Alert archive / Oklahoma / Severe Thunderstorm Watches in 2007
Severe Thunderstorm Watch 309
The Storm Prediction Center issued this severe thunderstorm watch at May 30, 2007, 4:50 AM CDT for 15 counties in Oklahoma; 14 counties in Texas. It was in force for 6 hr.
The area
The outline as issued.
The facts
- Issued
- May 30, 2007, 4:50 AM CDT (09:50 UTC)
- Expired
- May 30, 2007, 11:00 AM CDT
- In force
- 6 hr
- Issued by
- the Storm Prediction Center
- Largest hail expected
- 2 in
- Strongest gust expected
- 60 kt
All 29 counties
Bryan County, OK, Carter County, OK, Comanche County, OK, Cotton County, OK, Garvin County, OK, Grady County, OK, Jackson County, OK, Jefferson County, OK, Johnston County, OK, Love County, OK, Marshall County, OK, McClain County, OK, Murray County, OK, Stephens County, OK, Tillman County, OK, Clay County, TX, Collin County, TX, Cooke County, TX, Dallas County, TX, Denton County, TX, Fannin County, TX, Grayson County, TX, Hunt County, TX, Jack County, TX, Montague County, TX, Rockwall County, TX, Tarrant County, TX, Wichita County, TX, Wise County, TX
The radar
The Altus AFB radar (KFDR), 118 km from the middle of the area, began a volume at 09:53 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.
What SPC expected
The probabilities SPC published with the watch, for the watch area over its life.
- Two or more tornadoes
- 10%
- One or more EF2 to EF5 tornadoes
- 5%
- Ten or more severe wind reports
- 40%
- One or more gusts of 65 knots or more
- 30%
- 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
- 70%
Warnings issued inside it
33 tornado, severe thunderstorm and flash flood warnings for its counties while it was in force.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| May 30, 4:59 AM CDT | Severe Thunderstorm Warning | OUN | Caddo, Canadian, Cleveland, Grady, McClain, Oklahoma | 46 min |
| May 30, 5:06 AM CDT | Severe Thunderstorm Warning | OUN | Carter, Love, Marshall | 39 min |
| May 30, 5:08 AM CDT | Severe Thunderstorm Warning | OUN | Comanche, Jackson, Kiowa, Tillman | 52 min |
| May 30, 5:15 AM CDT | Severe Thunderstorm Warning | OUN | Garvin | 45 min |
| May 30, 5:37 AM CDT | Severe Thunderstorm Warning | OUN | Johnston, Marshall | 38 min |
| May 30, 5:41 AM CDT | Severe Thunderstorm Warning | OUN | Cleveland, Garvin, Grady, McClain, Stephens | 49 min |
| May 30, 6:11 AM CDT | Severe Thunderstorm Warning | OUN | Carter, Love | 49 min |
| May 30, 6:12 AM CDT | Severe Thunderstorm Warning | FWD | Fannin | 63 min |
| May 30, 6:20 AM CDT | Severe Thunderstorm Warning | OUN | Garvin, Johnston, Murray, Pontotoc, Seminole | 70 min |
| May 30, 6:56 AM CDT | Severe Thunderstorm Warning | OUN | Carter, Jefferson, Love | 49 min |
| May 30, 7:20 AM CDT | Flash Flood Warning | FWD | Fannin, Hunt | 3 hr |
| May 30, 7:24 AM CDT | Severe Thunderstorm Warning | OUN | Clay | 51 min |
| May 30, 7:28 AM CDT | Severe Thunderstorm Warning | FWD | Cooke, Montague | 62 min |
| May 30, 7:30 AM CDT | Severe Thunderstorm Warning | OUN | Atoka, Bryan, Coal, Johnston, Marshall | 60 min |
| May 30, 7:30 AM CDT | Severe Thunderstorm Warning | FWD | Hunt | 60 min |
| May 30, 7:43 AM CDT | Flash Flood Warning | FWD | Cooke | 3 hr |
| May 30, 7:44 AM CDT | Severe Thunderstorm Warning | FWD | Fannin | 61 min |
| May 30, 7:49 AM CDT | Flash Flood Warning | OUN | Atoka, Bryan | 3 hr |
| May 30, 7:49 AM CDT | Flash Flood Warning | OUN | Atoka, Beckham, Blaine, Bryan, Caddo, Canadian and 37 more | 111 days |
| May 30, 8:19 AM CDT | Severe Thunderstorm Warning | FWD | Cooke, Denton, Montague, Wise | 56 min |
| May 30, 8:39 AM CDT | Severe Thunderstorm Warning | FWD | Hunt | 51 min |
| May 30, 8:47 AM CDT | Severe Thunderstorm Warning | FWD | Fannin, Hunt | 58 min |
| May 30, 8:49 AM CDT | Severe Thunderstorm Warning | FWD | Collin | 56 min |
| May 30, 9:04 AM CDT | Flash Flood Warning | FWD | Collin, Denton | 3 hr |
| May 30, 9:17 AM CDT | Flash Flood Warning | FWD | Grayson | 118 min |
| May 30, 9:18 AM CDT | Severe Thunderstorm Warning | FWD | Dallas, Denton, Tarrant | 57 min |
| May 30, 9:27 AM CDT | Severe Thunderstorm Warning | FWD | Hunt | 63 min |
| May 30, 9:36 AM CDT | Severe Thunderstorm Warning | FWD | Rockwall | 54 min |
| May 30, 9:45 AM CDT | Severe Thunderstorm Warning | FWD | Collin | 45 min |
| May 30, 9:47 AM CDT | Flash Flood Warning | FWD | Dallas, Tarrant | 3 hr |
| May 30, 9:47 AM CDT | Flash Flood Warning | FWD | Dallas, Rockwall, Tarrant | 3 hr |
| May 30, 10:03 AM CDT | Flash Flood Warning | FWD | Fannin, Hunt | 3 hr |
| May 30, 10:22 AM CDT | Severe Thunderstorm Warning | FWD | Dallas | 42 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
Fort Worth, TX (KFWD), launched 00:00Z, 9.8 hours before the alert went out and 143 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
- 48 J/kg
- Mixed-layer CIN
- -228 J/kg
- Mixed-layer LCL
- 1040 m above ground
- 0-6 km bulk shear
- 29 kt
- 0-1 km storm-relative helicity
- -11 m²/s²
- 0-3 km storm-relative helicity
- 91 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- -0.1
SPC that day
Everything else SPC issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| May 29, 9:02 PM CDT | Mesoscale Discussion | SPC | Beaver, Harper, Texas | 118 min |
| May 30, 1:52 AM CDT | Mesoscale Discussion | SPC | Alfalfa, Beckham, Blaine, Custer, Dewey, Ellis and 5 more | 83 min |
| May 30, 4:11 AM CDT | Mesoscale Discussion | SPC | Caddo, Canadian, Comanche, Cotton, Grady, Greer and 7 more | 94 min |
| May 30, 7:42 AM CDT | Mesoscale Discussion | SPC | Bryan, Carter, Cotton, Garvin, Jefferson, Johnston and 5 more | 93 min |
| May 29, 7:53 PM CDT | Mesoscale Discussion | SPC | Bell, Brown, Burnet, Coleman, Coryell, Lampasas and 5 more | 2 hr |
| May 30, 8:59 AM CDT | Severe Thunderstorm Watch | SPC | Anderson, Angelina, Austin, Bell, Bosque, Bowie and 63 more | 5 hr |
| May 30, 11:07 AM CDT | Mesoscale Discussion | SPC | Anderson, Angelina, Austin, Brazos, Burleson, Camp and 45 more | 83 min |
| May 30, 1:23 PM CDT | Mesoscale Discussion | SPC | Angelina, Chambers, Hardin, Jasper, Jefferson, Liberty and 10 more | 97 min |
| May 30, 6:13 PM CDT | Mesoscale Discussion | SPC | Bandera, Brown, Callahan, Coleman, Comanche, Concho and 18 more | 92 min |
Nearby
Severe Thunderstorm Watches in Oklahoma, 2007Severe Thunderstorm Watches in Texas, 2007Every severe thunderstorm 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.