Alert archive / Kansas / Mesoscale Discussions in 2018

Mesoscale Discussion 309

May 1, 20184 states

The Storm Prediction Center issued this mesoscale discussion at May 1, 2018, 7:24 PM CDT for 4 states. It was in force for 2 hr.

The area

The outline as issued.

The facts

Issued
May 1, 2018, 7:24 PM CDT (00:24 UTC)
Expired
May 1, 2018, 9:30 PM CDT
In force
2 hr
Issued by
the Storm Prediction Center
All 61 counties

Adams County, IA, Cass County, IA, Fremont County, IA, Harrison County, IA, Mills County, IA, Montgomery County, IA, Page County, IA, Pottawattamie County, IA, Shelby County, IA, Taylor County, IA, Barber County, KS, Barton County, KS, Brown County, KS, Clay County, KS, Cloud County, KS, Dickinson County, KS, Ellsworth County, KS, Geary County, KS, Harper County, KS, Harvey County, KS, Jackson County, KS, Kingman County, KS, Lincoln County, KS, Marion County, KS, Marshall County, KS, McPherson County, KS, Mitchell County, KS, Morris County, KS, Nemaha County, KS, Ottawa County, KS, Pottawatomie County, KS, Pratt County, KS, Reno County, KS, Republic County, KS, Rice County, KS, Riley County, KS, Saline County, KS, Sedgwick County, KS, Stafford County, KS, Wabaunsee County, KS, Washington County, KS, Atchison County, MO, Holt County, MO, Butler County, NE, Cass County, NE, Douglas County, NE, Fillmore 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, Sarpy County, NE, Saunders County, NE, Seward County, NE, Thayer County, NE, Washington County, NE

The radar

The Topeka radar (KTWX), 82 km from the middle of the area, began a volume at 00:29 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, 0.4 hours before the alert went out and 130 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 00:00Z on 2018-05-02Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 543 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 00:00Z on 2018-05-02The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 213 square meters per square second.19395878Sfc1 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
543 J/kg
Mixed-layer CIN
-73 J/kg
Mixed-layer LCL
1230 m above ground
0-6 km bulk shear
39 kt
0-1 km storm-relative helicity
213 m²/s²
0-3 km storm-relative helicity
334 m²/s²
Significant tornado parameter
0.5
Supercell composite
11.0

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, 7:55 PM CDTMesoscale DiscussionSPCAdair, Allamakee, Audubon, Benton, Black Hawk, Boone and 48 more95 min
May 1, 9:38 PM CDTMesoscale DiscussionSPCAdair, Audubon, Benton, Black Hawk, Boone, Bremer and 29 more67 min
May 2, 1:33 PM CDTMesoscale DiscussionSPCCedar, Clinton, Des Moines, Henry, Jackson, Jefferson and 9 more117 min
May 2, 3:56 PM CDTSevere Thunderstorm WatchSPCCedar, Clinton, Des Moines, Henry, Iowa, Jackson and 10 more9 hr
May 2, 5:08 PM CDTMesoscale DiscussionSPCAdair, Adams, Appanoose, Clarke, Davis, Decatur and 15 more97 min
May 2, 5:27 PM CDTTornado WatchSPCAdams, Appanoose, Clarke, Davis, Decatur, Lucas and 9 more8 hr
May 1, 9:06 PM CDTMesoscale DiscussionSPCAtchison, Barton, Brown, Butler, Chase, Clay and 33 more54 min
May 2, 11:36 AM CDTMesoscale DiscussionSPCBarber, Chase, Clark, Comanche, Dickinson, Edwards and 15 more2 hr
May 2, 12:43 PM CDTTornado WatchSPCAnderson, Barber, Barton, Brown, Butler, Chase and 51 more9 hr
May 2, 2:47 PM CDTMesoscale DiscussionSPCEdwards, Kiowa, McPherson, Rice, Stafford118 min
May 2, 5:18 PM CDTMesoscale DiscussionSPCAtchison, Barber, Brown, Butler, Chase, Clay and 28 more87 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.