Alert archive / Kansas / Mesoscale Discussions in 2018

Mesoscale Discussion 307

May 1, 20184 states

The Storm Prediction Center issued this mesoscale discussion at May 1, 2018, 5:00 PM CDT for 4 states. It was in force for 2 hr.

The area

The outline as issued.

The facts

Issued
May 1, 2018, 5:00 PM CDT (22:00 UTC)
Expired
May 1, 2018, 7:00 PM CDT
In force
2 hr
Issued by
the Storm Prediction Center
All 65 counties

Cass County, IA, Fremont County, IA, Mills County, IA, Montgomery County, IA, Page County, IA, Pottawattamie County, IA, Barber County, KS, Barton County, KS, Butler County, KS, Chase County, KS, Clay County, KS, Cloud County, KS, Dickinson County, KS, Edwards County, KS, Ellsworth County, KS, Geary County, KS, Harper County, KS, Harvey County, KS, Jewell County, KS, Kingman County, KS, Kiowa County, KS, Lincoln County, KS, Marion County, KS, Marshall County, KS, McPherson County, KS, Mitchell County, KS, Morris County, KS, Nemaha County, KS, Osborne County, KS, Ottawa County, KS, Pawnee County, KS, Pottawatomie County, KS, Pratt County, KS, Reno County, KS, Republic County, KS, Rice County, KS, Riley County, KS, Rush County, KS, Russell County, KS, Saline County, KS, Sedgwick County, KS, Smith County, KS, Stafford County, KS, Wabaunsee County, KS, Washington County, KS, Atchison County, MO, Cass County, NE, Clay County, NE, Douglas County, NE, Fillmore County, NE, Gage County, NE, Jefferson County, NE, Johnson County, NE, Lancaster County, NE, Nemaha County, NE, Nuckolls County, NE, Otoe County, NE, Pawnee County, NE, Richardson County, NE, Saline County, NE, Sarpy County, NE, Saunders County, NE, Seward County, NE, Thayer County, NE, Webster County, NE

The radar

The Topeka radar (KTWX), 119 km from the middle of the area, began a volume at 22:00 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 watches that followed

Watches SPC issued over any of the same counties within four hours of this discussion.

The nearest sounding before it

Topeka, KS (KFOE), launched 12:00Z, 10.0 hours before the alert went out and 170 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-pSkew-T log-p diagram, Topeka, KS at 12:00Z on 2018-05-01Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 9 joules per kilogram.LCLLFCEL10008507005003002001001 km2 km3 km6 km9 km12 km15 km-30°-20°-10°0°10°20°30°40°
Temperature in red, dew point in green, the mixed-layer parcel dashed.
HodographHodograph, Topeka, KS at 12:00Z on 2018-05-01The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 215 square meters per square second.193958Sfc1 km3 km6 km9 kmRMLM
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
9 J/kg
Mixed-layer CIN
-558 J/kg
Mixed-layer LCL
1172 m above ground
0-6 km bulk shear
23 kt
0-1 km storm-relative helicity
215 m²/s²
0-3 km storm-relative helicity
193 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.

IssuedProductOfficeCountiesLasted
May 1, 10:24 AM CDTMesoscale DiscussionSPCAppanoose, Clarke, Decatur, Jasper, Lucas, Madison and 10 more3 hr
May 1, 2:47 PM CDTTornado WatchSPCHarrison, Monona, Pottawattamie, Shelby9 hr
May 1, 3:16 PM CDTMesoscale DiscussionSPCAudubon, Black Hawk, Boone, Bremer, Buena Vista, Butler and 24 more89 min
May 1, 5:47 PM CDTSevere Thunderstorm WatchSPCAdair, Allamakee, Audubon, Benton, Black Hawk, Boone and 44 more6 hr
Apr 30, 7:39 PM CDTMesoscale DiscussionSPCClark, Finney, Ford, Gove, Gray, Hodgeman and 3 more2 hr
May 1, 1:10 PM CDTMesoscale DiscussionSPCBarton, Clay, Cloud, Dickinson, Edwards, Ellis and 23 more3 hr
Apr 30, 8:13 PM CDTMesoscale DiscussionSPCAntelope, Boone, Cedar, Custer, Garfield, Greeley and 10 more92 min
May 1, 2:01 PM CDTMesoscale DiscussionSPCCheyenne, Kimball119 min

Nearby

Mesoscale Discussions in Kansas, 2018Mesoscale Discussions in Nebraska, 2018Mesoscale Discussions in Iowa, 2018Every 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.