Alert archive / Colorado / Flash Flood Warnings
Flash Flood Warnings in Colorado, 2022
204 flash flood warnings in 2022. 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 2022. Tap one for its archive.
- Flash Flood Warnings
- 204
- Busiest month
- August98 flash flood warnings
- Busiest day
- August 15, 202213 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.
50 of 204 flash flood warnings covering Colorado in 2022 had a flash flood report inside them; 86 of 115 flash flood reports fell inside a warning, on average 55 minutes after it went out.
Colorado, 2022
| Warnings | With a report | False alarm ratio | Reports | Inside a warning | Mean lead time | |
|---|---|---|---|---|---|---|
| Flash flood warnings | 204 | 50 | 75% | 115 | 75% | 55 min |
Each office's whole area, 2022
| Warnings | With a report | False alarm ratio | Reports | Inside a warning | Mean lead time | |
|---|---|---|---|---|---|---|
| NWS Grand Junction, CO: flash flood warnings | 61 | 12 | 80% | 38 | 63% | 45 min |
| NWS Cheyenne, WY: flash flood warnings | 11 | 8 | 27% | 13 | 92% | 51 min |
| NWS Denver/Boulder, CO: flash flood warnings | 63 | 17 | 73% | 38 | 76% | 62 min |
| NWS Pueblo, CO: flash flood warnings | 89 | 26 | 71% | 51 | 86% | 58 min |
| NWS Goodland, KS: flash flood warnings | 9 | 0 | 100% | 7 | 0% |
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 3, 2:49 PM MDT | Flash Flood Warning | BOU | Larimer | 107 min |
| Jun 3, 5:40 PM MDT | Flash Flood Warning | GLD | Yuma | 2 hr |
| Jun 6, 5:57 PM MDT | Flash Flood Warning | PUB | Prowers | 102 min |
| Jun 7, 11:59 PM MDT | Flash Flood Warning | PUB | Bent, Prowers | 3 hr |
| Jun 16, 10:50 PM MDT | Flash Flood Warning | BOU | Larimer | 3 hr |
| Jun 17, 11:37 AM MDT | Flash Flood Warning | PUB | Costilla, Huerfano | 3 hr |
| Jun 19, 2:41 PM MDT | Flash Flood Warning | BOU | Larimer | 3 hr |
| Jun 25, 7:51 PM MDT | Flash Flood Warning | PUB | Chaffee | 117 min |
| Jun 27, 4:47 PM MDT | Flash Flood Warning | PUB | Custer, Fremont, Saguache | 2 hr |
| Jun 27, 6:20 PM MDT | Flash Flood Warning | GJT | Eagle, Garfield | 84 min |
| Jun 29, 5:36 PM MDT | Flash Flood Warning | GJT | Eagle, Garfield | 4 hr |
| Jun 30, 2:29 PM MDT | Flash Flood Warning | PUB | Chaffee | 2 hr |
| Jul 1, 12:13 PM MDT | Flash Flood Warning | PUB | Chaffee | 3 hr |
| Jul 1, 1:18 PM MDT | Flash Flood Warning | PUB | Fremont | 2 hr |
| Jul 1, 2:08 PM MDT | Flash Flood Warning | PUB | Las Animas | 3 hr |
| Jul 1, 4:39 PM MDT | Flash Flood Warning | PUB | Las Animas | 3 hr |
| Jul 1, 4:41 PM MDT | Flash Flood Warning | PUB | Costilla, Huerfano | 80 min |
| Jul 2, 4:58 PM MDT | Flash Flood Warning | PUB | El Paso, Fremont, Pueblo | 3 hr |
| Jul 3, 1:21 PM MDT | Flash Flood Warning | BOU | Larimer | 3 hr |
| Jul 3, 1:59 PM MDT | Flash Flood Warning | BOU | Larimer | 3 hr |
| Jul 3, 4:03 PM MDT | Flash Flood Warning | BOU | Boulder | 82 min |
| Jul 5, 1:12 PM MDT | Flash Flood Warning | BOU | Grand | 3 hr |
| Jul 5, 1:31 PM MDT | Flash Flood Warning | BOU | Grand | 3 hr |
| Jul 5, 1:34 PM MDT | Flash Flood Warning | BOU | Larimer | 3 hr |
| Jul 5, 1:43 PM MDT | Flash Flood Warning | BOU | Larimer | 3 hr |
| Jul 5, 3:13 PM MDT | Flash Flood Warning | GJT | Eagle, Garfield | 107 min |
| Jul 6, 2:57 PM MDT | Flash Flood Warning | BOU | Larimer | 3 hr |
| Jul 6, 3:25 PM MDT | Flash Flood Warning | PUB | Chaffee | 101 min |
| Jul 6, 3:30 PM MDT | Flash Flood Warning | GJT | San Miguel | 2 hr |
| Jul 6, 4:01 PM MDT | Flash Flood Warning | PUB | Chaffee | 65 min |
| Jul 6, 4:57 PM MDT | Flash Flood Warning | BOU | Boulder | 3 hr |
| Jul 6, 5:20 PM MDT | Flash Flood Warning | PUB | El Paso | 3 hr |
| Jul 6, 6:50 PM MDT | Flash Flood Warning | BOU | Larimer | 3 hr |
| Jul 6, 7:54 PM MDT | Flash Flood Warning | PUB | Crowley, Otero | 3 hr |
| Jul 6, 9:23 PM MDT | Flash Flood Warning | PUB | Bent, Kiowa | 3 hr |
| Jul 6, 9:52 PM MDT | Flash Flood Warning | GLD | Cheyenne | 3 hr |
| Jul 6, 10:42 PM MDT | Flash Flood Warning | PUB | Kiowa | 77 min |
| Jul 7, 12:33 PM MDT | Flash Flood Warning | BOU | Larimer | 3 hr |
| Jul 7, 12:42 PM MDT | Flash Flood Warning | BOU | Grand | 104 min |
| Jul 7, 2:41 PM MDT | Flash Flood Warning | BOU | Boulder | 53 min |
| Jul 7, 2:54 PM MDT | Flash Flood Warning | BOU | Larimer | 108 min |
| Jul 7, 9:08 PM MDT | Flash Flood Warning | GLD | Cheyenne | 8 hr |
| Jul 8, 6:32 PM MDT | Flash Flood Warning | BOU | Larimer | 78 min |
| Jul 10, 1:28 PM MDT | Flash Flood Warning | GJT | Ouray | 107 min |
| Jul 11, 3:16 PM MDT | Flash Flood Warning | PUB | Fremont, Saguache | 3 hr |
| Jul 11, 3:20 PM MDT | Flash Flood Warning | GJT | San Juan, San Miguel | 2 hr |
| Jul 11, 4:44 PM MDT | Flash Flood Warning | PUB | Costilla, Huerfano | 3 hr |
| Jul 11, 5:31 PM MDT | Flash Flood Warning | PUB | Huerfano | 3 hr |
| Jul 11, 5:53 PM MDT | Flash Flood Warning | PUB | Huerfano, Las Animas | 3 hr |
| Jul 12, 1:05 PM MDT | Flash Flood Warning | PUB | Chaffee | 3 hr |
| Jul 12, 3:49 PM MDT | Flash Flood Warning | PUB | Costilla, Huerfano | 3 hr |
| Jul 13, 4:19 PM MDT | Flash Flood Warning | BOU | Grand, Jackson | 2 hr |
| Jul 15, 12:36 PM MDT | Flash Flood Warning | GJT | Eagle, Garfield | 54 min |
| Jul 15, 3:52 PM MDT | Flash Flood Warning | BOU | Larimer | 3 hr |
| Jul 15, 5:12 PM MDT | Flash Flood Warning | GJT | San Miguel | 3 hr |
| Jul 15, 5:37 PM MDT | Flash Flood Warning | BOU | Larimer | 2 hr |
| Jul 15, 6:07 PM MDT | Flash Flood Warning | GJT | Mesa | 3 hr |
| Jul 16, 1:15 PM MDT | Flash Flood Warning | BOU | Grand | 3 hr |
| Jul 16, 2:12 PM MDT | Flash Flood Warning | GJT | Eagle, Garfield | 33 min |
| Jul 19, 4:34 PM MDT | Flash Flood Warning | GJT | Garfield, Mesa | 116 min |
| Jul 20, 2:12 PM MDT | Flash Flood Warning | PUB | Custer, Pueblo | 2 hr |
| Jul 20, 2:47 PM MDT | Flash Flood Warning | PUB | El Paso, Pueblo | 87 min |
| Jul 20, 3:21 PM MDT | Flash Flood Warning | BOU | Grand | 3 hr |
| Jul 20, 4:52 PM MDT | Flash Flood Warning | GJT | Eagle, Garfield, Pitkin | 53 min |
| Jul 23, 3:15 PM MDT | Flash Flood Warning | BOU | Larimer | 117 min |
| Jul 23, 7:13 PM MDT | Flash Flood Warning | PUB | Prowers | 3 hr |
| Jul 23, 7:50 PM MDT | Flash Flood Warning | BOU | Boulder | 2 hr |
| Jul 24, 2:23 PM MDT | Flash Flood Warning | BOU | Larimer | 3 hr |
| Jul 24, 4:22 PM MDT | Flash Flood Warning | BOU | Morgan | 3 hr |
| Jul 24, 5:36 PM MDT | Flash Flood Warning | PUB | El Paso | 84 min |
| Jul 24, 6:30 PM MDT | Flash Flood Warning | GJT | Eagle, Garfield | 2 hr |
| Jul 24, 7:11 PM MDT | Flash Flood Warning | GLD | Cheyenne, Kit Carson | 3 hr |
| Jul 25, 4:07 PM MDT | Flash Flood Warning | PUB | El Paso | 118 min |
| Jul 25, 8:32 PM MDT | Flash Flood Warning | PUB | El Paso, Pueblo | 108 min |
| Jul 26, 5:10 PM MDT | Flash Flood Warning | PUB | Pueblo | 3 hr |
| Jul 26, 5:38 PM MDT | Flash Flood Warning | PUB | El Paso | 3 hr |
| Jul 26, 5:53 PM MDT | Flash Flood Warning | PUB | Costilla | 3 hr |
| Jul 26, 6:04 PM MDT | Flash Flood Warning | PUB | El Paso, Teller | 3 hr |
| Jul 26, 6:28 PM MDT | Flash Flood Warning | PUB | El Paso, Teller | 3 hr |
| Jul 26, 6:57 PM MDT | Flash Flood Warning | PUB | El Paso | 3 hr |
| Jul 26, 8:26 PM MDT | Flash Flood Warning | PUB | El Paso | 3 hr |
| Jul 27, 1:23 PM MDT | Flash Flood Warning | PUB | Huerfano | 3 hr |
| Jul 27, 8:25 PM MDT | Flash Flood Warning | BOU | Park | 3 hr |
| Jul 27, 8:29 PM MDT | Flash Flood Warning | BOU | Larimer | 3 hr |
| Jul 27, 8:37 PM MDT | Flash Flood Warning | BOU | Larimer | 3 hr |
| Jul 27, 10:02 PM MDT | Flash Flood Warning | BOU | Boulder | 81 min |
| Jul 27, 10:36 PM MDT | Flash Flood Warning | BOU | Boulder | 96 min |
| Jul 27, 10:48 PM MDT | Flash Flood Warning | BOU | Logan, Washington | 117 min |
| Jul 28, 12:02 AM MDT | Flash Flood Warning | BOU | Washington | 118 min |
| Jul 28, 1:18 AM MDT | Flash Flood Warning | BOU | Washington | 117 min |
| Jul 28, 5:08 AM MDT | Flash Flood Warning | PUB | Custer, Pueblo | 2 hr |
| Jul 28, 1:23 PM MDT | Flash Flood Warning | PUB | Costilla, Huerfano | 112 min |
| Jul 28, 2:49 PM MDT | Flash Flood Warning | BOU | Larimer | 3 hr |
| Jul 28, 3:46 PM MDT | Flash Flood Warning | BOU | Grand | 3 hr |
| Jul 29, 12:27 PM MDT | Flash Flood Warning | BOU | Grand | 2 hr |
| Jul 29, 12:50 PM MDT | Flash Flood Warning | BOU | Larimer | 3 hr |
| Jul 29, 6:04 PM MDT | Flash Flood Warning | PUB | El Paso | 2 hr |
| Jul 29, 6:36 PM MDT | Flash Flood Warning | PUB | El Paso | 3 hr |
| Jul 29, 7:28 PM MDT | Flash Flood Warning | PUB | El Paso | 2 hr |
| Jul 29, 9:08 PM MDT | Flash Flood Warning | PUB | Fremont, Pueblo | 112 min |
| Jul 30, 2:57 PM MDT | Flash Flood Warning | GJT | Garfield, Mesa | 3 hr |
| Jul 30, 4:43 PM MDT | Flash Flood Warning | PUB | Baca | 2 hr |
| Jul 30, 5:19 PM MDT | Flash Flood Warning | GJT | Gunnison, Pitkin | 3 hr |
| Jul 31, 12:36 PM MDT | Flash Flood Warning | BOU | Larimer | 3 hr |
| Jul 31, 1:02 PM MDT | Flash Flood Warning | BOU | Grand | 2 hr |
| Aug 1, 3:12 PM MDT | Flash Flood Warning | GJT | Archuleta, Hinsdale, La Plata | 2 hr |
| Aug 1, 4:43 PM MDT | Flash Flood Warning | PUB | Custer, Fremont, Saguache | 3 hr |
| Aug 1, 4:57 PM MDT | Flash Flood Warning | PUB | Costilla | 3 hr |
| Aug 1, 5:20 PM MDT | Flash Flood Warning | PUB | Chaffee, Fremont | 115 min |
| Aug 1, 5:26 PM MDT | Flash Flood Warning | GJT | Gunnison, Pitkin | 2 hr |
| Aug 2, 4:52 PM MDT | Flash Flood Warning | GJT | Archuleta | 3 hr |
| Aug 2, 5:23 PM MDT | Flash Flood Warning | GJT | Garfield, Mesa | 3 hr |
| Aug 2, 7:22 PM MDT | Flash Flood Warning | GJT | Moffat, Routt | 95 min |
| Aug 3, 2:31 PM MDT | Flash Flood Warning | PUB | Custer | 3 hr |
| Aug 3, 3:35 PM MDT | Flash Flood Warning | PUB | Fremont | 3 hr |
| Aug 3, 4:18 PM MDT | Flash Flood Warning | PUB | Fremont | 3 hr |
| Aug 3, 5:21 PM MDT | Flash Flood Warning | PUB | Chaffee, Saguache | 3 hr |
| Aug 3, 5:32 PM MDT | Flash Flood Warning | PUB | Huerfano | 3 hr |
| Aug 3, 5:45 PM MDT | Flash Flood Warning | PUB | Costilla, Huerfano | 3 hr |
| Aug 3, 6:28 PM MDT | Flash Flood Warning | PUB | Huerfano | 3 hr |
| Aug 4, 1:53 PM MDT | Flash Flood Warning | GJT | San Miguel | 3 hr |
| Aug 4, 2:24 PM MDT | Flash Flood Warning | PUB | Costilla, Huerfano | 3 hr |
| Aug 4, 2:45 PM MDT | Flash Flood Warning | GJT | San Miguel | 2 hr |
| Aug 4, 3:06 PM MDT | Flash Flood Warning | GJT | Montrose | 3 hr |
| Aug 4, 3:34 PM MDT | Flash Flood Warning | GJT | Dolores, San Miguel | 3 hr |
| Aug 4, 4:11 PM MDT | Flash Flood Warning | GJT | Archuleta, Hinsdale, La Plata | 3 hr |
| Aug 4, 4:37 PM MDT | Flash Flood Warning | GJT | Dolores, Montezuma | 3 hr |
| Aug 4, 5:11 PM MDT | Flash Flood Warning | PUB | Fremont | 3 hr |
| Aug 4, 6:14 PM MDT | Flash Flood Warning | PUB | El Paso, Teller | 4 hr |
| Aug 4, 7:02 PM MDT | Flash Flood Warning | PUB | El Paso | 3 hr |
| Aug 4, 7:35 PM MDT | Flash Flood Warning | PUB | Chaffee, Saguache | 3 hr |
| Aug 4, 8:26 PM MDT | Flash Flood Warning | PUB | Chaffee, Fremont, Saguache | 3 hr |
| Aug 5, 12:35 PM MDT | Flash Flood Warning | PUB | Chaffee | 3 hr |
| Aug 5, 1:56 PM MDT | Flash Flood Warning | BOU | Larimer | 5 hr |
| Aug 5, 3:26 PM MDT | Flash Flood Warning | BOU | Larimer | 3 hr |
| Aug 5, 4:17 PM MDT | Flash Flood Warning | PUB | Fremont | 3 hr |
| Aug 5, 4:18 PM MDT | Flash Flood Warning | BOU | Larimer | 3 hr |
| Aug 5, 4:33 PM MDT | Flash Flood Warning | PUB | Saguache | 4 hr |
| Aug 5, 5:34 PM MDT | Flash Flood Warning | PUB | Custer, Fremont | 4 hr |
| Aug 6, 6:05 PM MDT | Flash Flood Warning | PUB | Bent, Crowley, Otero | 3 hr |
| Aug 6, 6:41 PM MDT | Flash Flood Warning | PUB | El Paso | 2 hr |
| Aug 7, 2:32 PM MDT | Flash Flood Warning | PUB | Costilla, Huerfano | 3 hr |
| Aug 7, 3:12 PM MDT | Flash Flood Warning | PUB | Chaffee | 3 hr |
| Aug 7, 3:32 PM MDT | Flash Flood Warning | BOU | Larimer | 3 hr |
| Aug 7, 4:56 PM MDT | Flash Flood Warning | PUB | Huerfano, Las Animas | 3 hr |
| Aug 7, 5:21 PM MDT | Flash Flood Warning | PUB | Fremont | 2 hr |
| Aug 7, 5:45 PM MDT | Flash Flood Warning | PUB | Bent, Prowers | 3 hr |
| Aug 7, 6:01 PM MDT | Flash Flood Warning | PUB | Saguache | 3 hr |
| Aug 7, 6:32 PM MDT | Flash Flood Warning | PUB | Custer, Saguache | 3 hr |
| Aug 7, 7:06 PM MDT | Flash Flood Warning | PUB | Teller | 4 hr |
| Aug 7, 7:12 PM MDT | Flash Flood Warning | PUB | Fremont | 3 hr |
| Aug 7, 7:20 PM MDT | Flash Flood Warning | BOU | Adams, Arapahoe, Denver | 3 hr |
| Aug 7, 7:51 PM MDT | Flash Flood Warning | PUB | Custer, Fremont | 3 hr |
| Aug 7, 8:26 PM MDT | Flash Flood Warning | PUB | El Paso | 2 hr |
| Aug 7, 8:40 PM MDT | Flash Flood Warning | PUB | Fremont, Pueblo | 2 hr |
| Aug 7, 9:04 PM MDT | Flash Flood Warning | PUB | Pueblo | 4 hr |
| Aug 8, 2:48 PM MDT | Flash Flood Warning | PUB | Costilla, Huerfano | 2 hr |
| Aug 8, 3:56 PM MDT | Flash Flood Warning | PUB | Fremont, Teller | 100 min |
| Aug 8, 5:30 PM MDT | Flash Flood Warning | PUB | Custer | 2 hr |
| Aug 11, 2:37 PM MDT | Flash Flood Warning | BOU | Larimer | 3 hr |
| Aug 11, 6:16 PM MDT | Flash Flood Warning | GJT | Mesa | 3 hr |
| Aug 12, 1:19 PM MDT | Flash Flood Warning | GJT | Dolores, San Miguel | 3 hr |
| Aug 13, 6:23 PM MDT | Flash Flood Warning | BOU | Larimer | 3 hr |
| Aug 14, 12:02 PM MDT | Flash Flood Warning | BOU | Larimer | 3 hr |
| Aug 14, 2:29 PM MDT | Flash Flood Warning | BOU | Larimer | 3 hr |
| Aug 14, 5:56 PM MDT | Flash Flood Warning | GJT | Eagle, Garfield | 3 hr |
| Aug 14, 6:24 PM MDT | Flash Flood Warning | GJT | Garfield, Mesa | 3 hr |
| Aug 15, 2:05 PM MDT | Flash Flood Warning | GJT | Garfield, Mesa | 102 min |
| Aug 15, 2:13 PM MDT | Flash Flood Warning | BOU | Larimer | 3 hr |
| Aug 15, 2:23 PM MDT | Flash Flood Warning | BOU | Larimer | 3 hr |
| Aug 15, 3:15 PM MDT | Flash Flood Warning | BOU | Douglas | 3 hr |
| Aug 15, 3:24 PM MDT | Flash Flood Warning | GJT | Montezuma | 3 hr |
| Aug 15, 3:46 PM MDT | Flash Flood Warning | BOU | Arapahoe, Douglas | 3 hr |
| Aug 15, 3:56 PM MDT | Flash Flood Warning | PUB | El Paso | 3 hr |
| Aug 15, 4:58 PM MDT | Flash Flood Warning | PUB | El Paso | 3 hr |
| Aug 15, 5:03 PM MDT | Flash Flood Warning | GJT | Eagle, Garfield | 3 hr |
| Aug 15, 5:10 PM MDT | Flash Flood Warning | PUB | El Paso | 3 hr |
| Aug 15, 5:11 PM MDT | Flash Flood Warning | GJT | Eagle, Garfield, Pitkin | 2 hr |
| Aug 15, 5:20 PM MDT | Flash Flood Warning | GJT | Garfield, Gunnison, Pitkin | 3 hr |
| Aug 15, 9:09 PM MDT | Flash Flood Warning | PUB | El Paso | 4 hr |
| Aug 16, 8:18 AM MDT | Flash Flood Warning | BOU | Boulder, Broomfield | 3 hr |
| Aug 16, 3:42 PM MDT | Flash Flood Warning | GJT | Garfield, Mesa | 2 hr |
| Aug 17, 3:22 PM MDT | Flash Flood Warning | GJT | San Miguel | 113 min |
| Aug 17, 3:57 PM MDT | Flash Flood Warning | GJT | San Miguel | 3 hr |
| Aug 19, 2:05 PM MDT | Flash Flood Warning | GJT | Dolores, Montrose, San Miguel | 3 hr |
| Aug 19, 2:39 PM MDT | Flash Flood Warning | GJT | Gunnison, Pitkin | 3 hr |
| Aug 19, 4:19 PM MDT | Flash Flood Warning | GJT | Delta | 3 hr |
| Aug 19, 4:27 PM MDT | Flash Flood Warning | GJT | Mesa | 3 hr |
| Aug 19, 5:37 PM MDT | Flash Flood Warning | PUB | El Paso | 2 hr |
| Aug 19, 9:58 PM MDT | Flash Flood Warning | BOU | Boulder | 3 hr |
| Aug 20, 2:46 PM MDT | Flash Flood Warning | PUB | Fremont | 86 min |
| Aug 20, 4:55 PM MDT | Flash Flood Warning | BOU | Grand | 3 hr |
| Aug 20, 9:14 PM MDT | Flash Flood Warning | GJT | Mesa | 95 min |
| Aug 21, 12:43 PM MDT | Flash Flood Warning | GJT | Garfield, Mesa | 3 hr |
| Aug 21, 1:42 PM MDT | Flash Flood Warning | GJT | Eagle, Garfield | 99 min |
| Aug 22, 3:14 PM MDT | Flash Flood Warning | BOU | Grand | 4 hr |
| Aug 23, 3:20 PM MDT | Flash Flood Warning | BOU | Larimer | 3 hr |
| Aug 23, 4:22 PM MDT | Flash Flood Warning | BOU | Grand | 3 hr |
| Aug 23, 4:41 PM MDT | Flash Flood Warning | BOU | Larimer | 3 hr |
| Aug 25, 12:15 PM MDT | Flash Flood Warning | BOU | Larimer | 3 hr |
| Aug 26, 2:09 PM MDT | Flash Flood Warning | GJT | Garfield, Mesa | 3 hr |
| Aug 27, 2:59 PM MDT | Flash Flood Warning | GJT | Gunnison, Pitkin | 3 hr |
| Aug 28, 3:48 PM MDT | Flash Flood Warning | BOU | Grand | 2 hr |
| Sep 14, 6:35 PM MDT | Flash Flood Warning | GJT | Eagle, Garfield | 94 min |
By county
Every county with at least one alert. A county page lists each alert that covered it.
- Larimer County34
- El Paso County23
- Garfield County21
- Fremont County19
- Huerfano County15
- Grand County13
- Chaffee County12
- Eagle County12
- Mesa County12
- Costilla County11
- San Miguel County10
- Custer County9
- Saguache County9
- Pueblo County9
- Boulder County8
- Pitkin County7
- Teller County5
- Gunnison County5
- Prowers County4
- Bent County4
- Las Animas County4
- Dolores County4
- Cheyenne County3
- Washington County3
- Archuleta County3
- Crowley County2
- Otero County2
- Kiowa County2
- Hinsdale County2
- La Plata County2
- Montrose County2
- Montezuma County2
- Arapahoe County2
- Douglas County2
- Yuma County1
- Ouray County1
- San Juan County1
- Jackson County1
- Morgan County1
- Kit Carson County1
The busiest days
Days with the most alerts issued, by UTC date.
Nearby
Alerts in force nowTornadoes on recordThe radar archive20212023
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.