Alert archive / Oklahoma / Tornado Watches in 2007

Tornado Watch 243

May 6, 200714 counties in Kansas; 43 counties in Oklahoma; 8 counties in Texas

The Storm Prediction Center issued this tornado watch at May 6, 2007, 9:19 AM CDT for 14 counties in Kansas; 43 counties in Oklahoma; 8 counties in Texas. It was in force for 5 hr.

The area

The outline as issued.

The facts

Issued
May 6, 2007, 9:19 AM CDT (14:19 UTC)
Expired
May 6, 2007, 2:01 PM CDT
In force
5 hr
Issued by
the Storm Prediction Center
Largest hail expected
2.5 in
Strongest gust expected
60 kt
All 65 counties

Allen County, KS, Bourbon County, KS, Chautauqua County, KS, Cherokee County, KS, Cowley County, KS, Crawford County, KS, Elk County, KS, Greenwood County, KS, Labette County, KS, Montgomery County, KS, Neosho County, KS, Sumner County, KS, Wilson County, KS, Woodson County, KS, Alfalfa County, OK, Beckham County, OK, Blaine County, OK, Caddo County, OK, Canadian County, OK, Cleveland County, OK, Comanche County, OK, Cotton County, OK, Craig County, OK, Creek County, OK, Custer County, OK, Dewey County, OK, Garfield County, OK, Garvin County, OK, Grady County, OK, Grant County, OK, Greer County, OK, Harmon County, OK, Jackson County, OK, Jefferson County, OK, Kay County, OK, Kingfisher County, OK, Kiowa County, OK, Lincoln County, OK, Logan County, OK, Major County, OK, McClain County, OK, Noble County, OK, Nowata County, OK, Okfuskee County, OK, Oklahoma County, OK, Osage County, OK, Ottawa County, OK, Pawnee County, OK, Payne County, OK, Pottawatomie County, OK, Rogers County, OK, Seminole County, OK, Stephens County, OK, Tillman County, OK, Tulsa County, OK, Washington County, OK, Washita County, OK, Archer County, TX, Baylor County, TX, Clay County, TX, Foard County, TX, Hardeman County, TX, Knox County, TX, Wichita County, TX, Wilbarger County, TX

The radar

The Vance AFB radar (KVNX), 83 km from the middle of the area, began a volume at 14:19 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
50%
One or more EF2 to EF5 tornadoes
20%
Ten or more severe wind reports
30%
One or more gusts of 65 knots or more
30%
Ten or more severe hail reports
60%
One or more hailstones of 2 inches or more
30%
Six or more combined severe hail and wind reports
80%

Warnings issued inside it

9 tornado, severe thunderstorm and flash flood warnings for its counties while it was in force.

IssuedProductOfficeCountiesLasted
May 6, 9:31 AM CDTSevere Thunderstorm WarningOUNCuster, Dewey59 min
May 6, 9:59 AM CDTSevere Thunderstorm WarningOUNAlfalfa16 min
May 6, 10:08 AM CDTSevere Thunderstorm WarningOUNMajor, Woods52 min
May 6, 10:40 AM CDTSevere Thunderstorm WarningICTButler, Elk, Greenwood49 min
May 6, 10:53 AM CDTTornado WarningICTHarper, Kingman, Sedgwick, Sumner38 min
May 6, 11:17 AM CDTFlash Flood WarningICTHarper, Kingman, Reno, Sedgwick, Sumner4 hr
May 6, 12:13 PM CDTFlash Flood WarningICTHarper, Kingman, Reno, Sedgwick, Sumner9 hr
May 6, 12:13 PM CDTFlash Flood WarningICTHarper, Harvey, Kingman, Reno, Sedgwick, Sumner9 hr
May 6, 1:42 PM CDTSevere Thunderstorm WarningOUNBeckham33 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 12:00Z, 2.3 hours before the alert went out and 42 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.

Skew-T log-pSkew-T log-p diagram, Lamont, OK at 12:00Z on 2007-05-06Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 2828 joules per kilogram.LCLLFCEL10008507005003002001001 km2 km3 km6 km9 km12 km15 km-30°-20°-10°0°10°20°30°40°
Temperature in red, dew point in green, the mixed-layer parcel dashed.
HodographHodograph, Lamont, OK at 12:00Z on 2007-05-06The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 227 square meters per square second.193958Sfc1 km3 km6 km9 kmRMLM
The wind turning with height, colored by layer: ground to 1 km, 1 to 3 km, 3 to 6 km, 6 to 10 km.
Mixed-layer CAPE
2828 J/kg
Mixed-layer CIN
-8 J/kg
Mixed-layer LCL
674 m above ground
0-6 km bulk shear
44 kt
0-1 km storm-relative helicity
227 m²/s²
0-3 km storm-relative helicity
193 m²/s²
Significant tornado parameter
2.7
Supercell composite
11.6

Open this sounding in Storm Lab

The text

As transmitted, in the capitals the NWS used until 2016.

000
WWUS20 KWNS 061421
SEL3  
SPC WW 061421
KSZ000-OKZ000-TXZ000-062300-

URGENT - IMMEDIATE BROADCAST REQUESTED
TORNADO WATCH NUMBER 243
NWS STORM PREDICTION CENTER NORMAN OK
920 AM CDT SUN MAY 6 2007

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

       PARTS OF SOUTHEAST KANSAS
       MUCH OF WESTERN AND NORTHERN OKLAHOMA
       SMALL PART OF NORTHWEST TEXAS

EFFECTIVE THIS SUNDAY MORNING AND EVENING FROM 920 AM UNTIL 600
PM 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 95 STATUTE
MILES EAST AND WEST OF A LINE FROM 20 MILES NORTH NORTHWEST OF
CHANUTE KANSAS TO 50 MILES WEST SOUTHWEST OF WICHITA FALLS TEXAS.
 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.

DISCUSSION...STRONG THUNDERSTORMS ACROSS SCENTRAL KS TO SWRN OK
CURRENTLY...WILL CONTINUE TO INTENSIFY AS THEY DEVELOP EWD INTO A
VERY UNSTABLE AND WEAKLY CAPPED AIRMASS.  WITH MLCAPES TO 3000 J/KG
AND 25-30KT OF LOW LEVEL SHEAR.,.POTENTIAL FOR TORNADIC SUPERCELLS
WILL INCREASE AS THE STORMS CONTINUE EWD...PARTICULARLY BY MID
AFTERNOON.

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
550. MEAN STORM MOTION VECTOR 24025.


...HALES

SPC that day

Everything else SPC issued on the same UTC day.

IssuedProductOfficeCountiesLasted
May 5, 7:22 PM CDTTornado WatchSPCAtchison, Doniphan9 hr
May 5, 8:18 PM CDTMesoscale DiscussionSPCAllen, Anderson, Atchison, Butler, Chase, Coffey and 18 more57 min
May 5, 9:08 PM CDTTornado Watch PDSSPCAnderson, Barber, Barton, Brown, Butler, Chase and 64 more7 hr
May 5, 11:24 PM CDTMesoscale DiscussionSPCBarber, Barton, Clark, Cloud, Comanche, Edwards and 23 more66 min
May 6, 1:50 AM CDTMesoscale DiscussionSPCAnderson, Atchison, Barber, Barton, Brown, Butler and 48 more85 min
May 6, 7:10 AM CDTMesoscale DiscussionSPCCoffey, Franklin, Johnson, Wyandotte95 min
May 6, 11:41 AM CDTMesoscale DiscussionSPCAllen, Anderson, Barber, Barton, Bourbon, Butler and 36 more94 min
May 6, 1:47 PM CDTMesoscale DiscussionSPCClark58 min
May 6, 1:59 PM CDTTornado WatchSPCAllen, Barber, Bourbon, Butler, Chautauqua, Cherokee and 25 more8 hr
May 6, 5:38 PM CDTMesoscale DiscussionSPCAllen, Anderson, Bourbon, Butler, Chase, Chautauqua and 28 more67 min
May 6, 6:00 PM CDTSevere Thunderstorm WatchSPCAnderson, Chase, Clay, Cloud, Coffey, Dickinson and 18 more7 hr
May 5, 9:16 PM CDTMesoscale DiscussionSPCAtchison, Gentry, Harrison, Holt, Nodaway, Worth59 min
May 6, 4:08 AM CDTMesoscale DiscussionSPCAdair, Buchanan, Caldwell, Carroll, Clay, Clinton and 18 more2 hr
May 6, 4:40 AM CDTSevere Thunderstorm WatchSPCAdair, Daviess, Grundy, Harrison, Mercer, Putnam and 2 more4 hr
May 5, 7:34 PM CDTMesoscale DiscussionSPCTillman56 min
May 5, 7:48 PM CDTTornado WatchSPCComanche, Jackson, Tillman7 hr
May 5, 9:58 PM CDTTornado WatchSPCAlfalfa, Beaver, Beckham, Blaine, Custer, Dewey and 12 more7 hr
May 6, 3:37 AM CDTMesoscale DiscussionSPCAlfalfa, Beckham, Blaine, Custer, Dewey, Ellis and 9 more53 min
May 6, 7:50 AM CDTMesoscale DiscussionSPCAlfalfa, Beckham, Custer, Dewey, Greer, Harmon and 4 more85 min
May 6, 2:36 PM CDTTornado WatchSPCBrown, Callahan, Coke, Coleman, Concho, Crockett and 23 more7 hr

Nearby

Tornado Watches in Oklahoma, 2007Tornado Watches in Kansas, 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.