Alert archive / Kansas / Mesoscale Discussions in 2018

Mesoscale Discussion 1106

July 20, 20184 counties in Colorado; 26 counties in Kansas

The Storm Prediction Center issued this mesoscale discussion at Jul 20, 2018, 4:15 PM MDT for 4 counties in Colorado; 26 counties in Kansas. It was in force for 3 hr.

The area

The outline as issued.

The facts

Issued: Jul 20, 2018, 4:15 PM MDT (22:15 UTC)
Expired: Jul 20, 2018, 6:45 PM MDT
In force: 3 hr
Issued by: the Storm Prediction Center
Chance of a watch: 20%

All 30 counties

Bent County, CO, Cheyenne County, CO, Kiowa County, CO, Prowers County, CO, Barber County, KS, Barton County, KS, Edwards County, KS, Finney County, KS, Ford County, KS, Gove County, KS, Gray County, KS, Greeley County, KS, Hamilton County, KS, Harper County, KS, Haskell County, KS, Hodgeman County, KS, Kearny County, KS, Kingman County, KS, Kiowa County, KS, Lane County, KS, Logan County, KS, Ness County, KS, Pawnee County, KS, Pratt County, KS, Reno County, KS, Rush County, KS, Scott County, KS, Stafford County, KS, Wallace County, KS, Wichita County, KS

The radar

The Dodge City radar (KDDC), 41 km from the middle of the area, began a volume at 22:17 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

Dodge City, (KDDC), launched 12:00Z, 10.3 hours before the alert went out and 43 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: 1083 J/kg
Mixed-layer CIN: -381 J/kg
Mixed-layer LCL: 2101 m above ground
0-6 km bulk shear: 24 kt
0-1 km storm-relative helicity: 78 m²/s²
0-3 km storm-relative helicity: 110 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.1

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
Jul 20, 8:25 AM MDT	Mesoscale Discussion	SPC	Norton, Phillips, Smith	95 min

Nearby

Mesoscale Discussions in Kansas, 2018 Mesoscale Discussions in Colorado, 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.