Alert archive / Texas / Severe Thunderstorm Watches in 2018
Severe Thunderstorm Watch 441
The Storm Prediction Center issued this severe thunderstorm watch at Dec 26, 2018, 12:44 PM CST for 46 counties in Texas. It was in force for 6 hr.
The area
The outline as issued.
The facts
- Issued
- Dec 26, 2018, 12:44 PM CST (18:44 UTC)
- Expired
- Dec 26, 2018, 6:41 PM CST
- In force
- 6 hr
- Issued by
- the Storm Prediction Center
- Largest hail expected
- 1 in
- Strongest gust expected
- 60 kt
All 46 counties
Armstrong County, TX, Borden County, TX, Briscoe County, TX, Carson County, TX, Castro County, TX, Childress County, TX, Coke County, TX, Collingsworth County, TX, Cottle County, TX, Crockett County, TX, Crosby County, TX, Dawson County, TX, Dickens County, TX, Donley County, TX, Fisher County, TX, Floyd County, TX, Garza County, TX, Glasscock County, TX, Gray County, TX, Hale County, TX, Hall County, TX, Hockley County, TX, Howard County, TX, Irion County, TX, Kent County, TX, King County, TX, Lamb County, TX, Lubbock County, TX, Lynn County, TX, Martin County, TX, Midland County, TX, Mitchell County, TX, Motley County, TX, Nolan County, TX, Potter County, TX, Randall County, TX, Reagan County, TX, Schleicher County, TX, Scurry County, TX, Sterling County, TX, Stonewall County, TX, Sutton County, TX, Swisher County, TX, Terry County, TX, Tom Green County, TX, Upton County, TX
The radar
The Lubbock radar (KLBB), 73 km from the middle of the area, began a volume at 18:44 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
- 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
- 20%
- Six or more combined severe hail and wind reports
- 90%
Warnings issued inside it
7 tornado, severe thunderstorm and flash flood warnings for its counties while it was in force.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Dec 26, 2:31 PM CST | Severe Thunderstorm Warning | AMA | Oldham, Potter | 59 min |
| Dec 26, 2:33 PM CST | Severe Thunderstorm Warning | MAF | Borden, Glasscock, Howard, Mitchell, Reagan, Scurry | 57 min |
| Dec 26, 2:41 PM CST | Severe Thunderstorm Warning | SJT | Crockett | 64 min |
| Dec 26, 2:59 PM CST | Severe Thunderstorm Warning | AMA | Potter, Randall | 33 min |
| Dec 26, 3:39 PM CST | Severe Thunderstorm Warning | LUB | Motley | 51 min |
| Dec 26, 4:13 PM CST | Severe Thunderstorm Warning | LUB | Childress, Cottle, Hall, Motley | 47 min |
| Dec 26, 4:20 PM CST | Tornado Warning | AMA | Collingsworth, Donley | 25 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
Amarillo Airport, TX (KAMA), launched 12:00Z, 6.7 hours before the alert went out and 199 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.
- Mixed-layer CAPE
- 329 J/kg
- Mixed-layer CIN
- -15 J/kg
- Mixed-layer LCL
- 510 m above ground
- 0-6 km bulk shear
- 52 kt
- 0-1 km storm-relative helicity
- 198 m²/s²
- 0-3 km storm-relative helicity
- 203 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.0
SPC that day
Everything else SPC issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Dec 26, 11:33 AM CST | Mesoscale Discussion | SPC | Bailey, Borden, Briscoe, Castro, Coke, Crockett and 24 more | 117 min |
| Dec 26, 12:28 PM CST | Mesoscale Discussion | SPC | Archer, Baylor, Brown, Callahan, Coleman, Comanche and 22 more | 2 hr |
| Dec 26, 2:11 PM CST | Tornado Watch | SPC | Bell, Bosque, Brown, Burnet, Callahan, Coleman and 29 more | 10 hr |
| Dec 26, 3:21 PM CST | Mesoscale Discussion | SPC | Armstrong, Borden, Briscoe, Castro, Childress, Coke and 34 more | 84 min |
| Dec 26, 4:43 PM CST | Mesoscale Discussion | SPC | Archer, Baylor, Bell, Blanco, Bosque, Brown and 42 more | 2 hr |
| Dec 26, 4:58 PM CST | Mesoscale Discussion | SPC | Archer, Baylor, Bell, Blanco, Bosque, Brown and 42 more | 62 min |
| Dec 26, 5:06 PM CST | Severe Thunderstorm Watch | SPC | Archer, Baylor, Clay, Foard, Hardeman, Knox and 2 more | 4 hr |
| Dec 26, 5:48 PM CST | Tornado Watch | SPC | Atascosa, Bandera, Bastrop, Bexar, Blanco, Caldwell and 17 more | 8 hr |
Nearby
Severe Thunderstorm Watches in Texas, 2018Every severe thunderstorm watch in 2018
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.