Alert archive / Mississippi / Tornado Watches in 2020
Tornado Watch 137
The Storm Prediction Center issued this tornado watch at Apr 22, 2020, 9:47 PM CDT for 18 parishes in Louisiana; 26 counties in Mississippi. It was in force for 9 hr.
The area
The outline as issued.
The facts
- Issued
- Apr 22, 2020, 9:47 PM CDT (02:47 UTC)
- Expired
- Apr 23, 2020, 7:00 AM CDT
- In force
- 9 hr
- Issued by
- the Storm Prediction Center
- Largest hail expected
- 2 in
- Strongest gust expected
- 65 kt
All 44 counties
Ascension Parish, LA, Catahoula Parish, LA, Concordia Parish, LA, East Baton Rouge Parish, LA, East Feliciana Parish, LA, Franklin Parish, LA, Iberville Parish, LA, Livingston Parish, LA, Madison Parish, LA, Pointe Coupee Parish, LA, Richland Parish, LA, Saint Helena Parish, LA, Saint Tammany Parish, LA, Tangipahoa Parish, LA, Tensas Parish, LA, Washington Parish, LA, West Baton Rouge Parish, LA, West Feliciana Parish, LA, Adams County, MS, Amite County, MS, Claiborne County, MS, Clarke County, MS, Copiah County, MS, Covington County, MS, Forrest County, MS, Franklin County, MS, Hancock County, MS, Hinds County, MS, Jasper County, MS, Jefferson County, MS, Jefferson Davis County, MS, Jones County, MS, Lamar County, MS, Lawrence County, MS, Lincoln County, MS, Marion County, MS, Pearl River County, MS, Pike County, MS, Rankin County, MS, Simpson County, MS, Smith County, MS, Walthall County, MS, Warren County, MS, Wilkinson County, MS
The radar
The Jackson/Brandon,MS radar (KDGX), 106 km from the middle of the area, began a volume at 02:51 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
- 70%
- One or more EF2 to EF5 tornadoes
- 50%
- Ten or more severe wind reports
- 70%
- One or more gusts of 65 knots or more
- 30%
- Ten or more severe hail reports
- 40%
- One or more hailstones of 2 inches or more
- 30%
- Six or more combined severe hail and wind reports
- 90%
Warnings issued inside it
40 tornado, severe thunderstorm and flash flood warnings for its counties while it was in force.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Apr 22, 9:53 PM CDT | Tornado Warning | JAN | Catahoula, Concordia | 67 min |
| Apr 22, 9:58 PM CDT | Severe Thunderstorm Warning | JAN | Claiborne, Copiah, Jefferson, Lincoln | 47 min |
| Apr 22, 10:21 PM CDT | Severe Thunderstorm Warning | JAN | Covington, Jefferson Davis, Lawrence, Simpson | 54 min |
| Apr 22, 10:29 PM CDT | Tornado Warning | JAN | Concordia | 32 min |
| Apr 22, 11:06 PM CDT | Severe Thunderstorm Warning | JAN | Franklin, Richland | 54 min |
| Apr 22, 11:12 PM CDT | Severe Thunderstorm Warning | JAN | Covington, Jones | 51 min |
| Apr 22, 11:49 PM CDT | Severe Thunderstorm Warning | JAN | Catahoula, Franklin, Tensas | 56 min |
| Apr 22, 11:52 PM CDT | Severe Thunderstorm Warning | JAN | Franklin, Madison | 53 min |
| Apr 23, 12:33 AM CDT | Severe Thunderstorm Warning | JAN | Tensas | 42 min |
| Apr 23, 12:35 AM CDT | Severe Thunderstorm Warning | JAN | Madison | 55 min |
| Apr 23, 12:38 AM CDT | Flash Flood Warning | JAN | Warren | 3 hr |
| Apr 23, 12:43 AM CDT | Severe Thunderstorm Warning | JAN | Rankin, Simpson, Smith | 51 min |
| Apr 23, 1:16 AM CDT | Flash Flood Warning | JAN | Hinds, Madison, Rankin | 3 hr |
| Apr 23, 1:18 AM CDT | Flash Flood Warning | JAN | Franklin, Tensas | 3 hr |
| Apr 23, 1:25 AM CDT | Severe Thunderstorm Warning | JAN | Clarke, Jasper, Lauderdale, Newton | 36 min |
| Apr 23, 1:32 AM CDT | Flash Flood Warning | JAN | Catahoula, Concordia | 3 hr |
| Apr 23, 1:33 AM CDT | Severe Thunderstorm Warning | JAN | Copiah, Hinds, Rankin, Simpson, Smith | 57 min |
| Apr 23, 2:01 AM CDT | Severe Thunderstorm Warning | LIX | Wilkinson | 59 min |
| Apr 23, 2:02 AM CDT | Tornado Warning | JAN | Rankin | 28 min |
| Apr 23, 2:06 AM CDT | Tornado Warning | LIX | Wilkinson | 39 min |
| Apr 23, 2:12 AM CDT | Severe Thunderstorm Warning | JAN | Claiborne, Jefferson | 31 min |
| Apr 23, 2:16 AM CDT | Flash Flood Warning | JAN | Rankin, Scott, Smith | 3 hr |
| Apr 23, 2:21 AM CDT | Flash Flood Warning | JAN | Claiborne, Copiah, Jefferson, Simpson | 3 hr |
| Apr 23, 2:21 AM CDT | Severe Thunderstorm Warning | JAN | Jasper, Newton, Rankin, Scott, Smith | 54 min |
| Apr 23, 2:40 AM CDT | Severe Thunderstorm Warning | LIX | Iberville, Pointe Coupee, West Baton Rouge, West Feliciana | 65 min |
| Apr 23, 2:44 AM CDT | Severe Thunderstorm Warning | LIX | Amite, Pike | 61 min |
| Apr 23, 2:45 AM CDT | Tornado Warning | LIX | Iberville, Pointe Coupee, West Baton Rouge | 45 min |
| Apr 23, 3:03 AM CDT | Severe Thunderstorm Warning | LIX | East Baton Rouge, East Feliciana, Livingston, Saint Helena | 57 min |
| Apr 23, 3:04 AM CDT | Tornado Warning | LIX | Amite, Pike | 25 min |
| Apr 23, 3:09 AM CDT | Severe Thunderstorm Warning | JAN | Clarke, Jasper, Lauderdale, Newton | 40 min |
| Apr 23, 3:13 AM CDT | Tornado Warning | LIX | Pike, Walthall | 47 min |
| Apr 23, 3:28 AM CDT | Flash Flood Warning | JAN | Clarke, Jasper, Lauderdale, Newton, Simpson, Smith | 3 hr |
| Apr 23, 3:45 AM CDT | Severe Thunderstorm Warning | JAN | Covington, Jefferson Davis, Lamar, Lawrence, Marion | 48 min |
| Apr 23, 3:49 AM CDT | Severe Thunderstorm Warning | LIX | Livingston, Saint Tammany, Tangipahoa, Washington | 56 min |
| Apr 23, 3:57 AM CDT | Tornado Warning | JAN | Covington, Jefferson Davis, Lamar, Marion | 31 min |
| Apr 23, 4:02 AM CDT | Severe Thunderstorm Warning | JAN | Covington, Jasper, Jones, Smith | 43 min |
| Apr 23, 4:04 AM CDT | Flash Flood Warning | JAN | Hinds, Madison, Rankin | 4 hr |
| Apr 23, 4:21 AM CDT | Tornado Warning | JAN | Clarke, Jasper, Jones | 39 min |
| Apr 23, 4:50 AM CDT | Severe Thunderstorm Warning | LIX | Saint Tammany, Washington | 25 min |
| Apr 23, 5:10 AM CDT | Severe Thunderstorm Warning | LIX | Hancock, Pearl River | 35 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
Slidell Radar S, LA (KSIL), launched 00:00Z, 2.8 hours before the alert went out and 191 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
- 8 J/kg
- Mixed-layer CIN
- -206 J/kg
- Mixed-layer LCL
- 885 m above ground
- 0-6 km bulk shear
- 66 kt
- 0-1 km storm-relative helicity
- 337 m²/s²
- 0-3 km storm-relative helicity
- 666 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 22, 7:01 PM CDT | Mesoscale Discussion | SPC | Beauregard, Vernon | 89 min |
| Apr 22, 7:41 PM CDT | Mesoscale Discussion | SPC | Vernon | 34 min |
| Apr 22, 8:26 PM CDT | Mesoscale Discussion | SPC | De Soto, Natchitoches, Sabine | 94 min |
| Apr 22, 9:31 PM CDT | Mesoscale Discussion | SPC | Avoyelles, Concordia, East Feliciana, Pointe Coupee, Saint Helena, Washington and 1 more | 89 min |
| Apr 22, 10:17 PM CDT | Mesoscale Discussion | SPC | Caldwell, Grant, LaSalle, Natchitoches, Sabine, Winn | 88 min |
| Apr 22, 11:16 PM CDT | Mesoscale Discussion | SPC | Acadia, Allen, Avoyelles, Beauregard, Calcasieu, Caldwell and 15 more | 89 min |
| Apr 23, 12:02 AM CDT | Tornado Watch | SPC | Acadia, Allen, Avoyelles, Beauregard, Calcasieu, Evangeline and 5 more | 4 hr |
| Apr 23, 2:28 AM CDT | Mesoscale Discussion | SPC | Acadia, Ascension, Avoyelles, Concordia, East Baton Rouge, East Feliciana and 17 more | 92 min |
| Apr 23, 1:37 PM CDT | Mesoscale Discussion | SPC | Ascension, East Baton Rouge, East Feliciana, Iberville, Livingston, Saint Helena and 3 more | 113 min |
| Apr 23, 4:05 AM CDT | Tornado Watch | SPC | George, Greene, Hancock, Harrison, Jackson, Pearl River and 3 more | 11 hr |
| Apr 23, 7:43 AM CDT | Mesoscale Discussion | SPC | George, Greene, Harrison, Jackson, Stone | 92 min |
| Apr 23, 4:06 PM CDT | Severe Thunderstorm Watch | SPC | Wayne | 113 min |
Nearby
Tornado Watches in Mississippi, 2020Tornado Watches in Louisiana, 2020Every tornado watch in 2020
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.