Alert archive / Texas / Tornado Watches in 2019

Tornado Watch 676

October 20, 20198 counties in Arkansas; 5 parishes in Louisiana; 49 counties in Texas

The Storm Prediction Center issued this tornado watch at Oct 20, 2019, 7:01 PM CDT for 8 counties in Arkansas; 5 parishes in Louisiana; 49 counties in Texas. It was in force for 7 hr.

The area

The outline as issued.

The facts

Issued
Oct 20, 2019, 7:01 PM CDT (00:01 UTC)
Expired
Oct 21, 2019, 2:00 AM CDT
In force
7 hr
Issued by
the Storm Prediction Center
Largest hail expected
3 in
Strongest gust expected
70 kt
All 62 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, Bossier Parish, LA, Caddo Parish, LA, Claiborne Parish, LA, De Soto Parish, LA, Webster Parish, LA, Bosque County, TX, Bowie County, TX, Camp County, TX, Cass County, TX, Collin County, TX, Comanche County, TX, Cooke County, TX, Dallas County, TX, Delta County, TX, Denton County, TX, Eastland County, TX, Ellis County, TX, Erath County, TX, Fannin County, TX, Franklin County, TX, Grayson County, TX, Gregg County, TX, Hamilton County, TX, Harrison County, TX, Henderson County, TX, Hill County, TX, Hood County, TX, Hopkins County, TX, Hunt County, TX, Jack County, TX, Johnson County, TX, Kaufman County, TX, Lamar County, TX, Marion County, TX, Montague County, TX, Morris County, TX, Navarro County, TX, Palo Pinto County, TX, Panola County, TX, Parker County, TX, Rains County, TX, Red River County, TX, Rockwall County, TX, Rusk County, TX, Smith County, TX, Somervell County, TX, Stephens County, TX, Tarrant County, TX, Titus County, TX, Upshur County, TX, Van Zandt County, TX, Wise County, TX, Wood County, TX, Young County, TX

The radar

The Dallas/Ft Worth radar (KFWS), 106 km from the middle of the area, began a volume at 00:04 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
40%
Ten or more severe wind reports
60%
One or more gusts of 65 knots or more
50%
Ten or more severe hail reports
70%
One or more hailstones of 2 inches or more
60%
Six or more combined severe hail and wind reports
95%

Warnings issued inside it

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

IssuedProductOfficeCountiesLasted
Oct 20, 7:06 PM CDTSevere Thunderstorm WarningFWDWise54 min
Oct 20, 7:13 PM CDTTornado WarningSHVPanola, Rusk47 min
Oct 20, 7:18 PM CDTSevere Thunderstorm WarningFWDParker, Tarrant42 min
Oct 20, 7:34 PM CDTSevere Thunderstorm WarningFWDHood, Johnson, Parker41 min
Oct 20, 7:36 PM CDTSevere Thunderstorm WarningFWDCooke, Denton54 min
Oct 20, 7:56 PM CDTSevere Thunderstorm WarningSHVHarrison, Panola49 min
Oct 20, 8:01 PM CDTSevere Thunderstorm WarningFWDJohnson, Tarrant44 min
Oct 20, 8:01 PM CDTTornado WarningSHVPanola44 min
Oct 20, 8:08 PM CDTSevere Thunderstorm WarningFWDDallas, Denton, Tarrant52 min
Oct 20, 8:13 PM CDTSevere Thunderstorm WarningFWDGrayson19 min
Oct 20, 8:30 PM CDTTornado WarningSHVCaddo45 min
Oct 20, 8:41 PM CDTSevere Thunderstorm WarningFWDDallas, Ellis, Johnson, Tarrant49 min
Oct 20, 8:56 PM CDTSevere Thunderstorm WarningFWDCollin, Dallas, Denton64 min
Oct 20, 9:00 PM CDTTornado WarningFWDDallas30 min
Oct 20, 9:06 PM CDTTornado WarningSHVBossier, Caddo, Webster31 min
Oct 20, 9:08 PM CDTSevere Thunderstorm WarningSHVCass, Marion54 min
Oct 20, 9:20 PM CDTTornado WarningFWDDallas, Ellis40 min
Oct 20, 9:23 PM CDTTornado Warning Tornado observedConsiderable damage threatFWDCollin, Dallas37 min
Oct 20, 9:30 PM CDTSevere Thunderstorm WarningFWDDallas, Ellis, Kaufman60 min
Oct 20, 9:49 PM CDTSevere Thunderstorm WarningFWDCollin, Hunt, Rockwall56 min
Oct 20, 10:26 PM CDTSevere Thunderstorm WarningFWDKaufman, Van Zandt64 min
Oct 20, 11:01 PM CDTTornado WarningFWDRains, Van Zandt44 min
Oct 20, 11:16 PM CDTSevere Thunderstorm WarningSHVLittle River, Sevier59 min
Oct 20, 11:24 PM CDTSevere Thunderstorm WarningSHVFranklin, Smith, Wood51 min
Oct 20, 11:39 PM CDTSevere Thunderstorm WarningFWDComanche, Erath51 min
Oct 20, 11:41 PM CDTSevere Thunderstorm WarningFWDDenton, Parker, Tarrant, Wise64 min
Oct 20, 11:44 PM CDTSevere Thunderstorm WarningFWDHopkins31 min
Oct 20, 11:59 PM CDTTornado WarningSHVHoward, Sevier27 min
Oct 21, 12:01 AM CDTSevere Thunderstorm WarningSHVBowie, Camp, Franklin, Morris, Titus, Wood44 min
Oct 21, 12:03 AM CDTSevere Thunderstorm WarningSHVHempstead, Howard, Little River, Sevier57 min
Oct 21, 12:03 AM CDTSevere Thunderstorm WarningFWDCollin, Fannin, Grayson57 min
Oct 21, 12:06 AM CDTSevere Thunderstorm WarningFWDCollin, Dallas, Denton, Hunt, Rockwall, Tarrant69 min
Oct 21, 12:21 AM CDTSevere Thunderstorm WarningFWDErath, Hood, Johnson, Parker, Somervell, Tarrant54 min
Oct 21, 12:27 AM CDTTornado WarningFWDCollin21 min
Oct 21, 12:44 AM CDTSevere Thunderstorm WarningFWDTarrant31 min
Oct 21, 12:52 AM CDTSevere Thunderstorm WarningSHVRed River53 min
Oct 21, 12:53 AM CDTSevere Thunderstorm WarningFWDLamar54 min
Oct 21, 1:01 AM CDTSevere Thunderstorm WarningFWDBosque, Hamilton59 min
Oct 21, 1:04 AM CDTSevere Thunderstorm WarningFWDDelta, Hopkins, Hunt, Lamar71 min
Oct 21, 1:14 AM CDTSevere Thunderstorm WarningFWDDallas, Ellis, Hunt, Johnson, Kaufman, Rockwall and 1 more61 min
Oct 21, 1:35 AM CDTSevere Thunderstorm WarningSHVBowie, Franklin, Red River, Titus55 min
Oct 21, 1:45 AM CDTSevere Thunderstorm WarningSHVHoward, Little River, Sevier60 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, 0.0 hours before the alert went out and 97 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 2019-10-21Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 1660 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 2019-10-21The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 216 square meters per square second.1939587897117136Sfc1 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
1660 J/kg
Mixed-layer CIN
-93 J/kg
Mixed-layer LCL
1347 m above ground
0-6 km bulk shear
58 kt
0-1 km storm-relative helicity
216 m²/s²
0-3 km storm-relative helicity
243 m²/s²
Significant tornado parameter
1.2
Supercell composite
14.5

Open this sounding in Storm Lab

SPC that day

Everything else SPC issued on the same UTC day.

IssuedProductOfficeCountiesLasted
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, 1:50 AM CDTTornado WatchSPCColumbia, Hempstead, Howard, Lafayette, Little River, Miller and 3 more5 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.