Alert archive / Iowa / Mesoscale Discussions in 2020
Mesoscale Discussion 837
The Storm Prediction Center issued this mesoscale discussion at Jun 5, 2020, 4:17 AM CDT for 40 counties in Iowa. It was in force for 88 min.
The area
The outline as issued.
The facts
- Issued
- Jun 5, 2020, 4:17 AM CDT (09:17 UTC)
- Expired
- Jun 5, 2020, 5:45 AM CDT
- In force
- 88 min
- Issued by
- the Storm Prediction Center
- Concerning
- Severe thunderstorm watch 256
All 40 counties
Appanoose County, IA, Benton County, IA, Black Hawk County, IA, Boone County, IA, Bremer County, IA, Buchanan County, IA, Butler County, IA, Cedar County, IA, Clarke County, IA, Dallas County, IA, Davis County, IA, Delaware County, IA, Fayette County, IA, Greene County, IA, Grundy County, IA, Guthrie County, IA, Hamilton County, IA, Hardin County, IA, Henry County, IA, Iowa County, IA, Jasper County, IA, Jefferson County, IA, Johnson County, IA, Keokuk County, IA, Linn County, IA, Louisa County, IA, Lucas County, IA, Madison County, IA, Mahaska County, IA, Marion County, IA, Marshall County, IA, Monroe County, IA, Muscatine County, IA, Polk County, IA, Poweshiek County, IA, Story County, IA, Tama County, IA, Wapello County, IA, Warren County, IA, Washington County, IA
The radar
The Des Moines radar (KDMX), 62 km from the middle of the area, began a volume at 09:17 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
Davenport, (KDVN), launched 00:00Z, 9.3 hours before the alert went out and 207 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
- 1495 J/kg
- Mixed-layer CIN
- -4 J/kg
- Mixed-layer LCL
- 1653 m above ground
- 0-6 km bulk shear
- 20 kt
- 0-1 km storm-relative helicity
- -9 m²/s²
- 0-3 km storm-relative helicity
- 36 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.0
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 4, 10:50 PM CDT | Mesoscale Discussion | SPC | Allamakee, Black Hawk, Bremer, Buchanan, Butler, Cerro Gordo and 20 more | 115 min |
| Jun 4, 11:32 PM CDT | Severe Thunderstorm Watch | SPC | Fremont, Mills, Montgomery, Page | 7 hr |
| Jun 5, 1:02 AM CDT | Severe Thunderstorm Watch | SPC | Adair, Allamakee, Appanoose, Audubon, Benton, Black Hawk and 54 more | 6 hr |
| Jun 5, 1:59 AM CDT | Mesoscale Discussion | SPC | Adams, Fremont, Mills, Montgomery, Page, Ringgold and 1 more | 91 min |
| Jun 5, 7:59 AM CDT | Mesoscale Discussion | SPC | Des Moines, Henry, Lee | 91 min |
| Jun 5, 12:26 PM CDT | Mesoscale Discussion | SPC | Clinton, Jackson | 94 min |
Nearby
Mesoscale Discussions in Iowa, 2020Every mesoscale discussion in 2020
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.