Alert archive / Texas / Tornado Watches in 2019

Tornado Watch 680

October 21, 20199 counties in Arkansas; 5 parishes in Louisiana; 41 counties in Texas

The Storm Prediction Center issued this tornado watch at Oct 21, 2019, 1:50 AM CDT for 9 counties in Arkansas; 5 parishes in Louisiana; 41 counties in Texas. It was in force for 5 hr.

The area

The outline as issued.

The facts

Issued
Oct 21, 2019, 1:50 AM CDT (06:50 UTC)
Expired
Oct 21, 2019, 6:31 AM CDT
In force
5 hr
Issued by
the Storm Prediction Center
Largest hail expected
1.5 in
Strongest gust expected
60 kt
All 55 counties

Columbia County, AR, Hempstead County, AR, Howard County, AR, Lafayette County, AR, Little River County, AR, Miller County, AR, Nevada County, AR, Sevier County, AR, Union County, AR, Bossier Parish, LA, Caddo Parish, LA, Claiborne Parish, LA, De Soto Parish, LA, Webster Parish, LA, Anderson County, TX, Bell County, TX, Bosque County, TX, Bowie County, TX, Brazos County, TX, Camp County, TX, Cass County, TX, Cherokee County, TX, Coryell County, TX, Ellis County, TX, Falls County, TX, Franklin County, TX, Freestone County, TX, Gregg County, TX, Harrison County, TX, Henderson County, TX, Hill County, TX, Hopkins County, TX, Houston County, TX, Kaufman County, TX, Lampasas County, TX, Leon County, TX, Limestone County, TX, Madison County, TX, Marion County, TX, McLennan County, TX, Milam County, TX, Morris County, TX, Nacogdoches County, TX, Navarro County, TX, Panola County, TX, Rains County, TX, Red River County, TX, Robertson County, TX, Rusk County, TX, Shelby County, TX, Smith County, TX, Titus County, TX, Upshur County, TX, Van Zandt County, TX, Wood County, TX

The radar

The Shreveport radar (KSHV), 150 km from the middle of the area, began a volume at 06:49 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
40%
One or more EF2 to EF5 tornadoes
20%
Ten or more severe wind reports
30%
One or more gusts of 65 knots or more
10%
Ten or more severe hail reports
10%
One or more hailstones of 2 inches or more
5%
Six or more combined severe hail and wind reports
60%

Warnings issued inside it

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

IssuedProductOfficeCountiesLasted
Oct 21, 2:01 AM CDTSevere Thunderstorm WarningFWDBosque, Hill, Limestone, McLennan59 min
Oct 21, 2:04 AM CDTSevere Thunderstorm WarningFWDEllis, Henderson, Kaufman, Limestone, Navarro56 min
Oct 21, 2:28 AM CDTSevere Thunderstorm WarningSHVBowie, Camp, Cass, Franklin, Morris, Red River and 2 more62 min
Oct 21, 2:29 AM CDTSevere Thunderstorm WarningSHVGregg, Smith, Upshur, Wood61 min
Oct 21, 2:39 AM CDTSevere Thunderstorm WarningSHVHempstead, Howard, Little River, Miller, Nevada, Sevier66 min
Oct 21, 3:11 AM CDTTornado WarningSHVCass34 min
Oct 21, 3:30 AM CDTSevere Thunderstorm WarningSHVColumbia, Lafayette, Miller60 min
Oct 21, 4:24 AM CDTSevere Thunderstorm WarningSHVColumbia, Lafayette, Union66 min
Oct 21, 4:49 AM CDTSevere Thunderstorm WarningSHVCaddo, De Soto41 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 00:00Z, 6.8 hours before the alert went out and 160 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 00:00Z on 2019-10-21Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 1268 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 00:00Z on 2019-10-21The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 110 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
1268 J/kg
Mixed-layer CIN
-12 J/kg
Mixed-layer LCL
1355 m above ground
0-6 km bulk shear
45 kt
0-1 km storm-relative helicity
110 m²/s²
0-3 km storm-relative helicity
184 m²/s²
Significant tornado parameter
0.6
Supercell composite
5.4

Open this sounding in Storm Lab

SPC that day

Everything else SPC issued on the same UTC day.

IssuedProductOfficeCountiesLasted
Oct 20, 7:01 PM CDTTornado WatchSPCColumbia, Hempstead, Howard, Lafayette, Little River, Miller and 2 more7 hr
Oct 20, 8:27 PM CDTTornado WatchSPCBenton, Carroll, Crawford, Franklin, Madison, Sebastian and 1 more5 hr
Oct 20, 10:19 PM CDTMesoscale DiscussionSPCBenton, Washington86 min
Oct 20, 11:32 PM CDTMesoscale DiscussionSPCBaxter, Clark, Cleburne, Cleveland, Conway, Dallas and 27 more88 min
Oct 20, 11:48 PM CDTTornado WatchSPCArkansas, Baxter, Boone, Bradley, Calhoun, Clark and 41 more8 hr
Oct 21, 3:06 AM CDTTornado WatchSPCClay, Craighead, Crittenden, Cross, Greene, Lee and 4 more6 hr
Oct 21, 4:57 AM CDTMesoscale DiscussionSPCAshley, Bradley, Chicot, Desha, Drew63 min
Oct 21, 5:30 AM CDTSevere Thunderstorm WatchSPCAshley, Chicot4 hr
Oct 21, 8:59 AM CDTMesoscale DiscussionSPCAllen, Avoyelles, Concordia, Evangeline, Tensas91 min
Oct 21, 11:47 AM CDTMesoscale DiscussionSPCJefferson, Lafourche, Orleans, Plaquemines, Saint Bernard, Saint Charles and 2 more88 min
Oct 20, 8:36 PM CDTMesoscale DiscussionSPCCollin, Dallas, Hunt, Johnson, Kaufman, Rockwall and 1 more54 min
Oct 20, 9:08 PM CDTMesoscale DiscussionSPCCollin, Dallas, Hunt, Rockwall37 min
Oct 20, 9:55 PM CDTMesoscale DiscussionSPCBrown, Callahan, Coleman, Concho, Kimble, Lampasas and 10 more2 hr
Oct 20, 11:46 PM CDTMesoscale DiscussionSPCBosque, Collin, Comanche, Dallas, Denton, Ellis and 12 more89 min
Oct 21, 12:40 AM CDTMesoscale DiscussionSPCCameron, Willacy35 min

Nearby

Tornado Watches in Texas, 2019Tornado Watches in Arkansas, 2019Tornado Watches in Louisiana, 2019Every tornado watch in 2019

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.