
500. MEAN STORM MOTION VECTOR 22030.
...CORFIDISPC that day
Everything else SPC issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| May 5, 7:34 PM CDT | Mesoscale Discussion | SPC | Tillman | 56 min |
| May 5, 7:48 PM CDT | Tornado Watch | SPC | Comanche, Jackson, Tillman | 7 hr |
| May 5, 11:24 PM CDT | Mesoscale Discussion | SPC | Beaver, Ellis, Harper, Roger Mills, Woods, Woodward | 66 min |
| May 6, 3:37 AM CDT | Mesoscale Discussion | SPC | Alfalfa, Beckham, Blaine, Custer, Dewey, Ellis and 9 more | 53 min |
| May 6, 7:50 AM CDT | Mesoscale Discussion | SPC | Alfalfa, Beckham, Custer, Dewey, Greer, Harmon and 4 more | 85 min |
| May 6, 9:19 AM CDT | Tornado Watch | SPC | Alfalfa, Beckham, Blaine, Caddo, Canadian, Cleveland and 37 more | 5 hr |
| May 6, 11:41 AM CDT | Mesoscale Discussion | SPC | Alfalfa, Beckham, Blaine, Caddo, Canadian, Cherokee and 43 more | 94 min |
| May 6, 1:47 PM CDT | Mesoscale Discussion | SPC | Beckham, Ellis, Greer, Harmon, Harper, Jackson and 3 more | 58 min |
| May 6, 1:59 PM CDT | Tornado Watch | SPC | Alfalfa, Beaver, Beckham, Blaine, Caddo, Canadian and 36 more | 8 hr |
| May 6, 2:36 PM CDT | Tornado Watch | SPC | Brown, Callahan, Coke, Coleman, Concho, Crockett and 23 more | 7 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; radar from the NEXRAD Level II archive.