Alert archive / Texas / Severe Thunderstorm Watches in 2018
Severe Thunderstorm Watch 400
The Storm Prediction Center issued this severe thunderstorm watch at Oct 8, 2018, 5:48 PM CDT for 26 counties in Texas. It was in force for 7 hr.
The area
The outline as issued.
The facts
- Issued
- Oct 8, 2018, 5:48 PM CDT (22:48 UTC)
- Expired
- Oct 9, 2018, 1:00 AM CDT
- In force
- 7 hr
- Issued by
- the Storm Prediction Center
- Largest hail expected
- 1.5 in
- Strongest gust expected
- 60 kt
All 26 counties
Coke County, TX, Crane County, TX, Crockett County, TX, Ector County, TX, Edwards County, TX, Fisher County, TX, Glasscock County, TX, Howard County, TX, Irion County, TX, Jones County, TX, Kinney County, TX, Martin County, TX, Midland County, TX, Mitchell County, TX, Nolan County, TX, Pecos County, TX, Reagan County, TX, Runnels County, TX, Schleicher County, TX, Sterling County, TX, Sutton County, TX, Taylor County, TX, Terrell County, TX, Tom Green County, TX, Upton County, TX, Val Verde County, TX
The radar
The San Angelo radar (KSJT), 32 km from the middle of the area, began a volume at 22:48 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
- 50%
- 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
- 80%
Warnings issued inside it
16 tornado, severe thunderstorm and flash flood warnings for its counties while it was in force.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Oct 8, 6:21 PM CDT | Severe Thunderstorm Warning | EWX | Val Verde | 54 min |
| Oct 8, 6:24 PM CDT | Flash Flood Warning | MAF | Glasscock, Howard, Midland | 3 hr |
| Oct 8, 6:39 PM CDT | Severe Thunderstorm Warning | MAF | Crane, Upton | 36 min |
| Oct 8, 7:16 PM CDT | Flash Flood Warning | MAF | Crane, Midland, Pecos, Upton | 3 hr |
| Oct 8, 7:28 PM CDT | Flash Flood Warning | MAF | Howard, Mitchell, Scurry | 3 hr |
| Oct 8, 9:01 PM CDT | Severe Thunderstorm Warning | MAF | Pecos, Reeves | 44 min |
| Oct 8, 9:03 PM CDT | Flash Flood Warning | MAF | Terrell | 3 hr |
| Oct 8, 9:33 PM CDT | Severe Thunderstorm Warning | SJT | Crockett | 42 min |
| Oct 8, 9:42 PM CDT | Flash Flood Warning | MAF | Glasscock, Howard, Midland, Reagan | 3 hr |
| Oct 8, 9:49 PM CDT | Severe Thunderstorm Warning | MAF | Brewster, Pecos | 41 min |
| Oct 8, 10:30 PM CDT | Tornado Warning | SJT | Crockett | 30 min |
| Oct 8, 10:56 PM CDT | Tornado Warning | SJT | Crockett | 34 min |
| Oct 8, 11:03 PM CDT | Flash Flood Warning | SJT | Crockett | 3 hr |
| Oct 9, 12:14 AM CDT | Tornado Warning | SJT | Sterling | 31 min |
| Oct 9, 12:17 AM CDT | Flash Flood Warning | MAF | Borden, Howard | 3 hr |
| Oct 9, 12:40 AM CDT | Tornado Warning | SJT | Sterling | 35 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 12:00Z, 10.8 hours before the alert went out and 151 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
- 1288 J/kg
- Mixed-layer CIN
- -73 J/kg
- Mixed-layer LCL
- 941 m above ground
- 0-6 km bulk shear
- 31 kt
- 0-1 km storm-relative helicity
- 257 m²/s²
- 0-3 km storm-relative helicity
- 322 m²/s²
- Significant tornado parameter
- 1.3
- Supercell composite
- 11.1
SPC that day
Everything else SPC issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Oct 8, 12:25 PM CDT | Mesoscale Discussion | SPC | Andrews, Borden, Coke, Crane, Crockett, Dawson and 14 more | 2 hr |
| Oct 8, 4:57 PM CDT | Mesoscale Discussion | SPC | Brewster, Crane, Crockett, Glasscock, Irion, Midland and 6 more | 93 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.