Alert archive / Kansas / Mesoscale Discussions in 2018

Mesoscale Discussion 450

May 18, 20184 states

The Storm Prediction Center issued this mesoscale discussion at May 18, 2018, 1:43 PM MDT for 4 states. It was in force for 2 hr.

The area

The outline as issued.

The facts

Issued: May 18, 2018, 1:43 PM MDT (19:43 UTC)
Expired: May 18, 2018, 3:45 PM MDT
In force: 2 hr
Issued by: the Storm Prediction Center
Chance of a watch: 80%

All 54 counties

Baca County, CO, Bent County, CO, Kiowa County, CO, Prowers County, CO, Clark County, KS, Comanche County, KS, Edwards County, KS, Ellis County, KS, Finney County, KS, Ford County, KS, Gove County, KS, Grant County, KS, Gray County, KS, Greeley County, KS, Hamilton County, KS, Haskell County, KS, Hodgeman County, KS, Kearny County, KS, Kiowa County, KS, Lane County, KS, Logan County, KS, Meade County, KS, Ness County, KS, Pawnee County, KS, Pratt County, KS, Rush County, KS, Scott County, KS, Seward County, KS, Stanton County, KS, Stevens County, KS, Trego County, KS, Wichita County, KS, Beaver County, OK, Beckham County, OK, Dewey County, OK, Ellis County, OK, Greer County, OK, Harmon County, OK, Harper County, OK, Jackson County, OK, Roger Mills County, OK, Woods County, OK, Woodward County, OK, Childress County, TX, Collingsworth County, TX, Cottle County, TX, Donley County, TX, Gray County, TX, Hall County, TX, Hemphill County, TX, Lipscomb County, TX, Ochiltree County, TX, Roberts County, TX, Wheeler County, TX

The radar

The Dodge City radar (KDDC), 147 km from the middle of the area, began a volume at 19:46 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.

The nearest sounding before it

Dodge City, (KDDC), launched 12:00Z, 7.7 hours before the alert went out and 152 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: 415 J/kg
Mixed-layer CIN: -472 J/kg
Mixed-layer LCL: 1324 m above ground
0-6 km bulk shear: 15 kt
0-1 km storm-relative helicity: 86 m²/s²
0-3 km storm-relative helicity: 267 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.9

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 17, 6:47 PM MDT	Mesoscale Discussion	SPC	Logan, Phillips, Sedgwick	58 min
May 17, 9:03 PM MDT	Mesoscale Discussion	SPC	Sedgwick	117 min
May 18, 3:02 PM MDT	Severe Thunderstorm Watch	SPC	Baca, Bent, Cheyenne, Crowley, El Paso, Huerfano and 6 more	7 hr
May 18, 3:06 PM MDT	Mesoscale Discussion	SPC	Adams, Arapahoe, Boulder, Broomfield, Denver, Jefferson and 4 more	114 min
May 18, 5:27 PM MDT	Mesoscale Discussion	SPC	Cheyenne, Decatur, Gove, Graham, Norton, Rawlins and 3 more	63 min
May 18, 2:35 PM MDT	Severe Thunderstorm Watch	SPC	Alfalfa, Beaver, Beckham, Custer, Dewey, Ellis and 11 more	6 hr

Nearby

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