Alert archive / Texas / Tornado Watches in 2021

Tornado Watch 226

May 30, 2021Cimarron County, Texas County, Oklahoma; 16 counties in Texas

The Storm Prediction Center issued this tornado watch at May 30, 2021, 4:42 PM CDT for Cimarron County, Texas County, Oklahoma; 16 counties in Texas. It was in force for 7 hr.

The area

The outline as issued.

The facts

Issued
May 30, 2021, 4:42 PM CDT (21:42 UTC)
Expired
May 31, 2021, 12:00 AM CDT
In force
7 hr
Issued by
the Storm Prediction Center
Largest hail expected
2.5 in
Strongest gust expected
60 kt

Counties Cimarron County, OK, Texas County, OK, Armstrong County, TX, Carson County, TX, Dallam County, TX, Deaf Smith County, TX, Donley County, TX, Gray County, TX, Hansford County, TX, Hartley County, TX, Hutchinson County, TX, Moore County, TX, Ochiltree County, TX, Oldham County, TX, Potter County, TX, Randall County, TX, Roberts County, TX, Sherman County, TX

The radar

The Amarillo radar (KAMA), 103 km from the middle of the area, began a volume at 21:42 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
30%
One or more EF2 to EF5 tornadoes
10%
Ten or more severe wind reports
40%
One or more gusts of 65 knots or more
20%
Ten or more severe hail reports
50%
One or more hailstones of 2 inches or more
30%
Six or more combined severe hail and wind reports
70%

Warnings issued inside it

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

IssuedProductOfficeCountiesLasted
May 30, 5:08 PM CDTTornado Warning Tornado observedAMACimarron28 min
May 30, 5:14 PM CDTSevere Thunderstorm WarningAMACimarron61 min
May 30, 5:35 PM CDTSevere Thunderstorm WarningAMACimarron55 min
May 30, 5:39 PM CDTTornado Warning Tornado observedAMACimarron51 min
May 30, 5:49 PM CDTTornado WarningAMACimarron41 min
May 30, 6:08 PM CDTTornado WarningAMADallam, Sherman52 min
May 30, 6:14 PM CDTTornado Warning Tornado observedAMACimarron46 min
May 30, 6:26 PM CDTTornado WarningAMACimarron21 min
May 30, 6:54 PM CDTTornado WarningAMACimarron51 min
May 30, 6:58 PM CDTTornado WarningAMACimarron47 min
May 30, 7:22 PM CDTSevere Thunderstorm WarningAMAHartley, Moore, Oldham, Potter68 min
May 30, 7:29 PM CDTTornado WarningAMASherman46 min
May 30, 7:46 PM CDTSevere Thunderstorm WarningAMADallam, Sherman59 min
May 30, 8:14 PM CDTTornado WarningAMAHansford, Sherman46 min
May 30, 8:47 PM CDTSevere Thunderstorm WarningAMATexas58 min
May 30, 10:27 PM CDTSevere Thunderstorm WarningAMAArmstrong, Carson, Potter, Randall63 min
May 30, 10:38 PM CDTTornado WarningAMACarson, Gray22 min
May 30, 10:57 PM CDTFlash Flood WarningAMAArmstrong, Carson, Potter, Randall4 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

Amarillo Airport, TX (KAMA), launched 12:00Z, 9.7 hours before the alert went out and 104 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 2021-05-30Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 64 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 12:00Z on 2021-05-30The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 51 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
64 J/kg
Mixed-layer CIN
-307 J/kg
Mixed-layer LCL
1320 m above ground
0-6 km bulk shear
39 kt
0-1 km storm-relative helicity
51 m²/s²
0-3 km storm-relative helicity
188 m²/s²
Significant tornado parameter
0.0
Supercell composite
0.0

Open this sounding in Storm Lab

The text

As transmitted.

657 
WWUS20 KWNS 302136
SEL6  
SPC WW 302136
OKZ000-TXZ000-310500-

URGENT - IMMEDIATE BROADCAST REQUESTED
Tornado Watch Number 226
NWS Storm Prediction Center Norman OK
435 PM CDT Sun May 30 2021

The NWS Storm Prediction Center has issued a

* Tornado Watch for portions of 
  Oklahoma Panhandle
  Texas Panhandle

* Effective this Sunday afternoon from 435 PM until Midnight CDT.

* Primary threats include...
  A couple tornadoes possible
  Scattered large hail and isolated very large hail events to 2.5
    inches in diameter possible
  Scattered damaging wind gusts to 70 mph possible

SUMMARY...Initially, a supercell across far southeast Colorado may
continue to move southeastward into the western Oklahoma Panhandle
while additional storms develop generally eastward out of northeast
New Mexico. Some supercells capable of large hail can be expected,
and a tornado threat will also exist, particularly with storms
interacting with a west/northwest-east/southeast-oriented outflow
boundary. With time, eventual storm mergers should lead to upscale
quasi-linear growth/organization this evening along with an
increasing damaging wind risk and some continued tornado potential
with embedded circulations.

The tornado watch area is approximately along and 75 statute miles
north and south of a line from 25 miles west southwest of Dalhart TX
to 40 miles east northeast of Borger TX. For a complete depiction of
the watch see the associated watch outline update (WOUS64 KWNS
WOU6).

PRECAUTIONARY/PREPAREDNESS ACTIONS...

REMEMBER...A Tornado Watch means conditions are favorable for
tornadoes and 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.

&&

OTHER WATCH INFORMATION...CONTINUE...WW 225...

AVIATION...Tornadoes and a few severe thunderstorms with hail
surface and aloft to 2.5 inches. Extreme turbulence and surface wind
gusts to 60 knots. A few cumulonimbi with maximum tops to 500. Mean
storm motion vector 29015.

...Guyer

SPC that day

Everything else SPC issued on the same UTC day.

IssuedProductOfficeCountiesLasted
May 29, 7:28 PM CDTSevere Thunderstorm WatchSPCCimarron, Texas8 hr
May 29, 9:20 PM CDTMesoscale DiscussionSPCCimarron85 min
May 29, 11:59 PM CDTMesoscale DiscussionSPCCimarron61 min
May 30, 3:52 PM CDTMesoscale DiscussionSPCBeaver, Cimarron, Texas113 min
May 30, 6:04 PM CDTMesoscale DiscussionSPCCimarron, Texas86 min
May 30, 2:00 AM CDTMesoscale DiscussionSPCCastro, Deaf Smith, Oldham, Parmer, Potter, Randall60 min
May 30, 5:37 PM CDTMesoscale DiscussionSPCBailey, Briscoe, Castro, Cochran, Cottle, Crosby and 16 more83 min
May 30, 6:03 PM CDTSevere Thunderstorm WatchSPCAndrews, Bailey, Borden, Briscoe, Castro, Childress and 30 more7 hr

Nearby

Tornado Watches in Texas, 2021Tornado Watches in Oklahoma, 2021Every tornado 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.