Alert archive / Texas / Mesoscale Discussions in 2015

Mesoscale Discussion 691

May 18, 2015Eddy County, Lea County, New Mexico; 14 counties in Texas

The Storm Prediction Center issued this mesoscale discussion at May 18, 2015, 5:00 PM MDT for Eddy County, Lea County, New Mexico; 14 counties in Texas. It was in force for 2 hr.

The area

The outline as issued.

The facts

Issued: May 18, 2015, 5:00 PM MDT (23:00 UTC)
Expired: May 18, 2015, 7:00 PM MDT
In force: 2 hr
Issued by: the Storm Prediction Center

Counties Eddy County, NM, Lea County, NM, Andrews County, TX, Brewster County, TX, Crane County, TX, Ector County, TX, Gaines County, TX, Jeff Davis County, TX, Loving County, TX, Midland County, TX, Pecos County, TX, Reeves County, TX, Terrell County, TX, Upton County, TX, Ward County, TX, Winkler County, TX

The radar

The Midland/Odessa radar (KMAF), 146 km from the middle of the area, began a volume at 23:00 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, 11.0 hours before the alert went out and 145 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: 290 J/kg
Mixed-layer CIN: -219 J/kg
Mixed-layer LCL: 1231 m above ground
0-6 km bulk shear: 25 kt
0-1 km storm-relative helicity: 28 m²/s²
0-3 km storm-relative helicity: -9 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.1

Open this sounding in Storm Lab

The text

As transmitted, in the capitals the NWS used until 2016.

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SPC that day

Everything else SPC issued on the same UTC day.

Issued	Product	Office	Counties	Lasted
May 18, 1:36 PM MDT	Severe Thunderstorm Watch	SPC	Eddy, Lea	7 hr
May 18, 12:07 PM MDT	Mesoscale Discussion	SPC	Clay, Montague, Wichita	53 min
May 18, 1:16 PM MDT	Mesoscale Discussion	SPC	Andrews, Brewster, Crane, Ector, Jeff Davis, Loving and 8 more	59 min
May 18, 1:58 PM MDT	Mesoscale Discussion	SPC	Archer, Bell, Blanco, Bosque, Brown, Burnet and 33 more	2 hr

Nearby

Mesoscale Discussions in Texas, 2015 Mesoscale Discussions in New Mexico, 2015 Every mesoscale discussion in 2015

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.