Alert archive / Iowa / Mesoscale Discussions in 2017
Mesoscale Discussion 1387
The Storm Prediction Center issued this mesoscale discussion at Jul 21, 2017, 8:35 PM CDT for 4 states. It was in force for 115 min.
The area
The outline as issued.
The facts
- Issued
- Jul 21, 2017, 8:35 PM CDT (01:35 UTC)
- Expired
- Jul 21, 2017, 10:30 PM CDT
- In force
- 115 min
- Issued by
- the Storm Prediction Center
All 76 counties
Benton County, IA, Black Hawk County, IA, Buchanan County, IA, Butler County, IA, Cedar County, IA, Clinton County, IA, Delaware County, IA, Dubuque County, IA, Franklin County, IA, Grundy County, IA, Hardin County, IA, Henry County, IA, Iowa County, IA, Jackson County, IA, Jasper County, IA, Jefferson 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, Muscatine County, IA, Polk County, IA, Poweshiek County, IA, Scott County, IA, Story County, IA, Tama County, IA, Wapello County, IA, Warren County, IA, Washington County, IA, Boone County, IL, Bureau County, IL, Carroll County, IL, Cook County, IL, DeKalb County, IL, DuPage County, IL, Grundy County, IL, Henry County, IL, Iroquois County, IL, Jo Daviess County, IL, Kane County, IL, Kankakee County, IL, Kendall County, IL, Knox County, IL, Lake County, IL, LaSalle County, IL, Lee County, IL, Livingston County, IL, Marshall County, IL, McHenry County, IL, Mercer County, IL, Ogle County, IL, Putnam County, IL, Rock Island County, IL, Stark County, IL, Stephenson County, IL, Whiteside County, IL, Will County, IL, Winnebago County, IL, Cass County, IN, Fulton County, IN, Jasper County, IN, Lake County, IN, LaPorte County, IN, Marshall County, IN, Newton County, IN, Porter County, IN, Pulaski County, IN, Saint Joseph County, IN, Starke County, IN, White County, IN, Berrien County, MI, Van Buren County, MI
The radar
The Quad Cities radar (KDVN), 39 km from the middle of the area, began a volume at 01:38 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
Lincoln, IL (KILX), launched 00:00Z, 1.6 hours before the alert went out and 265 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
- 2094 J/kg
- Mixed-layer CIN
- -2 J/kg
- Mixed-layer LCL
- 1572 m above ground
- 0-6 km bulk shear
- 25 kt
- 0-1 km storm-relative helicity
- 57 m²/s²
- 0-3 km storm-relative helicity
- 136 m²/s²
- Significant tornado parameter
- 0.2
- Supercell composite
- 6.5
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, 11:23 PM CDT | Mesoscale Discussion | SPC | Boone, Bureau, Carroll, Cook, DeKalb, DuPage and 23 more | 67 min |
| Jul 22, 12:53 AM CDT | Mesoscale Discussion | SPC | Boone, Carroll, Cass, Clinton, Delaware, Fayette and 14 more | 67 min |
| Jul 22, 1:08 AM CDT | Severe Thunderstorm Watch | SPC | Adams, Blackford, Boone, Carroll, Cass, Clinton and 31 more | 4 hr |
| Jul 22, 4:00 AM CDT | Mesoscale Discussion | SPC | Fayette, Franklin, Randolph, Rush, Union, Wayne | 90 min |
Nearby
Mesoscale Discussions in Iowa, 2017Mesoscale Discussions in Illinois, 2017Mesoscale Discussions in Indiana, 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.