Alert archive / Kansas / Mesoscale Discussions in 2015

Mesoscale Discussion 1775

September 7, 20154 states

The Storm Prediction Center issued this mesoscale discussion at Sep 7, 2015, 8:38 PM CDT for 4 states. It was in force for 67 min.

The area

The outline as issued.

The facts

Issued: Sep 7, 2015, 8:38 PM CDT (01:38 UTC)
Expired: Sep 7, 2015, 9:45 PM CDT
In force: 67 min
Issued by: the Storm Prediction Center

All 32 counties

Fremont County, IA, Butler County, KS, Chase County, KS, Clay County, KS, Coffey County, KS, Dickinson County, KS, Geary County, KS, Greenwood County, KS, Jackson County, KS, Lyon County, KS, Marshall County, KS, Morris County, KS, Nemaha County, KS, Osage County, KS, Pottawatomie County, KS, Riley County, KS, Sedgwick County, KS, Shawnee County, KS, Wabaunsee County, KS, Washington County, KS, Woodson County, KS, Atchison County, MO, Cass County, NE, Gage County, NE, Jefferson County, NE, Johnson County, NE, Lancaster County, NE, Nemaha County, NE, Otoe County, NE, Pawnee County, NE, Richardson County, NE, Saline County, NE

The radar

The Topeka radar (KTWX), 39 km from the middle of the area, began a volume at 01:39 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, 1.6 hours before the alert went out and 90 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: 1383 J/kg
Mixed-layer CIN: -203 J/kg
Mixed-layer LCL: 1372 m above ground
0-6 km bulk shear: 30 kt
0-1 km storm-relative helicity: 146 m²/s²
0-3 km storm-relative helicity: 275 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 4.2

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
Sep 8, 3:46 PM CDT	Mesoscale Discussion	SPC	Butler, Chautauqua, Cowley, Elk, Greenwood, Sedgwick and 1 more	89 min
Sep 8, 9:52 AM CDT	Mesoscale Discussion	SPC	Lewis, Marion	113 min
Sep 8, 1:48 PM CDT	Mesoscale Discussion	SPC	Barry, McDonald, Newton	2 hr

Nearby

Mesoscale Discussions in Kansas, 2015 Mesoscale Discussions in Nebraska, 2015 Mesoscale Discussions in Iowa, 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.