Alert archive / Mississippi / Severe Thunderstorm Watches in 2012
Severe Thunderstorm Watch 134
The Storm Prediction Center issued this severe thunderstorm watch at Apr 3, 2012, 2:22 PM CDT for 5 counties in Arkansas; 22 parishes in Louisiana; 23 counties in Mississippi. It was in force for 8 hr.
The area
The outline as issued.
The facts
- Issued
- Apr 3, 2012, 2:22 PM CDT (19:22 UTC)
- Expired
- Apr 3, 2012, 10:00 PM CDT
- In force
- 8 hr
- Issued by
- the Storm Prediction Center
- Largest hail expected
- 1 in
- Strongest gust expected
- 60 kt
All 50 counties
Columbia County, AR, Hempstead County, AR, Lafayette County, AR, Nevada County, AR, Union County, AR, Bienville Parish, LA, Caldwell Parish, LA, Catahoula Parish, LA, Claiborne Parish, LA, Concordia Parish, LA, East Carroll Parish, LA, Franklin Parish, LA, Grant Parish, LA, Jackson Parish, LA, LaSalle Parish, LA, Lincoln Parish, LA, Madison Parish, LA, Morehouse Parish, LA, Natchitoches Parish, LA, Ouachita Parish, LA, Red River Parish, LA, Richland Parish, LA, Tensas Parish, LA, Union Parish, LA, Webster Parish, LA, West Carroll Parish, LA, Winn Parish, LA, Adams County, MS, Attala County, MS, Claiborne County, MS, Copiah County, MS, Covington County, MS, Franklin County, MS, Hinds County, MS, Holmes County, MS, Humphreys County, MS, Issaquena County, MS, Jefferson County, MS, Jefferson Davis County, MS, Lawrence County, MS, Leake County, MS, Lincoln County, MS, Madison County, MS, Rankin County, MS, Scott County, MS, Sharkey County, MS, Simpson County, MS, Smith County, MS, Warren County, MS, Yazoo County, MS
The radar
The Jackson/Brandon,MS radar (KDGX), 114 km from the middle of the area, began a volume at 19:23 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
- 20%
- 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
- 70%
Warnings issued inside it
20 tornado, severe thunderstorm and flash flood warnings for its counties while it was in force.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Apr 3, 3:08 PM CDT | Severe Thunderstorm Warning | JAN | East Carroll, West Carroll | 15 min |
| Apr 3, 3:12 PM CDT | Severe Thunderstorm Warning | SHV | Union | 63 min |
| Apr 3, 3:25 PM CDT | Flash Flood Warning | SHV | Union | 3 hr |
| Apr 3, 3:50 PM CDT | Severe Thunderstorm Warning | JAN | East Carroll | 40 min |
| Apr 3, 4:59 PM CDT | Severe Thunderstorm Warning | SHV | Ouachita, Union | 41 min |
| Apr 3, 6:17 PM CDT | Severe Thunderstorm Warning | SHV | Columbia, Lafayette, Miller | 58 min |
| Apr 3, 6:35 PM CDT | Severe Thunderstorm Warning | JAN | Claiborne, Copiah | 18 min |
| Apr 3, 6:46 PM CDT | Severe Thunderstorm Warning | JAN | Copiah, Jefferson, Lincoln | 34 min |
| Apr 3, 6:53 PM CDT | Tornado Warning | SHV | Lafayette, Miller | 67 min |
| Apr 3, 6:56 PM CDT | Severe Thunderstorm Warning | SHV | Columbia, Union | 52 min |
| Apr 3, 7:12 PM CDT | Severe Thunderstorm Warning | SHV | Columbia, Lafayette, Nevada | 63 min |
| Apr 3, 7:25 PM CDT | Severe Thunderstorm Warning | SHV | Columbia | 65 min |
| Apr 3, 7:33 PM CDT | Severe Thunderstorm Warning | SHV | Columbia, Hempstead, Lafayette, Miller, Nevada | 57 min |
| Apr 3, 7:37 PM CDT | Severe Thunderstorm Warning | SHV | Claiborne | 38 min |
| Apr 3, 8:12 PM CDT | Severe Thunderstorm Warning | SHV | Bienville, Bossier, Caddo, Claiborne, De Soto, Webster | 63 min |
| Apr 3, 8:16 PM CDT | Severe Thunderstorm Warning | JAN | Franklin, Lincoln | 44 min |
| Apr 3, 8:22 PM CDT | Severe Thunderstorm Warning | JAN | Jefferson Davis, Lawrence, Lincoln, Simpson | 53 min |
| Apr 3, 8:33 PM CDT | Severe Thunderstorm Warning | SHV | Columbia, Union | 57 min |
| Apr 3, 9:12 PM CDT | Severe Thunderstorm Warning | SHV | Bienville, Bossier, Caddo, Claiborne, De Soto, Jackson and 5 more | 63 min |
| Apr 3, 9:28 PM CDT | Severe Thunderstorm Warning | SHV | Union | 62 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
Jackson, MS (KJAN), launched 12:00Z, 7.4 hours before the alert went out and 104 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
- 159 J/kg
- Mixed-layer CIN
- -252 J/kg
- Mixed-layer LCL
- 1092 m above ground
- 0-6 km bulk shear
- 15 kt
- 0-1 km storm-relative helicity
- 24 m²/s²
- 0-3 km storm-relative helicity
- -33 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 3, 1:42 PM CDT | Mesoscale Discussion | SPC | Chicot | 93 min |
| Apr 3, 2:36 PM CDT | Tornado Watch | SPC | Howard, Little River, Miller, Sevier | 7 hr |
| Apr 3, 3:05 PM CDT | Mesoscale Discussion | SPC | Hempstead, Howard, Little River, Montgomery, Nevada, Pike and 2 more | 85 min |
| Apr 3, 3:43 PM CDT | Severe Thunderstorm Watch | SPC | Boone, Bradley, Calhoun, Clark, Crawford, Dallas and 16 more | 6 hr |
| Apr 3, 5:00 PM CDT | Mesoscale Discussion | SPC | Little River, Miller | 60 min |
| Apr 3, 5:24 PM CDT | Mesoscale Discussion | SPC | Ashley, Chicot, Union | 66 min |
| Apr 3, 6:53 PM CDT | Mesoscale Discussion | SPC | Columbia, Hempstead, Lafayette, Little River, Miller, Nevada and 1 more | 67 min |
| Apr 2, 10:10 PM CDT | Mesoscale Discussion | SPC | Iberia, St. Mary | 3 hr |
| Apr 3, 1:46 PM CDT | Mesoscale Discussion | SPC | Caddo, De Soto | 89 min |
Nearby
Severe Thunderstorm Watches in Mississippi, 2012Severe Thunderstorm Watches in Louisiana, 2012Severe Thunderstorm Watches in Arkansas, 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.