Alert archive / Mississippi / Severe Thunderstorm Watches in 2018
Severe Thunderstorm Watch 28
The Storm Prediction Center issued this severe thunderstorm watch at Apr 3, 2018, 4:51 PM CDT for Ashley County, Chicot County, Union County, Arkansas; 21 parishes in Louisiana; 22 counties in Mississippi. It was in force for 5 hr.
The area
The outline as issued.
The facts
- Issued
- Apr 3, 2018, 4:51 PM CDT (21:51 UTC)
- Expired
- Apr 3, 2018, 10:00 PM CDT
- In force
- 5 hr
- Issued by
- the Storm Prediction Center
- Largest hail expected
- 1.5 in
- Strongest gust expected
- 60 kt
All 46 counties
Ashley County, AR, Chicot 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, West Carroll Parish, LA, Winn Parish, LA, Adams County, MS, Bolivar County, MS, Carroll County, MS, Claiborne County, MS, Copiah County, MS, Franklin County, MS, Grenada County, MS, Hinds County, MS, Holmes County, MS, Humphreys County, MS, Issaquena County, MS, Jefferson County, MS, Leflore County, MS, Lincoln County, MS, Madison County, MS, Montgomery County, MS, Rankin County, MS, Sharkey County, MS, Sunflower County, MS, Warren County, MS, Washington County, MS, Yazoo County, MS
The radar
The Jackson/Brandon,MS radar (KDGX), 117 km from the middle of the area, began a volume at 21:51 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
- 60%
- One or more gusts of 65 knots or more
- 20%
- Ten or more severe hail reports
- 60%
- One or more hailstones of 2 inches or more
- 20%
- Six or more combined severe hail and wind reports
- 95%
Warnings issued inside it
24 tornado, severe thunderstorm and flash flood warnings for its counties while it was in force.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Apr 3, 5:00 PM CDT | Severe Thunderstorm Warning | SHV | Caddo, De Soto, Red River, Sabine | 30 min |
| Apr 3, 5:14 PM CDT | Severe Thunderstorm Warning | SHV | Grant, Natchitoches, Sabine, Winn | 46 min |
| Apr 3, 5:16 PM CDT | Severe Thunderstorm Warning | SHV | Union | 59 min |
| Apr 3, 5:30 PM CDT | Severe Thunderstorm Warning | SHV | Bienville, Bossier, Caddo, Caldwell, De Soto, Grant and 7 more | 60 min |
| Apr 3, 5:44 PM CDT | Severe Thunderstorm Warning | JAN | Ashley | 61 min |
| Apr 3, 6:00 PM CDT | Severe Thunderstorm Warning | SHV | Grant, LaSalle, Natchitoches, Sabine, Winn | 60 min |
| Apr 3, 6:01 PM CDT | Severe Thunderstorm Warning | JAN | Morehouse, Richland, West Carroll | 74 min |
| Apr 3, 6:12 PM CDT | Severe Thunderstorm Warning | SHV | Ouachita, Union | 33 min |
| Apr 3, 6:25 PM CDT | Tornado Warning | JAN | Franklin, Richland | 46 min |
| Apr 3, 6:27 PM CDT | Severe Thunderstorm Warning | JAN | Chicot | 78 min |
| Apr 3, 6:30 PM CDT | Severe Thunderstorm Warning | SHV | Caldwell, Grant, Jackson, LaSalle, Natchitoches, Ouachita and 1 more | 45 min |
| Apr 3, 6:38 PM CDT | Severe Thunderstorm Warning | JAN | Bolivar | 52 min |
| Apr 3, 6:43 PM CDT | Severe Thunderstorm Warning | JAN | East Carroll | 77 min |
| Apr 3, 6:49 PM CDT | Severe Thunderstorm Warning | JAN | Catahoula, Franklin, Madison, Tensas | 56 min |
| Apr 3, 7:00 PM CDT | Severe Thunderstorm Warning | SHV | Grant, LaSalle, Natchitoches, Winn | 45 min |
| Apr 3, 7:07 PM CDT | Severe Thunderstorm Warning | JAN | Leflore, Sunflower | 53 min |
| Apr 3, 7:15 PM CDT | Severe Thunderstorm Warning | SHV | Caldwell, Grant, Jackson, LaSalle, Ouachita, Winn | 30 min |
| Apr 3, 7:20 PM CDT | Severe Thunderstorm Warning | JAN | Holmes, Humphreys, Yazoo | 70 min |
| Apr 3, 7:26 PM CDT | Severe Thunderstorm Warning | JAN | East Carroll, Madison | 49 min |
| Apr 3, 7:40 PM CDT | Severe Thunderstorm Warning | JAN | Catahoula, Concordia, Madison, Tensas | 65 min |
| Apr 3, 7:47 PM CDT | Severe Thunderstorm Warning | JAN | Carroll, Grenada, Montgomery | 73 min |
| Apr 3, 7:55 PM CDT | Severe Thunderstorm Warning | JAN | Hinds, Madison, Rankin | 80 min |
| Apr 3, 8:19 PM CDT | Severe Thunderstorm Warning | JAN | Attala, Choctaw, Holmes, Webster | 71 min |
| Apr 3, 9:11 PM CDT | Severe Thunderstorm Warning | JAN | Copiah, Covington, Jasper, Jefferson Davis, Lawrence, Lincoln and 3 more | 79 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, 9.9 hours before the alert went out and 107 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
- 179 J/kg
- Mixed-layer CIN
- -308 J/kg
- Mixed-layer LCL
- 682 m above ground
- 0-6 km bulk shear
- 45 kt
- 0-1 km storm-relative helicity
- 162 m²/s²
- 0-3 km storm-relative helicity
- 149 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.1
SPC that day
Everything else SPC issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Apr 3, 10:26 AM CDT | Severe Thunderstorm Watch | SPC | Columbia, Hempstead, Howard, Lafayette, Little River, Miller and 2 more | 8 hr |
| Apr 3, 12:57 PM CDT | Mesoscale Discussion | SPC | Baxter, Clark, Clay, Cleburne, Conway, Craighead and 39 more | 2 hr |
| Apr 3, 1:33 PM CDT | Tornado Watch | SPC | Arkansas, Baxter, Boone, Bradley, Calhoun, Clark and 51 more | 7 hr |
| Apr 3, 1:55 PM CDT | Mesoscale Discussion | SPC | Little River | 95 min |
| Apr 3, 3:34 PM CDT | Mesoscale Discussion | SPC | Arkansas, Clark, Clay, Cleburne, Cleveland, Conway and 39 more | 86 min |
| Apr 3, 4:33 PM CDT | Mesoscale Discussion | SPC | Ashley, Chicot, Union | 57 min |
| Apr 3, 5:19 PM CDT | Mesoscale Discussion | SPC | Beauregard, Vernon | 86 min |
| Apr 3, 5:51 PM CDT | Severe Thunderstorm Watch | SPC | Acadia, Allen, Avoyelles, Beauregard, Calcasieu, Evangeline and 4 more | 6 hr |
| Apr 3, 6:51 PM CDT | Mesoscale Discussion | SPC | Alcorn, Benton, Calhoun, Carroll, Chickasaw, Clay and 19 more | 114 min |
Nearby
Severe Thunderstorm Watches in Mississippi, 2018Severe Thunderstorm Watches in Louisiana, 2018Severe Thunderstorm Watches in Arkansas, 2018Every severe thunderstorm watch in 2018
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.