Alert archive / Texas / Mesoscale Discussions in 2018

Mesoscale Discussion 1542

October 8, 201812 counties in Texas

The Storm Prediction Center issued this mesoscale discussion at Oct 8, 2018, 4:57 PM CDT for 12 counties in Texas. It was in force for 93 min.

The area

The outline as issued.

The facts

Issued: Oct 8, 2018, 4:57 PM CDT (21:57 UTC)
Expired: Oct 8, 2018, 6:30 PM CDT
In force: 93 min
Issued by: the Storm Prediction Center
Chance of a watch: 80%

Counties Brewster County, TX, Crane County, TX, Crockett County, TX, Glasscock County, TX, Irion County, TX, Midland County, TX, Pecos County, TX, Reagan County, TX, Sterling County, TX, Terrell County, TX, Upton County, TX, Val Verde County, TX

The radar

The Midland/Odessa radar (KMAF), 158 km from the middle of the area, began a volume at 21:57 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 watches that followed

Watches SPC issued over any of the same counties within four hours of this discussion.

Severe Thunderstorm Watch 400Oct 8, 5:45 PM CDT

The nearest sounding before it

Midland Regional, TX (KMAF), launched 12:00Z, 10.0 hours before the alert went out and 159 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: 1288 J/kg
Mixed-layer CIN: -73 J/kg
Mixed-layer LCL: 941 m above ground
0-6 km bulk shear: 31 kt
0-1 km storm-relative helicity: 257 m²/s²
0-3 km storm-relative helicity: 322 m²/s²
Significant tornado parameter: 1.3
Supercell composite: 11.1

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
Oct 8, 12:25 PM CDT	Mesoscale Discussion	SPC	Andrews, Borden, Coke, Crane, Crockett, Dawson and 14 more	2 hr
Oct 8, 5:48 PM CDT	Severe Thunderstorm Watch	SPC	Coke, Crane, Crockett, Ector, Edwards, Fisher and 20 more	7 hr

Nearby

Mesoscale Discussions in Texas, 2018 Every mesoscale discussion in 2018

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.