Alert archive / Oklahoma / Severe Thunderstorm Watches in 2009
Severe Thunderstorm Watch 73
The Storm Prediction Center issued this severe thunderstorm watch at Mar 26, 2009, 7:32 PM CDT for 9 counties in Oklahoma; 7 counties in Texas. It was in force for 4 hr.
The area
The outline as issued.
The facts
- Issued
- Mar 26, 2009, 7:32 PM CDT (00:32 UTC)
- Expired
- Mar 26, 2009, 11:54 PM CDT
- In force
- 4 hr
- Issued by
- the Storm Prediction Center
- Largest hail expected
- 2 in
- Strongest gust expected
- 60 kt
Counties Atoka County, OK, Bryan County, OK, Carter County, OK, Coal County, OK, Jefferson County, OK, Johnston County, OK, Love County, OK, Marshall County, OK, Murray County, OK, Cooke County, TX, Denton County, TX, Fannin County, TX, Grayson County, TX, Jack County, TX, Montague County, TX, Wise County, TX
The radar
The Norman radar (KTLX), 151 km from the middle of the area, began a volume at 00:36 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
- 20%
- One or more EF2 to EF5 tornadoes
- 5%
- Ten or more severe wind reports
- 30%
- 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
7 tornado, severe thunderstorm and flash flood warnings for its counties while it was in force.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Mar 26, 7:40 PM CDT | Tornado Warning | FWD | Cooke | 50 min |
| Mar 26, 8:29 PM CDT | Tornado Warning | FWD | Cooke | 61 min |
| Mar 26, 8:31 PM CDT | Severe Thunderstorm Warning | FWD | Montague | 14 min |
| Mar 26, 9:02 PM CDT | Tornado Warning | FWD | Grayson | 58 min |
| Mar 26, 9:28 PM CDT | Tornado Warning | FWD | Cooke, Grayson | 62 min |
| Mar 26, 9:59 PM CDT | Tornado Warning | FWD | Grayson | 61 min |
| Mar 26, 10:33 PM CDT | Severe Thunderstorm Warning | FWD | Fannin | 57 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, 0.5 hours before the alert went out and 128 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
- 441 J/kg
- Mixed-layer CIN
- -163 J/kg
- Mixed-layer LCL
- 1511 m above ground
- 0-6 km bulk shear
- 60 kt
- 0-1 km storm-relative helicity
- 259 m²/s²
- 0-3 km storm-relative helicity
- 293 m²/s²
- Significant tornado parameter
- 0.1
- Supercell composite
- 2.2
SPC that day
Everything else SPC issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Mar 26, 9:28 PM CDT | Mesoscale Discussion | SPC | Choctaw, LeFlore, McCurtain, Pushmataha | 62 min |
| Mar 26, 11:34 PM CDT | Mesoscale Discussion | SPC | Cimarron, Texas | 4 hr |
| Mar 27, 2:55 AM CDT | Mesoscale Discussion | SPC | Beaver, Cimarron, Texas | 4 hr |
| Mar 27, 6:50 AM CDT | Mesoscale Discussion | SPC | Alfalfa, Blaine, Canadian, Creek, Dewey, Garfield and 14 more | 85 min |
| Mar 27, 8:04 AM CDT | Mesoscale Discussion | SPC | Alfalfa, Beaver, Beckham, Custer, Dewey, Ellis and 7 more | 4 hr |
| Mar 27, 12:30 PM CDT | Mesoscale Discussion | SPC | Alfalfa, Beaver, Beckham, Blaine, Caddo, Canadian and 19 more | 6 hr |
| Mar 27, 12:33 PM CDT | Mesoscale Discussion | SPC | Bryan, Choctaw, McCurtain | 57 min |
| Mar 27, 12:58 PM CDT | Tornado Watch | SPC | Atoka, Bryan, Choctaw, LeFlore, McCurtain, Marshall and 1 more | 7 hr |
| Mar 27, 3:34 PM CDT | Mesoscale Discussion | SPC | Atoka, Bryan, Choctaw, McCurtain, Marshall, Pushmataha | 56 min |
| Mar 26, 9:13 PM CDT | Mesoscale Discussion | SPC | Angelina, Cherokee, Hardin, Jasper, Jefferson, Nacogdoches and 6 more | 92 min |
| Mar 27, 10:24 AM CDT | Mesoscale Discussion | SPC | Anderson, Angelina, Austin, Bastrop, Bell, Brazoria and 43 more | 96 min |
| Mar 27, 11:48 AM CDT | Severe Thunderstorm Watch | SPC | Austin, Brazos, Burleson, Chambers, Grimes, Hardin and 16 more | 5 hr |
| Mar 27, 3:43 PM CDT | Mesoscale Discussion | SPC | Chambers, Hardin, Harris, Jasper, Jefferson, Liberty and 6 more | 62 min |
| Mar 27, 4:49 PM CDT | Tornado Watch | SPC | Brazoria, Chambers, Galveston, Hardin, Harris, Jasper and 6 more | 3 hr |
| Mar 27, 5:53 PM CDT | Mesoscale Discussion | SPC | Bowie, Cass | 97 min |
| Mar 27, 6:35 PM CDT | Tornado Watch | SPC | Angelina, Bowie, Camp, Cass, Cherokee, Gregg and 10 more | 7 hr |
Nearby
Severe Thunderstorm Watches in Oklahoma, 2009Severe Thunderstorm Watches in Texas, 2009Every severe thunderstorm watch in 2009
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.