Alert archive / Colorado / Severe Thunderstorm Warnings in 2025

Severe Thunderstorm Warning 97, NWS Denver/Boulder, CO

June 12, 2025Larimer County, Colorado

NWS Denver/Boulder, CO issued this severe thunderstorm warning at Jun 12, 2025, 3:11 PM MDT for Larimer County, Colorado. It was in force for 22 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: Jun 12, 2025, 3:11 PM MDT (21:11 UTC)
Expired: Jun 12, 2025, 3:33 PM MDT
In force: 22 min
Issued by: NWS Denver/Boulder, CO
Area: Storm-based polygon
Hail: 1.0 in
Wind: 60.0 mph

County Larimer County, CO

The radar

The Cheyenne radar (KCYS), 77 km from the middle of the area, began a volume at 21:14 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.

What forecasters said that day

The local office's own words before this severe thunderstorm warning went out, as it sent them, from the Iowa Environmental Mesonet's archive of National Weather Service text.

NWS Denver/Boulder, CO wrote its last area forecast discussion before this severe thunderstorm warning went out at Jun 12, 2:19 PM MDT, 52 minutes earlier.

Area forecast discussion, Jun 12, 2:19 PM MDT, 52 minutes before

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Hazardous weather outlook, Jun 12, 9:33 AM MDT, 5 hours 38 minutes before

Hazardous Weather Outlook
National Weather Service Denver/Boulder CO
933 AM MDT Thu Jun 12 2025

COZ030>051-131545-
Jackson County Below 9000 Feet-
West Jackson and West Grand Counties Above 9000 Feet-
Grand and Summit Counties Below 9000 Feet-
South and East Jackson/Larimer/North and Northeast Grand/
Northwest Boulder Counties Above 9000 Feet-
South and Southeast Grand/West Central and Southwest Boulder/
Gilpin/Clear Creek/Summit/North and West Park Counties Above
9000 Feet-Larimer and Boulder Counties Between 6000 and 9000 Feet-
Jefferson and West Douglas Counties Above 6000 Feet/Gilpin/Clear
Creek/Northeast Park Counties Below 9000 Feet-
Central and Southeast Park County-
Larimer County Below 6000 Feet/Northwest Weld County-
Boulder And Jefferson Counties Below 6000 Feet/West Broomfield
County-
North Douglas County Below 6000 Feet/Denver/West Adams and
Arapahoe Counties/East Broomfield County-
Elbert/Central and East Douglas Counties Above 6000 Feet-
Northeast Weld County-Central and South Weld County-Morgan County-
Central and East Adams and Arapahoe Counties-
North and Northeast Elbert County Below 6000 Feet/North Lincoln
County-
Southeast Elbert County Below 6000 Feet/South Lincoln County-
Logan County-Washington County-Sedgwick County-Phillips County-
933 AM MDT Thu Jun 12 2025

This hazardous weather outlook is for northeast and north central
Colorado.

.DAY ONE...Today and Tonight

Scattered showers and thunderstorms this afternoon will bring
gusty winds, with speeds reaching up to 50 mph. A few storms could
become severe with 60 mph winds. Over the northeast corner of
Colorado, one inch hail may occur with the severe thunderstorms as
well.

.DAYS TWO THROUGH SEVEN...Friday through Wednesday

Scattered afternoon showers and thunderstorms are expected again
Friday. Some strong to severe storms will be possible over the
northeast plains Friday afternoon. For the weekend, the chance for
storms is limited to the northeastern plain. Where a severe storm
or two will be possible.

.SPOTTER INFORMATION STATEMENT...

Spotter activation will not be needed today and tonight.

In the hours before

Special weather statement, Jun 12, 1:12 PM MDT, 1 hour 59 minutes before

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Special weather statement, Jun 12, 1:28 PM MDT, 1 hour 43 minutes before

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Special weather statement, Jun 12, 2:05 PM MDT, 1 hour 6 minutes before

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Special weather statement, Jun 12, 2:17 PM MDT, 54 minutes before

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The office that day

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

Issued	Product	Office	Counties	Lasted
Jun 11, 6:14 PM MDT	Special Weather Statement	BOU	Lincoln	31 min
Jun 11, 6:51 PM MDT	Special Weather Statement	BOU	Lincoln	39 min
Jun 11, 6:54 PM MDT	Severe Thunderstorm Warning	BOU	Lincoln	36 min
Jun 11, 6:58 PM MDT	Severe Thunderstorm Warning	BOU	Sedgwick	26 min
Jun 12, 1:12 PM MDT	Special Weather Statement	BOU	Park	48 min
Jun 12, 1:28 PM MDT	Special Weather Statement	BOU	Jackson	47 min
Jun 12, 1:45 PM MDT	Severe Thunderstorm Warning	BOU	Grand, Jackson	45 min
Jun 12, 2:05 PM MDT	Special Weather Statement	BOU	Gilpin	40 min
Jun 12, 2:17 PM MDT	Special Weather Statement	BOU	Larimer	43 min
Jun 12, 5:30 PM MDT	Severe Thunderstorm Warning	BOU	Logan, Morgan	38 min
Jun 12, 5:51 PM MDT	Severe Thunderstorm Warning	BOU	Morgan, Washington	23 min

Nearby

Severe Thunderstorm Warnings in Colorado, 2025 Every severe thunderstorm warning in 2025

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.