Alert archive / Texas / Severe Thunderstorm Watches in 2018
Severe Thunderstorm Watch 401
The Storm Prediction Center issued this severe thunderstorm watch at Oct 9, 2018, 12:45 AM CDT for 21 counties in Texas. It was in force for 6 hr.
The area
The outline as issued.
The facts
- Issued
- Oct 9, 2018, 12:45 AM CDT (05:45 UTC)
- Expired
- Oct 9, 2018, 7:00 AM CDT
- In force
- 6 hr
- Issued by
- the Storm Prediction Center
- Largest hail expected
- 1.5 in
- Strongest gust expected
- 60 kt
All 21 counties
Brown County, TX, Callahan County, TX, Coke County, TX, Coleman County, TX, Concho County, TX, Crockett County, TX, Fisher County, TX, Haskell County, TX, Irion County, TX, Jones County, TX, McCulloch County, TX, Menard County, TX, Nolan County, TX, Runnels County, TX, Schleicher County, TX, Shackelford County, TX, Sterling County, TX, Sutton County, TX, Taylor County, TX, Throckmorton County, TX, Tom Green County, TX
The radar
The Dyess AFB radar (KDYX), 65 km from the middle of the area, began a volume at 05:47 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
- 40%
- 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
- 70%
Warnings issued inside it
2 tornado, severe thunderstorm and flash flood warnings for its counties while it was in force.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Oct 9, 1:45 AM CDT | Tornado Warning | SJT | Crockett | 30 min |
| Oct 9, 4:20 AM CDT | Flash Flood Warning | SJT | Crockett | 89 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
Midland Regional, TX (KMAF), launched 00:00Z, 5.8 hours before the alert went out and 233 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
- 185 J/kg
- Mixed-layer CIN
- -97 J/kg
- Mixed-layer LCL
- 1544 m above ground
- 0-6 km bulk shear
- 58 kt
- 0-1 km storm-relative helicity
- -62 m²/s²
- 0-3 km storm-relative helicity
- -71 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.1
SPC that day
Everything else SPC issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Oct 8, 8:55 PM CDT | Mesoscale Discussion | SPC | Crockett, Edwards, Irion, Pecos, Reagan, Schleicher and 3 more | 95 min |
| Oct 9, 3:40 AM CDT | Mesoscale Discussion | SPC | Brown, Coleman, Concho, Edwards, Kimble, Kinney and 7 more | 35 min |
| Oct 9, 5:52 AM CDT | Mesoscale Discussion | SPC | Bosque, Coryell, Hamilton, Hood, Johnson, Lampasas and 3 more | 53 min |
| Oct 9, 9:09 AM CDT | Mesoscale Discussion | SPC | Delta, Fannin, Hopkins, Hunt, Lamar, Red River | 2 hr |
| Oct 9, 10:19 AM CDT | Mesoscale Discussion | SPC | Atascosa, Bastrop, Bell, Bexar, Blanco, Bosque and 29 more | 116 min |
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.