Alert archive / Kansas / Mesoscale Discussions in 2018

Mesoscale Discussion 74

February 20, 201814 counties in Kansas; Alfalfa County, Woods County, Woodward County, Oklahoma

The Storm Prediction Center issued this mesoscale discussion at Feb 20, 2018, 4:21 AM CST for 14 counties in Kansas; Alfalfa County, Woods County, Woodward County, Oklahoma. It was in force for 3 hr.

The area

The outline as issued.

The facts

Issued: Feb 20, 2018, 4:21 AM CST (10:21 UTC)
Expired: Feb 20, 2018, 7:15 AM CST
In force: 3 hr
Issued by: the Storm Prediction Center

Counties Barber County, KS, Chase County, KS, Harper County, KS, Harvey County, KS, Kingman County, KS, Lyon County, KS, Marion County, KS, McPherson County, KS, Morris County, KS, Osage County, KS, Reno County, KS, Sedgwick County, KS, Sumner County, KS, Wabaunsee County, KS, Alfalfa County, OK, Woods County, OK, Woodward County, OK

The radar

The Wichita radar (KICT), 32 km from the middle of the area, began a volume at 10:25 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

Topeka, KS (KFOE), launched 00:00Z, 10.4 hours before the alert went out and 186 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: 2 J/kg
Mixed-layer CIN: 0 J/kg
Mixed-layer LCL: 540 m above ground
0-6 km bulk shear: 76 kt
0-1 km storm-relative helicity: 220 m²/s²
0-3 km storm-relative helicity: 273 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
Feb 20, 9:40 AM CST	Mesoscale Discussion	SPC	Chautauqua, Labette, Montgomery, Neosho, Wilson	4 hr
Feb 20, 8:52 AM CST	Mesoscale Discussion	SPC	Carter, Johnston, Love, Marshall	113 min
Feb 20, 11:11 AM CST	Mesoscale Discussion	SPC	Carter, Jefferson, Love	94 min

Nearby

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.