Alert archive / Texas / Mesoscale Discussions in 2015

Mesoscale Discussion 469

April 26, 2015Union County, New Mexico; 6 counties in Texas

The Storm Prediction Center issued this mesoscale discussion at Apr 26, 2015, 2:18 PM MDT for Union County, New Mexico; 6 counties in Texas. It was in force for 117 min.

The area

The outline as issued.

The facts

Issued: Apr 26, 2015, 2:18 PM MDT (20:18 UTC)
Expired: Apr 26, 2015, 4:15 PM MDT
In force: 117 min
Issued by: the Storm Prediction Center
Chance of a watch: 40%

Counties Union County, NM, Armstrong County, TX, Carson County, TX, Dallam County, TX, Hartley County, TX, Moore County, TX, Potter County, TX

The radar

The Amarillo radar (KAMA), 91 km from the middle of the area, began a volume at 20:21 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

Amarillo Airport, TX (KAMA), launched 12:00Z, 8.3 hours before the alert went out and 92 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: 0 J/kg
Mixed-layer CIN: No buoyant parcel
Mixed-layer LCL: 3374 m above ground
0-6 km bulk shear: 27 kt
0-1 km storm-relative helicity: -41 m²/s²
0-3 km storm-relative helicity: 63 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.0

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
Apr 26, 9:55 AM MDT	Mesoscale Discussion	SPC	Archer, Baylor, Bosque, Brown, Callahan, Clay and 30 more	2 hr
Apr 26, 12:06 PM MDT	Tornado Watch	SPC	Archer, Baylor, Brown, Callahan, Childress, Clay and 27 more	7 hr
Apr 26, 1:04 PM MDT	Mesoscale Discussion	SPC	Collingsworth	2 hr
Apr 26, 1:52 PM MDT	Severe Thunderstorm Watch	SPC	Collingsworth, Donley, Wheeler	5 hr
Apr 26, 1:54 PM MDT	Mesoscale Discussion	SPC	Archer, Baylor, Brown, Callahan, Clay, Coleman and 27 more	2 hr
Apr 26, 3:54 PM MDT	Tornado Watch	SPC	Bell, Bosque, Comanche, Coryell, Dallas, Eastland and 17 more	6 hr
Apr 26, 4:24 PM MDT	Mesoscale Discussion	SPC	Brazoria, Chambers, Fort Bend, Galveston, Harris, Wharton	96 min
Apr 26, 4:39 PM MDT	Tornado Watch	SPC	Brazoria, Fort Bend, Galveston, Harris, Jackson, Matagorda and 1 more	2 hr
Apr 26, 4:51 PM MDT	Mesoscale Discussion	SPC	Brown, Coleman, Comanche, Eastland, Erath, Hamilton	84 min
Apr 26, 5:44 PM MDT	Mesoscale Discussion	SPC	Brown, Coleman, Concho, Kimble, McCulloch, Mason and 2 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.