Alert archive / Texas / Severe Thunderstorm Watches in 2012
Severe Thunderstorm Watch 127
The Storm Prediction Center issued this severe thunderstorm watch at Apr 2, 2012, 12:41 PM CDT for 4 states. It was in force for 6 hr.
The area
The outline as issued.
The facts
- Issued
- Apr 2, 2012, 12:41 PM CDT (17:41 UTC)
- Expired
- Apr 2, 2012, 7:00 PM CDT
- In force
- 6 hr
- Issued by
- the Storm Prediction Center
- Largest hail expected
- 2 in
- Strongest gust expected
- 60 kt
All 46 counties
Bradley County, AR, Calhoun County, AR, Clark County, AR, Cleveland County, AR, Columbia County, AR, Dallas County, AR, Drew County, AR, Hempstead County, AR, Howard County, AR, Lafayette County, AR, Little River County, AR, Miller County, AR, Nevada County, AR, Ouachita County, AR, Pike County, AR, Sevier County, AR, Union County, AR, Claiborne Parish, LA, Lincoln Parish, LA, Ouachita Parish, LA, Union Parish, LA, Webster Parish, LA, Choctaw County, OK, McCurtain County, OK, Pushmataha County, OK, Anderson County, TX, Bowie County, TX, Camp County, TX, Cass County, TX, Delta County, TX, Fannin County, TX, Franklin County, TX, Henderson County, TX, Hopkins County, TX, Hunt County, TX, Kaufman County, TX, Lamar County, TX, Marion County, TX, Morris County, TX, Navarro County, TX, Rains County, TX, Red River County, TX, Titus County, TX, Upshur County, TX, Van Zandt County, TX, Wood County, TX
The radar
The Shreveport radar (KSHV), 130 km from the middle of the area, began a volume at 17:42 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
- 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
- 80%
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 2, 1:30 PM CDT | Severe Thunderstorm Warning | SHV | Bienville, Bossier, Caddo, Webster | 45 min |
| Apr 2, 1:46 PM CDT | Severe Thunderstorm Warning | FWD | Henderson, Van Zandt | 59 min |
| Apr 2, 1:52 PM CDT | Severe Thunderstorm Warning | SHV | Bienville, Caldwell, Claiborne, Jackson, Lincoln, Ouachita and 2 more | 38 min |
| Apr 2, 2:13 PM CDT | Severe Thunderstorm Warning | SHV | Columbia, Lafayette, Miller | 62 min |
| Apr 2, 2:22 PM CDT | Severe Thunderstorm Warning | SHV | Union | 53 min |
| Apr 2, 2:22 PM CDT | Severe Thunderstorm Warning | FWD | Rains, Van Zandt | 31 min |
| Apr 2, 2:24 PM CDT | Severe Thunderstorm Warning | FWD | Hopkins | 66 min |
| Apr 2, 2:38 PM CDT | Severe Thunderstorm Warning | SHV | Franklin, Red River, Titus | 67 min |
| Apr 2, 2:58 PM CDT | Severe Thunderstorm Warning | SHV | Columbia, Hempstead, Howard, Lafayette, Little River, Miller and 2 more | 62 min |
| Apr 2, 3:00 PM CDT | Severe Thunderstorm Warning | FWD | Delta | 45 min |
| Apr 2, 3:08 PM CDT | Severe Thunderstorm Warning | SHV | Union | 37 min |
| Apr 2, 3:09 PM CDT | Severe Thunderstorm Warning | LZK | Bradley, Calhoun, Clark, Ouachita | 66 min |
| Apr 2, 3:45 PM CDT | Severe Thunderstorm Warning | SHV | McCurtain | 60 min |
| Apr 2, 3:59 PM CDT | Severe Thunderstorm Warning | SHV | Hempstead, Howard, Nevada, Sevier | 49 min |
| Apr 2, 4:09 PM CDT | Severe Thunderstorm Warning | LZK | Montgomery, Pike, Polk | 51 min |
| Apr 2, 4:30 PM CDT | Severe Thunderstorm Warning | LZK | Desha, Drew, Lincoln | 30 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, 5.7 hours before the alert went out and 131 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
- 1679 J/kg
- Mixed-layer CIN
- -73 J/kg
- Mixed-layer LCL
- 558 m above ground
- 0-6 km bulk shear
- 23 kt
- 0-1 km storm-relative helicity
- -91 m²/s²
- 0-3 km storm-relative helicity
- 4 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.0
SPC that day
Everything else SPC issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Apr 2, 12:15 PM CDT | Mesoscale Discussion | SPC | Ashley, Bradley, Calhoun, Chicot, Clark, Cleveland and 17 more | 90 min |
| Apr 2, 12:50 PM CDT | Severe Thunderstorm Watch | SPC | Ashley, Chicot | 7 hr |
| Apr 2, 3:18 PM CDT | Mesoscale Discussion | SPC | Ashley, Bradley, Calhoun, Clark, Cleveland, Columbia and 28 more | 117 min |
| Apr 2, 3:23 PM CDT | Mesoscale Discussion | SPC | Ashley, Chicot | 2 hr |
| Apr 2, 3:49 PM CDT | Severe Thunderstorm Watch | SPC | Arkansas, Conway, Crawford, Desha, Faulkner, Franklin and 19 more | 4 hr |
| Apr 2, 5:58 PM CDT | Mesoscale Discussion | SPC | Arkansas, Clark, Cleveland, Conway, Dallas, Desha and 23 more | 62 min |
| Apr 2, 9:57 AM CDT | Mesoscale Discussion | SPC | Acadia, Allen, Ascension, Assumption, Avoyelles, Beauregard and 27 more | 63 min |
| Apr 2, 10:10 AM CDT | Severe Thunderstorm Watch | SPC | Acadia, Allen, Ascension, Assumption, Avoyelles, Beauregard and 31 more | 7 hr |
| Apr 2, 5:36 PM CDT | Mesoscale Discussion | SPC | Orleans, Saint Bernard, Saint Tammany | 54 min |
| Apr 2, 3:00 PM CDT | Mesoscale Discussion | SPC | Alfalfa, Beaver, Beckham, Blaine, Caddo, Canadian and 16 more | 2 hr |
| Apr 2, 3:37 PM CDT | Severe Thunderstorm Watch | SPC | Alfalfa, Beaver, Beckham, Blaine, Caddo, Comanche and 16 more | 7 hr |
| Apr 2, 5:16 AM CDT | Mesoscale Discussion | SPC | Austin, Brazoria, Chambers, Colorado, Fayette, Fort Bend and 13 more | 2 hr |
| Apr 2, 6:51 PM CDT | Mesoscale Discussion | SPC | Archer, Baylor, Brown, Callahan, Clay, Coleman and 17 more | 54 min |
Nearby
Severe Thunderstorm Watches in Texas, 2012Severe Thunderstorm Watches in Arkansas, 2012Severe Thunderstorm Watches in Louisiana, 2012Every severe thunderstorm watch in 2012
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.