Alert archive / Texas / Tornado Watches in 2010
Tornado Watch 89
The Storm Prediction Center issued this tornado watch at Apr 24, 2010, 1:50 AM CDT for 9 counties in Arkansas; 17 parishes in Louisiana; 21 counties in Texas. It was in force for 8 hr.
The area
The outline as issued.
The facts
- Issued
- Apr 24, 2010, 1:50 AM CDT (06:50 UTC)
- Expired
- Apr 24, 2010, 10:00 AM CDT
- In force
- 8 hr
- Issued by
- the Storm Prediction Center
- Largest hail expected
- 3 in
- Strongest gust expected
- 70 kt
All 47 counties
Columbia County, AR, Hempstead County, AR, Howard County, AR, Lafayette County, AR, Little River County, AR, Miller County, AR, Nevada County, AR, Sevier County, AR, Union County, AR, Bienville Parish, LA, Bossier Parish, LA, Caddo Parish, LA, Caldwell Parish, LA, Claiborne Parish, LA, De Soto Parish, LA, Grant Parish, LA, Jackson Parish, LA, LaSalle Parish, LA, Lincoln Parish, LA, Natchitoches Parish, LA, Ouachita Parish, LA, Red River Parish, LA, Sabine Parish, LA, Union Parish, LA, Webster Parish, LA, Winn Parish, LA, Angelina County, TX, Bowie County, TX, Camp County, TX, Cass County, TX, Cherokee County, TX, Franklin County, TX, Gregg County, TX, Harrison County, TX, Marion County, TX, Morris County, TX, Nacogdoches County, TX, Panola County, TX, Red River County, TX, Rusk County, TX, Sabine County, TX, San Augustine County, TX, Shelby County, TX, Smith County, TX, Titus County, TX, Upshur County, TX, Wood County, TX
The radar
The Shreveport radar (KSHV), 53 km from the middle of the area, began a volume at 06:53 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
- 40%
- One or more EF2 to EF5 tornadoes
- 20%
- Ten or more severe wind reports
- 70%
- One or more gusts of 65 knots or more
- 60%
- Ten or more severe hail reports
- 70%
- One or more hailstones of 2 inches or more
- 50%
- Six or more combined severe hail and wind reports
- 90%
Warnings issued inside it
16 tornado, severe thunderstorm and flash flood warnings for its counties while it was in force.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Apr 24, 1:57 AM CDT | Severe Thunderstorm Warning | SHV | Smith, Wood | 63 min |
| Apr 24, 2:27 AM CDT | Tornado Warning | SHV | Wood | 19 min |
| Apr 24, 2:41 AM CDT | Severe Thunderstorm Warning | SHV | Camp, Franklin, Gregg, Morris, Titus, Upshur | 49 min |
| Apr 24, 3:14 AM CDT | Severe Thunderstorm Warning | SHV | Bowie, Cass, Harrison, Marion, Red River | 46 min |
| Apr 24, 3:55 AM CDT | Severe Thunderstorm Warning | SHV | Hempstead, Howard, Little River, Nevada, Sevier | 50 min |
| Apr 24, 5:25 AM CDT | Severe Thunderstorm Warning | SHV | Union | 50 min |
| Apr 24, 5:40 AM CDT | Severe Thunderstorm Warning | SHV | Bossier, Caddo, Webster | 35 min |
| Apr 24, 5:51 AM CDT | Tornado Warning | SHV | Bossier, Claiborne, Webster | 39 min |
| Apr 24, 5:54 AM CDT | Severe Thunderstorm Warning | SHV | Bienville, Claiborne, Lincoln, Union | 51 min |
| Apr 24, 6:23 AM CDT | Tornado Warning | SHV | Union | 52 min |
| Apr 24, 7:07 AM CDT | Severe Thunderstorm Warning | SHV | Union | 38 min |
| Apr 24, 7:12 AM CDT | Tornado Warning | SHV | Union | 33 min |
| Apr 24, 7:23 AM CDT | Severe Thunderstorm Warning | SHV | De Soto, Natchitoches, Red River, Sabine | 52 min |
| Apr 24, 7:43 AM CDT | Severe Thunderstorm Warning | SHV | Natchitoches, Sabine | 47 min |
| Apr 24, 8:01 AM CDT | Severe Thunderstorm Warning | SHV | Bienville, Jackson, Lincoln, Natchitoches, Red River, Winn | 44 min |
| Apr 24, 8:38 AM CDT | Severe Thunderstorm Warning | SHV | Grant, Jackson, Natchitoches, Winn | 52 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 00:00Z, 6.8 hours before the alert went out and 62 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
- 2092 J/kg
- Mixed-layer CIN
- -15 J/kg
- Mixed-layer LCL
- 810 m above ground
- 0-6 km bulk shear
- 46 kt
- 0-1 km storm-relative helicity
- 155 m²/s²
- 0-3 km storm-relative helicity
- 153 m²/s²
- Significant tornado parameter
- 1.6
- Supercell composite
- 8.6
SPC that day
Everything else SPC issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Apr 23, 11:40 PM CDT | Mesoscale Discussion | SPC | Arkansas, Bradley, Calhoun, Clay, Cleveland, Craighead and 25 more | 65 min |
| Apr 24, 1:20 AM CDT | Mesoscale Discussion | SPC | Columbia, Lafayette | 25 min |
| Apr 24, 2:44 AM CDT | Mesoscale Discussion | SPC | Arkansas, Cleburne, Cleveland, Craighead, Crittenden, Cross and 24 more | 91 min |
| Apr 24, 3:02 AM CDT | Tornado Watch | SPC | Arkansas, Bradley, Calhoun, Clark, Cleveland, Dallas and 14 more | 8 hr |
| Apr 24, 5:01 AM CDT | Mesoscale Discussion | SPC | Ashley, Bradley, Calhoun, Chicot, Columbia, Drew and 2 more | 89 min |
| Apr 24, 6:00 AM CDT | Tornado Watch | SPC | Ashley, Chicot, Clay, Craighead, Crittenden, Cross and 8 more | 6 hr |
| Apr 24, 7:25 AM CDT | Mesoscale Discussion | SPC | Arkansas, Ashley, Bradley, Cleveland, Drew, Jefferson and 3 more | 95 min |
| Apr 24, 9:31 AM CDT | Mesoscale Discussion | SPC | Arkansas, Ashley, Chicot, Cleveland, Crittenden, Cross and 12 more | 59 min |
| Apr 24, 11:08 AM CDT | Mesoscale Discussion | SPC | Arkansas, Baxter, Clay, Cleburne, Conway, Craighead and 24 more | 67 min |
| Apr 24, 11:31 AM CDT | Tornado Watch | SPC | Clay, Craighead, Crittenden, Cross, Greene, Lawrence and 6 more | 8 hr |
| Apr 24, 1:52 PM CDT | Mesoscale Discussion | SPC | Baxter, Boone, Marion | 53 min |
| Apr 24, 2:01 PM CDT | Mesoscale Discussion | SPC | Clay, Craighead, Crittenden, Greene, Mississippi, Poinsett | 89 min |
| Apr 24, 6:15 AM CDT | Tornado Watch | SPC | Acadia, Allen, Ascension, Assumption, Avoyelles, Beauregard and 32 more | 7 hr |
| Apr 24, 10:28 AM CDT | Mesoscale Discussion | SPC | Avoyelles, Catahoula, Concordia, East Baton Rouge, East Feliciana, Franklin and 10 more | 92 min |
| Apr 24, 12:47 PM CDT | Tornado Watch | SPC | Ascension, Jefferson, Lafourche, Livingston, Orleans, Plaquemines and 8 more | 7 hr |
| Apr 23, 7:57 PM CDT | Mesoscale Discussion | SPC | Bandera, Bell, Bexar, Blanco, Bosque, Brown and 38 more | 63 min |
| Apr 23, 9:34 PM CDT | Tornado Watch | SPC | Atascosa, Austin, Bandera, Bastrop, Bexar, Blanco and 39 more | 7 hr |
| Apr 23, 11:16 PM CDT | Severe Thunderstorm Watch | SPC | Bosque, Collin, Coryell, Dallas, Denton, Ellis and 12 more | 4 hr |
Nearby
Tornado Watches in Texas, 2010Tornado Watches in Louisiana, 2010Tornado Watches in Arkansas, 2010Every tornado watch in 2010
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.