Alert archive / Iowa / Mesoscale Discussions in 2007
Mesoscale Discussion 1815
The Storm Prediction Center issued this mesoscale discussion at Aug 20, 2007, 9:34 AM CDT for 27 counties in Iowa; 8 counties in Minnesota; Burt County, Thurston County, Washington County, Nebraska. It was in force for 56 min.
The area
The outline as issued.
The facts
- Issued
- Aug 20, 2007, 9:34 AM CDT (14:34 UTC)
- Expired
- Aug 20, 2007, 10:30 AM CDT
- In force
- 56 min
- Issued by
- the Storm Prediction Center
All 38 counties
Audubon County, IA, Buena Vista County, IA, Calhoun County, IA, Carroll County, IA, Cerro Gordo County, IA, Cherokee County, IA, Clay County, IA, Crawford County, IA, Dickinson County, IA, Emmet County, IA, Greene County, IA, Hancock County, IA, Harrison County, IA, Humboldt County, IA, Ida County, IA, Kossuth County, IA, Monona County, IA, O'Brien County, IA, Palo Alto County, IA, Pocahontas County, IA, Sac County, IA, Shelby County, IA, Webster County, IA, Winnebago County, IA, Woodbury County, IA, Worth County, IA, Wright County, IA, Blue Earth County, MN, Faribault County, MN, Freeborn County, MN, Jackson County, MN, Martin County, MN, Steele County, MN, Waseca County, MN, Watonwan County, MN, Burt County, NE, Thurston County, NE, Washington County, NE
The radar
The Des Moines radar (KDMX), 152 km from the middle of the area, began a volume at 14:33 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, 2.6 hours before the alert went out and 228 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
- 768 J/kg
- Mixed-layer CIN
- -216 J/kg
- Mixed-layer LCL
- 1084 m above ground
- 0-6 km bulk shear
- 30 kt
- 0-1 km storm-relative helicity
- 68 m²/s²
- 0-3 km storm-relative helicity
- 129 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.3
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, 3:03 PM CDT | Mesoscale Discussion | SPC | Cherokee, Crawford, Fremont, Harrison, Ida, Lyon and 8 more | 117 min |
| Aug 20, 3:49 PM CDT | Tornado Watch | SPC | Fremont, Harrison, Mills, Monona, Montgomery, Page and 2 more | 6 hr |
| Aug 20, 6:27 PM CDT | Mesoscale Discussion | SPC | Page | 2 hr |
Nearby
Mesoscale Discussions in Iowa, 2007Mesoscale Discussions in Minnesota, 2007Mesoscale Discussions in Nebraska, 2007Every mesoscale discussion in 2007
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.