Alert archive / Texas / Severe Thunderstorm Watches in 2021

Severe Thunderstorm Watch 371

July 11, 20216 counties in New Mexico; 20 counties in Texas

The Storm Prediction Center issued this severe thunderstorm watch at Jul 11, 2021, 11:16 AM MDT for 6 counties in New Mexico; 20 counties in Texas. It was in force for 7 hr.

The area

The outline as issued.

The facts

Issued
Jul 11, 2021, 11:16 AM MDT (17:16 UTC)
Expired
Jul 11, 2021, 6:00 PM MDT
In force
7 hr
Issued by
the Storm Prediction Center
Largest hail expected
2 in
Strongest gust expected
55 kt
All 26 counties

Chaves County, NM, De Baca County, NM, Eddy County, NM, Lea County, NM, Lincoln County, NM, Roosevelt County, NM, Andrews County, TX, Borden County, TX, Cochran County, TX, Dawson County, TX, Ector County, TX, Gaines County, TX, Garza County, TX, Glasscock County, TX, Hockley County, TX, Howard County, TX, Kent County, TX, Loving County, TX, Lynn County, TX, Martin County, TX, Midland County, TX, Mitchell County, TX, Scurry County, TX, Terry County, TX, Winkler County, TX, Yoakum County, TX

The radar

The Cannon AFB radar (KFDX), 139 km from the middle of the area, began a volume at 17:15 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
10%
One or more EF2 to EF5 tornadoes
2%
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
70%

Warnings issued inside it

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

IssuedProductOfficeCountiesLasted
Jul 11, 11:56 AM MDTSevere Thunderstorm WarningABQChaves49 min
Jul 11, 12:03 PM MDTSevere Thunderstorm WarningMAFLea57 min
Jul 11, 12:14 PM MDTSevere Thunderstorm WarningLUBCochran, Yoakum47 min
Jul 11, 12:38 PM MDTFlash Flood WarningABQChaves3 hr
Jul 11, 12:54 PM MDTSevere Thunderstorm WarningLUBCochran, Hockley, Terry, Yoakum66 min
Jul 11, 1:15 PM MDTSevere Thunderstorm WarningABQChaves45 min
Jul 11, 1:49 PM MDTSevere Thunderstorm WarningLUBHockley, Terry56 min
Jul 11, 1:56 PM MDTSevere Thunderstorm WarningLUBBailey, Cochran, Hockley, Lamb20 min
Jul 11, 1:59 PM MDTSevere Thunderstorm WarningABQChaves46 min
Jul 11, 2:06 PM MDTFlash Flood WarningLUBCochran, Hockley, Terry, Yoakum81 min
Jul 11, 2:08 PM MDTSevere Thunderstorm WarningABQChaves52 min
Jul 11, 2:12 PM MDTSevere Thunderstorm WarningLUBGarza, Kent31 min
Jul 11, 2:23 PM MDTFlash Flood WarningABQChaves3 hr
Jul 11, 2:25 PM MDTSevere Thunderstorm WarningLUBLynn, Terry25 min
Jul 11, 2:44 PM MDTSevere Thunderstorm WarningABQChaves46 min
Jul 11, 2:58 PM MDTSevere Thunderstorm WarningABQChaves62 min
Jul 11, 3:22 PM MDTSevere Thunderstorm WarningABQChaves, Lincoln38 min
Jul 11, 3:27 PM MDTSevere Thunderstorm WarningABQChaves33 min
Jul 11, 3:28 PM MDTSevere Thunderstorm WarningMAFEddy62 min
Jul 11, 3:34 PM MDTSevere Thunderstorm WarningABQRoosevelt41 min
Jul 11, 3:57 PM MDTSevere Thunderstorm WarningABQChaves, Roosevelt32 min
Jul 11, 3:59 PM MDTSevere Thunderstorm WarningABQLincoln46 min
Jul 11, 4:31 PM MDTSevere Thunderstorm WarningMAFEddy59 min
Jul 11, 4:50 PM MDTSevere Thunderstorm WarningABQLincoln40 min
Jul 11, 4:54 PM MDTSevere Thunderstorm WarningABQLincoln51 min
Jul 11, 5:21 PM MDTFlash Flood WarningMAFGlasscock4 hr
Jul 11, 5:48 PM MDTSevere Thunderstorm WarningABQLincoln57 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 238 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 2021-07-11Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 964 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 2021-07-11The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 1 square meters per square second.1939Sfc1 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
964 J/kg
Mixed-layer CIN
-244 J/kg
Mixed-layer LCL
1122 m above ground
0-6 km bulk shear
20 kt
0-1 km storm-relative helicity
1 m²/s²
0-3 km storm-relative helicity
34 m²/s²
Significant tornado parameter
0.0
Supercell composite
0.5

Open this sounding in Storm Lab

The text

As transmitted.

900 
WWUS20 KWNS 111713
SEL1  
SPC WW 111713
NMZ000-TXZ000-120000-

URGENT - IMMEDIATE BROADCAST REQUESTED
Severe Thunderstorm Watch Number 371
NWS Storm Prediction Center Norman OK
1115 AM MDT Sun Jul 11 2021

The NWS Storm Prediction Center has issued a

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

* Effective this Sunday morning and evening from 1115 AM until
  600 PM MDT.

* Primary threats include...
  Scattered large hail and isolated very large hail events to 2
    inches in diameter possible
  Isolated damaging wind gusts to 65 mph possible

SUMMARY...Within a seasonally moist air mass, scattered strong to
severe thunderstorms will continue to develop across the region this
afternoon and generally drift southward. The strongest storms will
be capable of large hail and severe-caliber wind gusts.

The severe thunderstorm watch area is approximately along and 75
statute miles north and south of a line from 60 miles west northwest
of Roswell NM to 50 miles north northeast of Midland 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.

&&

AVIATION...A few severe thunderstorms with hail surface and aloft to
2 inches. Extreme turbulence and surface wind gusts to 55 knots. A
few cumulonimbi with maximum tops to 550. Mean storm motion vector
35020.

...Guyer

SPC that day

Everything else SPC issued on the same UTC day.

IssuedProductOfficeCountiesLasted
Jul 10, 8:49 PM MDTMesoscale DiscussionSPCColfax, Harding, Mora86 min
Jul 11, 10:48 AM MDTMesoscale DiscussionSPCEddy, Lea87 min
Jul 11, 1:33 PM MDTMesoscale DiscussionSPCBernalillo, Chaves, De Baca, Doña Ana, Eddy, Grant and 12 more87 min
Jul 11, 2:23 PM MDTSevere Thunderstorm WatchSPCBernalillo, Catron, Cibola, Doña Ana, Grant, Guadalupe and 14 more8 hr
Jul 11, 5:18 PM MDTMesoscale DiscussionSPCDoña Ana, Otero87 min
Jul 10, 8:21 PM MDTMesoscale DiscussionSPCClay, Wichita84 min
Jul 10, 8:35 PM MDTSevere Thunderstorm WatchSPCArcher, Baylor, Clay, Cooke, Foard, Grayson and 5 more5 hr
Jul 10, 10:56 PM MDTMesoscale DiscussionSPCClay, Cooke, Grayson, Hardeman, Montague, Wichita and 1 more94 min
Jul 11, 1:46 AM MDTMesoscale DiscussionSPCArcher, Baylor, Clay, Collin, Denton, Foard and 6 more29 min
Jul 11, 5:51 PM MDTMesoscale DiscussionSPCAnderson, Bell, Cherokee, Coke, Concho, Coryell and 22 more84 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.