Alert archive / Texas / Severe Thunderstorm Watches in 2020

Severe Thunderstorm Watch 4

January 10, 202032 counties in Texas

The Storm Prediction Center issued this severe thunderstorm watch at Jan 10, 2020, 3:30 PM CST for 32 counties in Texas. It was in force for 68 days.

The area

The outline as issued.

The facts

Issued: Jan 10, 2020, 3:30 PM CST (21:30 UTC)
Expired: Mar 18, 2020, 9:47 PM CDT
In force: 68 days
Issued by: the Storm Prediction Center
Largest hail expected: 3 in
Strongest gust expected: 60 kt

All 32 counties

Atascosa County, TX, Bandera County, TX, Bastrop County, TX, Bee County, TX, Bexar County, TX, Blanco County, TX, Burnet County, TX, Caldwell County, TX, Comal County, TX, DeWitt County, TX, Dimmit County, TX, Fayette County, TX, Frio County, TX, Gillespie County, TX, Goliad County, TX, Gonzales County, TX, Guadalupe County, TX, Hays County, TX, Karnes County, TX, Kendall County, TX, Kerr County, TX, La Salle County, TX, Lavaca County, TX, Lee County, TX, Live Oak County, TX, Llano County, TX, McMullen County, TX, Medina County, TX, Travis County, TX, Williamson County, TX, Wilson County, TX, Zavala County, TX

The radar

The Austin/San Antonio radar (KEWX), 12 km from the middle of the area, began a volume at 21:28 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: 20%
One or more EF2 to EF5 tornadoes: 5%
Ten or more severe wind reports: 70%
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

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

Issued	Product	Office	Counties	Lasted
Jan 10, 4:00 PM CST	Severe Thunderstorm Warning	EWX	Gillespie, Llano	75 min
Jan 10, 5:07 PM CST	Severe Thunderstorm Warning	EWX	Burnet, Llano	38 min
Jan 10, 5:14 PM CST	Severe Thunderstorm Warning	EWX	Blanco, Gillespie	61 min
Jan 10, 5:18 PM CST	Tornado Warning	EWX	Burnet	27 min
Jan 10, 5:26 PM CST	Severe Thunderstorm Warning	EWX	Kendall, Kerr	49 min
Jan 10, 5:42 PM CST	Severe Thunderstorm Warning	EWX	Bandera, Medina	63 min
Jan 10, 5:54 PM CST	Severe Thunderstorm Warning	EWX	Kendall, Kerr	51 min
Jan 10, 6:46 PM CST	Severe Thunderstorm Warning	EWX	Blanco, Comal, Hays, Kendall	38 min
Jan 10, 6:52 PM CST	Severe Thunderstorm Warning	EWX	Frio, Medina	38 min
Jan 10, 6:52 PM CST	Tornado Warning	EWX	Kendall	23 min
Jan 10, 7:03 PM CST	Severe Thunderstorm Warning	EWX	Blanco, Kendall	42 min
Jan 10, 7:19 PM CST	Severe Thunderstorm Warning	EWX	Atascosa, Bexar, Medina	56 min
Jan 10, 7:49 PM CST	Severe Thunderstorm Warning	EWX	Caldwell, Hays	41 min
Jan 10, 7:53 PM CST	Severe Thunderstorm Warning	EWX	Bexar, Comal, Gonzales, Guadalupe, Hays, Wilson	37 min
Jan 10, 8:03 PM CST	Tornado Warning	EWX	Guadalupe	27 min
Jan 10, 8:26 PM CST	Severe Thunderstorm Warning	EWX	Bastrop, Caldwell, Gonzales, Guadalupe, Hays, Travis and 1 more	49 min
Jan 10, 8:32 PM CST	Tornado Warning	EWX	Caldwell, Gonzales, Guadalupe	28 min
Jan 10, 9:01 PM CST	Severe Thunderstorm Warning	EWX	Bastrop, DeWitt, Fayette, Gonzales, Lavaca, Lee	74 min
Feb 10, 1:41 PM CST	Severe Thunderstorm Warning	EWX	Bandera, Kerr	53 min
Mar 4, 3:13 AM CST	Severe Thunderstorm Warning	EWX	Bandera, Edwards, Kerr, Real, Uvalde	47 min
Mar 4, 3:56 AM CST	Severe Thunderstorm Warning	EWX	Bandera, Gillespie, Kerr, Medina, Real, Uvalde	49 min
Mar 4, 4:43 AM CST	Severe Thunderstorm Warning	EWX	Bandera, Bexar, Blanco, Gillespie, Kendall, Kerr and 1 more	47 min
Mar 4, 5:29 AM CST	Severe Thunderstorm Warning	EWX	Bexar, Blanco, Comal, Hays, Kendall	46 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

Del Rio, TX (KDRT), launched 12:00Z, 9.5 hours before the alert went out and 284 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: 27 J/kg
Mixed-layer CIN: -707 J/kg
Mixed-layer LCL: 986 m above ground
0-6 km bulk shear: 53 kt
0-1 km storm-relative helicity: 384 m²/s²
0-3 km storm-relative helicity: 456 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.0

Open this sounding in Storm Lab

SPC that day

Everything else SPC issued on the same UTC day.

Issued	Product	Office	Counties	Lasted
Jan 10, 11:47 AM CST	Mesoscale Discussion	SPC	Bosque, Collin, Comanche, Cooke, Dallas, Delta and 19 more	118 min
Jan 10, 1:20 PM CST	Tornado Watch	SPC	Anderson, Bell, Bosque, Collin, Cooke, Coryell and 33 more	11 hr
Jan 10, 1:44 PM CST	Mesoscale Discussion	SPC	Delta, Fannin, Grayson, Hopkins, Hunt, Lamar and 1 more	91 min
Jan 10, 2:52 PM CST	Mesoscale Discussion	SPC	Atascosa, Bandera, Bastrop, Bexar, Blanco, Burnet and 17 more	113 min
Jan 10, 2:59 PM CST	Mesoscale Discussion	SPC	Bosque, Collin, Dallas, Delta, Denton, Ellis and 13 more	2 hr
Jan 10, 4:55 PM CST	Mesoscale Discussion	SPC	Anderson, Angelina, Bell, Bosque, Bowie, Camp and 48 more	2 hr
Jan 10, 5:34 PM CST	Tornado Watch	SPC	Angelina, Bowie, Camp, Cass, Cherokee, Franklin and 14 more	11 hr

Nearby

Severe Thunderstorm Watches in Texas, 2020 Every severe thunderstorm 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.