Alert archive / Texas / Mesoscale Discussions in 2018

Mesoscale Discussion 579

May 30, 20185 states

The Storm Prediction Center issued this mesoscale discussion at May 30, 2018, 5:22 PM MDT for 5 states. It was in force for 113 min.

The area

The outline as issued.

The facts

Issued: May 30, 2018, 5:22 PM MDT (23:22 UTC)
Expired: May 30, 2018, 7:15 PM MDT
In force: 113 min
Issued by: the Storm Prediction Center

All 21 counties

Baca County, CO, Grant County, KS, Haskell County, KS, Meade County, KS, Morton County, KS, Seward County, KS, Stanton County, KS, Stevens County, KS, Union County, NM, Beaver County, OK, Cimarron County, OK, Texas County, OK, Dallam County, TX, Hansford County, TX, Hartley County, TX, Hutchinson County, TX, Lipscomb County, TX, Moore County, TX, Ochiltree County, TX, Roberts County, TX, Sherman County, TX

The radar

The Amarillo radar (KAMA), 174 km from the middle of the area, began a volume at 23:25 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, 11.4 hours before the alert went out and 175 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: 97 J/kg
Mixed-layer CIN: -482 J/kg
Mixed-layer LCL: 1973 m above ground
0-6 km bulk shear: 53 kt
0-1 km storm-relative helicity: 193 m²/s²
0-3 km storm-relative helicity: 221 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
May 30, 1:25 PM MDT	Mesoscale Discussion	SPC	Adams, Arapahoe, Baca, Bent, Cheyenne, Crowley and 14 more	2 hr
May 30, 2:56 PM MDT	Severe Thunderstorm Watch	SPC	Baca, Las Animas	7 hr
May 30, 4:23 PM MDT	Mesoscale Discussion	SPC	Cheyenne, Kiowa, Kit Carson, Lincoln	3 hr
May 29, 8:03 PM MDT	Mesoscale Discussion	SPC	Brown, Butler, Chase, Clay, Dickinson, Geary and 17 more	57 min
May 29, 9:58 PM MDT	Mesoscale Discussion	SPC	Allen, Chautauqua, Cherokee, Cowley, Crawford, Elk and 6 more	92 min
May 29, 8:10 PM MDT	Mesoscale Discussion	SPC	Alfalfa, Beckham, Blaine, Caddo, Canadian, Cleveland and 18 more	2 hr
May 29, 8:32 PM MDT	Severe Thunderstorm Watch	SPC	Alfalfa, Beckham, Blaine, Caddo, Canadian, Carter and 32 more	6 hr

Nearby

Mesoscale Discussions in Texas, 2018 Mesoscale Discussions in Kansas, 2018 Mesoscale Discussions in Oklahoma, 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.