Alert archive / Colorado / Severe Thunderstorm Warnings in 2026

Severe Thunderstorm Warning 387, NWS Denver/Boulder, CO

September 6, 2026Larimer County, Weld County, Colorado

NWS Denver/Boulder, CO issued this severe thunderstorm warning at Sep 6, 2026, 10:52 PM MDT for Larimer County, Weld County, Colorado. It was in force for 38 min. No storm report in the archive falls inside the area while it was in force.

The area

The counties it named.

The facts

Issued: Sep 6, 2026, 10:52 PM MDT (04:52 UTC)
Expired: Sep 6, 2026, 11:30 PM MDT
In force: 38 min
Issued by: NWS Denver/Boulder, CO
Area: Storm-based polygon
Hail: 1.0 in
Wind: 60.0 mph

Counties Larimer County, CO, Weld County, CO

The radar

The Cheyenne radar (KCYS), 61 km from the middle of the area, began a volume at 04:56 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 office that day

Everything else NWS Denver/Boulder, CO issued on the same UTC day.

Issued	Product	Office	Counties	Lasted
Sep 6, 6:21 PM MDT	Special Weather Statement	BOU	Weld	39 min
Sep 6, 6:26 PM MDT	Special Weather Statement	BOU	Adams	49 min
Sep 6, 6:54 PM MDT	Severe Thunderstorm Warning	BOU	Weld	26 min
Sep 6, 7:17 PM MDT	Severe Thunderstorm Warning	BOU	Weld	28 min
Sep 6, 9:44 PM MDT	Special Weather Statement	BOU	Gilpin	46 min
Sep 6, 10:42 PM MDT	Special Weather Statement	BOU	Larimer	33 min
Sep 6, 11:23 PM MDT	Areal Flood Advisory	BOU	Larimer	2 hr
Sep 7, 5:26 PM MDT	Special Weather Statement	BOU	Morgan	49 min
Sep 7, 5:39 PM MDT	Severe Thunderstorm Warning	BOU	Adams, Morgan, Washington	51 min

Nearby

Severe Thunderstorm Warnings in Colorado, 2026 Every severe thunderstorm warning in 2026

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.