Alert archive / Louisiana / Tornado Watches in 2020

Tornado Watch 135

April 22, 202023 parishes in Louisiana; 20 counties in Texas

The Storm Prediction Center issued this tornado watch at Apr 22, 2020, 5:01 PM CDT for 23 parishes in Louisiana; 20 counties in Texas. It was in force for 9 hr.

The area

The outline as issued.

The facts

Issued: Apr 22, 2020, 5:01 PM CDT (22:01 UTC)
Expired: Apr 23, 2020, 2:00 AM CDT
In force: 9 hr
Issued by: the Storm Prediction Center
Largest hail expected: 2.5 in
Strongest gust expected: 65 kt

All 43 counties

Allen Parish, LA, Avoyelles Parish, LA, Beauregard Parish, LA, Bienville Parish, LA, Bossier Parish, LA, Caddo Parish, LA, Caldwell Parish, LA, Claiborne Parish, LA, De Soto Parish, LA, Evangeline Parish, LA, Grant Parish, LA, Jackson Parish, LA, LaSalle Parish, LA, Lincoln Parish, LA, Natchitoches Parish, LA, Ouachita Parish, LA, Rapides Parish, LA, Red River Parish, LA, Sabine Parish, LA, Union Parish, LA, Vernon Parish, LA, Webster Parish, LA, Winn Parish, LA, Angelina County, TX, Cherokee County, TX, Grimes County, TX, Harrison County, TX, Houston County, TX, Jasper County, TX, Madison County, TX, Montgomery County, TX, Nacogdoches County, TX, Newton County, TX, Panola County, TX, Polk County, TX, Rusk County, TX, Sabine County, TX, San Augustine County, TX, San Jacinto County, TX, Shelby County, TX, Trinity County, TX, Tyler County, TX, Walker County, TX

The radar

The Shreveport radar (KSHV), 91 km from the middle of the area, began a volume at 22:05 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: 60%
One or more gusts of 65 knots or more: 30%
Ten or more severe hail reports: 60%
One or more hailstones of 2 inches or more: 50%
Six or more combined severe hail and wind reports: 95%

Warnings issued inside it

36 tornado, severe thunderstorm and flash flood warnings for its counties while it was in force.

Issued	Product	Office	Counties	Lasted
Apr 22, 5:01 PM CDT	Severe Thunderstorm Warning	HGX	Houston, Madison, Polk, San Jacinto, Trinity, Walker	44 min
Apr 22, 5:06 PM CDT	Tornado Warning	HGX	Trinity, Walker	39 min
Apr 22, 5:15 PM CDT	Severe Thunderstorm Warning	SHV	Natchitoches, Sabine	45 min
Apr 22, 5:17 PM CDT	Tornado Warning	HGX	Polk, San Jacinto, Trinity, Walker	43 min
Apr 22, 5:22 PM CDT	Flash Flood Warning	SHV	Bienville, Bossier, Caddo, De Soto, Jackson, Lincoln and 2 more	3 hr
Apr 22, 5:31 PM CDT	Flash Flood Warning	SHV	Bossier, Caddo, De Soto	2 hr
Apr 22, 5:45 PM CDT	Tornado Warning Tornado observedConsiderable damage threat	HGX	Polk, Trinity	45 min
Apr 22, 5:54 PM CDT	Severe Thunderstorm Warning	SHV	Angelina	47 min
Apr 22, 5:59 PM CDT	Tornado Warning	LCH	Tyler	46 min
Apr 22, 6:10 PM CDT	Flash Flood Warning	SHV	Bienville, Bossier, Claiborne, Jackson, Lincoln, Ouachita and 2 more	3 hr
Apr 22, 6:21 PM CDT	Severe Thunderstorm Warning	SHV	Bienville, Bossier, Caddo, Claiborne, De Soto, Webster	39 min
Apr 22, 6:28 PM CDT	Flash Flood Warning	SHV	Caldwell, Grant, Jackson, LaSalle, Natchitoches, Ouachita and 1 more	94 min
Apr 22, 6:43 PM CDT	Tornado Warning	SHV	Bienville, Bossier, Webster	32 min
Apr 22, 6:43 PM CDT	Tornado Warning Tornado observedConsiderable damage threat	LCH	Jasper, Tyler	32 min
Apr 22, 7:08 PM CDT	Tornado Warning EmergencyTornado observedCatastrophic damage threat	LCH	Jasper, Newton	22 min
Apr 22, 7:28 PM CDT	Tornado Warning Considerable damage threat	LCH	Jasper, Newton	32 min
Apr 22, 7:48 PM CDT	Tornado Warning Tornado observedConsiderable damage threat	LCH	Vernon	27 min
Apr 22, 8:15 PM CDT	Tornado Warning EmergencyTornado observedCatastrophic damage threat	LCH	Vernon	20 min
Apr 22, 8:32 PM CDT	Severe Thunderstorm Warning	LCH	Rapides, Vernon	43 min
Apr 22, 9:04 PM CDT	Tornado Warning	LCH	Rapides	26 min
Apr 22, 9:06 PM CDT	Severe Thunderstorm Warning	SHV	De Soto, Sabine	39 min
Apr 22, 9:12 PM CDT	Flash Flood Warning	SHV	Bienville, De Soto, Jackson, Natchitoches, Red River, Sabine and 1 more	109 min
Apr 22, 9:18 PM CDT	Severe Thunderstorm Warning	SHV	Bienville, De Soto, Natchitoches, Red River, Winn	42 min
Apr 22, 9:28 PM CDT	Tornado Warning Tornado observedConsiderable damage threat	LCH	Avoyelles, Rapides	32 min
Apr 22, 9:48 PM CDT	Tornado Warning Tornado observedConsiderable damage threat	LCH	Avoyelles, Rapides	27 min
Apr 22, 9:55 PM CDT	Tornado Warning	SHV	LaSalle	20 min
Apr 22, 9:58 PM CDT	Severe Thunderstorm Warning	SHV	Bienville, Caldwell, Jackson, Natchitoches, Ouachita, Winn	62 min
Apr 22, 10:13 PM CDT	Tornado Warning	SHV	Natchitoches, Winn	32 min
Apr 22, 10:13 PM CDT	Tornado Warning	SHV	Bienville, Caldwell, Jackson, Ouachita, Winn	47 min
Apr 22, 10:16 PM CDT	Flash Flood Warning	SHV	Bienville, Caldwell, De Soto, Jackson, Lincoln, Natchitoches and 5 more	3 hr
Apr 22, 10:38 PM CDT	Severe Thunderstorm Warning	SHV	Caldwell, Jackson, Ouachita, Winn	52 min
Apr 22, 10:38 PM CDT	Tornado Warning	SHV	Natchitoches, Winn	37 min
Apr 22, 11:33 PM CDT	Tornado Warning	SHV	Caldwell, LaSalle	27 min
Apr 23, 12:33 AM CDT	Severe Thunderstorm Warning	LCH	Allen, Calcasieu, Jefferson Davis	57 min
Apr 23, 1:02 AM CDT	Tornado Warning	LCH	Avoyelles, Evangeline, Rapides	43 min
Apr 23, 1:24 AM CDT	Severe Thunderstorm Warning	LCH	Acadia, Allen, Evangeline, Jefferson Davis, Saint Landry	50 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, 10.0 hours before the alert went out and 98 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.

Skew-T log-p

Temperature in red, dew point in green, the mixed-layer parcel dashed.

Hodograph

The wind turning with height, colored by layer: ground to 1 km, 1 to 3 km, 3 to 6 km, 6 to 10 km.

Mixed-layer CAPE: 24 J/kg
Mixed-layer CIN: -457 J/kg
Mixed-layer LCL: 1104 m above ground
0-6 km bulk shear: 56 kt
0-1 km storm-relative helicity: 171 m²/s²
0-3 km storm-relative helicity: 379 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.6

Open this sounding in Storm Lab

SPC that day

Everything else SPC issued on the same UTC day.

Issued	Product	Office	Counties	Lasted
Apr 22, 10:38 AM CDT	Mesoscale Discussion	SPC	Caddo, De Soto, Natchitoches, Red River, Sabine, Vernon	2 hr
Apr 22, 10:55 AM CDT	Tornado Watch	SPC	Allen, Beauregard, De Soto, Evangeline, Grant, Natchitoches and 4 more	6 hr
Apr 22, 1:10 PM CDT	Mesoscale Discussion	SPC	Allen, Beauregard, Calcasieu, De Soto, Evangeline, Grant and 6 more	65 min
Apr 22, 2:53 PM CDT	Mesoscale Discussion	SPC	Bienville, De Soto, Grant, LaSalle, Natchitoches, Rapides and 4 more	67 min
Apr 22, 4:24 PM CDT	Mesoscale Discussion	SPC	Allen, Avoyelles, Beauregard, Bienville, Caldwell, Catahoula and 16 more	96 min
Apr 22, 6:47 PM CDT	Mesoscale Discussion	SPC	Concordia, Saint Helena, Tensas, Washington	88 min
Apr 21, 8:12 PM CDT	Mesoscale Discussion	SPC	Hemphill, Lipscomb, Wheeler	63 min
Apr 22, 1:21 AM CDT	Mesoscale Discussion	SPC	Fannin, Lamar, Red River	84 min
Apr 22, 1:46 AM CDT	Severe Thunderstorm Watch	SPC	Fannin, Lamar, Red River	4 hr
Apr 22, 2:16 AM CDT	Mesoscale Discussion	SPC	Carson, Dallam, Hansford, Hartley, Hemphill, Hutchinson and 7 more	119 min
Apr 22, 1:12 PM CDT	Mesoscale Discussion	SPC	Clay, Collin, Cooke, Dallas, Delta, Denton and 15 more	63 min
Apr 22, 2:33 PM CDT	Tornado Watch	SPC	Collin, Cooke, Dallas, Delta, Denton, Fannin and 12 more	6 hr
Apr 22, 4:43 PM CDT	Mesoscale Discussion	SPC	Grayson	62 min
Apr 22, 4:47 PM CDT	Mesoscale Discussion	SPC	Angelina, Polk, San Augustine, San Jacinto, Trinity, Tyler and 1 more	88 min
Apr 22, 5:38 PM CDT	Mesoscale Discussion	SPC	Camp, Collin, Dallas, Delta, Fannin, Franklin and 10 more	97 min
Apr 22, 5:53 PM CDT	Mesoscale Discussion	SPC	Angelina, Polk, Trinity, Tyler	37 min
Apr 22, 6:39 PM CDT	Mesoscale Discussion	SPC	Bowie, Camp, Cass, Marion, Morris, Red River and 2 more	66 min

Nearby

Tornado Watches in Louisiana, 2020 Tornado Watches in Texas, 2020 Every 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.