Alert archive / Iowa / Mesoscale Discussions in 2018
Mesoscale Discussion 312
The Storm Prediction Center issued this mesoscale discussion at May 1, 2018, 9:38 PM CDT for 35 counties in Iowa. It was in force for 67 min.
The area
The outline as issued.
The facts
- Issued
- May 1, 2018, 9:38 PM CDT (02:38 UTC)
- Expired
- May 1, 2018, 10:45 PM CDT
- In force
- 67 min
- Issued by
- the Storm Prediction Center
All 35 counties
Adair County, IA, Audubon County, IA, Benton County, IA, Black Hawk County, IA, Boone County, IA, Bremer County, IA, Buchanan County, IA, Butler County, IA, Calhoun County, IA, Carroll County, IA, Cass County, IA, Clayton County, IA, Dallas County, IA, Delaware County, IA, Dubuque County, IA, Fayette County, IA, Franklin County, IA, Greene County, IA, Grundy County, IA, Guthrie County, IA, Hamilton County, IA, Hardin County, IA, Iowa County, IA, Jasper County, IA, Linn County, IA, Madison County, IA, Mahaska County, IA, Marion County, IA, Marshall County, IA, Polk County, IA, Poweshiek County, IA, Story County, IA, Tama County, IA, Warren County, IA, Webster County, IA
The radar
The Des Moines radar (KDMX), 73 km from the middle of the area, began a volume at 02:37 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
Davenport, (KDVN), launched 00:00Z, 2.6 hours before the alert went out and 211 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
- 38 J/kg
- Mixed-layer CIN
- -182 J/kg
- Mixed-layer LCL
- 2336 m above ground
- 0-6 km bulk shear
- 37 kt
- 0-1 km storm-relative helicity
- 101 m²/s²
- 0-3 km storm-relative helicity
- 174 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.1
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 |
|---|---|---|---|---|
| May 1, 7:24 PM CDT | Mesoscale Discussion | SPC | Adams, Cass, Fremont, Harrison, Mills, Montgomery and 4 more | 2 hr |
| May 1, 7:55 PM CDT | Mesoscale Discussion | SPC | Adair, Allamakee, Audubon, Benton, Black Hawk, Boone and 48 more | 95 min |
| May 2, 1:33 PM CDT | Mesoscale Discussion | SPC | Cedar, Clinton, Des Moines, Henry, Jackson, Jefferson and 9 more | 117 min |
| May 2, 3:56 PM CDT | Severe Thunderstorm Watch | SPC | Cedar, Clinton, Des Moines, Henry, Iowa, Jackson and 10 more | 9 hr |
| May 2, 5:08 PM CDT | Mesoscale Discussion | SPC | Adair, Adams, Appanoose, Clarke, Davis, Decatur and 15 more | 97 min |
| May 2, 5:27 PM CDT | Tornado Watch | SPC | Adams, Appanoose, Clarke, Davis, Decatur, Lucas and 9 more | 8 hr |
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.