Alert archive / Texas / Mesoscale Discussions in 2026

Mesoscale Discussion 810

May 20, 2026Crockett County, Terrell County, Texas

The Storm Prediction Center issued this mesoscale discussion at May 20, 2026, 6:35 PM CDT for Crockett County, Terrell County, Texas. It was in force for 115 min.

The area

The outline as issued.

The facts

Issued: May 20, 2026, 6:35 PM CDT (23:35 UTC)
Expired: May 20, 2026, 8:30 PM CDT
In force: 115 min
Issued by: the Storm Prediction Center
Concerning: Severe thunderstorm watch 237

Counties Crockett County, TX, Terrell County, TX

The radar

The Midland/Odessa radar (KMAF), 151 km from the middle of the area, began a volume at 23:36 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.

The nearest sounding before it

Del Rio, TX (KDRT), launched 12:00Z, 11.6 hours before the alert went out and 170 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-p

Temperature in red, dew point in green, the mixed-layer parcel dashed.

Hodograph

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: 52 J/kg
Mixed-layer CIN: -811 J/kg
Mixed-layer LCL: 843 m above ground
0-6 km bulk shear: 24 kt
0-1 km storm-relative helicity: -56 m²/s²
0-3 km storm-relative helicity: 39 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.3

Open this sounding in Storm Lab

The text

As transmitted.

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SPC that day

Everything else SPC issued on the same UTC day.

Issued	Product	Office	Counties	Lasted
May 19, 8:33 PM CDT	Mesoscale Discussion	SPC	Bandera, Bastrop, Bexar, Blanco, Caldwell, Comal and 13 more	2 hr
May 19, 11:50 PM CDT	Mesoscale Discussion	SPC	Atascosa, Austin, Bexar, Brazoria, Burleson, Caldwell and 25 more	85 min
May 20, 2:53 PM CDT	Mesoscale Discussion	SPC	Brewster, Crane, Crockett, Ector, Glasscock, Jeff Davis and 9 more	2 hr
May 20, 3:14 PM CDT	Severe Thunderstorm Watch	SPC	Brewster, Jeff Davis, Pecos, Presidio, Terrell	6 hr

Nearby

Mesoscale Discussions in Texas, 2026 Every mesoscale discussion in 2026

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.