Alert archive / Iowa / Mesoscale Discussions in 2011
Mesoscale Discussion 1711
The Storm Prediction Center issued this mesoscale discussion at Jul 23, 2011, 4:57 PM CDT for 32 counties in Iowa; 7 counties in Missouri; Nemaha County, Nebraska. It was in force for 93 min.
The area
The outline as issued.
The facts
- Issued
- Jul 23, 2011, 4:57 PM CDT (21:57 UTC)
- Expired
- Jul 23, 2011, 6:30 PM CDT
- In force
- 93 min
- Issued by
- the Storm Prediction Center
All 40 counties
Adair County, IA, Adams County, IA, Appanoose County, IA, Cass County, IA, Clarke County, IA, Dallas County, IA, Davis County, IA, Decatur County, IA, Fremont County, IA, Henry County, IA, Jasper County, IA, Jefferson County, IA, Keokuk County, IA, Lucas County, IA, Madison County, IA, Mahaska County, IA, Marion County, IA, Mills County, IA, Monroe County, IA, Montgomery County, IA, Page County, IA, Polk County, IA, Pottawattamie 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, Atchison County, MO, Mercer County, MO, Nodaway County, MO, Putnam County, MO, Schuyler County, MO, Scotland County, MO, Worth County, MO, Nemaha County, NE
The radar
The Des Moines radar (KDMX), 85 km from the middle of the area, began a volume at 21:59 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
Omaha, NE (KOAX), launched 12:00Z, 10.0 hours before the alert went out and 218 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
- 1494 J/kg
- Mixed-layer CIN
- -247 J/kg
- Mixed-layer LCL
- 1815 m above ground
- 0-6 km bulk shear
- 23 kt
- 0-1 km storm-relative helicity
- 135 m²/s²
- 0-3 km storm-relative helicity
- 65 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 |
|---|---|---|---|---|
| Jul 22, 7:38 PM CDT | Mesoscale Discussion | SPC | Benton, Black Hawk, Bremer, Buchanan, Butler, Cedar and 19 more | 97 min |
| Jul 23, 10:14 AM CDT | Severe Thunderstorm Watch | SPC | Allamakee, Howard, Winneshiek | 4 hr |
| Jul 23, 1:10 PM CDT | Mesoscale Discussion | SPC | Allamakee, Winneshiek | 65 min |
| Jul 23, 1:52 PM CDT | Mesoscale Discussion | SPC | Clay, Dickinson, Emmet, Hancock, Kossuth, Lyon and 6 more | 83 min |
| Jul 23, 5:16 PM CDT | Severe Thunderstorm Watch | SPC | Adair, Adams, Appanoose, Cass, Clarke, Davis and 25 more | 4 hr |
Nearby
Mesoscale Discussions in Iowa, 2011Mesoscale Discussions in Missouri, 2011Mesoscale Discussions in Nebraska, 2011Every mesoscale discussion in 2011
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.