Alert archive / Nebraska / Mesoscale Discussions in 2018

Mesoscale Discussion 963

June 30, 20184 counties in Iowa; 4 counties in Missouri; 52 counties in Nebraska

The Storm Prediction Center issued this mesoscale discussion at Jun 30, 2018, 6:09 PM CDT for 4 counties in Iowa; 4 counties in Missouri; 52 counties in Nebraska. It was in force for 96 min.

The area

The outline as issued.

The facts

Issued
Jun 30, 2018, 6:09 PM CDT (23:09 UTC)
Expired
Jun 30, 2018, 7:45 PM CDT
In force
96 min
Issued by
the Storm Prediction Center
All 60 counties

Fremont County, IA, Mills County, IA, Montgomery County, IA, Page County, IA, Andrew County, MO, Atchison County, MO, Holt County, MO, Nodaway County, MO, Adams County, NE, Arthur County, NE, Blaine County, NE, Buffalo County, NE, Butler County, NE, Cass County, NE, Clay County, NE, Custer County, NE, Dawson County, NE, Deuel County, NE, Fillmore County, NE, Franklin County, NE, Frontier County, NE, Gage County, NE, Garden County, NE, Gosper County, NE, Grant County, NE, Greeley County, NE, Hall County, NE, Hamilton County, NE, Harlan County, NE, Hooker County, NE, Howard County, NE, Jefferson County, NE, Johnson County, NE, Kearney County, NE, Keith County, NE, Lancaster County, NE, Lincoln County, NE, Logan County, NE, Loup County, NE, McPherson County, NE, Merrick County, NE, Nance County, NE, Nemaha County, NE, Nuckolls County, NE, Otoe County, NE, Pawnee County, NE, Perkins County, NE, Phelps 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, Thomas County, NE, Valley County, NE, Webster County, NE, York County, NE

The radar

The Grand Island radar (KUEX), 73 km from the middle of the area, began a volume at 23:12 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 12:00Z, 11.2 hours before the alert went out and 175 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, Omaha, NE at 12:00Z on 2018-06-30Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 2420 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, Omaha, NE at 12:00Z on 2018-06-30The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity -36 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
2420 J/kg
Mixed-layer CIN
-83 J/kg
Mixed-layer LCL
962 m above ground
0-6 km bulk shear
41 kt
0-1 km storm-relative helicity
-36 m²/s²
0-3 km storm-relative helicity
-9 m²/s²
Significant tornado parameter
-0.1
Supercell composite
-0.2

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
Jun 30, 12:40 PM CDTMesoscale DiscussionSPCBuena Vista, Calhoun, Carroll, Cerro Gordo, Cherokee, Chickasaw and 26 more3 hr
Jun 30, 1:39 PM CDTSevere Thunderstorm WatchSPCAdair, Adams, Allamakee, Audubon, Boone, Bremer and 46 more7 hr
Jun 30, 3:40 PM CDTMesoscale DiscussionSPCAudubon, Boone, Butler, Calhoun, Carroll, Cass and 25 more2 hr
Jun 30, 4:40 PM CDTMesoscale DiscussionSPCRinggold, Taylor95 min
Jun 30, 4:57 PM CDTSevere Thunderstorm WatchSPCAndrew, Atchison, Buchanan, Caldwell, Clay, Clinton and 9 more6 hr
Jun 29, 9:37 PM CDTMesoscale DiscussionSPCFranklin, Furnas, Gosper, Harlan, Kearney, Phelps and 2 more113 min
Jun 30, 1:35 AM CDTMesoscale DiscussionSPCAntelope, Arthur, Banner, Blaine, Brown, Garden and 12 more85 min
Jun 30, 2:03 PM CDTMesoscale DiscussionSPCArthur, Banner, Box Butte, Cheyenne, Dawes, Deuel and 7 more87 min
Jun 30, 3:03 PM CDTSevere Thunderstorm WatchSPCBanner, Box Butte, Cheyenne, Dawes, Kimball, Morrill and 2 more7 hr
Jun 30, 3:11 PM CDTMesoscale DiscussionSPCAdams, Boone, Buffalo, Chase, Clay, Custer and 29 more94 min
Jun 30, 3:26 PM CDTSevere Thunderstorm WatchSPCAdams, Arthur, Blaine, Buffalo, Chase, Cherry and 39 more8 hr
Jun 30, 5:40 PM CDTMesoscale DiscussionSPCBanner, Box Butte, Cheyenne, Deuel, Kimball, Morrill and 1 more2 hr
Jun 30, 6:09 PM CDTSevere Thunderstorm WatchSPCDundy, Hitchcock, Red Willow7 hr

Nearby

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