Alert archive / Texas / Severe Thunderstorm Watches in 2021

Severe Thunderstorm Watch 201

May 24, 2021Cimarron County, Texas County, Oklahoma; 40 counties in Texas

The Storm Prediction Center issued this severe thunderstorm watch at May 24, 2021, 3:57 PM CDT for Cimarron County, Texas County, Oklahoma; 40 counties in Texas. It was in force for 7 hr.

The area

The outline as issued.

The facts

Issued
May 24, 2021, 3:57 PM CDT (20:57 UTC)
Expired
May 24, 2021, 11:00 PM CDT
In force
7 hr
Issued by
the Storm Prediction Center
Largest hail expected
2 in
Strongest gust expected
60 kt
All 42 counties

Cimarron County, OK, Texas County, OK, Andrews County, TX, Armstrong County, TX, Bailey County, TX, Borden County, TX, Briscoe County, TX, Carson County, TX, Castro County, TX, Cochran County, TX, Crosby County, TX, Dallam County, TX, Dawson County, TX, Deaf Smith County, TX, Dickens County, TX, Floyd County, TX, Gaines County, TX, Garza County, TX, Hale County, TX, Hall County, TX, Hansford County, TX, Hartley County, TX, Hockley County, TX, Howard County, TX, Hutchinson County, TX, Kent County, TX, Lamb County, TX, Lubbock County, TX, Lynn County, TX, Martin County, TX, Mitchell County, TX, Moore County, TX, Motley County, TX, Oldham County, TX, Parmer County, TX, Potter County, TX, Randall County, TX, Scurry County, TX, Sherman County, TX, Swisher County, TX, Terry County, TX, Yoakum County, TX

The radar

The Amarillo radar (KAMA), 26 km from the middle of the area, began a volume at 20:56 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
2%
Ten or more severe wind reports
60%
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
30%
Six or more combined severe hail and wind reports
90%

Warnings issued inside it

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

IssuedProductOfficeCountiesLasted
May 24, 5:54 PM CDTSevere Thunderstorm WarningLUBHale, Hockley, Lamb, Lubbock51 min
May 24, 6:24 PM CDTSevere Thunderstorm WarningLUBCastro, Hale, Lamb, Swisher66 min
May 24, 6:36 PM CDTSevere Thunderstorm WarningLUBHockley, Lubbock24 min
May 24, 6:38 PM CDTSevere Thunderstorm WarningLUBHale, Lamb, Swisher52 min
May 24, 6:55 PM CDTSevere Thunderstorm WarningLUBHale, Hockley, Lamb50 min
May 24, 7:28 PM CDTSevere Thunderstorm WarningLUBCastro, Hale, Lamb, Swisher62 min
May 24, 7:30 PM CDTSevere Thunderstorm WarningLUBCochran, Hockley45 min
May 24, 8:42 PM CDTSevere Thunderstorm WarningLUBGarza, Kent63 min
May 24, 9:09 PM CDTSevere Thunderstorm WarningLUBFloyd, Hale42 min
May 24, 9:09 PM CDTSevere Thunderstorm WarningMAFAndrews, Loving, Winkler51 min
May 24, 9:20 PM CDTSevere Thunderstorm WarningLUBCrosby, Dickens, Garza, Kent55 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, 9.0 hours before the alert went out and 25 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, Amarillo Airport, TX at 12:00Z on 2021-05-24Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 491 joules per kilogram.LCLLFCEL10008507005003002001001 km2 km3 km6 km9 km12 km15 km-30°-20°-10°10°20°30°40°
Temperature in red, dew point in green, the mixed-layer parcel dashed.
HodographHodograph, Amarillo Airport, TX at 12:00Z on 2021-05-24The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 42 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
491 J/kg
Mixed-layer CIN
-250 J/kg
Mixed-layer LCL
1035 m above ground
0-6 km bulk shear
6 kt
0-1 km storm-relative helicity
42 m²/s²
0-3 km storm-relative helicity
136 m²/s²
Significant tornado parameter
0.0
Supercell composite
0.0

Open this sounding in Storm Lab

The text

As transmitted.

411 
WWUS20 KWNS 242053
SEL1  
SPC WW 242053
OKZ000-TXZ000-250400-

URGENT - IMMEDIATE BROADCAST REQUESTED
Severe Thunderstorm Watch Number 201
NWS Storm Prediction Center Norman OK
350 PM CDT Mon May 24 2021

The NWS Storm Prediction Center has issued a

* Severe Thunderstorm Watch for portions of 
  Oklahoma Panhandle
  West Texas

* Effective this Monday afternoon and evening from 350 PM until
  1100 PM CDT.

* Primary threats include...
  Scattered damaging wind gusts to 70 mph likely
  Scattered large hail and isolated very large hail events to 2
    inches in diameter possible
  A tornado or two possible

SUMMARY...Scattered thunderstorms are expected to develop late this
afternoon and move east with a risk for damaging wind gusts and
large hail. Thunderstorm coverage will likely increase into the
evening hours with a continued threat for damaging winds, and also
instances of large hail.

The severe thunderstorm watch area is approximately along and 55
statute miles east and west of a line from 25 miles west northwest
of Guymon OK to 95 miles south of Lubbock TX. For a complete
depiction of the watch see the associated watch outline update
(WOUS64 KWNS WOU1).

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 200...

AVIATION...A few severe thunderstorms with hail surface and aloft to
2 inches. Extreme turbulence and surface wind gusts to 60 knots. A
few cumulonimbi with maximum tops to 500. Mean storm motion vector
27020.

...Bunting

SPC that day

Everything else SPC issued on the same UTC day.

IssuedProductOfficeCountiesLasted
May 23, 7:32 PM CDTMesoscale DiscussionSPCCimarron118 min
May 24, 3:07 PM CDTMesoscale DiscussionSPCArmstrong, Bailey, Borden, Briscoe, Carson, Castro and 38 more113 min
May 24, 6:44 PM CDTMesoscale DiscussionSPCArmstrong, Briscoe, Carson, Castro, Crosby, Dawson and 14 more91 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.