Alert archive / Iowa / Mesoscale Discussions in 2018
Mesoscale Discussion 243
The Storm Prediction Center issued this mesoscale discussion at Apr 13, 2018, 5:31 PM CDT for 11 counties in Iowa; Atchison County, Missouri. It was in force for 29 min.
The area
The outline as issued.
The facts
- Issued
- Apr 13, 2018, 5:31 PM CDT (22:31 UTC)
- Expired
- Apr 13, 2018, 6:00 PM CDT
- In force
- 29 min
- Issued by
- the Storm Prediction Center
Counties Audubon County, IA, Carroll County, IA, Cass County, IA, Fremont County, IA, Greene County, IA, Guthrie County, IA, Mills County, IA, Montgomery County, IA, Page County, IA, Pottawattamie County, IA, Shelby County, IA, Atchison County, MO
The radar
The Des Moines radar (KDMX), 109 km from the middle of the area, began a volume at 22:34 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
Omaha, NE (KOAX), launched 12:00Z, 10.5 hours before the alert went out and 116 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
- 230 J/kg
- Mixed-layer CIN
- -547 J/kg
- Mixed-layer LCL
- 838 m above ground
- 0-6 km bulk shear
- 59 kt
- 0-1 km storm-relative helicity
- 342 m²/s²
- 0-3 km storm-relative helicity
- 346 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- -0.2
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 |
|---|---|---|---|---|
| Apr 13, 8:44 AM CDT | Mesoscale Discussion | SPC | Allamakee, Dickinson, Emmet, Howard, Lyon, Mitchell and 4 more | 3 hr |
| Apr 13, 2:06 PM CDT | Mesoscale Discussion | SPC | Adair, Adams, Cass, Clarke, Decatur, Fremont and 8 more | 2 hr |
| Apr 13, 2:19 PM CDT | Tornado Watch | SPC | Adair, Adams, Appanoose, Cass, Clarke, Davis and 17 more | 7 hr |
| Apr 13, 3:22 PM CDT | Severe Thunderstorm Watch | SPC | Audubon, Black Hawk, Boone, Calhoun, Carroll, Dallas and 13 more | 6 hr |
| Apr 13, 12:39 PM CDT | Mesoscale Discussion | SPC | Barton, Jasper, McDonald, Newton | 2 hr |
| Apr 13, 1:20 PM CDT | Tornado Watch | SPC | Barry, Barton, Cedar, Christian, Dade, Greene and 9 more | 9 hr |
| Apr 13, 3:43 PM CDT | Mesoscale Discussion | SPC | Barry, Barton, Dade, Jasper, Lawrence, McDonald and 1 more | 92 min |
| Apr 13, 5:08 PM CDT | Mesoscale Discussion | SPC | Benton, Camden, Carter, Christian, Cole, Dallas and 23 more | 2 hr |
| Apr 13, 5:27 PM CDT | Tornado Watch | SPC | Bollinger, Butler, Camden, Cape Girardeau, Carter, Crawford and 33 more | 8 hr |
| Apr 13, 5:53 PM CDT | Mesoscale Discussion | SPC | Dunklin | 97 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.