Alert archive / Colorado / Severe Thunderstorm Warnings in 2025
Severe Thunderstorm Warning 337, NWS Denver/Boulder, CO
NWS Denver/Boulder, CO issued this severe thunderstorm warning at Aug 23, 2025, 3:49 PM MDT for Boulder County, Gilpin County, Jefferson County, Colorado. It was in force for 26 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
- Aug 23, 2025, 3:49 PM MDT (21:49 UTC)
- Expired
- Aug 23, 2025, 4:15 PM MDT
- In force
- 26 min
- Issued by
- NWS Denver/Boulder, CO
- Area
- Storm-based polygon
- Hail
- 1.0 in
- Wind
- 50.0 mph
Counties Boulder County, CO, Gilpin County, CO, Jefferson County, CO
The radar
The Denver radar (KFTG), 71 km from the middle of the area, began a volume at 21:52 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 Aug 23, 2:59 PM MDT, 50 minutes earlier.
Area forecast discussion, Aug 23, 2:59 PM MDT, 50 minutes before
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</html>Hazardous weather outlook, Aug 23, 10:31 AM MDT, 5 hours 18 minutes before
Hazardous Weather Outlook National Weather Service Denver/Boulder CO 1031 AM MDT Sat Aug 23 2025 COZ030>051-241645- 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- 1031 AM MDT Sat Aug 23 2025 This hazardous weather outlook is for northeast and north central Colorado. .DAY ONE...Today and Tonight Scattered showers and thunderstorms will redevelop this afternoon and spread southeast across portions of the I-25 Corridor and plains. While storms are expected to gradually weaken as they move from the mountains and foothills into the lower elevations, there is a small risk of one or two strong or severe storms. That is a conditional threat, depending on exactly how much heating occurs today. Temperatures would have to get at least into the lower 80s to support that severe threat, and it looks like most locations will stay slightly cooler than that. .DAYS TWO THROUGH SEVEN...Sunday through Friday The weather pattern will remain active with daily chances of showers and thunderstorms. A couple of the storms Sunday may also become severe, and also produce locally heavy rain. Monday will likely see more widespread showers and thunderstorms and also a greater threat of heavy rainfall. Scattered showers and storms, along with cooler temperatures, will stay in the forecast picture for all of next week. .SPOTTER INFORMATION STATEMENT... Spotter activation will not be needed today or tonight.
In the hours before
Special weather statement, Aug 23, 3:11 PM MDT, 38 minutes before
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<div class="status" id="status">Temporary Notice</div>
<h1 id="headline">This service is currently unavailable.</h1>
<p id="message1">
The site you requested is temporarily down for maintenance or an unexpected outage.
</p>
<p id="message2">
Please try again in a few minutes.
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If you are an administrator, restore upstream service and remove the redirect/fallback rule when normal operations resume.
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</html>The office that day
Everything else NWS Denver/Boulder, CO issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Aug 23, 3:11 PM MDT | Special Weather Statement | BOU | Boulder | 34 min |
| Aug 23, 3:29 PM MDT | Special Weather Statement | BOU | Jefferson | 46 min |
| Aug 23, 3:43 PM MDT | Special Weather Statement | BOU | Gilpin | 47 min |
| Aug 23, 3:51 PM MDT | Special Weather Statement | BOU | Park | 39 min |
| Aug 23, 4:13 PM MDT | Severe Thunderstorm Warning | BOU | Clear Creek, Gilpin, Jefferson | 47 min |
| Aug 23, 4:54 PM MDT | Severe Thunderstorm Warning | BOU | Douglas, Jefferson, Park | 36 min |
| Aug 23, 5:27 PM MDT | Special Weather Statement | BOU | Douglas | 48 min |
Nearby
Severe Thunderstorm Warnings in Colorado, 2025Every 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.