Alert archive / Texas / Severe Thunderstorm Watches in 2021

Severe Thunderstorm Watch 216

May 27, 202152 counties in Texas

The Storm Prediction Center issued this severe thunderstorm watch at May 27, 2021, 3:39 PM CDT for 52 counties in Texas. It was in force for 7 hr.

The area

The outline as issued.

The facts

Issued
May 27, 2021, 3:39 PM CDT (20:39 UTC)
Expired
May 27, 2021, 11:00 PM CDT
In force
7 hr
Issued by
the Storm Prediction Center
Largest hail expected
2.5 in
Strongest gust expected
65 kt
All 52 counties

Archer County, TX, Baylor County, TX, Borden County, TX, Brewster County, TX, Briscoe County, TX, Callahan County, TX, Childress County, TX, Coke County, TX, Collingsworth County, TX, Cottle County, TX, Crane County, TX, Crockett County, TX, Crosby County, TX, Dawson County, TX, Dickens County, TX, Donley County, TX, Ector County, TX, Fisher County, TX, Floyd County, TX, Foard County, TX, Garza County, TX, Glasscock County, TX, Hall County, TX, Hardeman County, TX, Haskell County, TX, Howard County, TX, Irion County, TX, Jones County, TX, Kent County, TX, King County, TX, Knox County, TX, Lynn County, TX, Martin County, TX, Midland County, TX, Mitchell County, TX, Motley County, TX, Nolan County, TX, Pecos County, TX, Reagan County, TX, Runnels County, TX, Scurry County, TX, Shackelford County, TX, Sterling County, TX, Stonewall County, TX, Taylor County, TX, Terrell County, TX, Throckmorton County, TX, Tom Green County, TX, Upton County, TX, Wheeler County, TX, Wichita County, TX, Wilbarger County, TX

The radar

The Midland/Odessa radar (KMAF), 67 km from the middle of the area, began a volume at 20:42 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
60%
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

28 tornado, severe thunderstorm and flash flood warnings for its counties while it was in force.

IssuedProductOfficeCountiesLasted
May 27, 3:45 PM CDTSevere Thunderstorm WarningMAFPecos, Terrell60 min
May 27, 4:19 PM CDTSevere Thunderstorm WarningMAFEctor, Midland56 min
May 27, 4:41 PM CDTSevere Thunderstorm WarningMAFBrewster, Jeff Davis, Pecos64 min
May 27, 4:44 PM CDTSevere Thunderstorm WarningMAFPecos, Terrell38 min
May 27, 5:01 PM CDTSevere Thunderstorm WarningMAFHoward, Martin59 min
May 27, 5:14 PM CDTSevere Thunderstorm WarningMAFMartin, Midland37 min
May 27, 5:25 PM CDTSevere Thunderstorm WarningMAFPecos49 min
May 27, 6:03 PM CDTSevere Thunderstorm WarningMAFBrewster, Pecos, Terrell72 min
May 27, 6:15 PM CDTSevere Thunderstorm WarningMAFGlasscock60 min
May 27, 6:40 PM CDTSevere Thunderstorm WarningSJTCoke, Sterling65 min
May 27, 6:55 PM CDTSevere Thunderstorm WarningLUBBriscoe, Floyd, Hall, Motley50 min
May 27, 7:04 PM CDTSevere Thunderstorm WarningAMAArmstrong, Donley37 min
May 27, 7:12 PM CDTSevere Thunderstorm WarningMAFBrewster, Pecos, Terrell93 min
May 27, 7:24 PM CDTFlash Flood WarningSJTCoke, Sterling3 hr
May 27, 7:28 PM CDTSevere Thunderstorm WarningMAFGlasscock40 min
May 27, 7:40 PM CDTSevere Thunderstorm WarningSJTCoke, Sterling65 min
May 27, 7:51 PM CDTSevere Thunderstorm WarningOUNHardeman39 min
May 27, 8:04 PM CDTFlash Flood WarningSJTSterling3 hr
May 27, 8:10 PM CDTSevere Thunderstorm WarningLUBCottle27 min
May 27, 8:11 PM CDTSevere Thunderstorm WarningSJTCoke, Runnels64 min
May 27, 8:26 PM CDTSevere Thunderstorm WarningOUNHardeman, Wilbarger49 min
May 27, 8:39 PM CDTSevere Thunderstorm WarningSJTRunnels, Tom Green66 min
May 27, 8:41 PM CDTSevere Thunderstorm WarningMAFBrewster, Terrell79 min
May 27, 9:06 PM CDTSevere Thunderstorm WarningOUNWilbarger39 min
May 27, 10:04 PM CDTSevere Thunderstorm WarningOUNClay, Wichita41 min
May 27, 10:28 PM CDTSevere Thunderstorm WarningLUBCottle32 min
May 27, 10:36 PM CDTSevere Thunderstorm WarningOUNFoard39 min
May 27, 11:00 PM CDTSevere Thunderstorm WarningOUNFoard, Knox45 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, 8.7 hours before the alert went out and 68 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.

Skew-T log-pSkew-T log-p diagram, Midland Regional, TX at 12:00Z on 2021-05-27Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 1927 joules per kilogram.LCLLFCEL10008507005003002001001 km2 km3 km6 km9 km12 km15 km-30°-20°-10°0°10°20°30°40°
Temperature in red, dew point in green, the mixed-layer parcel dashed.
HodographHodograph, Midland Regional, TX at 12:00Z on 2021-05-27The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 246 square meters per square second.193958Sfc1 km3 km6 km9 kmRMLM
The wind turning with height, colored by layer: ground to 1 km, 1 to 3 km, 3 to 6 km, 6 to 10 km.
Mixed-layer CAPE
1927 J/kg
Mixed-layer CIN
-261 J/kg
Mixed-layer LCL
1145 m above ground
0-6 km bulk shear
39 kt
0-1 km storm-relative helicity
246 m²/s²
0-3 km storm-relative helicity
245 m²/s²
Significant tornado parameter
0.0
Supercell composite
0.3

Open this sounding in Storm Lab

The text

As transmitted.

212 
WWUS20 KWNS 272036
SEL6  
SPC WW 272036
TXZ000-280400-

URGENT - IMMEDIATE BROADCAST REQUESTED
Severe Thunderstorm Watch Number 216
NWS Storm Prediction Center Norman OK
340 PM CDT Thu May 27 2021

The NWS Storm Prediction Center has issued a

* Severe Thunderstorm Watch for portions of 
  West and West Central Texas

* Effective this Thursday afternoon and evening from 340 PM until
  1100 PM CDT.

* Primary threats include...
  Scattered damaging winds and isolated significant gusts to 75
    mph likely
  Scattered large hail and isolated very large hail events to 2.5
    inches in diameter likely
  A tornado or two possible

SUMMARY...Thunderstorms will form along the dryline, and along a
cold front sagging into west Texas this afternoon.  Supercells
capable of very large hail and damaging winds will be possible.

The severe thunderstorm watch area is approximately along and 50
statute miles east and west of a line from 35 miles southwest of
Dryden TX to 15 miles west northwest of Altus OK. For a complete
depiction of the watch see the associated watch outline update
(WOUS64 KWNS WOU6).

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 214...WW 215...

AVIATION...A few severe thunderstorms with hail surface and aloft to
2.5 inches. Extreme turbulence and surface wind gusts to 65 knots. A
few cumulonimbi with maximum tops to 500. Mean storm motion vector
27030.

...Hart

SPC that day

Everything else SPC issued on the same UTC day.

IssuedProductOfficeCountiesLasted
May 26, 7:32 PM CDTMesoscale DiscussionSPCBeaver, Ellis, Harper88 min
May 26, 11:26 PM CDTMesoscale DiscussionSPCAlfalfa, Beckham, Blaine, Caddo, Canadian, Custer and 20 more64 min
May 27, 11:04 AM CDTMesoscale DiscussionSPCAdair, Cherokee, Craig, Delaware, Mayes, Nowata and 5 more86 min
May 27, 11:29 AM CDTMesoscale DiscussionSPCAdair, Alfalfa, Beckham, Blaine, Caddo, Canadian and 39 more61 min
May 27, 11:58 AM CDTTornado WatchSPCAdair, Alfalfa, Atoka, Beckham, Blaine, Bryan and 66 more9 hr
May 27, 1:39 PM CDTMesoscale DiscussionSPCBlaine, Garfield, Grant, Kay, Kingfisher, Logan and 6 more66 min
May 27, 3:25 PM CDTMesoscale DiscussionSPCBlaine, Canadian, Craig, Creek, Custer, Dewey and 13 more95 min
May 27, 5:34 PM CDTMesoscale DiscussionSPCCaddo, Cleveland, Comanche, Garvin, Grady, McClain and 2 more56 min
May 27, 6:24 PM CDTMesoscale DiscussionSPCHarmon2 hr
May 27, 2:50 PM CDTMesoscale DiscussionSPCBorden, Childress, Coke, Collingsworth, Cottle, Crane and 34 more115 min

Nearby

Severe Thunderstorm Watches in Texas, 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.