Alert archive / Nebraska / Mesoscale Discussions in 2018

Mesoscale Discussion 657

June 6, 20184 states

The Storm Prediction Center issued this mesoscale discussion at Jun 6, 2018, 8:45 PM CDT for 4 states. It was in force for 90 min.

The area

The outline as issued.

The facts

Issued: Jun 6, 2018, 8:45 PM CDT (01:45 UTC)
Expired: Jun 6, 2018, 10:15 PM CDT
In force: 90 min
Issued by: the Storm Prediction Center

All 75 counties

Adair County, IA, Adams County, IA, Appanoose County, IA, Audubon County, IA, Cass County, IA, Clarke County, IA, Crawford County, IA, Decatur County, IA, Fremont County, IA, Guthrie County, IA, Harrison County, IA, Lucas County, IA, Madison County, IA, Mills County, IA, Monona County, IA, Montgomery County, IA, Page County, IA, Pottawattamie County, IA, Ringgold County, IA, Shelby County, IA, Taylor County, IA, Union County, IA, Wayne County, IA, Brown County, KS, Marshall County, KS, Nemaha County, KS, Republic County, KS, Washington County, KS, Andrew County, MO, Atchison County, MO, Gentry County, MO, Grundy County, MO, Harrison County, MO, Holt County, MO, Mercer County, MO, Nodaway County, MO, Putnam County, MO, Sullivan County, MO, Worth County, MO, Adams County, NE, Boone County, NE, Burt County, NE, Butler County, NE, Cass County, NE, Clay County, NE, Colfax County, NE, Dodge County, NE, Douglas County, NE, Fillmore County, NE, Gage County, NE, Greeley County, NE, Hall County, NE, Hamilton County, NE, Howard County, NE, Jefferson County, NE, Johnson County, NE, Lancaster County, NE, Merrick County, NE, Nance County, NE, Nemaha County, NE, Nuckolls County, NE, Otoe County, NE, Pawnee County, NE, Platte County, NE, Polk County, NE, Richardson County, NE, Saline County, NE, Sarpy County, NE, Saunders County, NE, Seward County, NE, Sherman County, NE, Thayer County, NE, Valley County, NE, Washington County, NE, York County, NE

The radar

The Omaha radar (KOAX), 61 km from the middle of the area, began a volume at 01:47 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

Omaha, NE (KOAX), launched 00:00Z, 1.8 hours before the alert went out and 60 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: 2529 J/kg
Mixed-layer CIN: -13 J/kg
Mixed-layer LCL: 2020 m above ground
0-6 km bulk shear: 13 kt
0-1 km storm-relative helicity: 0 m²/s²
0-3 km storm-relative helicity: 38 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.

Issued	Product	Office	Counties	Lasted
Jun 6, 7:59 PM CDT	Mesoscale Discussion	SPC	Cheyenne, Rawlins	2 hr
Jun 6, 11:58 PM CDT	Mesoscale Discussion	SPC	Cheyenne, Decatur, Gove, Graham, Jewell, Mitchell and 10 more	2 hr
Jun 7, 1:58 AM CDT	Mesoscale Discussion	SPC	Barber, Barton, Clark, Cloud, Comanche, Edwards and 31 more	92 min
Jun 7, 2:25 AM CDT	Severe Thunderstorm Watch	SPC	Barber, Barton, Comanche, Edwards, Ellis, Ellsworth and 22 more	5 hr
Jun 7, 4:35 AM CDT	Mesoscale Discussion	SPC	Barber, Cloud, Comanche, Ellsworth, Harper, Harvey and 17 more	85 min

Nearby

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