Alert archive / Iowa / Mesoscale Discussions in 2018
Mesoscale Discussion 1252
The Storm Prediction Center issued this mesoscale discussion at Aug 6, 2018, 6:38 PM CDT for 4 states. It was in force for 2 hr.
The area
The outline as issued.
The facts
- Issued
- Aug 6, 2018, 6:38 PM CDT (23:38 UTC)
- Expired
- Aug 6, 2018, 8:45 PM CDT
- In force
- 2 hr
- Issued by
- the Storm Prediction Center
- Chance of a watch
- 20%
All 41 counties
Adams County, IA, Appanoose County, IA, Clarke County, IA, Davis County, IA, Decatur County, IA, Fremont County, IA, Lucas County, IA, Mills County, IA, Monroe County, IA, Montgomery County, IA, Page County, IA, Ringgold County, IA, Taylor County, IA, Union County, IA, Van Buren County, IA, Wapello County, IA, Wayne County, IA, Brown County, KS, Doniphan County, KS, Nemaha County, KS, Adair County, MO, Andrew County, MO, Atchison County, MO, Daviess County, MO, DeKalb County, MO, Gentry County, MO, Grundy County, MO, Harrison County, MO, Holt County, MO, Mercer County, MO, Nodaway County, MO, Putnam County, MO, Schuyler County, MO, Scotland County, MO, Sullivan County, MO, Worth County, MO, Johnson County, NE, Nemaha County, NE, Otoe County, NE, Pawnee County, NE, Richardson County, NE
The radar
The Des Moines radar (KDMX), 161 km from the middle of the area, began a volume at 23:39 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, 11.6 hours before the alert went out and 183 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
- 94 J/kg
- Mixed-layer CIN
- -247 J/kg
- Mixed-layer LCL
- 731 m above ground
- 0-6 km bulk shear
- 26 kt
- 0-1 km storm-relative helicity
- -49 m²/s²
- 0-3 km storm-relative helicity
- -183 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 |
|---|---|---|---|---|
| Aug 5, 9:32 PM CDT | Mesoscale Discussion | SPC | Adair, Adams, Audubon, Boone, Butler, Calhoun and 29 more | 2 hr |
| Aug 6, 2:31 PM CDT | Mesoscale Discussion | SPC | Harrison, Mills, Pottawattamie | 89 min |
| Aug 5, 8:16 PM CDT | Mesoscale Discussion | SPC | Decatur, Ellis, Gove, Graham, Lane, Logan and 12 more | 119 min |
| Aug 6, 3:16 PM CDT | Mesoscale Discussion | SPC | Bollinger, Butler, Cape Girardeau, Carter, Dunklin, Madison and 9 more | 2 hr |
| Aug 5, 7:05 PM CDT | Mesoscale Discussion | SPC | Banner, Cheyenne, Kimball, Scotts Bluff, Sioux | 115 min |
| Aug 6, 3:02 PM CDT | Mesoscale Discussion | SPC | Banner, Kimball | 88 min |
| Aug 6, 3:37 PM CDT | Severe Thunderstorm Watch | SPC | Banner, Cheyenne, Kimball, Morrill, Scotts Bluff | 7 hr |
| Aug 6, 3:49 PM CDT | Mesoscale Discussion | SPC | Box Butte, Cherry, Dawes, Sheridan, Sioux | 86 min |
| Aug 6, 6:24 PM CDT | Mesoscale Discussion | SPC | Banner, Box Butte, Cheyenne, Kimball, Morrill, Scotts Bluff and 1 more | 66 min |
Nearby
Mesoscale Discussions in Iowa, 2018Mesoscale Discussions in Missouri, 2018Mesoscale Discussions in Nebraska, 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.