Alert archive / Texas / Tornado Watches in 2020

Tornado Watch 133

April 22, 202010 parishes in Louisiana; 37 counties in Texas

The Storm Prediction Center issued this tornado watch at Apr 22, 2020, 10:55 AM CDT for 10 parishes in Louisiana; 37 counties in Texas. It was in force for 6 hr.

The area

The outline as issued.

The facts

Issued
Apr 22, 2020, 10:55 AM CDT (15:55 UTC)
Expired
Apr 22, 2020, 5:00 PM CDT
In force
6 hr
Issued by
the Storm Prediction Center
Largest hail expected
2 in
Strongest gust expected
60 kt
All 47 counties

Allen Parish, LA, Beauregard Parish, LA, De Soto Parish, LA, Evangeline Parish, LA, Grant Parish, LA, Natchitoches Parish, LA, Rapides Parish, LA, Red River Parish, LA, Sabine Parish, LA, Vernon Parish, LA, Anderson County, TX, Angelina County, TX, Austin County, TX, Bastrop County, TX, Brazos County, TX, Burleson County, TX, Caldwell County, TX, Cherokee County, TX, Falls County, TX, Fayette County, TX, Freestone County, TX, Grimes County, TX, Houston County, TX, Jasper County, TX, Lee County, TX, Leon County, TX, Limestone County, TX, Madison County, TX, Milam County, TX, Montgomery County, TX, Nacogdoches County, TX, Newton County, TX, Panola County, TX, Polk County, TX, Robertson County, TX, Rusk County, TX, Sabine County, TX, San Augustine County, TX, San Jacinto County, TX, Shelby County, TX, Travis County, TX, Trinity County, TX, Tyler County, TX, Walker County, TX, Waller County, TX, Washington County, TX, Williamson County, TX

The radar

The Ft Hood radar (KGRK), 173 km from the middle of the area, began a volume at 15:57 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
60%
One or more EF2 to EF5 tornadoes
30%
Ten or more severe wind reports
60%
One or more gusts of 65 knots or more
20%
Ten or more severe hail reports
80%
One or more hailstones of 2 inches or more
60%
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.

IssuedProductOfficeCountiesLasted
Apr 22, 11:47 AM CDTSevere Thunderstorm WarningFWDAnderson, Freestone26 min
Apr 22, 12:01 PM CDTSevere Thunderstorm WarningSHVBienville, Grant, Jackson, Natchitoches, Red River, Winn29 min
Apr 22, 12:34 PM CDTSevere Thunderstorm WarningSHVGrant, Natchitoches, Sabine, Winn41 min
Apr 22, 1:55 PM CDTSevere Thunderstorm WarningFWDAnderson, Freestone, Leon66 min
Apr 22, 2:14 PM CDTTornado WarningFWDAnderson, Leon46 min
Apr 22, 2:19 PM CDTSevere Thunderstorm WarningHGXHouston26 min
Apr 22, 2:20 PM CDTSevere Thunderstorm WarningLCHVernon25 min
Apr 22, 2:25 PM CDTTornado WarningHGXHouston20 min
Apr 22, 2:30 PM CDTTornado WarningSHVCherokee, Panola, Rusk, Smith45 min
Apr 22, 2:31 PM CDTSevere Thunderstorm WarningSHVSabine44 min
Apr 22, 2:34 PM CDTSevere Thunderstorm WarningSHVGrant, Natchitoches, Sabine41 min
Apr 22, 2:37 PM CDTSevere Thunderstorm WarningSHVCherokee, Nacogdoches, Rusk53 min
Apr 22, 2:45 PM CDTSevere Thunderstorm WarningHGXHouston30 min
Apr 22, 2:48 PM CDTSevere Thunderstorm WarningLCHRapides, Vernon42 min
Apr 22, 3:04 PM CDTTornado WarningSHVAngelina, Cherokee, Nacogdoches41 min
Apr 22, 3:05 PM CDTTornado WarningHGXHouston10 min
Apr 22, 3:13 PM CDTSevere Thunderstorm WarningSHVNatchitoches, Sabine62 min
Apr 22, 3:18 PM CDTSevere Thunderstorm WarningHGXBrazos, Burleson, Grimes, Madison42 min
Apr 22, 3:28 PM CDTFlash Flood Warning Considerable damage threatSHVAngelina, Cherokee, Nacogdoches3 hr
Apr 22, 3:43 PM CDTSevere Thunderstorm WarningFWDLeon34 min
Apr 22, 3:43 PM CDTTornado WarningSHVAngelina, Nacogdoches, San Augustine, Shelby47 min
Apr 22, 3:55 PM CDTSevere Thunderstorm WarningSHVGrant, LaSalle, Natchitoches, Winn50 min
Apr 22, 3:58 PM CDTSevere Thunderstorm WarningLCHRapides32 min
Apr 22, 3:58 PM CDTSevere Thunderstorm WarningHGXBrazos, Grimes, Madison, Walker47 min
Apr 22, 4:27 PM CDTSevere Thunderstorm WarningSHVSabine48 min
Apr 22, 4:33 PM CDTSevere Thunderstorm WarningHGXTrinity, Walker11 min
Apr 22, 4:37 PM CDTTornado WarningHGXGrimes, Houston, Madison, Walker23 min
Apr 22, 4:43 PM CDTFlash Flood WarningSHVDe Soto3 hr
Apr 22, 4:45 PM CDTFlash Flood WarningSHVDe Soto, Sabine3 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

Shreveport, LA (KSHV), launched 12:00Z, 3.9 hours before the alert went out and 231 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-pSkew-T log-p diagram, Shreveport, LA at 12:00Z on 2020-04-22Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 24 joules per kilogram.LCLLFCEL10008507005003002001001 km2 km3 km6 km9 km12 km15 km-30°-20°-10°0°10°20°30°40°
Temperature in red, dew point in green, the mixed-layer parcel dashed.
HodographHodograph, Shreveport, LA at 12:00Z on 2020-04-22The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 171 square meters per square second.1939587897117Sfc1 km3 km6 km9 kmRMLM
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.

IssuedProductOfficeCountiesLasted
Apr 22, 10:38 AM CDTMesoscale DiscussionSPCCaddo, De Soto, Natchitoches, Red River, Sabine, Vernon2 hr
Apr 22, 1:10 PM CDTMesoscale DiscussionSPCAllen, Beauregard, Calcasieu, De Soto, Evangeline, Grant and 6 more65 min
Apr 22, 2:53 PM CDTMesoscale DiscussionSPCBienville, De Soto, Grant, LaSalle, Natchitoches, Rapides and 4 more67 min
Apr 22, 4:24 PM CDTMesoscale DiscussionSPCAllen, Avoyelles, Beauregard, Bienville, Caldwell, Catahoula and 16 more96 min
Apr 22, 5:01 PM CDTTornado WatchSPCAllen, Avoyelles, Beauregard, Bienville, Bossier, Caddo and 17 more9 hr
Apr 22, 6:47 PM CDTMesoscale DiscussionSPCConcordia, Saint Helena, Tensas, Washington88 min
Apr 21, 8:12 PM CDTMesoscale DiscussionSPCHemphill, Lipscomb, Wheeler63 min
Apr 22, 1:21 AM CDTMesoscale DiscussionSPCFannin, Lamar, Red River84 min
Apr 22, 1:46 AM CDTSevere Thunderstorm WatchSPCFannin, Lamar, Red River4 hr
Apr 22, 2:16 AM CDTMesoscale DiscussionSPCCarson, Dallam, Hansford, Hartley, Hemphill, Hutchinson and 7 more119 min
Apr 22, 1:12 PM CDTMesoscale DiscussionSPCClay, Collin, Cooke, Dallas, Delta, Denton and 15 more63 min
Apr 22, 2:33 PM CDTTornado WatchSPCCollin, Cooke, Dallas, Delta, Denton, Fannin and 12 more6 hr
Apr 22, 4:43 PM CDTMesoscale DiscussionSPCGrayson62 min
Apr 22, 4:47 PM CDTMesoscale DiscussionSPCAngelina, Polk, San Augustine, San Jacinto, Trinity, Tyler and 1 more88 min
Apr 22, 5:38 PM CDTMesoscale DiscussionSPCCamp, Collin, Dallas, Delta, Fannin, Franklin and 10 more97 min
Apr 22, 5:53 PM CDTMesoscale DiscussionSPCAngelina, Polk, Trinity, Tyler37 min
Apr 22, 6:39 PM CDTMesoscale DiscussionSPCBowie, Camp, Cass, Marion, Morris, Red River and 2 more66 min

Nearby

Tornado Watches in Texas, 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.