Alert archive / Texas / Tornado Watches in 2020

Tornado Watch 105

April 12, 202017 parishes in Louisiana; 25 counties in Texas

The Storm Prediction Center issued this tornado watch at Apr 12, 2020, 5:52 AM CDT for 17 parishes in Louisiana; 25 counties in Texas. It was in force for 8 hr.

The area

The outline as issued.

The facts

Issued
Apr 12, 2020, 5:52 AM CDT (10:52 UTC)
Expired
Apr 12, 2020, 2:00 PM CDT
In force
8 hr
Issued by
the Storm Prediction Center
Largest hail expected
1.5 in
Strongest gust expected
60 kt
All 42 counties

Bienville Parish, LA, Bossier Parish, LA, Caddo Parish, LA, Caldwell Parish, LA, Claiborne Parish, LA, De Soto Parish, LA, Grant Parish, LA, Jackson Parish, LA, LaSalle Parish, LA, Lincoln Parish, LA, Natchitoches Parish, LA, Ouachita Parish, LA, Red River Parish, LA, Sabine Parish, LA, Union Parish, LA, Webster Parish, LA, Winn Parish, LA, Anderson County, TX, Angelina County, TX, Brazos County, TX, Burleson County, TX, Cherokee County, TX, Freestone County, TX, Gregg County, TX, Grimes County, TX, Harrison County, TX, Henderson County, TX, Houston County, TX, Leon County, TX, Limestone County, TX, Madison County, TX, Nacogdoches County, TX, Navarro County, TX, Panola County, TX, Robertson County, TX, Rusk County, TX, Sabine County, TX, San Augustine County, TX, Shelby County, TX, Smith County, TX, Trinity County, TX, Walker County, TX

The radar

The Shreveport radar (KSHV), 138 km from the middle of the area, began a volume at 10:56 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
40%
One or more hailstones of 2 inches or more
10%
Six or more combined severe hail and wind reports
90%

Warnings issued inside it

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

IssuedProductOfficeCountiesLasted
Apr 12, 6:14 AM CDTTornado WarningFWDFreestone34 min
Apr 12, 6:36 AM CDTSevere Thunderstorm WarningFWDHenderson39 min
Apr 12, 6:43 AM CDTSevere Thunderstorm WarningFWDAnderson, Henderson58 min
Apr 12, 7:03 AM CDTSevere Thunderstorm WarningSHVCherokee, Gregg, Rusk, Smith, Upshur57 min
Apr 12, 7:12 AM CDTTornado WarningSHVCherokee, Gregg, Rusk, Smith48 min
Apr 12, 7:16 AM CDTSevere Thunderstorm WarningFWDAnderson, Freestone, Leon45 min
Apr 12, 7:32 AM CDTSevere Thunderstorm WarningSHVCherokee, Rusk, Smith58 min
Apr 12, 7:48 AM CDTFlash Flood WarningSHVCherokee, Gregg, Rusk, Smith3 hr
Apr 12, 7:51 AM CDTTornado WarningSHVGregg, Harrison, Panola, Rusk, Smith, Upshur39 min
Apr 12, 7:56 AM CDTTornado WarningSHVCherokee, Gregg, Rusk, Smith34 min
Apr 12, 8:21 AM CDTSevere Thunderstorm WarningSHVGregg, Harrison, Panola, Rusk, Shelby54 min
Apr 12, 8:28 AM CDTSevere Thunderstorm WarningSHVOuachita17 min
Apr 12, 8:28 AM CDTSevere Thunderstorm WarningSHVGregg, Harrison, Marion, Upshur47 min
Apr 12, 8:31 AM CDTSevere Thunderstorm WarningSHVAngelina, Cherokee, Nacogdoches, Panola, Rusk, San Augustine and 1 more44 min
Apr 12, 8:46 AM CDTFlash Flood Warning Considerable damage threatSHVCass, Gregg, Harrison, Marion, Panola, Rusk2 hr
Apr 12, 9:04 AM CDTTornado WarningSHVPanola, Shelby26 min
Apr 12, 9:12 AM CDTSevere Thunderstorm WarningSHVBossier, Caddo, Webster63 min
Apr 12, 9:15 AM CDTSevere Thunderstorm WarningSHVBienville, Bossier, Caddo, De Soto, Red River, Webster45 min
Apr 12, 9:15 AM CDTTornado WarningSHVCaddo30 min
Apr 12, 9:20 AM CDTSevere Thunderstorm WarningSHVDe Soto, Natchitoches, Red River, Sabine40 min
Apr 12, 9:30 AM CDTTornado WarningSHVDe Soto30 min
Apr 12, 9:41 AM CDTTornado WarningSHVBossier, Caddo28 min
Apr 12, 9:51 AM CDTTornado Warning Tornado observedConsiderable damage threatSHVBienville, Bossier, Caddo, De Soto, Red River, Webster24 min
Apr 12, 9:53 AM CDTTornado WarningSHVBossier, Caddo, De Soto, Red River29 min
Apr 12, 9:58 AM CDTSevere Thunderstorm WarningSHVBienville, Bossier, De Soto, Natchitoches, Red River, Sabine and 1 more62 min
Apr 12, 10:00 AM CDTSevere Thunderstorm WarningSHVBienville, Bossier, Caddo, Claiborne, De Soto, Lincoln and 2 more60 min
Apr 12, 10:04 AM CDTTornado WarningSHVBossier, Claiborne, Webster19 min
Apr 12, 10:07 AM CDTTornado WarningSHVBienville, Natchitoches, Red River23 min
Apr 12, 10:10 AM CDTTornado Warning Tornado observedSHVBienville, Bossier, Red River, Webster39 min
Apr 12, 10:13 AM CDTTornado WarningSHVBienville, Claiborne, Lincoln, Webster47 min
Apr 12, 10:28 AM CDTTornado WarningSHVBienville, Natchitoches47 min
Apr 12, 10:46 AM CDTTornado WarningSHVBienville, Jackson29 min
Apr 12, 10:47 AM CDTSevere Thunderstorm WarningSHVClaiborne, Jackson, Lincoln, Ouachita, Union58 min
Apr 12, 10:56 AM CDTTornado Warning Tornado observedSHVBienville, Claiborne, Lincoln, Union24 min
Apr 12, 11:16 AM CDTTornado WarningSHVLincoln, Ouachita, Union29 min
Apr 12, 11:33 AM CDTTornado Warning EmergencySHVOuachita29 min
Apr 12, 11:42 AM CDTTornado Warning Tornado observedConsiderable damage threatSHVOuachita18 min
Apr 12, 12:16 PM CDTSevere Thunderstorm WarningSHVCaddo, De Soto27 min
Apr 12, 1:55 PM CDTSevere Thunderstorm WarningSHVCaldwell, LaSalle, Ouachita, Winn24 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

Fort Worth, TX (KFWD), launched 00:00Z, 10.9 hours before the alert went out and 237 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, Fort Worth, TX at 00:00Z on 2020-04-12Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 509 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, Fort Worth, TX at 00:00Z on 2020-04-12The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 323 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
509 J/kg
Mixed-layer CIN
-124 J/kg
Mixed-layer LCL
678 m above ground
0-6 km bulk shear
47 kt
0-1 km storm-relative helicity
323 m²/s²
0-3 km storm-relative helicity
406 m²/s²
Significant tornado parameter
0.5
Supercell composite
10.7

Open this sounding in Storm Lab

SPC that day

Everything else SPC issued on the same UTC day.

IssuedProductOfficeCountiesLasted
Apr 12, 7:18 AM CDTMesoscale DiscussionSPCBienville, Bossier, Caddo, Caldwell, Claiborne, De Soto and 13 more87 min
Apr 12, 9:30 AM CDTMesoscale DiscussionSPCBienville, Bossier, Caddo, Caldwell, Claiborne, De Soto and 11 more90 min
Apr 12, 10:24 AM CDTMesoscale DiscussionSPCCatahoula, Concordia, East Carroll, Franklin, Madison, Morehouse and 3 more96 min
Apr 12, 10:41 AM CDTTornado Watch PDSSPCCatahoula, Concordia, East Carroll, Franklin, Madison, Morehouse and 3 more10 hr
Apr 12, 12:03 PM CDTMesoscale DiscussionSPCEast Carroll, Franklin, Madison, Morehouse, Richland, West Carroll87 min
Apr 12, 1:02 PM CDTMesoscale DiscussionSPCAscension, Assumption, East Baton Rouge, East Feliciana, Iberville, Livingston and 12 more118 min
Apr 12, 1:24 PM CDTTornado WatchSPCAcadia, Ascension, Assumption, East Baton Rouge, East Feliciana, Iberia and 16 more9 hr
Apr 12, 5:27 PM CDTMesoscale DiscussionSPCAscension, Assumption, East Baton Rouge, East Feliciana, Iberville, Livingston and 6 more63 min
Apr 12, 5:44 PM CDTMesoscale DiscussionSPCMadison, Tensas91 min
Apr 12, 5:59 PM CDTSevere Thunderstorm WatchSPCBienville, Bossier, Caddo, Caldwell, Claiborne, Jackson and 5 more4 hr
Apr 12, 6:14 PM CDTMesoscale DiscussionSPCBienville, Bossier, Caddo, Claiborne, Lincoln, Red River and 1 more91 min
Apr 11, 7:51 PM CDTMesoscale DiscussionSPCEdwards, Kinney, Real, Sutton, Uvalde, Val Verde84 min
Apr 11, 8:37 PM CDTTornado WatchSPCAtascosa, Bandera, Bastrop, Bexar, Blanco, Caldwell and 23 more5 hr
Apr 11, 9:23 PM CDTMesoscale DiscussionSPCArcher, Baylor, Callahan, Clay, Coke, Coleman and 23 more67 min
Apr 11, 11:03 PM CDTMesoscale DiscussionSPCAtascosa, Bandera, Bexar, Caldwell, Comal, DeWitt and 12 more57 min
Apr 12, 1:37 AM CDTMesoscale DiscussionSPCBandera, Bell, Blanco, Bosque, Brazos, Brown and 44 more113 min
Apr 12, 1:59 AM CDTTornado WatchSPCBandera, Bastrop, Bell, Bexar, Blanco, Bosque and 37 more6 hr
Apr 12, 4:15 AM CDTMesoscale DiscussionSPCBandera, Bastrop, Bell, Blanco, Bosque, Brown and 24 more90 min
Apr 12, 1:10 PM CDTMesoscale DiscussionSPCCamp, Collin, Cooke, Dallas, Delta, Denton and 17 more95 min
Apr 12, 2:51 PM CDTSevere Thunderstorm WatchSPCBowie, Camp, Cass, Delta, Fannin, Franklin and 11 more5 hr

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.