Alert archive / Iowa / Mesoscale Discussions in 2018
Mesoscale Discussion 1553
The Storm Prediction Center issued this mesoscale discussion at Oct 9, 2018, 3:53 PM CDT for 35 counties in Iowa. It was in force for 2 hr.
The area
The outline as issued.
The facts
- Issued
- Oct 9, 2018, 3:53 PM CDT (20:53 UTC)
- Expired
- Oct 9, 2018, 6:00 PM CDT
- In force
- 2 hr
- Issued by
- the Storm Prediction Center
All 35 counties
Appanoose County, IA, Benton County, IA, Black Hawk County, IA, Boone County, IA, Buchanan County, IA, Clarke County, IA, Dallas County, IA, Davis County, IA, Decatur County, IA, Delaware County, IA, Grundy County, IA, Hardin County, IA, Iowa County, IA, Jasper County, IA, Jefferson County, IA, Johnson County, IA, Keokuk County, IA, Linn County, IA, Lucas County, IA, Madison County, IA, Mahaska County, IA, Marion County, IA, Marshall County, IA, Monroe County, IA, Polk County, IA, Poweshiek County, IA, Ringgold County, IA, Story County, IA, Tama County, IA, Union County, IA, Van Buren County, IA, Wapello County, IA, Warren County, IA, Washington County, IA, Wayne County, IA
The radar
The Des Moines radar (KDMX), 91 km from the middle of the area, began a volume at 20:56 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, 8.9 hours before the alert went out and 178 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
- 459 J/kg
- Mixed-layer CIN
- -49 J/kg
- Mixed-layer LCL
- 1071 m above ground
- 0-6 km bulk shear
- 35 kt
- 0-1 km storm-relative helicity
- 82 m²/s²
- 0-3 km storm-relative helicity
- 116 m²/s²
- Significant tornado parameter
- 0.1
- Supercell composite
- 0.7
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 |
|---|---|---|---|---|
| Oct 8, 7:03 PM CDT | Mesoscale Discussion | SPC | Appanoose, Clarke, Dallas, Decatur, Jasper, Lucas and 9 more | 57 min |
| Oct 9, 12:59 PM CDT | Mesoscale Discussion | SPC | Appanoose, Benton, Buchanan, Clarke, Davis, Decatur and 19 more | 3 hr |
| Oct 9, 1:46 PM CDT | Tornado Watch | SPC | Adair, Adams, Appanoose, Benton, Black Hawk, Boone and 36 more | 7 hr |
| Oct 9, 2:45 PM CDT | Mesoscale Discussion | SPC | Cedar, Clinton, Dubuque, Jackson, Jones, Muscatine and 1 more | 2 hr |
| Oct 9, 5:09 PM CDT | Tornado Watch | SPC | Allamakee, Clayton, Fayette | 4 hr |
| Oct 9, 6:37 PM CDT | Mesoscale Discussion | SPC | Allamakee, Appanoose, Benton, Black Hawk, Bremer, Buchanan and 21 more | 83 min |
Nearby
Mesoscale Discussions in Iowa, 2018Every mesoscale discussion in 2018
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.