Alert archive / Colorado / Flash Flood Warnings
Flash Flood Warnings in Colorado, 2010
81 flash flood warnings in 2010. 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 2010. Tap one for its archive.
- Flash Flood Warnings
- 81
- Busiest month
- July41 flash flood warnings
- Busiest day
- July 31, 201013 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.
16 of 81 flash flood warnings covering Colorado in 2010 had a flash flood report inside them; 22 of 32 flash flood reports fell inside a warning, on average 52 minutes after it went out.
Colorado, 2010
| Warnings | With a report | False alarm ratio | Reports | Inside a warning | Mean lead time | |
|---|---|---|---|---|---|---|
| Flash flood warnings | 81 | 16 | 80% | 32 | 69% | 52 min |
Each office's whole area, 2010
| Warnings | With a report | False alarm ratio | Reports | Inside a warning | Mean lead time | |
|---|---|---|---|---|---|---|
| NWS Grand Junction, CO: flash flood warnings | 20 | 3 | 85% | 10 | 40% | 60 min |
| NWS Goodland, KS: flash flood warnings | 34 | 13 | 62% | 27 | 67% | 99 min |
| NWS Pueblo, CO: flash flood warnings | 37 | 8 | 78% | 13 | 77% | 32 min |
| NWS Denver/Boulder, CO: flash flood warnings | 22 | 3 | 86% | 6 | 100% | 50 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 |
|---|---|---|---|---|
| Jan 21, 7:24 PM MST | Flash Flood Warning | GJT | Montezuma | 4 hr |
| Apr 22, 5:31 PM MDT | Flash Flood Warning | GLD | Cheyenne, Kit Carson, Yuma | 3 hr |
| May 26, 4:04 PM MDT | Flash Flood Warning | PUB | Pueblo | 2 hr |
| May 26, 8:58 PM MDT | Flash Flood Warning | BOU | Weld | 2 hr |
| Jun 6, 7:20 PM MDT | Flash Flood Warning | BOU | Morgan | 2 hr |
| Jun 9, 4:09 PM MDT | Flash Flood Warning | PUB | Las Animas | 3 hr |
| Jun 11, 5:32 PM MDT | Flash Flood Warning | BOU | Morgan, Weld | 3 hr |
| Jun 11, 5:49 PM MDT | Flash Flood Warning | PUB | Crowley, Huerfano, Las Animas, Otero, Pueblo | 2 hr |
| Jun 11, 6:17 PM MDT | Flash Flood Warning | BOU | Elbert, Lincoln | 3 hr |
| Jun 11, 7:35 PM MDT | Flash Flood Warning | BOU | Logan, Morgan, Washington | 4 hr |
| Jun 11, 8:27 PM MDT | Flash Flood Warning | BOU | Phillips, Sedgwick | 2 hr |
| Jun 11, 8:32 PM MDT | Flash Flood Warning | BOU | Morgan, Weld | 3 hr |
| Jun 19, 1:19 AM MDT | Flash Flood Warning | BOU | Morgan | 3 hr |
| Jun 19, 2:43 AM MDT | Flash Flood Warning | BOU | Phillips | 3 hr |
| Jul 2, 6:22 PM MDT | Flash Flood Warning | GLD | Kit Carson, Yuma | 3 hr |
| Jul 3, 4:54 PM MDT | Flash Flood Warning | PUB | Baca | 3 hr |
| Jul 4, 5:12 PM MDT | Flash Flood Warning | BOU | Elbert | 3 hr |
| Jul 4, 6:45 PM MDT | Flash Flood Warning | BOU | Larimer | 2 hr |
| Jul 4, 7:55 PM MDT | Flash Flood Warning | PUB | El Paso, Teller | 3 hr |
| Jul 4, 8:31 PM MDT | Flash Flood Warning | BOU | Elbert, Lincoln | 2 hr |
| Jul 4, 10:18 PM MDT | Flash Flood Warning | GLD | Cheyenne, Kit Carson | 6 hr |
| Jul 4, 10:41 PM MDT | Flash Flood Warning | PUB | El Paso, Teller | 2 hr |
| Jul 4, 11:37 PM MDT | Flash Flood Warning | GLD | Kit Carson | 5 hr |
| Jul 6, 7:27 PM MDT | Flash Flood Warning | BOU | Adams, Arapahoe, Elbert | 2 hr |
| Jul 7, 5:37 PM MDT | Flash Flood Warning | PUB | El Paso | 81 min |
| Jul 8, 3:09 PM MDT | Flash Flood Warning | PUB | El Paso | 3 hr |
| Jul 8, 5:29 PM MDT | Flash Flood Warning | GLD | Kit Carson | 5 hr |
| Jul 8, 7:07 PM MDT | Flash Flood Warning | GLD | Kit Carson | 3 hr |
| Jul 10, 5:28 PM MDT | Flash Flood Warning | PUB | Las Animas | 3 hr |
| Jul 20, 6:43 PM MDT | Flash Flood Warning | PUB | El Paso | 99 min |
| Jul 20, 7:36 PM MDT | Flash Flood Warning | PUB | El Paso | 3 hr |
| Jul 21, 1:47 PM MDT | Flash Flood Warning | BOU | Larimer | 65 min |
| Jul 21, 5:08 PM MDT | Flash Flood Warning | GJT | Dolores, Montrose, San Juan, San Miguel | 3 hr |
| Jul 25, 7:10 AM MDT | Flash Flood Warning | PUB | Huerfano, Las Animas | 3 hr |
| Jul 25, 9:49 AM MDT | Flash Flood Warning | PUB | Huerfano, Las Animas | 3 hr |
| Jul 26, 5:44 PM MDT | Flash Flood Warning | GJT | Dolores, San Miguel | 3 hr |
| Jul 27, 3:34 PM MDT | Flash Flood Warning | GJT | Montrose, San Miguel | 3 hr |
| Jul 28, 3:55 PM MDT | Flash Flood Warning | BOU | Boulder | 3 hr |
| Jul 29, 1:38 PM MDT | Flash Flood Warning | BOU | Douglas | 112 min |
| Jul 30, 3:00 PM MDT | Flash Flood Warning | PUB | Fremont | 119 min |
| Jul 30, 3:12 PM MDT | Flash Flood Warning | PUB | Crowley | 108 min |
| Jul 30, 5:50 PM MDT | Flash Flood Warning | PUB | Chaffee, Fremont | 3 hr |
| Jul 30, 8:40 PM MDT | Flash Flood Warning | PUB | Huerfano | 3 hr |
| Jul 30, 9:41 PM MDT | Flash Flood Warning | PUB | Pueblo | 3 hr |
| Jul 30, 10:07 PM MDT | Flash Flood Warning | PUB | Las Animas | 3 hr |
| Jul 31, 12:27 AM MDT | Flash Flood Warning | PUB | Pueblo | 3 hr |
| Jul 31, 1:21 AM MDT | Flash Flood Warning | PUB | Las Animas | 87 min |
| Jul 31, 3:29 AM MDT | Flash Flood Warning | PUB | Pueblo | 3 hr |
| Jul 31, 12:57 PM MDT | Flash Flood Warning | GJT | Mesa | 3 hr |
| Jul 31, 1:26 PM MDT | Flash Flood Warning | PUB | Bent, Kiowa, Prowers | 3 hr |
| Jul 31, 1:58 PM MDT | Flash Flood Warning | PUB | Chaffee | 78 min |
| Jul 31, 2:15 PM MDT | Flash Flood Warning | PUB | Costilla, Huerfano, Las Animas | 3 hr |
| Jul 31, 2:24 PM MDT | Flash Flood Warning | GLD | Cheyenne | 2 hr |
| Jul 31, 4:28 PM MDT | Flash Flood Warning | PUB | Kiowa, Prowers | 113 min |
| Jul 31, 5:03 PM MDT | Flash Flood Warning | PUB | Teller | 3 hr |
| Jul 31, 9:37 PM MDT | Flash Flood Warning | PUB | Kiowa, Prowers | 8 hr |
| Aug 1, 3:13 PM MDT | Flash Flood Warning | BOU | Jefferson | 2 hr |
| Aug 2, 6:33 PM MDT | Flash Flood Warning | PUB | Fremont, Teller | 4 hr |
| Aug 2, 7:01 PM MDT | Flash Flood Warning | PUB | Fremont | 3 hr |
| Aug 2, 7:12 PM MDT | Flash Flood Warning | PUB | Pueblo | 3 hr |
| Aug 2, 7:34 PM MDT | Flash Flood Warning | GLD | Kit Carson | 3 hr |
| Aug 2, 7:54 PM MDT | Flash Flood Warning | GLD | Yuma | 3 hr |
| Aug 2, 8:04 PM MDT | Flash Flood Warning | PUB | Costilla, Huerfano, Las Animas | 2 hr |
| Aug 2, 8:10 PM MDT | Flash Flood Warning | BOU | Elbert, Lincoln | 2 hr |
| Aug 2, 8:38 PM MDT | Flash Flood Warning | BOU | Lincoln | 112 min |
| Aug 4, 2:45 PM MDT | Flash Flood Warning | GJT | Dolores, Montezuma, San Miguel | 3 hr |
| Aug 4, 3:35 PM MDT | Flash Flood Warning | PUB | Fremont | 3 hr |
| Aug 4, 3:49 PM MDT | Flash Flood Warning | PUB | Teller | 3 hr |
| Aug 4, 3:55 PM MDT | Flash Flood Warning | BOU | Douglas | 3 hr |
| Aug 4, 4:01 PM MDT | Flash Flood Warning | PUB | Chaffee | 2 hr |
| Aug 4, 5:20 PM MDT | Flash Flood Warning | PUB | El Paso, Teller | 2 hr |
| Aug 5, 8:02 PM MDT | Flash Flood Warning | GLD | Yuma | 3 hr |
| Aug 6, 4:38 PM MDT | Flash Flood Warning | BOU | Lincoln | 76 min |
| Aug 7, 3:30 PM MDT | Flash Flood Warning | PUB | Huerfano, Las Animas | 61 min |
| Aug 7, 7:53 PM MDT | Flash Flood Warning | GLD | Kit Carson | 3 hr |
| Aug 7, 8:54 PM MDT | Flash Flood Warning | GLD | Kit Carson | 2 hr |
| Aug 9, 6:36 PM MDT | Flash Flood Warning | BOU | Morgan | 3 hr |
| Aug 16, 3:35 PM MDT | Flash Flood Warning | GJT | Gunnison, Montrose, Ouray, San Miguel | 3 hr |
| Aug 16, 3:35 PM MDT | Flash Flood Warning | GJT | Mesa | 4 hr |
| Aug 16, 6:27 PM MDT | Flash Flood Warning | GJT | Gunnison, Montrose, Ouray, San Miguel | 3 hr |
| Aug 19, 4:57 PM MDT | Flash Flood Warning | GJT | Ouray, San Miguel | 3 hr |
By county
Every county with at least one alert. A county page lists each alert that covered it.
- Las Animas County10
- Kit Carson County9
- Huerfano County7
- El Paso County7
- San Miguel County7
- Pueblo County6
- Morgan County6
- Teller County6
- Elbert County5
- Lincoln County5
- Fremont County5
- Yuma County4
- Montrose County4
- Cheyenne County3
- Weld County3
- Dolores County3
- Chaffee County3
- Kiowa County3
- Prowers County3
- Ouray County3
- Montezuma County2
- Crowley County2
- Phillips County2
- Larimer County2
- Douglas County2
- Mesa County2
- Costilla County2
- Gunnison County2
- Otero County1
- Logan County1
- Washington County1
- Sedgwick County1
- Baca County1
- Adams County1
- Arapahoe County1
- San Juan County1
- Boulder County1
- Bent County1
- Jefferson County1
The busiest days
Days with the most alerts issued, by UTC date.
Nearby
Alerts in force nowTornadoes on recordThe radar archive20092011
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.