Alert archive / Iowa / Mesoscale Discussions in 2018
Mesoscale Discussion 1382
The Storm Prediction Center issued this mesoscale discussion at Aug 28, 2018, 4:45 PM CDT for 27 counties in Iowa; Doniphan County, Kansas; 22 counties in Missouri. It was in force for 60 min.
The area
The outline as issued.
The facts
- Issued
- Aug 28, 2018, 4:45 PM CDT (21:45 UTC)
- Expired
- Aug 28, 2018, 5:45 PM CDT
- In force
- 60 min
- Issued by
- the Storm Prediction Center
- Chance of a watch
- 80%
All 50 counties
Appanoose County, IA, Cedar County, IA, Clarke County, IA, Davis County, IA, Decatur County, IA, Des Moines County, IA, Henry County, IA, Iowa County, IA, Jefferson County, IA, Johnson County, IA, Keokuk County, IA, Lee County, IA, Louisa County, IA, Lucas County, IA, Mahaska County, IA, Marion County, IA, Monroe County, IA, Muscatine County, IA, Poweshiek County, IA, Ringgold County, IA, Taylor County, IA, Union County, IA, Van Buren County, IA, Wapello County, IA, Warren County, IA, Washington County, IA, Wayne County, IA, Doniphan County, KS, Adair County, MO, Andrew County, MO, Buchanan County, MO, Caldwell County, MO, Clark County, MO, Clinton County, MO, Daviess County, MO, DeKalb County, MO, Gentry County, MO, Grundy County, MO, Harrison County, MO, Holt County, MO, Knox County, MO, Linn County, MO, Livingston County, MO, Mercer County, MO, Nodaway County, MO, Putnam County, MO, Schuyler County, MO, Scotland County, MO, Sullivan County, MO, Worth County, MO
The radar
The Des Moines radar (KDMX), 131 km from the middle of the area, began a volume at 21:44 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 watches that followed
Watches SPC issued over any of the same counties within four hours of this discussion.
The nearest sounding before it
Davenport, (KDVN), launched 12:00Z, 9.8 hours before the alert went out and 243 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
- 955 J/kg
- Mixed-layer CIN
- -230 J/kg
- Mixed-layer LCL
- 1046 m above ground
- 0-6 km bulk shear
- 30 kt
- 0-1 km storm-relative helicity
- 360 m²/s²
- 0-3 km storm-relative helicity
- 487 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 |
|---|---|---|---|---|
| Aug 28, 3:12 AM CDT | Mesoscale Discussion | SPC | Cherokee, Clay, Dickinson, Emmet, Lyon, O'Brien and 3 more | 3 hr |
| Aug 28, 7:50 AM CDT | Mesoscale Discussion | SPC | Allamakee, Black Hawk, Bremer, Butler, Cerro Gordo, Chickasaw and 15 more | 115 min |
| 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, 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 Missouri, 2018Mesoscale Discussions in Kansas, 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.