Alert archive / Texas / Severe Thunderstorm Watches in 2021
Severe Thunderstorm Watch 228
The Storm Prediction Center issued this severe thunderstorm watch at May 30, 2021, 9:17 PM CDT for 9 counties in Oklahoma; 10 counties in Texas. It was in force for 5 hr.
The area
The outline as issued.
The facts
- Issued
- May 30, 2021, 9:17 PM CDT (02:17 UTC)
- Expired
- May 31, 2021, 2:00 AM CDT
- In force
- 5 hr
- Issued by
- the Storm Prediction Center
- Largest hail expected
- 1.5 in
- Strongest gust expected
- 60 kt
Counties Beaver County, OK, Beckham County, OK, Custer County, OK, Dewey County, OK, Ellis County, OK, Greer County, OK, Harmon County, OK, Roger Mills County, OK, Woodward County, OK, Armstrong County, TX, Carson County, TX, Collingsworth County, TX, Donley County, TX, Gray County, TX, Hemphill County, TX, Lipscomb County, TX, Potter County, TX, Randall County, TX, Wheeler County, TX
The radar
The Vance AFB radar (KVNX), 175 km from the middle of the area, began a volume at 02:18 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
- 30%
- One or more gusts of 65 knots or more
- 20%
- Ten or more severe hail reports
- 20%
- One or more hailstones of 2 inches or more
- 10%
- Six or more combined severe hail and wind reports
- 50%
Warnings issued inside it
6 tornado, severe thunderstorm and flash flood warnings for its counties while it was in force.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| May 30, 10:27 PM CDT | Severe Thunderstorm Warning | AMA | Armstrong, Carson, Potter, Randall | 63 min |
| May 30, 10:38 PM CDT | Tornado Warning | AMA | Carson, Gray | 22 min |
| May 30, 10:57 PM CDT | Flash Flood Warning | AMA | Armstrong, Carson, Potter, Randall | 4 hr |
| May 31, 12:41 AM CDT | Flash Flood Warning | AMA | Armstrong, Carson, Randall | 3 hr |
| May 31, 12:47 AM CDT | Severe Thunderstorm Warning | AMA | Collingsworth, Wheeler | 58 min |
| May 31, 1:28 AM CDT | Flash Flood Warning | AMA | Donley, Gray | 3 hr |
Discussions around it
SPC mesoscale discussions over the same counties from four hours before the watch to its end.
The nearest sounding before it
Dodge City, (KDDC), launched 00:00Z, 2.3 hours before the alert went out and 183 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
- 0 J/kg
- Mixed-layer CIN
- No buoyant parcel
- Mixed-layer LCL
- 700 m above ground
- 0-6 km bulk shear
- 30 kt
- 0-1 km storm-relative helicity
- 15 m²/s²
- 0-3 km storm-relative helicity
- 205 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.0
The text
As transmitted.
088 WWUS20 KWNS 310214 SEL8 SPC WW 310214 OKZ000-TXZ000-310700- URGENT - IMMEDIATE BROADCAST REQUESTED Severe Thunderstorm Watch Number 228 NWS Storm Prediction Center Norman OK 915 PM CDT Sun May 30 2021 The NWS Storm Prediction Center has issued a * Severe Thunderstorm Watch for portions of Western Oklahoma Eastern Texas Panhandle * Effective this Sunday night and Monday morning from 915 PM until 200 AM CDT. * Primary threats include... Isolated damaging wind gusts to 70 mph possible Isolated large hail events to 1.5 inches in diameter possible A tornado or two possible SUMMARY...A cluster of storms will continue to progress eastward across the eastern Texas/Oklahoma Panhandles toward other parts of western Oklahoma. Isolated damaging wind gusts and possibly some hail may occur before storms weaken into the overnight. The severe thunderstorm watch area is approximately along and 40 statute miles east and west of a line from 40 miles east of Liberal KS to 170 miles south southeast of Liberal KS. For a complete depiction of the watch see the associated watch outline update (WOUS64 KWNS WOU8). PRECAUTIONARY/PREPAREDNESS ACTIONS... REMEMBER...A Severe Thunderstorm Watch means conditions are favorable for severe thunderstorms in and close to the watch area. Persons in these areas should be on the lookout for threatening weather conditions and listen for later statements and possible warnings. Severe thunderstorms can and occasionally do produce tornadoes. && OTHER WATCH INFORMATION...CONTINUE...WW 226...WW 227... AVIATION...A few severe thunderstorms with hail surface and aloft to 1.5 inches. Extreme turbulence and surface wind gusts to 60 knots. A few cumulonimbi with maximum tops to 500. Mean storm motion vector 28025. ...Guyer
SPC that day
Everything else SPC issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| May 30, 8:59 PM CDT | Mesoscale Discussion | SPC | Beaver, Dewey, Ellis, Roger Mills, Woodward | 91 min |
| May 30, 9:22 PM CDT | Mesoscale Discussion | SPC | Andrews, Borden, Cochran, Cottle, Crosby, Dawson and 20 more | 83 min |
| May 30, 11:43 PM CDT | Mesoscale Discussion | SPC | Bailey, Cochran, Cottle, Crosby, Dickens, Floyd and 12 more | 92 min |
| May 31, 2:12 AM CDT | Mesoscale Discussion | SPC | Borden, Fisher, Haskell, Howard, Jones, Kent and 5 more | 3 hr |
| May 31, 11:33 AM CDT | Mesoscale Discussion | SPC | Andrews, Borden, Brewster, Cochran, Crane, Crockett and 26 more | 87 min |
| May 31, 12:16 PM CDT | Severe Thunderstorm Watch | SPC | Andrews, Coke, Crane, Crockett, Culberson, Ector and 21 more | 9 hr |
| May 31, 2:15 PM CDT | Mesoscale Discussion | SPC | Bosque, Brown, Callahan, Coleman, Comanche, Coryell and 10 more | 2 hr |
| May 31, 2:54 PM CDT | Severe Thunderstorm Watch | SPC | Bell, Bosque, Comanche, Coryell, Ellis, Erath and 13 more | 4 hr |
| May 31, 3:29 PM CDT | Mesoscale Discussion | SPC | Andrews, Coke, Crane, Crockett, Culberson, Ector and 21 more | 91 min |
| May 31, 5:12 PM CDT | Mesoscale Discussion | SPC | Bell, Bosque, Coryell, Ellis, Falls, Freestone and 10 more | 93 min |
| May 31, 5:49 PM CDT | Mesoscale Discussion | SPC | Brewster, Pecos, Terrell | 116 min |
Nearby
Severe Thunderstorm Watches in Texas, 2021Severe Thunderstorm Watches in Oklahoma, 2021Every severe thunderstorm watch in 2021
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.