Alert archive / Arkansas / Severe Thunderstorm Watches in 2012
Severe Thunderstorm Watch 265
The Storm Prediction Center issued this severe thunderstorm watch at May 7, 2012, 5:21 PM CDT for 14 counties in Arkansas; McCurtain County, Oklahoma; Bowie County, Cass County, Texas. It was in force for 5 hr.
The area
The outline as issued.
The facts
- Issued
- May 7, 2012, 5:21 PM CDT (22:21 UTC)
- Expired
- May 7, 2012, 10:00 PM CDT
- In force
- 5 hr
- Issued by
- the Storm Prediction Center
- Largest hail expected
- 2 in
- Strongest gust expected
- 60 kt
Counties Calhoun County, AR, Clark County, AR, Columbia County, AR, Dallas 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, McCurtain County, OK, Bowie County, TX, Cass County, TX
The radar
The Shreveport radar (KSHV), 151 km from the middle of the area, began a volume at 22:22 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
- 2%
- Ten or more severe wind reports
- 30%
- One or more gusts of 65 knots or more
- 20%
- 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
11 tornado, severe thunderstorm and flash flood warnings for its counties while it was in force.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| May 7, 5:30 PM CDT | Severe Thunderstorm Warning | SHV | Hempstead, Howard | 60 min |
| May 7, 5:40 PM CDT | Severe Thunderstorm Warning | LZK | Dallas | 50 min |
| May 7, 5:45 PM CDT | Severe Thunderstorm Warning | SHV | Little River, Sevier | 45 min |
| May 7, 6:22 PM CDT | Severe Thunderstorm Warning | SHV | Hempstead, Lafayette, Little River, Miller, Nevada | 53 min |
| May 7, 6:42 PM CDT | Severe Thunderstorm Warning | SHV | Little River | 63 min |
| May 7, 6:57 PM CDT | Severe Thunderstorm Warning | SHV | Columbia, Lafayette, Miller | 63 min |
| May 7, 7:16 PM CDT | Severe Thunderstorm Warning | LZK | Ouachita | 25 min |
| May 7, 7:42 PM CDT | Severe Thunderstorm Warning | SHV | Bowie, Camp, Morris, Red River, Titus | 33 min |
| May 7, 8:17 PM CDT | Severe Thunderstorm Warning | SHV | Camp, Cass, Morris, Titus, Upshur | 43 min |
| May 7, 8:38 PM CDT | Severe Thunderstorm Warning | LZK | Bradley, Calhoun, Cleveland, Dallas | 42 min |
| May 7, 8:50 PM CDT | Severe Thunderstorm Warning | SHV | Cass, Harrison, Marion, Morris, Upshur | 55 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, 10.4 hours before the alert went out and 148 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
- 746 J/kg
- Mixed-layer CIN
- -132 J/kg
- Mixed-layer LCL
- 1458 m above ground
- 0-6 km bulk shear
- 5 kt
- 0-1 km storm-relative helicity
- -54 m²/s²
- 0-3 km storm-relative helicity
- -19 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 |
|---|---|---|---|---|
| May 7, 4:38 PM CDT | Mesoscale Discussion | SPC | Clark, Columbia, Hempstead, Howard, Lafayette, Little River and 5 more | 67 min |
| May 6, 9:55 PM CDT | Mesoscale Discussion | SPC | Craig, Nowata, Ottawa, Washington | 65 min |
| May 7, 12:46 PM CDT | Severe Thunderstorm Watch | SPC | Brewster, Brown, Callahan, Coke, Coleman, Concho and 23 more | 8 hr |
| May 7, 2:24 PM CDT | Mesoscale Discussion | SPC | Andrews, Crane, Ector, Gaines, Loving, Midland and 3 more | 2 hr |
| May 7, 2:37 PM CDT | Mesoscale Discussion | SPC | Bandera, Blanco, Burnet, Concho, Gillespie, Kendall and 11 more | 83 min |
| May 7, 3:27 PM CDT | Severe Thunderstorm Watch | SPC | Bandera, Bastrop, Bell, Bexar, Blanco, Bosque and 30 more | 7 hr |
| May 7, 3:56 PM CDT | Severe Thunderstorm Watch | SPC | Andrews, Culberson, Ector, Gaines, Jeff Davis, Loving and 4 more | 7 hr |
| May 7, 5:31 PM CDT | Mesoscale Discussion | SPC | Bandera, Bastrop, Bell, Blanco, Burnet, Comal and 28 more | 89 min |
| May 7, 6:55 PM CDT | Mesoscale Discussion | SPC | Andrews, Borden, Crane, Dawson, Ector, Gaines and 11 more | 95 min |
Nearby
Severe Thunderstorm Watches in Arkansas, 2012Severe Thunderstorm Watches in Texas, 2012Severe Thunderstorm Watches in Oklahoma, 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.