Alert archive / Iowa / Mesoscale Discussions in 2015

Mesoscale Discussion 1811

September 17, 20154 states

The Storm Prediction Center issued this mesoscale discussion at Sep 17, 2015, 5:47 PM CDT for 4 states. It was in force for 118 min.

The area

The outline as issued.

The facts

Issued: Sep 17, 2015, 5:47 PM CDT (22:47 UTC)
Expired: Sep 17, 2015, 7:45 PM CDT
In force: 118 min
Issued by: the Storm Prediction Center
Chance of a watch: 40%

All 28 counties

Adair County, IA, Adams County, IA, Clarke County, IA, Dallas County, IA, Decatur County, IA, Fremont County, IA, Lucas County, IA, Madison County, IA, Montgomery County, IA, Page County, IA, Polk County, IA, Ringgold County, IA, Taylor County, IA, Union County, IA, Warren County, IA, Brown County, KS, Doniphan County, KS, Andrew County, MO, Atchison County, MO, DeKalb County, MO, Gentry County, MO, Harrison County, MO, Holt County, MO, Nodaway County, MO, Worth County, MO, Nemaha County, NE, Pawnee County, NE, Richardson County, NE

The radar

The Omaha radar (KOAX), 151 km from the middle of the area, began a volume at 22:48 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.

Severe Thunderstorm Watch 511Sep 17, 6:35 PM CDT

The text

As transmitted, in the capitals the NWS used until 2016.

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SPC that day

Everything else SPC issued on the same UTC day.

Issued	Product	Office	Counties	Lasted
Sep 17, 3:58 PM CDT	Mesoscale Discussion	SPC	Buena Vista, Calhoun, Cerro Gordo, Chickasaw, Clay, Dickinson and 14 more	2 hr
Sep 17, 6:38 PM CDT	Severe Thunderstorm Watch	SPC	Adams, Appanoose, Clarke, Davis, Decatur, Lucas and 7 more	6 hr

Nearby

Mesoscale Discussions in Iowa, 2015 Mesoscale Discussions in Missouri, 2015 Mesoscale Discussions in Nebraska, 2015 Every mesoscale discussion in 2015

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.