Alert archive / Kansas / Mesoscale Discussions in 2018

Mesoscale Discussion 405

May 13, 201828 counties in Kansas; 9 counties in Missouri; 8 counties in Nebraska

The Storm Prediction Center issued this mesoscale discussion at May 13, 2018, 8:00 PM CDT for 28 counties in Kansas; 9 counties in Missouri; 8 counties in Nebraska. It was in force for 3 hr.

The area

The outline as issued.

The facts

Issued: May 13, 2018, 8:00 PM CDT (01:00 UTC)
Expired: May 13, 2018, 10:30 PM CDT
In force: 3 hr
Issued by: the Storm Prediction Center
Chance of a watch: 20%

All 45 counties

Atchison County, KS, Brown County, KS, Clay County, KS, Cloud County, KS, Dickinson County, KS, Doniphan County, KS, Geary County, KS, Jackson County, KS, Jefferson County, KS, Jewell County, KS, Leavenworth County, KS, Lincoln County, KS, Marshall County, KS, Mitchell County, KS, Nemaha County, KS, Osborne County, KS, Ottawa County, KS, Phillips County, KS, Pottawatomie County, KS, Republic County, KS, Riley County, KS, Rooks County, KS, Russell County, KS, Saline County, KS, Shawnee County, KS, Smith County, KS, Wabaunsee County, KS, Washington County, KS, Andrew County, MO, Atchison County, MO, Buchanan County, MO, Clinton County, MO, DeKalb County, MO, Gentry County, MO, Holt County, MO, Nodaway County, MO, Platte County, MO, Gage County, NE, Jefferson County, NE, Johnson County, NE, Nemaha County, NE, Nuckolls County, NE, Pawnee County, NE, Richardson County, NE, Thayer County, NE

The radar

The Topeka radar (KTWX), 89 km from the middle of the area, began a volume at 01:00 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, 1.0 hours before the alert went out and 129 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: 2388 J/kg
Mixed-layer CIN: -49 J/kg
Mixed-layer LCL: 1839 m above ground
0-6 km bulk shear: 22 kt
0-1 km storm-relative helicity: 43 m²/s²
0-3 km storm-relative helicity: 146 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 3.7

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 13, 7:14 PM CDT	Mesoscale Discussion	SPC	Barber, Barton, Clark, Comanche, Edwards, Ford and 7 more	91 min
May 14, 12:54 PM CDT	Mesoscale Discussion	SPC	Allen, Anderson, Bourbon, Butler, Chase, Coffey and 13 more	96 min
May 14, 1:20 PM CDT	Severe Thunderstorm Watch	SPC	Allen, Anderson, Bourbon, Butler, Chase, Chautauqua and 28 more	11 hr
May 14, 5:04 PM CDT	Mesoscale Discussion	SPC	Logan, Sherman, Wallace	116 min
May 14, 6:36 PM CDT	Mesoscale Discussion	SPC	Saint Charles, Saint Louis, City of Saint Louis	84 min

Nearby

Mesoscale Discussions in Kansas, 2018 Mesoscale Discussions in Missouri, 2018 Mesoscale Discussions in Nebraska, 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.