Alert archive / Texas / Tornado Watches in 2009
Tornado Watch 805
The Storm Prediction Center issued this tornado watch at Dec 23, 2009, 1:59 PM CST for 4 states. It was in force for 7 hr.
The area
The outline as issued.
The facts
- Issued
- Dec 23, 2009, 1:59 PM CST (19:59 UTC)
- Expired
- Dec 23, 2009, 9:00 PM CST
- In force
- 7 hr
- Issued by
- the Storm Prediction Center
- Largest hail expected
- 1 in
- Strongest gust expected
- 60 kt
All 69 counties
Miller County, AR, Beauregard Parish, LA, Bossier Parish, LA, Caddo Parish, LA, De Soto Parish, LA, Natchitoches Parish, LA, Red River Parish, LA, Sabine Parish, LA, Vernon Parish, LA, Atoka County, OK, Bryan County, OK, Choctaw County, OK, Latimer County, OK, McCurtain County, OK, Pittsburg County, OK, Pushmataha County, OK, Anderson County, TX, Angelina County, TX, Austin County, TX, Bowie County, TX, Brazos County, TX, Burleson County, TX, Camp County, TX, Cass County, TX, Cherokee County, TX, Delta County, TX, Fannin County, TX, Franklin County, TX, Freestone County, TX, Gregg County, TX, Grimes County, TX, Harrison County, TX, Henderson County, TX, Hopkins County, TX, Houston County, TX, Hunt County, TX, Jasper County, TX, Kaufman County, TX, Lamar County, TX, Leon County, TX, Limestone County, TX, Madison County, TX, Marion County, TX, Montgomery County, TX, Morris County, TX, Nacogdoches County, TX, Navarro County, TX, Newton County, TX, Panola County, TX, Polk County, TX, Rains County, TX, Red River County, TX, Robertson County, TX, Rockwall County, TX, Rusk County, TX, Sabine County, TX, San Augustine County, TX, San Jacinto County, TX, Shelby County, TX, Smith County, TX, Titus County, TX, Trinity County, TX, Tyler County, TX, Upshur County, TX, Van Zandt County, TX, Walker County, TX, Waller County, TX, Washington County, TX, Wood County, TX
The radar
The Shreveport radar (KSHV), 124 km from the middle of the area, began a volume at 19:59 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
- 40%
- Ten or more severe wind reports
- 30%
- One or more gusts of 65 knots or more
- 10%
- Ten or more severe hail reports
- 20%
- One or more hailstones of 2 inches or more
- 5%
- Six or more combined severe hail and wind reports
- 90%
Warnings issued inside it
19 tornado, severe thunderstorm and flash flood warnings for its counties while it was in force.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Dec 23, 2:31 PM CST | Severe Thunderstorm Warning | TSA | Pittsburg | 33 min |
| Dec 23, 2:42 PM CST | Tornado Warning | SHV | Cherokee, Rusk, Smith | 48 min |
| Dec 23, 3:39 PM CST | Severe Thunderstorm Warning | SHV | Red River | 40 min |
| Dec 23, 4:24 PM CST | Tornado Warning | SHV | Gregg, Harrison | 51 min |
| Dec 23, 5:10 PM CST | Tornado Warning | SHV | Harrison, Marion | 35 min |
| Dec 23, 5:13 PM CST | Tornado Warning | HGX | Houston, Trinity, Walker | 47 min |
| Dec 23, 5:15 PM CST | Tornado Warning | SHV | Rusk | 30 min |
| Dec 23, 5:49 PM CST | Tornado Warning | SHV | Cass, Marion | 26 min |
| Dec 23, 6:01 PM CST | Severe Thunderstorm Warning | HGX | Houston | 44 min |
| Dec 23, 6:12 PM CST | Tornado Warning | SHV | Cass | 33 min |
| Dec 23, 6:36 PM CST | Severe Thunderstorm Warning | SHV | Cherokee, Nacogdoches, Rusk | 24 min |
| Dec 23, 6:40 PM CST | Tornado Warning | SHV | Bowie, Cass | 50 min |
| Dec 23, 6:58 PM CST | Tornado Warning | SHV | Cass, Marion | 32 min |
| Dec 23, 7:12 PM CST | Tornado Warning | SHV | Rusk | 48 min |
| Dec 23, 7:25 PM CST | Tornado Warning | SHV | Miller | 35 min |
| Dec 23, 7:28 PM CST | Flash Flood Warning | SHV | Miller | 4 hr |
| Dec 23, 7:45 PM CST | Tornado Warning | SHV | Rusk | 35 min |
| Dec 23, 8:31 PM CST | Severe Thunderstorm Warning | SHV | Lafayette, Miller | 44 min |
| Dec 23, 8:45 PM CST | Tornado Warning | SHV | Harrison, Marion | 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
Shreveport, LA (KSHV), launched 12:00Z, 8.0 hours before the alert went out and 132 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
- 12 J/kg
- Mixed-layer CIN
- -129 J/kg
- Mixed-layer LCL
- 489 m above ground
- 0-6 km bulk shear
- 43 kt
- 0-1 km storm-relative helicity
- 377 m²/s²
- 0-3 km storm-relative helicity
- 435 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.4
SPC that day
Everything else SPC issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Dec 23, 2:37 AM CST | Mesoscale Discussion | SPC | Crawford, Howard, Little River, Miller, Polk, Scott and 2 more | 2 hr |
| Dec 23, 10:31 AM CST | Mesoscale Discussion | SPC | Benton | 89 min |
| Dec 23, 5:21 PM CST | Mesoscale Discussion | SPC | Lafayette, Miller | 114 min |
| Dec 23, 12:18 PM CST | Mesoscale Discussion | SPC | Atoka, Bryan, Carter, Choctaw, Coal, Creek and 17 more | 57 min |
| Dec 23, 1:03 PM CST | Mesoscale Discussion | SPC | Choctaw | 57 min |
| Dec 23, 3:00 PM CST | Mesoscale Discussion | SPC | Bosque, Comanche, Cooke, Dallas, Denton, Erath and 8 more | 60 min |
Nearby
Tornado Watches in Texas, 2009Tornado Watches in Louisiana, 2009Tornado Watches in Oklahoma, 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.