Alert archive / Texas / Tornado Watches in 2009
Tornado Watch 78
The Storm Prediction Center issued this tornado watch at Mar 27, 2009, 12:58 PM CDT for 4 counties in Arkansas; 7 counties in Oklahoma; 34 counties in Texas. It was in force for 7 hr.
The area
The outline as issued.
The facts
- Issued
- Mar 27, 2009, 12:58 PM CDT (17:58 UTC)
- Expired
- Mar 27, 2009, 8:00 PM CDT
- In force
- 7 hr
- Issued by
- the Storm Prediction Center
- Largest hail expected
- 2 in
- Strongest gust expected
- 60 kt
All 45 counties
Howard County, AR, Little River County, AR, Miller County, AR, Sevier County, AR, Atoka County, OK, Bryan County, OK, Choctaw County, OK, LeFlore County, OK, Marshall County, OK, McCurtain County, OK, Pushmataha County, OK, Anderson County, TX, Angelina County, TX, Bowie County, TX, Camp County, TX, Cass County, TX, Cherokee County, TX, Collin County, TX, Delta County, TX, Fannin County, TX, Franklin County, TX, Grayson County, TX, Gregg County, TX, Harrison County, TX, Henderson County, TX, Hopkins County, TX, Hunt County, TX, Kaufman County, TX, Lamar County, TX, Marion County, TX, Morris County, TX, Nacogdoches County, TX, Panola County, TX, Rains County, TX, Red River County, TX, Rockwall County, TX, Rusk County, TX, Sabine County, TX, San Augustine County, TX, Shelby County, TX, Smith County, TX, Titus County, TX, Upshur County, TX, Van Zandt County, TX, Wood County, TX
The radar
The Shreveport radar (KSHV), 171 km from the middle of the area, began a volume at 18:02 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
- 40%
- One or more EF2 to EF5 tornadoes
- 20%
- Ten or more severe wind reports
- 50%
- One or more gusts of 65 knots or more
- 30%
- Ten or more severe hail reports
- 50%
- One or more hailstones of 2 inches or more
- 30%
- Six or more combined severe hail and wind reports
- 80%
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 |
|---|---|---|---|---|
| Mar 27, 1:00 PM CDT | Severe Thunderstorm Warning | FWD | Henderson, Hunt, Kaufman, Navarro, Rains, Van Zandt | 46 min |
| Mar 27, 6:02 PM CDT | Severe Thunderstorm Warning | TSA | Latimer, LeFlore, Pushmataha | 58 min |
| Mar 27, 6:35 PM CDT | Severe Thunderstorm Warning | TSA | LeFlore, Pushmataha | 55 min |
| Mar 27, 6:43 PM CDT | Tornado Warning | SHV | McCurtain | 26 min |
| Mar 27, 6:54 PM CDT | Tornado Warning | TSA | LeFlore, Pushmataha | 66 min |
| Mar 27, 7:46 PM CDT | Tornado Warning | TSA | LeFlore | 44 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 12:00Z, 6.0 hours before the alert went out and 165 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
- 542 J/kg
- Mixed-layer CIN
- -157 J/kg
- Mixed-layer LCL
- 460 m above ground
- 0-6 km bulk shear
- 59 kt
- 0-1 km storm-relative helicity
- 165 m²/s²
- 0-3 km storm-relative helicity
- 134 m²/s²
- Significant tornado parameter
- 0.1
- Supercell composite
- 1.1
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 | Howard, Montgomery, Polk, Scott, Sevier | 62 min |
| Mar 27, 12:33 PM CDT | Mesoscale Discussion | SPC | Hempstead, Howard, Lafayette, Little River, Miller, Sevier | 57 min |
| Mar 27, 3:34 PM CDT | Mesoscale Discussion | SPC | Howard, Little River, Miller, Sevier | 56 min |
| Mar 27, 5:53 PM CDT | Mesoscale Discussion | SPC | Ashley, Bradley, Calhoun, Chicot, Clark, Cleveland and 16 more | 97 min |
| Mar 27, 6:35 PM CDT | Tornado Watch | SPC | Arkansas, Ashley, Bradley, Calhoun, Chicot, Clark and 27 more | 7 hr |
| Mar 26, 7:32 PM CDT | Severe Thunderstorm Watch | SPC | Atoka, Bryan, Carter, Coal, Jefferson, Johnston and 3 more | 4 hr |
| 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 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 |
Nearby
Tornado Watches in Texas, 2009Tornado Watches in Oklahoma, 2009Tornado Watches in Arkansas, 2009Every tornado 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.