Alert archive / Texas / Mesoscale Discussions in 2023

Mesoscale Discussion 2136

September 11, 20236 counties in Oklahoma; 14 counties in Texas

The Storm Prediction Center issued this mesoscale discussion at Sep 11, 2023, 12:54 AM CDT for 6 counties in Oklahoma; 14 counties in Texas. It was in force for 2 hr.

The area

The outline as issued.

The facts

Issued: Sep 11, 2023, 12:54 AM CDT (05:54 UTC)
Expired: Sep 11, 2023, 3:00 AM CDT
In force: 2 hr
Issued by: the Storm Prediction Center
Concerning: Severe thunderstorm watch 681

Counties Beckham County, OK, Greer County, OK, Harmon County, OK, Jackson County, OK, Roger Mills County, OK, Washita County, OK, Childress County, TX, Collingsworth County, TX, Cottle County, TX, Crosby County, TX, Dickens County, TX, Foard County, TX, Garza County, TX, Hall County, TX, Hardeman County, TX, Kent County, TX, King County, TX, Lynn County, TX, Motley County, TX, Wheeler County, TX

The radar

The Altus AFB radar (KFDR), 127 km from the middle of the area, began a volume at 05:54 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

Dodge City, (KDDC), launched 00:00Z, 5.9 hours before the alert went out and 325 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: 19 J/kg
Mixed-layer CIN: -272 J/kg
Mixed-layer LCL: 1503 m above ground
0-6 km bulk shear: 38 kt
0-1 km storm-relative helicity: 167 m²/s²
0-3 km storm-relative helicity: 396 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 1.5

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
Sep 10, 7:40 PM CDT	Mesoscale Discussion	SPC	Beaver, Cimarron, Harmon, Texas	3 hr
Sep 10, 10:52 PM CDT	Mesoscale Discussion	SPC	Armstrong, Briscoe, Carson, Childress, Collingsworth, Cottle and 12 more	113 min
Sep 11, 2:33 PM CDT	Mesoscale Discussion	SPC	Bailey, Borden, Briscoe, Castro, Cochran, Cottle and 19 more	117 min
Sep 11, 3:52 PM CDT	Severe Thunderstorm Watch	SPC	Andrews, Bailey, Baylor, Borden, Callahan, Castro and 41 more	5 hr

Nearby

Mesoscale Discussions in Texas, 2023 Mesoscale Discussions in Oklahoma, 2023 Every mesoscale discussion in 2023

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.