Alert archive / Iowa / Mesoscale Discussions in 2018
Mesoscale Discussion 1550
The Storm Prediction Center issued this mesoscale discussion at Oct 9, 2018, 12:59 PM CDT for 25 counties in Iowa; 9 counties in Missouri. It was in force for 3 hr.
The area
The outline as issued.
The facts
- Issued
- Oct 9, 2018, 12:59 PM CDT (17:59 UTC)
- Expired
- Oct 9, 2018, 3:30 PM CDT
- In force
- 3 hr
- Issued by
- the Storm Prediction Center
- Chance of a watch
- 80%
All 34 counties
Appanoose County, IA, Benton County, IA, Buchanan County, IA, Clarke County, IA, Davis County, IA, Decatur County, IA, Henry County, IA, Iowa County, IA, Jasper County, IA, Jefferson County, IA, Johnson County, IA, Keokuk County, IA, Linn County, IA, Lucas County, IA, Mahaska County, IA, Marion County, IA, Marshall County, IA, Monroe County, IA, Poweshiek County, IA, Tama County, IA, Van Buren County, IA, Wapello County, IA, Warren County, IA, Washington County, IA, Wayne County, IA, Adair County, MO, Clark County, MO, Grundy County, MO, Knox County, MO, Mercer County, MO, Putnam County, MO, Schuyler County, MO, Scotland County, MO, Sullivan County, MO
The radar
The Des Moines radar (KDMX), 123 km from the middle of the area, began a volume at 18:00 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 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, 6.0 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, 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, 3:53 PM CDT | Mesoscale Discussion | SPC | Appanoose, Benton, Black Hawk, Boone, Buchanan, Clarke and 29 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 |
| Oct 9, 11:31 AM CDT | Mesoscale Discussion | SPC | Barry, Barton, Bates, Benton, Buchanan, Caldwell and 24 more | 89 min |
| Oct 9, 12:17 PM CDT | Tornado Watch | SPC | Barry, Barton, Benton, Camden, Cedar, Christian and 19 more | 8 hr |
| Oct 9, 3:06 PM CDT | Mesoscale Discussion | SPC | Andrew, Barton, Bates, Buchanan, Caldwell, Carroll and 21 more | 84 min |
| Oct 9, 6:22 PM CDT | Mesoscale Discussion | SPC | Ozark, Taney | 83 min |
Nearby
Mesoscale Discussions in Iowa, 2018Mesoscale Discussions in Missouri, 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.