Alert archive / Iowa / Mesoscale Discussions in 2018
Mesoscale Discussion 1378
The Storm Prediction Center issued this mesoscale discussion at Aug 28, 2018, 7:50 AM CDT for 21 counties in Iowa; Fillmore County, Houston County, Mower County, Minnesota. It was in force for 115 min.
The area
The outline as issued.
The facts
- Issued
- Aug 28, 2018, 7:50 AM CDT (12:50 UTC)
- Expired
- Aug 28, 2018, 9:45 AM CDT
- In force
- 115 min
- Issued by
- the Storm Prediction Center
- Chance of a watch
- 20%
All 24 counties
Allamakee County, IA, Black Hawk County, IA, Bremer County, IA, Butler County, IA, Cerro Gordo County, IA, Chickasaw County, IA, Clayton County, IA, Fayette County, IA, Floyd County, IA, Franklin County, IA, Grundy County, IA, Hamilton County, IA, Hancock County, IA, Hardin County, IA, Howard County, IA, Humboldt County, IA, Mitchell County, IA, Webster County, IA, Winneshiek County, IA, Worth County, IA, Wright County, IA, Fillmore County, MN, Houston County, MN, Mower County, MN
The radar
The Des Moines radar (KDMX), 144 km from the middle of the area, began a volume at 12:49 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, 0.8 hours before the alert went out and 213 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
- 0 J/kg
- Mixed-layer CIN
- No buoyant parcel
- Mixed-layer LCL
- 702 m above ground
- 0-6 km bulk shear
- 53 kt
- 0-1 km storm-relative helicity
- 7 m²/s²
- 0-3 km storm-relative helicity
- -11 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 |
|---|---|---|---|---|
| Aug 28, 3:12 AM CDT | Mesoscale Discussion | SPC | Cherokee, Clay, Dickinson, Emmet, Lyon, O'Brien and 3 more | 3 hr |
| Aug 28, 12:14 PM CDT | Mesoscale Discussion | SPC | Allamakee, Benton, Black Hawk, Boone, Bremer, Buchanan and 21 more | 2 hr |
| Aug 28, 1:14 PM CDT | Severe Thunderstorm Watch | SPC | Allamakee, Black Hawk, Bremer, Buchanan, Butler, Cerro Gordo and 18 more | 8 hr |
| Aug 28, 4:45 PM CDT | Mesoscale Discussion | SPC | Appanoose, Cedar, Clarke, Davis, Decatur, Des Moines and 21 more | 60 min |
| Aug 28, 5:06 PM CDT | Severe Thunderstorm Watch | SPC | Appanoose, Benton, Cedar, Clinton, Davis, Des Moines and 20 more | 6 hr |
| Aug 28, 6:07 PM CDT | Mesoscale Discussion | SPC | Cedar, Iowa, Johnson, Keokuk, Muscatine, Washington | 53 min |
Nearby
Mesoscale Discussions in Iowa, 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.