Alert archive / Mississippi / Tornado Watches in 2020
Tornado Watch 121
The Storm Prediction Center issued this tornado watch at Apr 19, 2020, 11:45 AM CDT for 9 parishes in Louisiana; 39 counties in Mississippi. It was in force for 9 hr.
The area
The outline as issued.
The facts
- Issued
- Apr 19, 2020, 11:45 AM CDT (16:45 UTC)
- Expired
- Apr 19, 2020, 9:00 PM CDT
- In force
- 9 hr
- Issued by
- the Storm Prediction Center
- Largest hail expected
- 2.5 in
- Strongest gust expected
- 60 kt
All 48 counties
Catahoula Parish, LA, Concordia Parish, LA, East Carroll Parish, LA, Franklin Parish, LA, Madison Parish, LA, Morehouse Parish, LA, Richland Parish, LA, Tensas Parish, LA, West Carroll Parish, LA, Adams County, MS, Amite County, MS, Attala County, MS, Claiborne County, MS, Clarke County, MS, Copiah County, MS, Covington County, MS, Forrest County, MS, Franklin County, MS, Hinds County, MS, Holmes County, MS, Humphreys County, MS, Issaquena County, MS, Jasper County, MS, Jefferson County, MS, Jefferson Davis County, MS, Jones County, MS, Kemper County, MS, Lamar County, MS, Lauderdale County, MS, Lawrence County, MS, Leake County, MS, Lincoln County, MS, Madison County, MS, Marion County, MS, Neshoba County, MS, Newton County, MS, Noxubee County, MS, Pike County, MS, Rankin County, MS, Scott County, MS, Sharkey County, MS, Simpson County, MS, Smith County, MS, Walthall County, MS, Warren County, MS, Wilkinson County, MS, Winston County, MS, Yazoo County, MS
The radar
The Jackson/Brandon,MS radar (KDGX), 61 km from the middle of the area, began a volume at 16:44 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
- 90%
- One or more EF2 to EF5 tornadoes
- 70%
- Ten or more severe wind reports
- 80%
- One or more gusts of 65 knots or more
- 10%
- Ten or more severe hail reports
- 80%
- One or more hailstones of 2 inches or more
- 80%
- Six or more combined severe hail and wind reports
- 95%
Warnings issued inside it
29 tornado, severe thunderstorm and flash flood warnings for its counties while it was in force.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Apr 19, 12:53 PM CDT | Severe Thunderstorm Warning | JAN | Copiah, Hinds, Rankin | 43 min |
| Apr 19, 1:52 PM CDT | Severe Thunderstorm Warning | JAN | Franklin, Richland | 68 min |
| Apr 19, 2:00 PM CDT | Severe Thunderstorm Warning | JAN | Newton, Scott, Smith | 60 min |
| Apr 19, 2:08 PM CDT | Severe Thunderstorm Warning | JAN | East Carroll, Madison | 67 min |
| Apr 19, 2:30 PM CDT | Severe Thunderstorm Warning | JAN | Madison, Tensas | 45 min |
| Apr 19, 2:41 PM CDT | Severe Thunderstorm Warning | JAN | Jasper, Simpson, Smith | 49 min |
| Apr 19, 2:46 PM CDT | Severe Thunderstorm Warning | JAN | Hinds, Madison | 59 min |
| Apr 19, 3:01 PM CDT | Flash Flood Warning | JAN | Lowndes, Noxubee, Winston | 3 hr |
| Apr 19, 3:09 PM CDT | Flash Flood Warning | JAN | Warren | 4 hr |
| Apr 19, 3:11 PM CDT | Severe Thunderstorm Warning | JAN | Claiborne, Copiah, Hinds | 43 min |
| Apr 19, 3:26 PM CDT | Severe Thunderstorm Warning | JAN | Madison, Rankin, Scott | 49 min |
| Apr 19, 3:36 PM CDT | Severe Thunderstorm Warning | JAN | Clarke | 39 min |
| Apr 19, 4:00 PM CDT | Severe Thunderstorm Warning | JAN | Jasper, Rankin, Simpson, Smith | 60 min |
| Apr 19, 4:00 PM CDT | Tornado Warning | JAN | Clarke | 30 min |
| Apr 19, 4:39 PM CDT | Severe Thunderstorm Warning | JAN | Clarke, Jasper, Lauderdale, Newton | 66 min |
| Apr 19, 5:11 PM CDT | Severe Thunderstorm Warning | LIX | Wilkinson | 49 min |
| Apr 19, 5:27 PM CDT | Severe Thunderstorm Warning | JAN | Catahoula, Concordia, Franklin, Tensas | 63 min |
| Apr 19, 5:35 PM CDT | Severe Thunderstorm Warning | LIX | Amite | 70 min |
| Apr 19, 5:41 PM CDT | Severe Thunderstorm Warning | LIX | Amite | 49 min |
| Apr 19, 5:44 PM CDT | Severe Thunderstorm Warning | JAN | Franklin | 46 min |
| Apr 19, 6:01 PM CDT | Tornado Warning | LIX | Amite, Pike | 59 min |
| Apr 19, 6:19 PM CDT | Severe Thunderstorm Warning | JAN | Franklin, Lincoln | 41 min |
| Apr 19, 6:39 PM CDT | Tornado Warning | LIX | Pike, Walthall | 38 min |
| Apr 19, 6:55 PM CDT | Tornado Warning | JAN | Lamar, Marion | 65 min |
| Apr 19, 7:24 PM CDT | Severe Thunderstorm Warning | LIX | Wilkinson | 11 min |
| Apr 19, 7:40 PM CDT | Severe Thunderstorm Warning | JAN | Marion | 35 min |
| Apr 19, 7:44 PM CDT | Tornado Warning | JAN | Forrest, Lamar | 31 min |
| Apr 19, 7:45 PM CDT | Severe Thunderstorm Warning | JAN | Forrest, Lamar | 30 min |
| Apr 19, 8:04 PM CDT | Flash Flood Warning | JAN | Forrest, Lamar, Marion | 3 hr |
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, 4.8 hours before the alert went out and 51 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
- 776 J/kg
- Mixed-layer CIN
- -84 J/kg
- Mixed-layer LCL
- 610 m above ground
- 0-6 km bulk shear
- 46 kt
- 0-1 km storm-relative helicity
- 323 m²/s²
- 0-3 km storm-relative helicity
- 329 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 5.7
The text
As transmitted.
847
WWUS20 KWNS 191641
SEL1
SPC WW 191641
LAZ000-MSZ000-200000-
URGENT - IMMEDIATE BROADCAST REQUESTED
Tornado Watch Number 121
NWS Storm Prediction Center Norman OK
1145 AM CDT Sun Apr 19 2020
The NWS Storm Prediction Center has issued a
* Tornado Watch for portions of
Northeast Louisiana
Central and Southern Mississippi
* Effective this Sunday morning and evening from 1145 AM until
700 PM CDT.
* Primary threats include...
Several tornadoes and a couple intense tornadoes likely
Widespread large hail and scattered very large hail events to
2.5 inches in diameter likely
Widespread damaging wind gusts to 70 mph likely
SUMMARY...Clusters of thunderstorms over Louisiana will track
eastward across the watch area this afternoon. The strongest storms
will pose a risk large hail, damaging winds, and tornadoes. An
isolated strong tornado is possible.
The tornado watch area is approximately along and 70 statute miles
north and south of a line from 35 miles south of Monroe LA to 15
miles east northeast of Meridian MS. For a complete depiction of the
watch see the associated watch outline update (WOUS64 KWNS WOU1).
PRECAUTIONARY/PREPAREDNESS ACTIONS...
REMEMBER...A Tornado Watch means conditions are favorable for
tornadoes and severe thunderstorms in and close to the watch
area. Persons in these areas should be on the lookout for
threatening weather conditions and listen for later statements
and possible warnings.
&&
OTHER WATCH INFORMATION...CONTINUE...WW 120...
AVIATION...Tornadoes and a few severe thunderstorms with hail
surface and aloft to 2.5 inches. Extreme turbulence and surface wind
gusts to 60 knots. A few cumulonimbi with maximum tops to 500. Mean
storm motion vector 25035.
...HartSPC that day
Everything else SPC issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Apr 18, 8:27 PM CDT | Mesoscale Discussion | SPC | Bienville, Bossier, Caddo, Claiborne, De Soto, Red River and 1 more | 2 hr |
| Apr 18, 8:56 PM CDT | Mesoscale Discussion | SPC | Acadia, Allen, Ascension, Assumption, Cameron, East Baton Rouge and 26 more | 2 hr |
| Apr 19, 8:41 AM CDT | Tornado Watch | SPC | Allen, Beauregard, Bienville, Bossier, Caddo, Calcasieu and 18 more | 6 hr |
| Apr 19, 10:45 AM CDT | Mesoscale Discussion | SPC | Caldwell, De Soto, Grant, Jackson, LaSalle, Natchitoches and 5 more | 2 hr |
| Apr 19, 11:06 AM CDT | Mesoscale Discussion | SPC | Avoyelles, Catahoula, Concordia, Franklin, Madison, Richland and 1 more | 54 min |
| Apr 19, 12:39 PM CDT | Mesoscale Discussion | SPC | Beauregard, Calcasieu, Vernon | 66 min |
| Apr 19, 12:47 PM CDT | Mesoscale Discussion | SPC | Avoyelles, Bienville, Caldwell, Catahoula, Concordia, De Soto and 14 more | 58 min |
| Apr 19, 2:03 PM CDT | Mesoscale Discussion | SPC | Acadia, Allen, Assumption, Avoyelles, Beauregard, Calcasieu and 23 more | 57 min |
| Apr 19, 2:39 PM CDT | Tornado Watch | SPC | Acadia, Allen, Ascension, Assumption, Avoyelles, Beauregard and 39 more | 9 hr |
| Apr 19, 3:07 PM CDT | Mesoscale Discussion | SPC | Madison, Tensas | 113 min |
| Apr 19, 5:40 PM CDT | Mesoscale Discussion | SPC | Acadia, Allen, Avoyelles, Beauregard, Calcasieu, Catahoula and 18 more | 2 hr |
| Apr 19, 6:37 PM CDT | Mesoscale Discussion | SPC | Washington | 53 min |
| Apr 19, 2:34 AM CDT | Mesoscale Discussion | SPC | Attala, Bolivar, Calhoun, Carroll, Chickasaw, Choctaw and 29 more | 116 min |
| Apr 19, 3:56 PM CDT | Tornado Watch | SPC | George, Greene, Perry, Stone, Wayne | 6 hr |
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.