Alert archive / Texas / Mesoscale Discussions in 2017

Mesoscale Discussion 508

April 16, 20176 counties in Texas

The Storm Prediction Center issued this mesoscale discussion at Apr 16, 2017, 6:19 PM CDT for 6 counties in Texas. It was in force for 2 hr.

The area

The outline as issued.

The facts

Issued: Apr 16, 2017, 6:19 PM CDT (23:19 UTC)
Expired: Apr 16, 2017, 8:45 PM CDT
In force: 2 hr
Issued by: the Storm Prediction Center
Chance of a watch: 20%

Counties Andrews County, TX, Ector County, TX, Gaines County, TX, Terry County, TX, Winkler County, TX, Yoakum County, TX

The radar

The Midland/Odessa radar (KMAF), 55 km from the middle of the area, began a volume at 23:20 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

Midland Regional, TX (KMAF), launched 12:00Z, 11.3 hours before the alert went out and 54 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: 1063 J/kg
Mixed-layer CIN: -280 J/kg
Mixed-layer LCL: 1374 m above ground
0-6 km bulk shear: 10 kt
0-1 km storm-relative helicity: 194 m²/s²
0-3 km storm-relative helicity: 210 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.0

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
Apr 15, 7:35 PM CDT	Mesoscale Discussion	SPC	Lipscomb, Ochiltree	85 min
Apr 16, 1:46 PM CDT	Mesoscale Discussion	SPC	Brewster, Crane, Pecos	119 min
Apr 16, 3:02 PM CDT	Mesoscale Discussion	SPC	Briscoe, Childress, Collingsworth, Cottle, Dickens, Donley and 11 more	88 min
Apr 16, 3:37 PM CDT	Severe Thunderstorm Watch	SPC	Briscoe, Castro, Childress, Collingsworth, Cottle, Crosby and 26 more	8 hr
Apr 16, 3:54 PM CDT	Mesoscale Discussion	SPC	Clay, Cooke, Montague, Wichita	96 min

Nearby

Mesoscale Discussions in Texas, 2017 Every mesoscale discussion in 2017

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.