Alert archive / Texas / Severe Thunderstorm Watches in 2018
Severe Thunderstorm Watch 121
The Storm Prediction Center issued this severe thunderstorm watch at May 25, 2018, 3:43 PM CDT for 14 counties in Oklahoma; 17 counties in Texas. It was in force for 6 hr.
The area
The outline as issued.
The facts
- Issued
- May 25, 2018, 3:43 PM CDT (20:43 UTC)
- Expired
- May 25, 2018, 9:59 PM CDT
- In force
- 6 hr
- Issued by
- the Storm Prediction Center
- Largest hail expected
- 2.5 in
- Strongest gust expected
- 60 kt
All 31 counties
Beckham County, OK, Comanche County, OK, Cotton County, OK, Custer County, OK, Dewey County, OK, Ellis County, OK, Greer County, OK, Harmon County, OK, Jackson County, OK, Kiowa County, OK, Roger Mills County, OK, Tillman County, OK, Washita County, OK, Woodward County, OK, Archer County, TX, Baylor County, TX, Childress County, TX, Clay County, TX, Collingsworth County, TX, Cottle County, TX, Donley County, TX, Foard County, TX, Hall County, TX, Hardeman County, TX, Hemphill County, TX, Knox County, TX, Lipscomb County, TX, Motley County, TX, Wheeler County, TX, Wichita County, TX, Wilbarger County, TX
The radar
The Altus AFB radar (KFDR), 107 km from the middle of the area, began a volume at 20:44 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
- 70%
- One or more gusts of 65 knots or more
- 20%
- 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
10 tornado, severe thunderstorm and flash flood warnings for its counties while it was in force.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| May 25, 5:57 PM CDT | Severe Thunderstorm Warning | LUB | Childress, Cottle | 63 min |
| May 25, 6:02 PM CDT | Severe Thunderstorm Warning | OUN | Foard, Hardeman | 43 min |
| May 25, 6:20 PM CDT | Severe Thunderstorm Warning | AMA | Hemphill | 70 min |
| May 25, 6:25 PM CDT | Severe Thunderstorm Warning | OUN | Foard, Hardeman | 30 min |
| May 25, 6:54 PM CDT | Severe Thunderstorm Warning | AMA | Hemphill, Wheeler | 66 min |
| May 25, 6:57 PM CDT | Severe Thunderstorm Warning | LUB | Cottle, King | 50 min |
| May 25, 7:36 PM CDT | Severe Thunderstorm Warning | AMA | Wheeler | 41 min |
| May 25, 8:03 PM CDT | Severe Thunderstorm Warning | OUN | Baylor | 42 min |
| May 25, 8:22 PM CDT | Severe Thunderstorm Warning | OUN | Beckham, Greer, Kiowa, Washita | 38 min |
| May 25, 8:57 PM CDT | Severe Thunderstorm Warning | OUN | Greer, Harmon, Jackson, Kiowa | 48 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, 8.7 hours before the alert went out and 211 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
- 919 J/kg
- Mixed-layer CIN
- -240 J/kg
- Mixed-layer LCL
- 2054 m above ground
- 0-6 km bulk shear
- 21 kt
- 0-1 km storm-relative helicity
- 1 m²/s²
- 0-3 km storm-relative helicity
- 124 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.2
SPC that day
Everything else SPC issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| May 25, 2:41 PM CDT | Mesoscale Discussion | SPC | Beckham, Custer, Ellis, Greer, Harmon, Jackson and 4 more | 3 hr |
| May 25, 6:41 PM CDT | Mesoscale Discussion | SPC | Beckham, Blaine, Caddo, Comanche, Cotton, Custer and 11 more | 64 min |
| May 25, 11:21 AM CDT | Mesoscale Discussion | SPC | Anderson, Camp, Collin, Cooke, Dallas, Delta and 23 more | 2 hr |
| May 25, 5:25 PM CDT | Mesoscale Discussion | SPC | Brown, Comanche, Eastland, Erath, Hood, Palo Pinto | 95 min |
Nearby
Severe Thunderstorm Watches in Texas, 2018Severe Thunderstorm Watches in Oklahoma, 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.