Alert archive / Iowa / Mesoscale Discussions in 2018
Mesoscale Discussion 876
The Storm Prediction Center issued this mesoscale discussion at Jun 25, 2018, 5:14 PM CDT for 20 counties in Iowa; 5 counties in Missouri; 17 counties in Nebraska. It was in force for 2 hr.
The area
The outline as issued.
The facts
- Issued
- Jun 25, 2018, 5:14 PM CDT (22:14 UTC)
- Expired
- Jun 25, 2018, 7:15 PM CDT
- In force
- 2 hr
- Issued by
- the Storm Prediction Center
- Chance of a watch
- 40%
All 42 counties
Adair County, IA, Adams County, IA, Audubon County, IA, Cass County, IA, Clarke County, IA, Decatur County, IA, Fremont County, IA, Guthrie County, IA, Lucas County, IA, Madison County, IA, Mills County, IA, Montgomery County, IA, Page County, IA, Pottawattamie County, IA, Ringgold County, IA, Shelby County, IA, Taylor County, IA, Union County, IA, Warren County, IA, Wayne County, IA, Atchison County, MO, Harrison County, MO, Mercer County, MO, Nodaway County, MO, Worth County, MO, Butler County, NE, Cass County, NE, Douglas County, NE, Gage County, NE, Jefferson County, NE, Johnson County, NE, Lancaster County, NE, Nemaha County, NE, Otoe County, NE, Pawnee County, NE, Polk County, NE, Richardson County, NE, Saline County, NE, Sarpy County, NE, Saunders County, NE, Seward County, NE, Washington County, NE
The radar
The Omaha radar (KOAX), 106 km from the middle of the area, began a volume at 22:15 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
Omaha, NE (KOAX), launched 12:00Z, 10.2 hours before the alert went out and 106 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
- 118 J/kg
- Mixed-layer CIN
- -61 J/kg
- Mixed-layer LCL
- 796 m above ground
- 0-6 km bulk shear
- 9 kt
- 0-1 km storm-relative helicity
- -89 m²/s²
- 0-3 km storm-relative helicity
- -80 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.0
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 |
|---|---|---|---|---|
| Jun 25, 5:40 PM CDT | Tornado Watch | SPC | Adair, Adams, Audubon, Boone, Carroll, Cass and 13 more | 3 hr |
| Jun 25, 3:34 AM CDT | Mesoscale Discussion | SPC | Jasper, McDonald, Newton | 86 min |
| Jun 25, 3:23 PM CDT | Mesoscale Discussion | SPC | Audrain, Boone, Callaway, Cape Girardeau, Cole, Cooper and 27 more | 97 min |
| Jun 24, 7:51 PM CDT | Mesoscale Discussion | SPC | Franklin, Webster | 84 min |
Nearby
Mesoscale Discussions in Iowa, 2018Mesoscale Discussions in Nebraska, 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.