Alert archive / Iowa / Mesoscale Discussions in 2018

Mesoscale Discussion 1477

September 18, 20186 counties in Iowa; 4 counties in Missouri; Cass County, Sarpy County, Nebraska

The Storm Prediction Center issued this mesoscale discussion at Sep 18, 2018, 5:11 PM CDT for 6 counties in Iowa; 4 counties in Missouri; Cass County, Sarpy County, Nebraska. It was in force for 64 min.

The area

The outline as issued.

The facts

Issued
Sep 18, 2018, 5:11 PM CDT (22:11 UTC)
Expired
Sep 18, 2018, 6:15 PM CDT
In force
64 min
Issued by
the Storm Prediction Center
Chance of a watch
20%

Counties Fremont County, IA, Mills County, IA, Montgomery County, IA, Page County, IA, Ringgold County, IA, Taylor County, IA, Atchison County, MO, Harrison County, MO, Nodaway County, MO, Worth County, MO, Cass County, NE, Sarpy County, NE

The radar

The Omaha radar (KOAX), 109 km from the middle of the area, began a volume at 22:14 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 text

As transmitted.

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SPC that day

Everything else SPC issued on the same UTC day.

IssuedProductOfficeCountiesLasted
Sep 18, 2:48 AM CDTMesoscale DiscussionSPCLyon2 hr
Sep 18, 5:48 AM CDTMesoscale DiscussionSPCDickinson, Emmet, Lyon, Osceola2 hr
Sep 18, 3:06 PM CDTMesoscale DiscussionSPCAdair, Adams, Audubon, Cass, Clarke, Decatur and 13 more84 min
Sep 17, 7:49 PM CDTMesoscale DiscussionSPCAntelope, Blaine, Boone, Boyd, Brown, Cedar and 16 more116 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; radar from the NEXRAD Level II archive.