Alert archive / Iowa / Mesoscale Discussions in 2018
Mesoscale Discussion 1359
The Storm Prediction Center issued this mesoscale discussion at Aug 26, 2018, 9:53 AM CDT for 4 states. It was in force for 2 hr.
The area
The outline as issued.
The facts
- Issued
- Aug 26, 2018, 9:53 AM CDT (14:53 UTC)
- Expired
- Aug 26, 2018, 12:00 PM CDT
- In force
- 2 hr
- Issued by
- the Storm Prediction Center
- Chance of a watch
- 20%
All 54 counties
Adair County, IA, Adams County, IA, Audubon County, IA, Boone County, IA, Buena Vista County, IA, Calhoun County, IA, Carroll County, IA, Cass County, IA, Cherokee County, IA, Clarke County, IA, Clay County, IA, Crawford County, IA, Dallas County, IA, Dickinson County, IA, Emmet County, IA, Greene County, IA, Guthrie County, IA, Hamilton County, IA, Hardin County, IA, Harrison County, IA, Humboldt County, IA, Ida County, IA, Jasper County, IA, Lucas County, IA, Lyon County, IA, Madison County, IA, Marion County, IA, Marshall County, IA, Monona County, IA, O'Brien County, IA, Osceola County, IA, Palo Alto County, IA, Plymouth County, IA, Pocahontas County, IA, Polk County, IA, Pottawattamie County, IA, Sac County, IA, Shelby County, IA, Sioux County, IA, Story County, IA, Tama County, IA, Union County, IA, Warren County, IA, Webster County, IA, Woodbury County, IA, Wright County, IA, Jackson County, MN, Nobles County, MN, Burt County, NE, Dakota County, NE, Dixon County, NE, Thurston County, NE, Lincoln County, SD, Union County, SD
The radar
The Des Moines radar (KDMX), 107 km from the middle of the area, began a volume at 14:53 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, 2.9 hours before the alert went out and 140 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
- 1780 J/kg
- Mixed-layer CIN
- -238 J/kg
- Mixed-layer LCL
- 1124 m above ground
- 0-6 km bulk shear
- 19 kt
- 0-1 km storm-relative helicity
- 217 m²/s²
- 0-3 km storm-relative helicity
- 130 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.4
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 |
|---|---|---|---|---|
| Aug 25, 10:08 PM CDT | Mesoscale Discussion | SPC | Becker, Clay, Douglas, Mahnomen, Norman, Otter Tail and 2 more | 97 min |
| Aug 26, 2:46 AM CDT | Mesoscale Discussion | SPC | Becker, Benton, Clay, Crow Wing, Douglas, Kanabec and 6 more | 2 hr |
| Aug 26, 11:56 AM CDT | Mesoscale Discussion | SPC | Becker, Cass, Clay, Crow Wing, Douglas, Grant and 6 more | 109 min |
| Aug 26, 1:42 PM CDT | Mesoscale Discussion | SPC | Big Stone, Grant, Lac qui Parle, Stevens, Traverse | 3 hr |
| Aug 26, 5:14 PM CDT | Mesoscale Discussion | SPC | Aitkin, Carlton, Cass, Crow Wing | 2 hr |
| Aug 26, 6:15 PM CDT | Mesoscale Discussion | SPC | Becker, Beltrami, Clay, Clearwater, Grant, Hubbard and 10 more | 3 hr |
| Aug 26, 5:42 AM CDT | Mesoscale Discussion | SPC | Brown, Campbell, Corson, McPherson, Walworth | 3 hr |
Nearby
Mesoscale Discussions in Iowa, 2018Mesoscale Discussions in Nebraska, 2018Mesoscale Discussions in Minnesota, 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.