Hail in Colorado, August 23, 2025

Name: Hail in Colorado, August 23, 2025
Start: 2025-08-23T14:35
End: 2025-08-23T16:06
Location: Colorado

August 23, 2025 · NWS BOU · 7 events in 3 counties and zones

5 inches in diameter.

Where it happened

Every event with a place to put it. Tap one for its entry below.

Tornadoes
Tropical storms and surge
Floods
Wind
Hail
Winter weather
Heat and drought
Cold
Fire, smoke and dust
Marine and coastal
Other

Open the live radar over this ground

The toll

Deaths: 0
Injuries: 0
Property damage: None recorded
Crop damage: None recorded
Events: 7

Deaths and injuries are direct and indirect together, as the offices filed them. Damage is property and crops in the dollars of the year, not adjusted for inflation, and only where an office estimated it.

What happened

The episode as NWS BOU wrote it up.

Two supercell thunderstorms tracked south across the foothills producing damaging hail as large as 1.5 inches in diameter.

What forecasters said that day

The local office's own words before the first event, 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 the first event at Aug 23, 1:59 PM MST, 36 minutes earlier.

Area forecast discussion, Aug 23, 1:59 PM MST, 36 minutes before

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Hazardous weather outlook, Aug 23, 9:31 AM MST, 5 hours 4 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, 2:11 PM MST, 24 minutes before

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Special weather statement, Aug 23, 2:29 PM MST, 6 minutes before

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The radar

The Denver radar (KFTG), 91 km away, was scanning. The volume nearest the first event began at 21:37 UTC.

Open the radar archive at this moment

Event by event

7 hail. Local standard time, as filed.

Hail, Park

When: August 23, 2:35 PM MST to 2:36 PM MST
Where: Park County, 1.27 mi WNW of Bailey
Measured: 1 in hail
Reported by: Public
Coordinates: 39.410, -105.490

The report was from mPING.

Hail, Gilpin

When: August 23, 2:54 PM MST
Where: Gilpin County, 5.3 mi E of Rollinsville
Measured: 0.75 in hail
Reported by: Trained Spotter
Coordinates: 39.920, -105.400

Hail, Jefferson

When: August 23, 3:17 PM MST to 3:19 PM MST
Where: Jefferson County, 5.75 mi NNW of Bergen Park
Measured: 1 in hail
Reported by: CoCoRaHS
Coordinates: 39.770, -105.390

Hail, Jefferson

When: August 23, 3:42 PM MST to 3:45 PM MST
Where: Jefferson County, 1.06 mi W of Evergreen
Measured: 0.75 in hail
Reported by: Public
Coordinates: 39.630, -105.340

Hail, Jefferson

When: August 23, 3:57 PM MST to 3:59 PM MST
Where: Jefferson County, 2.54 mi WNW of Conifer
Measured: 1.5 in hail
Reported by: Public
Coordinates: 39.540, -105.340

Hail, Jefferson

When: August 23, 3:58 PM MST to 4:00 PM MST
Where: Jefferson County, 1.07 mi W of Conifer
Measured: 1 in hail
Reported by: Public
Coordinates: 39.520, -105.320

Hail, Jefferson

When: August 23, 4:02 PM MST to 4:06 PM MST
Where: Jefferson County, 1.48 mi SSE of Conifer
Measured: 1 in hail
Reported by: Trained Spotter
Coordinates: 39.500, -105.290

What these are

Hail: Hail three-quarters of an inch or larger, or smaller hail that caused damage, filed with the largest stone measured.

After NWS Directive 10-1605, the rules offices file Storm Data by.

The same day elsewhere

Every storm in Colorado in 2025 Every state in 2025 This day in weather history Warnings in Colorado, August 2025

Sources

NOAA National Centers for Environmental Information, Storm Events Database, compiled from the National Weather Service’s monthly Storm Data. Complete through 2026-06; NCEI adds each month about 75 days after it ends and revises past years a few times a year. Rebuilt 2026-10-01. Each event’s entry at NCEI: 1282493, 1282494, 1282495, 1282496, 1282497, 1282498, 1282499.