Alert archive / Iowa / Mesoscale Discussions in 2013
Mesoscale Discussion 1697
The Storm Prediction Center issued this mesoscale discussion at Aug 11, 2013, 5:00 PM CDT for 32 counties in Iowa; Burt County, Thurston County, Nebraska. It was in force for 60 min.
The area
The outline as issued.
The facts
- Issued
- Aug 11, 2013, 5:00 PM CDT (22:00 UTC)
- Expired
- Aug 11, 2013, 6:00 PM CDT
- In force
- 60 min
- Issued by
- the Storm Prediction Center
- Chance of a watch
- 20%
All 34 counties
Black Hawk County, IA, Bremer County, IA, Buena Vista County, IA, Butler County, IA, Calhoun County, IA, Carroll County, IA, Cerro Gordo County, IA, Cherokee County, IA, Chickasaw County, IA, Crawford County, IA, Fayette County, IA, Floyd County, IA, Franklin County, IA, Greene County, IA, Grundy County, IA, Hamilton County, IA, Hancock County, IA, Hardin County, IA, Harrison County, IA, Humboldt County, IA, Ida County, IA, Kossuth County, IA, Mitchell County, IA, Monona County, IA, Palo Alto County, IA, Pocahontas County, IA, Sac County, IA, Webster County, IA, Winneshiek County, IA, Woodbury County, IA, Worth County, IA, Wright County, IA, Burt County, NE, Thurston County, NE
The radar
The Des Moines radar (KDMX), 118 km from the middle of the area, began a volume at 22:00 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, 10.0 hours before the alert went out and 248 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
- 30 J/kg
- Mixed-layer CIN
- -21 J/kg
- Mixed-layer LCL
- 523 m above ground
- 0-6 km bulk shear
- 40 kt
- 0-1 km storm-relative helicity
- 14 m²/s²
- 0-3 km storm-relative helicity
- 63 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.0
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 10, 7:26 PM CDT | Mesoscale Discussion | SPC | Cedar, Dixon | 94 min |
| Aug 10, 11:28 PM CDT | Mesoscale Discussion | SPC | Dawes | 92 min |
| Aug 11, 3:08 PM CDT | Mesoscale Discussion | SPC | Adams, Arthur, Boone, Buffalo, Butler, Chase and 38 more | 97 min |
| Aug 11, 3:37 PM CDT | Mesoscale Discussion | SPC | Dawes, Sheridan | 53 min |
Nearby
Mesoscale Discussions in Iowa, 2013Mesoscale Discussions in Nebraska, 2013Every mesoscale discussion in 2013
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.