Alert archive / Iowa / Mesoscale Discussions in 2018
Mesoscale Discussion 957
The Storm Prediction Center issued this mesoscale discussion at Jun 30, 2018, 3:40 PM CDT for 4 states. It was in force for 2 hr.
The area
The outline as issued.
The facts
- Issued
- Jun 30, 2018, 3:40 PM CDT (20:40 UTC)
- Expired
- Jun 30, 2018, 5:45 PM CDT
- In force
- 2 hr
- Issued by
- the Storm Prediction Center
All 60 counties
Audubon County, IA, Boone County, IA, Butler County, IA, Calhoun County, IA, Carroll County, IA, Cass County, IA, Cerro Gordo County, IA, Chickasaw County, IA, Crawford County, IA, Floyd County, IA, Franklin County, IA, Greene County, IA, Guthrie County, IA, Hamilton County, IA, Hancock County, IA, Hardin County, IA, Harrison County, IA, Howard County, IA, Humboldt County, IA, Kossuth County, IA, Mills County, IA, Mitchell County, IA, Montgomery County, IA, Pocahontas County, IA, Pottawattamie County, IA, Shelby County, IA, Webster County, IA, Winnebago County, IA, Winneshiek County, IA, Worth County, IA, Wright County, IA, Dodge County, MN, Fillmore County, MN, Freeborn County, MN, Goodhue County, MN, Houston County, MN, Mower County, MN, Olmsted County, MN, Steele County, MN, Wabasha County, MN, Winona County, MN, Cass County, NE, Dodge County, NE, Douglas County, NE, Lancaster County, NE, Otoe County, NE, Sarpy County, NE, Saunders County, NE, Seward County, NE, Washington County, NE, Buffalo County, WI, Chippewa County, WI, Dunn County, WI, Eau Claire County, WI, Jackson County, WI, La Crosse County, WI, Pepin County, WI, Pierce County, WI, Saint Croix County, WI, Trempealeau County, WI
The radar
The Des Moines radar (KDMX), 132 km from the middle of the area, began a volume at 20:43 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
Minneapolis, MN (KMPX), launched 12:00Z, 8.7 hours before the alert went out and 219 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.
- Mixed-layer CAPE
- 2197 J/kg
- Mixed-layer CIN
- -223 J/kg
- Mixed-layer LCL
- 1256 m above ground
- 0-6 km bulk shear
- 32 kt
- 0-1 km storm-relative helicity
- 145 m²/s²
- 0-3 km storm-relative helicity
- 217 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.8
The text
As transmitted.
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</html>SPC that day
Everything else SPC issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Jun 30, 12:40 PM CDT | Mesoscale Discussion | SPC | Buena Vista, Calhoun, Carroll, Cerro Gordo, Cherokee, Chickasaw and 26 more | 3 hr |
| Jun 30, 1:39 PM CDT | Severe Thunderstorm Watch | SPC | Adair, Adams, Allamakee, Audubon, Boone, Bremer and 46 more | 7 hr |
| Jun 30, 4:40 PM CDT | Mesoscale Discussion | SPC | Ringgold, Taylor | 95 min |
| Jun 30, 6:09 PM CDT | Mesoscale Discussion | SPC | Fremont, Mills, Montgomery, Page | 96 min |
| Jun 29, 10:57 PM CDT | Mesoscale Discussion | SPC | Aitkin, Benton, Big Stone, Carlton, Cass, Chippewa and 16 more | 63 min |
| Jun 29, 11:56 PM CDT | Severe Thunderstorm Watch | SPC | Aitkin, Benton, Carlton, Cass, Chippewa, Cook and 19 more | 5 hr |
| Jun 30, 3:21 AM CDT | Mesoscale Discussion | SPC | Aitkin, Carlton, Cook, Itasca, Kanabec, Lake and 2 more | 114 min |
| Jun 29, 9:37 PM CDT | Mesoscale Discussion | SPC | Franklin, Furnas, Gosper, Harlan, Kearney, Phelps and 2 more | 113 min |
| Jun 30, 1:35 AM CDT | Mesoscale Discussion | SPC | Antelope, Arthur, Banner, Blaine, Brown, Garden and 12 more | 85 min |
| Jun 30, 2:03 PM CDT | Mesoscale Discussion | SPC | Arthur, Banner, Box Butte, Cheyenne, Dawes, Deuel and 7 more | 87 min |
| Jun 30, 3:03 PM CDT | Severe Thunderstorm Watch | SPC | Banner, Box Butte, Cheyenne, Dawes, Kimball, Morrill and 2 more | 7 hr |
| Jun 30, 3:11 PM CDT | Mesoscale Discussion | SPC | Adams, Boone, Buffalo, Chase, Clay, Custer and 29 more | 94 min |
| Jun 30, 3:26 PM CDT | Severe Thunderstorm Watch | SPC | Adams, Arthur, Blaine, Buffalo, Chase, Cherry and 39 more | 8 hr |
| Jun 30, 5:40 PM CDT | Mesoscale Discussion | SPC | Banner, Box Butte, Cheyenne, Deuel, Kimball, Morrill and 1 more | 2 hr |
| Jun 30, 6:09 PM CDT | Severe Thunderstorm Watch | SPC | Dundy, Hitchcock, Red Willow | 7 hr |
| Jun 30, 4:23 PM CDT | Mesoscale Discussion | SPC | Adams, Brown, Calumet, Clark, Columbia, Crawford and 34 more | 67 min |
| Jun 30, 4:41 PM CDT | Severe Thunderstorm Watch | SPC | Brown, Calumet, Columbia, Dane, Florence, Forest and 21 more | 6 hr |
Nearby
Mesoscale Discussions in Iowa, 2018Mesoscale Discussions in Minnesota, 2018Mesoscale Discussions in Wisconsin, 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.