Alert archive / Colorado / Flash Flood Warnings
Flash Flood Warnings in Colorado, 2025
119 flash flood warnings in 2025. An alert counts here when it covered any part of the state, so the counties below add up to more than the state. The archive of flash flood warnings reaches back to 1986.
Flash Flood Warnings by county
Each county as a circle sized by its count in 2025. Tap one for its archive.
- Flash Flood Warnings
- 119
- Busiest month
- July50 flash flood warnings
- Busiest day
- July 29, 20258 flash flood warnings
Over time
By month
Warning verification
How often warnings here had a storm report inside them, and how much warning the reports had.
18 of 119 flash flood warnings covering Colorado in 2025 had a flash flood report inside them; 25 of 47 flash flood reports fell inside a warning, on average 60 minutes after it went out.
Colorado, 2025
| Warnings | With a report | False alarm ratio | Reports | Inside a warning | Mean lead time | |
|---|---|---|---|---|---|---|
| Flash flood warnings | 119 | 18 | 85% | 47 | 53% | 60 min |
Each office's whole area, 2025
| Warnings | With a report | False alarm ratio | Reports | Inside a warning | Mean lead time | |
|---|---|---|---|---|---|---|
| NWS Grand Junction, CO: flash flood warnings | 44 | 10 | 77% | 31 | 48% | 73 min |
| NWS Denver/Boulder, CO: flash flood warnings | 22 | 2 | 91% | 5 | 60% | 42 min |
| NWS Goodland, KS: flash flood warnings | 16 | 2 | 88% | 5 | 80% | 132 min |
| NWS Pueblo, CO: flash flood warnings | 60 | 6 | 90% | 12 | 58% | 40 min |
An office's figures cover every county it serves, including across state lines.
Verified by the Iowa Environmental Mesonet's Cow, which matches each storm-based warning with the local storm reports inside its polygon while it was in force, within 15 km of its edge: a tornado warning counts as verified on a tornado report, a severe thunderstorm warning on hail of 1 inch or more, a gust of 58 mph or more, or wind damage, a flash flood warning on a flash flood report. The false alarm ratio is the share of warnings with no such report; "inside a warning" is the probability of detection, the share of reports that fell inside one; lead time runs from the warning's issue to each report inside it, counting zero for a report that came first. A warning with no report is not proof nothing happened: reports come from spotters, the public and damage surveys, and are thin where few people live.
The alerts
Every alert, in the order issued. Times are local, Mountain Time. Each opens its own page with the text, the map, the radar and the sounding.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Jun 2, 6:15 PM MDT | Flash Flood Warning | BOU | Larimer | 93 min |
| Jun 2, 6:15 PM MDT | Flash Flood Warning | BOU | Larimer | 93 min |
| Jun 4, 12:03 PM MDT | Flash Flood Warning | GJT | Mesa | 87 min |
| Jun 5, 1:46 PM MDT | Flash Flood Warning | PUB | El Paso | 3 hr |
| Jun 5, 4:52 PM MDT | Flash Flood Warning | BOU | Douglas, Elbert | 60 min |
| Jun 17, 11:40 AM MDT | Flash Flood Warning | BOU | Larimer | 3 hr |
| Jun 24, 4:24 PM MDT | Flash Flood Warning | PUB | Pueblo | 84 min |
| Jun 25, 2:01 PM MDT | Flash Flood Warning | PUB | El Paso | 3 hr |
| Jun 25, 6:41 PM MDT | Flash Flood Warning | BOU | Boulder, Weld | 2 hr |
| Jul 6, 7:06 PM MDT | Flash Flood Warning | PUB | El Paso | 114 min |
| Jul 11, 7:15 PM MDT | Flash Flood Warning | PUB | Otero, Pueblo | 3 hr |
| Jul 11, 7:19 PM MDT | Flash Flood Warning | BOU | Morgan, Weld | 3 hr |
| Jul 12, 5:53 PM MDT | Flash Flood Warning | PUB | Costilla, Huerfano | 3 hr |
| Jul 13, 7:59 PM MDT | Flash Flood Warning | PUB | Chaffee, Fremont, Saguache | 3 hr |
| Jul 16, 2:19 PM MDT | Flash Flood Warning | PUB | El Paso | 3 hr |
| Jul 16, 4:47 PM MDT | Flash Flood Warning | PUB | El Paso | 3 hr |
| Jul 16, 6:26 PM MDT | Flash Flood Warning | PUB | Huerfano, Pueblo | 3 hr |
| Jul 16, 10:02 PM MDT | Flash Flood Warning | BOU | Boulder, Broomfield, Jefferson | 118 min |
| Jul 16, 10:19 PM MDT | Flash Flood Warning | BOU | Adams | 3 hr |
| Jul 17, 5:48 PM MDT | Flash Flood Warning | PUB | El Paso, Fremont, Teller | 3 hr |
| Jul 18, 2:33 PM MDT | Flash Flood Warning | PUB | Las Animas | 2 hr |
| Jul 20, 8:42 PM MDT | Flash Flood Warning | BOU | Lincoln | 3 hr |
| Jul 20, 10:03 PM MDT | Flash Flood Warning | GLD | Cheyenne, Kit Carson | 4 hr |
| Jul 21, 1:34 PM MDT | Flash Flood Warning | PUB | Chaffee | 4 hr |
| Jul 21, 6:52 PM MDT | Flash Flood Warning | BOU | Elbert | 3 hr |
| Jul 22, 4:09 PM MDT | Flash Flood Warning | BOU | Larimer | 3 hr |
| Jul 23, 2:22 PM MDT | Flash Flood Warning | PUB | Rio Grande, Saguache | 3 hr |
| Jul 23, 2:28 PM MDT | Flash Flood Warning | BOU | Larimer | 3 hr |
| Jul 23, 3:40 PM MDT | Flash Flood Warning | PUB | Fremont | 3 hr |
| Jul 23, 4:08 PM MDT | Flash Flood Warning | PUB | Alamosa, Custer, Huerfano, Saguache | 3 hr |
| Jul 23, 5:46 PM MDT | Flash Flood Warning | PUB | Costilla | 3 hr |
| Jul 23, 6:52 PM MDT | Flash Flood Warning | BOU | Douglas | 3 hr |
| Jul 23, 7:54 PM MDT | Flash Flood Warning | BOU | Adams, Arapahoe, Denver | 3 hr |
| Jul 24, 1:23 PM MDT | Flash Flood Warning | BOU | Larimer | 3 hr |
| Jul 24, 2:52 PM MDT | Flash Flood Warning | PUB | Custer, Fremont, Saguache | 2 hr |
| Jul 24, 4:51 PM MDT | Flash Flood Warning | PUB | Custer, Pueblo | 84 min |
| Jul 24, 6:01 PM MDT | Flash Flood Warning | PUB | Pueblo | 3 hr |
| Jul 24, 6:21 PM MDT | Flash Flood Warning | PUB | El Paso, Pueblo | 3 hr |
| Jul 24, 8:25 PM MDT | Flash Flood Warning | BOU | Arapahoe, Elbert | 3 hr |
| Jul 29, 2:46 PM MDT | Flash Flood Warning | PUB | El Paso | 3 hr |
| Jul 29, 2:56 PM MDT | Flash Flood Warning | PUB | Pueblo | 94 min |
| Jul 29, 3:06 PM MDT | Flash Flood Warning | PUB | Huerfano, Las Animas | 3 hr |
| Jul 29, 3:22 PM MDT | Flash Flood Warning | PUB | Pueblo | 3 hr |
| Jul 29, 3:56 PM MDT | Flash Flood Warning | PUB | Pueblo | 3 hr |
| Jul 29, 4:10 PM MDT | Flash Flood Warning | PUB | Huerfano, Pueblo | 3 hr |
| Jul 29, 4:47 PM MDT | Flash Flood Warning | PUB | Custer, Pueblo | 3 hr |
| Jul 29, 5:33 PM MDT | Flash Flood Warning | PUB | Pueblo | 2 hr |
| Jul 30, 2:49 PM MDT | Flash Flood Warning | PUB | El Paso | 2 hr |
| Jul 30, 2:52 PM MDT | Flash Flood Warning | PUB | Saguache | 3 hr |
| Jul 30, 3:04 PM MDT | Flash Flood Warning | PUB | El Paso, Teller | 114 min |
| Jul 30, 3:10 PM MDT | Flash Flood Warning | PUB | Saguache | 3 hr |
| Jul 30, 3:26 PM MDT | Flash Flood Warning | PUB | El Paso | 92 min |
| Jul 30, 3:51 PM MDT | Flash Flood Warning | GJT | Delta, Mesa, Montrose | 39 min |
| Jul 30, 4:27 PM MDT | Flash Flood Warning | PUB | Fremont | 3 hr |
| Jul 30, 5:53 PM MDT | Flash Flood Warning | PUB | Chaffee, Fremont | 2 hr |
| Jul 30, 6:08 PM MDT | Flash Flood Warning | PUB | Costilla, Huerfano, Las Animas | 3 hr |
| Jul 31, 4:06 PM MDT | Flash Flood Warning | PUB | Custer, Huerfano | 113 min |
| Jul 31, 5:30 PM MDT | Flash Flood Warning | PUB | Fremont | 75 min |
| Jul 31, 5:45 PM MDT | Flash Flood Warning | PUB | El Paso | 3 hr |
| Jul 31, 6:18 PM MDT | Flash Flood Warning | BOU | Weld | 3 hr |
| Jul 31, 6:58 PM MDT | Flash Flood Warning | PUB | El Paso, Pueblo | 3 hr |
| Jul 31, 7:49 PM MDT | Flash Flood Warning | PUB | Fremont | 102 min |
| Jul 31, 9:20 PM MDT | Flash Flood Warning | BOU | Adams | 4 hr |
| Jul 31, 10:37 PM MDT | Flash Flood Warning | BOU | Adams | 3 hr |
| Aug 1, 3:10 PM MDT | Flash Flood Warning | PUB | Las Animas | 3 hr |
| Aug 1, 3:15 PM MDT | Flash Flood Warning | PUB | Conejos | 104 min |
| Aug 4, 5:43 PM MDT | Flash Flood Warning | PUB | Bent | 3 hr |
| Aug 10, 2:20 PM MDT | Flash Flood Warning | PUB | Las Animas | 115 min |
| Aug 16, 1:36 PM MDT | Flash Flood Warning | GJT | Garfield, Rio Blanco | 114 min |
| Aug 19, 1:45 PM MDT | Flash Flood Warning | PUB | El Paso | 90 min |
| Aug 19, 5:11 PM MDT | Flash Flood Warning | PUB | Custer, Pueblo | 2 hr |
| Aug 22, 5:26 PM MDT | Flash Flood Warning | GJT | Montrose | 2 hr |
| Aug 23, 2:44 PM MDT | Flash Flood Warning | GJT | Montrose | 2 hr |
| Aug 23, 2:53 PM MDT | Flash Flood Warning | GJT | Mesa | 3 hr |
| Aug 23, 4:57 PM MDT | Flash Flood Warning | PUB | Costilla, Huerfano, Las Animas | 2 hr |
| Aug 24, 12:17 PM MDT | Flash Flood Warning | GJT | Garfield, Rio Blanco | 118 min |
| Aug 24, 3:24 PM MDT | Flash Flood Warning | PUB | El Paso | 92 min |
| Aug 24, 6:19 PM MDT | Flash Flood Warning | BOU | Elbert | 3 hr |
| Aug 24, 8:38 PM MDT | Flash Flood Warning | PUB | Otero | 3 hr |
| Aug 25, 6:59 AM MDT | Flash Flood Warning | GJT | Garfield, Rio Blanco | 91 min |
| Aug 25, 2:46 PM MDT | Flash Flood Warning | PUB | El Paso | 104 min |
| Aug 25, 3:35 PM MDT | Flash Flood Warning | PUB | El Paso | 3 hr |
| Aug 25, 5:28 PM MDT | Flash Flood Warning | PUB | El Paso | 2 hr |
| Aug 25, 5:35 PM MDT | Flash Flood Warning | PUB | Las Animas | 3 hr |
| Aug 25, 7:22 PM MDT | Flash Flood Warning | GJT | Mesa | 68 min |
| Aug 26, 4:59 AM MDT | Flash Flood Warning | GJT | Rio Blanco | 66 min |
| Aug 26, 1:04 PM MDT | Flash Flood Warning | GJT | Rio Blanco | 3 hr |
| Aug 26, 1:51 PM MDT | Flash Flood Warning | GJT | Rio Blanco | 3 hr |
| Aug 26, 4:14 PM MDT | Flash Flood Warning | PUB | Custer | 2 hr |
| Aug 26, 5:03 PM MDT | Flash Flood Warning | GJT | Montrose | 3 hr |
| Aug 26, 6:37 PM MDT | Flash Flood Warning | BOU | Arapahoe, Elbert | 3 hr |
| Aug 26, 7:14 PM MDT | Flash Flood Warning | GJT | Delta, Mesa, Montrose | 2 hr |
| Aug 26, 7:38 PM MDT | Flash Flood Warning | PUB | Otero, Pueblo | 3 hr |
| Aug 26, 9:40 PM MDT | Flash Flood Warning | GJT | Delta, Mesa, Montrose | 3 hr |
| Aug 27, 1:40 PM MDT | Flash Flood Warning | BOU | Larimer | 3 hr |
| Aug 27, 5:36 PM MDT | Flash Flood Warning | GJT | Rio Blanco | 3 hr |
| Aug 28, 2:51 PM MDT | Flash Flood Warning | GJT | Rio Blanco | 114 min |
| Aug 29, 5:20 PM MDT | Flash Flood Warning | PUB | Baca | 3 hr |
| Sep 4, 1:28 PM MDT | Flash Flood Warning | GJT | Garfield, Rio Blanco | 2 hr |
| Sep 6, 12:48 PM MDT | Flash Flood Warning | GJT | Rio Blanco | 117 min |
| Sep 7, 5:50 PM MDT | Flash Flood Warning | GJT | Rio Blanco | 91 min |
| Sep 9, 12:52 PM MDT | Flash Flood Warning | GJT | Rio Blanco | 113 min |
| Sep 11, 2:06 PM MDT | Flash Flood Warning | GJT | Dolores, Montezuma | 58 min |
| Sep 11, 2:44 PM MDT | Flash Flood Warning | GJT | Rio Blanco | 2 hr |
| Sep 12, 11:42 AM MDT | Flash Flood Warning | GJT | Rio Blanco | 3 hr |
| Sep 12, 4:13 PM MDT | Flash Flood Warning | GJT | Rio Blanco | 70 min |
| Sep 13, 12:11 PM MDT | Flash Flood Warning | GJT | Mesa | 4 hr |
| Sep 13, 1:42 PM MDT | Flash Flood Warning | GJT | Rio Blanco | 93 min |
| Sep 13, 2:23 PM MDT | Flash Flood Warning | GJT | Rio Blanco | 112 min |
| Sep 13, 2:36 PM MDT | Flash Flood Warning | GJT | Montezuma | 3 hr |
| Sep 16, 3:50 PM MDT | Flash Flood Warning | PUB | Baca | 3 hr |
| Sep 16, 4:50 PM MDT | Flash Flood Warning | GJT | Rio Blanco | 85 min |
| Sep 17, 11:27 PM MDT | Flash Flood Warning | PUB | Prowers | 2 hr |
| Sep 22, 3:15 PM MDT | Flash Flood Warning | GJT | Rio Blanco | 3 hr |
| Sep 22, 4:02 PM MDT | Flash Flood Warning | GJT | Rio Blanco | 4 hr |
| Sep 28, 7:34 PM MDT | Flash Flood Warning | GJT | Rio Blanco | 86 min |
| Oct 4, 11:48 AM MDT | Flash Flood Warning | GJT | Mesa | 117 min |
| Oct 4, 12:42 PM MDT | Flash Flood Warning | GJT | Garfield, Rio Blanco | 2 hr |
| Oct 15, 5:34 PM MDT | Flash Flood Warning | GJT | Archuleta | 3 hr |
By county
Every county with at least one alert. A county page lists each alert that covered it.
- Rio Blanco County22
- El Paso County18
- Pueblo County15
- Mesa County8
- Huerfano County8
- Fremont County8
- Larimer County7
- Las Animas County7
- Custer County7
- Saguache County6
- Montrose County6
- Elbert County5
- Garfield County5
- Costilla County4
- Adams County4
- Weld County3
- Otero County3
- Chaffee County3
- Arapahoe County3
- Delta County3
- Douglas County2
- Boulder County2
- Teller County2
- Baca County2
- Montezuma County2
- Morgan County1
- Broomfield County1
- Jefferson County1
- Lincoln County1
- Cheyenne County1
- Kit Carson County1
- Rio Grande County1
- Alamosa County1
- Denver County1
- Conejos County1
- Bent County1
- Dolores County1
- Prowers County1
- Archuleta County1
The busiest days
Days with the most alerts issued, by UTC date.
Nearby
Alerts in force nowTornadoes on recordThe radar archive20242026
Sources
National Weather Service watches, warnings, advisories and statements from the Iowa Environmental Mesonet's VTEC archive, which reconstructs tornado, severe thunderstorm, flash flood and marine warnings back to 1986 from the NWS text archive. Storm Prediction Center watches and mesoscale discussions from SPC's archive through the Mesonet. County centers from the US Census Bureau. Warning verification from the Mesonet's Cow. Rebuilt daily.