Alert archive / Iowa / Mesoscale Discussions in 2014
Mesoscale Discussion 1585
The Storm Prediction Center issued this mesoscale discussion at Aug 20, 2014, 2:40 AM CDT for 23 counties in Iowa; 20 counties in Nebraska; 7 counties in South Dakota. It was in force for 2 hr.
The area
The outline as issued.
The facts
- Issued
- Aug 20, 2014, 2:40 AM CDT (07:40 UTC)
- Expired
- Aug 20, 2014, 4:45 AM CDT
- In force
- 2 hr
- Issued by
- the Storm Prediction Center
- Chance of a watch
- 20%
All 50 counties
Adair County, IA, Adams County, IA, Audubon County, IA, Carroll County, IA, Cass County, IA, Clarke County, IA, Crawford County, IA, Decatur County, IA, Greene County, IA, Guthrie County, IA, Harrison County, IA, Ida County, IA, Madison County, IA, Mills County, IA, Monona County, IA, Montgomery County, IA, Plymouth County, IA, Pottawattamie County, IA, Ringgold County, IA, Sac County, IA, Shelby County, IA, Union County, IA, Woodbury County, IA, Antelope County, NE, Boone County, NE, Burt County, NE, Cedar County, NE, Colfax County, NE, Cuming County, NE, Dakota County, NE, Dixon County, NE, Dodge County, NE, Douglas County, NE, Knox County, NE, Madison County, NE, Pierce County, NE, Platte County, NE, Sarpy County, NE, Saunders County, NE, Stanton County, NE, Thurston County, NE, Washington County, NE, Wayne County, NE, Bon Homme County, SD, Charles Mix County, SD, Clay County, SD, Douglas County, SD, Hutchinson County, SD, Union County, SD, Yankton County, SD
The radar
The Omaha radar (KOAX), 114 km from the middle of the area, began a volume at 07:40 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 00:00Z, 7.7 hours before the alert went out and 114 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
- 667 J/kg
- Mixed-layer CIN
- -206 J/kg
- Mixed-layer LCL
- 1983 m above ground
- 0-6 km bulk shear
- 41 kt
- 0-1 km storm-relative helicity
- 29 m²/s²
- 0-3 km storm-relative helicity
- 173 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.5
The text
As transmitted, in the capitals the NWS used until 2016.
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</html>SPC that day
Everything else SPC issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Aug 20, 3:42 PM CDT | Mesoscale Discussion | SPC | Campbell, Corson, Dewey, Edmunds, Perkins, Potter and 4 more | 2 hr |
| Aug 20, 5:00 PM CDT | Severe Thunderstorm Watch | SPC | Campbell, Corson, Dewey, Edmunds, Faulk, Haakon and 10 more | 7 hr |
Nearby
Mesoscale Discussions in Iowa, 2014Mesoscale Discussions in Nebraska, 2014Mesoscale Discussions in South Dakota, 2014Every mesoscale discussion in 2014
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.