Alert archive / Kansas / Mesoscale Discussions in 2018

Mesoscale Discussion 304

May 1, 201829 counties in Kansas; 19 counties in Nebraska

The Storm Prediction Center issued this mesoscale discussion at May 1, 2018, 1:10 PM CDT for 29 counties in Kansas; 19 counties in Nebraska. It was in force for 3 hr.

The area

The outline as issued.

The facts

Issued: May 1, 2018, 1:10 PM CDT (18:10 UTC)
Expired: May 1, 2018, 3:45 PM CDT
In force: 3 hr
Issued by: the Storm Prediction Center
Chance of a watch: 95%

All 48 counties

Barton County, KS, Clay County, KS, Cloud County, KS, Dickinson County, KS, Edwards County, KS, Ellis County, KS, Ellsworth County, KS, Ford County, KS, Hodgeman County, KS, Jewell County, KS, Kiowa County, KS, Lincoln County, KS, Marshall County, KS, McPherson County, KS, Mitchell County, KS, Osborne County, KS, Ottawa County, KS, Pawnee County, KS, Pratt County, KS, Republic County, KS, Rice County, KS, Riley County, KS, Rooks County, KS, Rush County, KS, Russell County, KS, Saline County, KS, Smith County, KS, Stafford County, KS, Washington County, KS, Butler County, NE, Cass County, NE, Clay County, NE, Douglas County, NE, Fillmore County, NE, Gage County, NE, Jefferson County, NE, Johnson County, NE, Lancaster County, NE, Nuckolls County, NE, Otoe County, NE, Pawnee County, NE, Saline County, NE, Sarpy County, NE, Saunders County, NE, Seward County, NE, Thayer County, NE, Webster County, NE, York County, NE

The radar

The Grand Island radar (KUEX), 134 km from the middle of the area, began a volume at 18:11 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.

Tornado Watch 59May 1, 2:45 PM CDT

The nearest sounding before it

Dodge City, (KDDC), launched 12:00Z, 6.2 hours before the alert went out and 214 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: 1353 J/kg
Mixed-layer CIN: -253 J/kg
Mixed-layer LCL: 970 m above ground
0-6 km bulk shear: 43 kt
0-1 km storm-relative helicity: 376 m²/s²
0-3 km storm-relative helicity: 354 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.8

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
Apr 30, 7:39 PM CDT	Mesoscale Discussion	SPC	Clark, Finney, Ford, Gove, Gray, Hodgeman and 3 more	2 hr
May 1, 2:47 PM CDT	Tornado Watch	SPC	Barber, Barton, Clark, Clay, Cloud, Comanche and 36 more	9 hr
May 1, 5:00 PM CDT	Mesoscale Discussion	SPC	Barber, Barton, Butler, Chase, Clay, Cloud and 33 more	2 hr
Apr 30, 8:13 PM CDT	Mesoscale Discussion	SPC	Antelope, Boone, Cedar, Custer, Garfield, Greeley and 10 more	92 min
May 1, 2:01 PM CDT	Mesoscale Discussion	SPC	Cheyenne, Kimball	119 min

Nearby

Mesoscale Discussions in Kansas, 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.