Alert archive / Iowa / Mesoscale Discussions in 2017
Mesoscale Discussion 1380
The Storm Prediction Center issued this mesoscale discussion at Jul 21, 2017, 1:32 PM CDT for 8 counties in Illinois; 41 counties in Iowa. It was in force for 2 hr.
The area
The outline as issued.
The facts
- Issued
- Jul 21, 2017, 1:32 PM CDT (18:32 UTC)
- Expired
- Jul 21, 2017, 4:00 PM CDT
- In force
- 2 hr
- Issued by
- the Storm Prediction Center
- Chance of a watch
- 80%
All 49 counties
Audubon County, IA, Benton County, IA, Black Hawk County, IA, Boone County, IA, Buchanan County, IA, Calhoun County, IA, Carroll County, IA, Cedar County, IA, Clinton County, IA, Crawford County, IA, Dallas County, IA, Delaware County, IA, Greene County, IA, Grundy County, IA, Guthrie County, IA, Hamilton County, IA, Hardin County, IA, Ida County, IA, Iowa County, IA, Jackson County, IA, Jasper County, IA, Johnson County, IA, Jones County, IA, Keokuk County, IA, Linn County, IA, Louisa County, IA, Mahaska County, IA, Marion County, IA, Marshall County, IA, Monona County, IA, Muscatine County, IA, Polk County, IA, Poweshiek County, IA, Sac County, IA, Scott County, IA, Shelby County, IA, Story County, IA, Tama County, IA, Warren County, IA, Washington County, IA, Webster County, IA, Carroll County, IL, Henry County, IL, Jo Daviess County, IL, Lee County, IL, Mercer County, IL, Ogle County, IL, Rock Island County, IL, Whiteside County, IL
The radar
The Des Moines radar (KDMX), 124 km from the middle of the area, began a volume at 18:32 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, 6.5 hours before the alert went out and 152 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
- 81 J/kg
- Mixed-layer CIN
- -302 J/kg
- Mixed-layer LCL
- 1173 m above ground
- 0-6 km bulk shear
- 26 kt
- 0-1 km storm-relative helicity
- 125 m²/s²
- 0-3 km storm-relative helicity
- 192 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.0
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 |
|---|---|---|---|---|
| Jul 21, 1:11 AM CDT | Mesoscale Discussion | SPC | Bureau, Ford, Grundy, Iroquois, Kankakee, LaSalle and 7 more | 94 min |
| Jul 21, 4:52 PM CDT | Severe Thunderstorm Watch | SPC | Boone, Bureau, Carroll, Cook, DeKalb, DuPage and 28 more | 9 hr |
| Jul 21, 6:28 PM CDT | Mesoscale Discussion | SPC | Boone, Bureau, Carroll, Cook, DeKalb, DuPage and 23 more | 92 min |
Nearby
Mesoscale Discussions in Iowa, 2017Mesoscale Discussions in Illinois, 2017Every mesoscale discussion in 2017
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.