Alert archive / Texas / Severe Thunderstorm Watches in 2021

Severe Thunderstorm Watch 224

May 29, 2021Harding County, Union County, New Mexico; Cimarron County, Texas County, Oklahoma; 4 counties in Texas

The Storm Prediction Center issued this severe thunderstorm watch at May 29, 2021, 6:28 PM MDT for Harding County, Union County, New Mexico; Cimarron County, Texas County, Oklahoma; 4 counties in Texas. It was in force for 8 hr.

The area

The outline as issued.

The facts

Issued
May 29, 2021, 6:28 PM MDT (00:28 UTC)
Expired
May 30, 2021, 2:00 AM MDT
In force
8 hr
Issued by
the Storm Prediction Center
Largest hail expected
2 in
Strongest gust expected
60 kt

Counties Harding County, NM, Union County, NM, Cimarron County, OK, Texas County, OK, Dallam County, TX, Hartley County, TX, Oldham County, TX, Sherman County, TX

The radar

The Amarillo radar (KAMA), 186 km from the middle of the area, began a volume at 00:31 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
10%
Ten or more severe wind reports
30%
One or more gusts of 65 knots or more
10%
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
60%

Warnings issued inside it

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

IssuedProductOfficeCountiesLasted
May 29, 6:43 PM MDTTornado Warning Tornado observedABQUnion47 min
May 29, 6:45 PM MDTTornado Warning Tornado observedConsiderable damage threatAMACimarron45 min
May 29, 7:27 PM MDTTornado WarningABQUnion24 min
May 29, 7:27 PM MDTTornado WarningAMACimarron48 min
May 29, 7:42 PM MDTSevere Thunderstorm WarningABQHarding, Mora33 min
May 29, 8:05 PM MDTTornado Warning Tornado observedAMACimarron55 min
May 29, 8:08 PM MDTSevere Thunderstorm WarningABQHarding15 min
May 29, 8:20 PM MDTSevere Thunderstorm WarningABQHarding, Mora, San Miguel25 min
May 29, 8:43 PM MDTSevere Thunderstorm WarningABQHarding, Mora, San Miguel62 min
May 29, 8:51 PM MDTTornado Warning Tornado observedConsiderable damage threatAMACimarron54 min
May 29, 9:41 PM MDTSevere Thunderstorm WarningAMACimarron64 min
May 29, 10:06 PM MDTSevere Thunderstorm WarningABQHarding, San Miguel39 min
May 29, 10:43 PM MDTSevere Thunderstorm WarningABQHarding, San Miguel62 min
May 29, 11:42 PM MDTSevere Thunderstorm WarningABQHarding, Quay, San Miguel49 min
May 30, 12:08 AM MDTSevere Thunderstorm WarningAMAHartley, Oldham64 min
May 30, 12:10 AM MDTSevere Thunderstorm WarningABQQuay, Union20 min
May 30, 12:40 AM MDTTornado WarningAMAOldham16 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 00:00Z, 0.5 hours before the alert went out and 187 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 00:00Z on 2021-05-30Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 70 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, Amarillo Airport, TX at 00:00Z on 2021-05-30The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 84 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
70 J/kg
Mixed-layer CIN
-344 J/kg
Mixed-layer LCL
758 m above ground
0-6 km bulk shear
35 kt
0-1 km storm-relative helicity
84 m²/s²
0-3 km storm-relative helicity
194 m²/s²
Significant tornado parameter
0.0
Supercell composite
-0.1

Open this sounding in Storm Lab

The text

As transmitted.

171 
WWUS20 KWNS 300026
SEL4  
SPC WW 300026
NMZ000-OKZ000-TXZ000-300600-

URGENT - IMMEDIATE BROADCAST REQUESTED
Severe Thunderstorm Watch Number 224
NWS Storm Prediction Center Norman OK
730 PM CDT Sat May 29 2021

The NWS Storm Prediction Center has issued a

* Severe Thunderstorm Watch for portions of 
  Northeast New Mexico
  Oklahoma Panhandle
  Texas Panhandle

* Effective this Saturday night and Sunday morning from 730 PM
  until 100 AM CDT.

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

SUMMARY...Initially, an isolated supercell moving southeastward
between Kim and Campo, Colorado will move into the western Oklahoma
Panhandle. Other development may occur across northeast New Mexico
and/or across other parts of southeast Colorado this evening via an
upscale-growing cluster of storms.

The severe thunderstorm watch area is approximately along and 40
statute miles north and south of a line from 50 miles west southwest
of Clayton NM to 25 miles south southeast of Elkhart KS. For a
complete depiction of the watch see the associated watch outline
update (WOUS64 KWNS WOU4).

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 223...

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
29020.

...Guyer

SPC that day

Everything else SPC issued on the same UTC day.

IssuedProductOfficeCountiesLasted
May 29, 10:37 PM MDTMesoscale DiscussionSPCHamilton, Morton, Stanton53 min
May 29, 8:20 PM MDTMesoscale DiscussionSPCHarding, Union85 min
May 29, 10:59 PM MDTMesoscale DiscussionSPCHarding, Union61 min
May 30, 11:08 AM MDTMesoscale DiscussionSPCChaves, Colfax, Curry, De Baca, Eddy, Guadalupe and 10 more97 min
May 30, 11:41 AM MDTSevere Thunderstorm WatchSPCChaves, Colfax, Curry, De Baca, Guadalupe, Harding and 9 more8 hr
May 30, 5:03 PM MDTSevere Thunderstorm WatchSPCEddy, Lea7 hr
May 30, 5:43 PM MDTMesoscale DiscussionSPCChaves, De Baca, Guadalupe, Lincoln, Roosevelt, Torrance62 min
May 30, 2:52 PM MDTMesoscale DiscussionSPCBeaver, Cimarron, Texas113 min
May 30, 3:42 PM MDTTornado WatchSPCCimarron, Texas7 hr
May 30, 5:04 PM MDTMesoscale DiscussionSPCCimarron, Texas86 min
May 30, 1:00 AM MDTMesoscale DiscussionSPCCastro, Deaf Smith, Oldham, Parmer, Potter, Randall60 min
May 30, 4:37 PM MDTMesoscale DiscussionSPCBailey, Briscoe, Castro, Cochran, Cottle, Crosby and 16 more83 min

Nearby

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