Alert archive / Texas / Severe Thunderstorm Watches in 2021

Severe Thunderstorm Watch 229

May 31, 20215 counties in New Mexico; 27 counties in Texas

The Storm Prediction Center issued this severe thunderstorm watch at May 31, 2021, 11:16 AM MDT for 5 counties in New Mexico; 27 counties in Texas. It was in force for 9 hr.

The area

The outline as issued.

The facts

Issued
May 31, 2021, 11:16 AM MDT (17:16 UTC)
Expired
May 31, 2021, 8:00 PM MDT
In force
9 hr
Issued by
the Storm Prediction Center
Largest hail expected
3 in
Strongest gust expected
60 kt
All 32 counties

Chaves County, NM, Eddy County, NM, Lea County, NM, Lincoln County, NM, Socorro County, NM, Andrews County, TX, Coke County, TX, Crane County, TX, Crockett County, TX, Culberson County, TX, Ector County, TX, Gaines County, TX, Glasscock County, TX, Howard County, TX, Irion County, TX, Jeff Davis County, TX, Loving County, TX, Martin County, TX, Midland County, TX, Mitchell County, TX, Nolan County, TX, Pecos County, TX, Reagan County, TX, Reeves County, TX, Schleicher County, TX, Sterling County, TX, Sutton County, TX, Terrell County, TX, Tom Green County, TX, Upton County, TX, Ward County, TX, Winkler County, TX

The radar

The Midland/Odessa radar (KMAF), 159 km from the middle of the area, began a volume at 17:18 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
20%
One or more gusts of 65 knots or more
10%
Ten or more severe hail reports
60%
One or more hailstones of 2 inches or more
40%
Six or more combined severe hail and wind reports
80%

Warnings issued inside it

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

IssuedProductOfficeCountiesLasted
May 31, 11:57 AM MDTFlash Flood WarningMAFHoward2 hr
May 31, 12:03 PM MDTSevere Thunderstorm WarningABQSocorro42 min
May 31, 12:15 PM MDTSevere Thunderstorm WarningMAFEddy, Lea60 min
May 31, 1:24 PM MDTSevere Thunderstorm WarningABQLincoln, Socorro66 min
May 31, 1:30 PM MDTSevere Thunderstorm WarningMAFPecos60 min
May 31, 1:44 PM MDTSevere Thunderstorm WarningMAFEddy, Lea61 min
May 31, 1:52 PM MDTTornado WarningABQLincoln, Socorro38 min
May 31, 1:59 PM MDTSevere Thunderstorm WarningABQSocorro39 min
May 31, 2:17 PM MDTSevere Thunderstorm WarningMAFLea58 min
May 31, 2:18 PM MDTSevere Thunderstorm WarningMAFPecos57 min
May 31, 2:24 PM MDTTornado Warning Tornado observedMAFPecos36 min
May 31, 2:51 PM MDTSevere Thunderstorm WarningMAFPecos54 min
May 31, 2:58 PM MDTTornado Warning Tornado observedMAFPecos32 min
May 31, 3:12 PM MDTSevere Thunderstorm WarningMAFLoving, Reeves, Ward, Winkler63 min
May 31, 3:30 PM MDTTornado Warning Tornado observedMAFPecos, Terrell45 min
May 31, 3:36 PM MDTSevere Thunderstorm WarningMAFPecos, Terrell39 min
May 31, 4:12 PM MDTSevere Thunderstorm WarningMAFBrewster, Pecos, Terrell63 min
May 31, 4:12 PM MDTSevere Thunderstorm WarningMAFCrane, Pecos, Reeves, Ward63 min
May 31, 4:15 PM MDTTornado Warning Tornado observedMAFPecos, Terrell45 min
May 31, 4:23 PM MDTTornado WarningMAFBrewster, Pecos, Terrell52 min
May 31, 4:58 PM MDTSevere Thunderstorm WarningMAFTerrell62 min
May 31, 4:59 PM MDTSevere Thunderstorm WarningMAFBrewster, Jeff Davis, Pecos, Reeves61 min
May 31, 5:05 PM MDTSevere Thunderstorm WarningMAFEddy25 min
May 31, 5:08 PM MDTSevere Thunderstorm WarningABQChaves24 min
May 31, 5:11 PM MDTTornado WarningMAFBrewster, Terrell49 min
May 31, 5:49 PM MDTSevere Thunderstorm WarningMAFBrewster, Pecos56 min
May 31, 5:50 PM MDTSevere Thunderstorm WarningMAFPecos, Reeves55 min
May 31, 5:57 PM MDTTornado WarningMAFTerrell33 min
May 31, 6:26 PM MDTTornado WarningMAFTerrell34 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, 5.3 hours before the alert went out and 157 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 2021-05-31Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 1949 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 2021-05-31The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 149 square meters per square second.19395878Sfc1 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
1949 J/kg
Mixed-layer CIN
0 J/kg
Mixed-layer LCL
516 m above ground
0-6 km bulk shear
40 kt
0-1 km storm-relative helicity
149 m²/s²
0-3 km storm-relative helicity
119 m²/s²
Significant tornado parameter
1.2
Supercell composite
7.1

Open this sounding in Storm Lab

The text

As transmitted.

739 
WWUS20 KWNS 311714
SEL9  
SPC WW 311714
NMZ000-TXZ000-010000-

URGENT - IMMEDIATE BROADCAST REQUESTED
Severe Thunderstorm Watch Number 229
NWS Storm Prediction Center Norman OK
1215 PM CDT Mon May 31 2021

The NWS Storm Prediction Center has issued a

* Severe Thunderstorm Watch for portions of 
  Southeast New Mexico
  Southwest Texas

* Effective this Monday afternoon and evening from 1215 PM until
  700 PM CDT.

* Primary threats include...
  Scattered large hail likely with isolated very large hail events
    to 3 inches in diameter possible
  Isolated damaging wind gusts to 70 mph possible
  A tornado or two possible

SUMMARY...Thunderstorms are expected to intensify this afternoon
over the mountains of southern New Mexico - and across parts of
southwest Texas.  A few of these storms are likely to become
supercells, capable of very large hail and gusty winds.  A tornado
or two is also possible.

The severe thunderstorm watch area is approximately along and 60
statute miles north and south of a line from 35 miles west southwest
of Ruidoso NM to 30 miles southeast of San Angelo TX. For a complete
depiction of the watch see the associated watch outline update
(WOUS64 KWNS WOU9).

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.

&&

AVIATION...A few severe thunderstorms with hail surface and aloft to
3 inches. Extreme turbulence and surface wind gusts to 60 knots. A
few cumulonimbi with maximum tops to 500. Mean storm motion vector
28030.

...Hart

SPC that day

Everything else SPC issued on the same UTC day.

IssuedProductOfficeCountiesLasted
May 30, 8:22 PM MDTMesoscale DiscussionSPCLea83 min
May 31, 8:18 AM MDTMesoscale DiscussionSPCChaves, Curry, De Baca, Lincoln, Roosevelt57 min
May 31, 10:33 AM MDTMesoscale DiscussionSPCChaves, De Baca, Eddy, Lea, Lincoln, Roosevelt and 1 more87 min
May 31, 12:47 PM MDTMesoscale DiscussionSPCBernalillo, Cibola, Los Alamos, McKinley, Rio Arriba, Sandoval and 3 more88 min
May 31, 2:29 PM MDTMesoscale DiscussionSPCChaves, Eddy, Lea, Lincoln, Socorro91 min
May 31, 5:17 PM MDTMesoscale DiscussionSPCOtero88 min
May 30, 7:59 PM MDTMesoscale DiscussionSPCCarson, Gray, Hansford, Hemphill, Hutchinson, Lipscomb and 6 more91 min
May 30, 8:17 PM MDTSevere Thunderstorm WatchSPCArmstrong, Carson, Collingsworth, Donley, Gray, Hemphill and 4 more5 hr
May 30, 10:43 PM MDTMesoscale DiscussionSPCBailey, Cochran, Cottle, Crosby, Dickens, Floyd and 12 more92 min
May 31, 1:12 AM MDTMesoscale DiscussionSPCBorden, Fisher, Haskell, Howard, Jones, Kent and 5 more3 hr
May 31, 1:15 PM MDTMesoscale DiscussionSPCBosque, Brown, Callahan, Coleman, Comanche, Coryell and 10 more2 hr
May 31, 1:54 PM MDTSevere Thunderstorm WatchSPCBell, Bosque, Comanche, Coryell, Ellis, Erath and 13 more4 hr
May 31, 4:12 PM MDTMesoscale DiscussionSPCBell, Bosque, Coryell, Ellis, Falls, Freestone and 10 more93 min
May 31, 4:49 PM MDTMesoscale DiscussionSPCBrewster, Pecos, Terrell116 min

Nearby

Severe Thunderstorm Watches in Texas, 2021Severe Thunderstorm Watches in New Mexico, 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.