Alert archive / Colorado / Delta County
Weather alerts in Delta County, Colorado, 2025
105 weather alerts in 2025, from the National Weather Service and the Storm Prediction Center. An alert counts here when it covered this county.
Delta County and its neighbors
Each county as a circle sized by its count in 2025. Tap one for its archive.
- Alerts
- 105
- Warnings
- 37
- Watches
- 30
- Advisories
- 26
- Busiest month
- April19 alerts
- Busiest day
- March 5, 20254 alerts
Over time
By month
Warning verification
How often warnings here had a storm report inside them, and how much warning the reports had.
Delta County, 2025
| Warnings | With a report | False alarm ratio | Reports | Inside a warning | Mean lead time | |
|---|---|---|---|---|---|---|
| Tornado warnings | 0 | 0 | ||||
| Severe thunderstorm warnings | 2 | 0 | 100% | 0 | ||
| Flash flood warnings | 3 | 0 | 100% | 0 |
Each office's whole area, 2025
| Warnings | With a report | False alarm ratio | Reports | Inside a warning | Mean lead time | |
|---|---|---|---|---|---|---|
| NWS Grand Junction, CO: tornado warnings | 5 | 1 | 80% | 3 | 33% | 19 min |
| NWS Grand Junction, CO: severe thunderstorm warnings | 72 | 12 | 83% | 35 | 49% | 16 min |
| NWS Grand Junction, CO: flash flood warnings | 44 | 10 | 77% | 31 | 48% | 73 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 | Lasted |
|---|---|---|---|
| Jan 3, 12:21 PM MST | Winter Weather Advisory | GJT | 51 hr |
| Jan 18, 1:36 AM MST | Extreme Cold Watch | GJT | 49 hr |
| Jan 20, 2:06 AM MST | Cold Weather Advisory | GJT | 31 hr |
| Jan 20, 2:06 AM MST | Extreme Cold Warning | GJT | 33 hr |
| Feb 12, 2:48 AM MST | Winter Storm Watch | GJT | 24 hr |
| Feb 13, 2:52 AM MST | Winter Storm Warning | GJT | 63 hr |
| Feb 16, 2:11 AM MST | Winter Weather Advisory | GJT | 55 hr |
| Mar 2, 1:57 AM MST | Winter Weather Advisory | GJT | 63 hr |
| Mar 5, 1:48 AM MST | Winter Storm Watch | GJT | 12 hr |
| Mar 5, 1:50 PM MST | Wind Advisory | GJT | 30 hr |
| Mar 5, 1:54 PM MST | Winter Storm Warning | GJT | 49 hr |
| Mar 5, 1:54 PM MST | Winter Weather Advisory | GJT | 45 hr |
| Mar 12, 2:39 AM MDT | Winter Weather Advisory | GJT | 63 hr |
| Mar 17, 3:12 AM MDT | Winter Weather Advisory | GJT | 51 hr |
| Mar 30, 3:03 AM MDT | Wind Advisory | GJT | 50 hr |
| Mar 31, 3:37 AM MDT | Winter Weather Advisory | GJT | 49 hr |
| Apr 11, 2:18 PM MDT | Red Flag Warning | GJT | 30 hr |
| Apr 12, 1:57 AM MDT | Red Flag Warning | GJT | 42 hr |
| Apr 15, 3:05 PM MDT | Fire Weather Watch | GJT | 23 hr |
| Apr 16, 2:01 PM MDT | Wind Advisory | GJT | 30 hr |
| Apr 16, 2:07 PM MDT | Red Flag Warning | GJT | 30 hr |
| Apr 16, 2:44 PM MDT | Winter Weather Advisory | GJT | 3 days |
| Apr 17, 1:53 PM MDT | Freeze Watch | GJT | 25 hr |
| Apr 17, 1:53 PM MDT | Freeze Watch | GJT | 37 hr |
| Apr 18, 2:32 AM MDT | Freeze Warning | GJT | 30 hr |
| Apr 19, 3:21 AM MDT | Freeze Warning | GJT | 30 hr |
| Apr 20, 2:15 AM MDT | Fire Weather Watch | GJT | 12 hr |
| Apr 20, 2:03 PM MDT | Red Flag Warning | GJT | 30 hr |
| Apr 23, 1:47 PM MDT | Fire Weather Watch | GJT | 12 hr |
| Apr 24, 2:04 AM MDT | Fire Weather Watch | GJT | 25 hr |
| Apr 24, 2:04 AM MDT | Red Flag Warning | GJT | 42 hr |
| Apr 24, 2:44 PM MDT | Fire Weather Watch | GJT | 35 hr |
| Apr 25, 2:52 AM MDT | Red Flag Warning | GJT | 41 hr |
| Apr 26, 2:05 AM MDT | Red Flag Warning | GJT | 42 hr |
| Apr 26, 2:02 PM MDT | Wind Advisory | GJT | 30 hr |
| May 12, 7:32 AM MDT | Wind Advisory | GJT | 37 hr |
| May 17, 2:19 PM MDT | Winter Weather Advisory | GJT | 40 hr |
| May 22, 3:19 AM MDT | Red Flag Warning | GJT | 41 hr |
| May 23, 3:19 AM MDT | Fire Weather Watch | GJT | 10 hr |
| May 23, 1:29 PM MDT | Red Flag Warning | GJT | 31 hr |
| Jun 6, 5:59 PM MDT | Severe Thunderstorm Warning | GJT | 17 min |
| Jun 6, 6:16 PM MDT | Special Weather Statement | GJT | 29 min |
| Jun 15, 2:15 AM MDT | Fire Weather Watch | GJT | 11 hr |
| Jun 15, 1:44 PM MDT | Red Flag Warning | GJT | 30 hr |
| Jun 16, 2:30 AM MDT | Fire Weather Watch | GJT | 7 hr |
| Jun 16, 9:15 AM MDT | Red Flag Warning | GJT | 35 hr |
| Jun 18, 1:48 AM MDT | Fire Weather Watch | GJT | 13 hr |
| Jun 18, 2:26 PM MDT | Fire Weather Watch | GJT | 11 hr |
| Jun 18, 2:26 PM MDT | Fire Weather Watch | GJT | 23 hr |
| Jun 18, 2:26 PM MDT | Red Flag Warning | GJT | 30 hr |
| Jun 19, 1:36 AM MDT | Red Flag Warning | GJT | 45 hr |
| Jun 19, 1:34 PM MDT | Wind Advisory | GJT | 32 hr |
| Jun 19, 1:40 PM MDT | Red Flag Warning | GJT | 56 hr |
| Jun 20, 1:41 AM MDT | Fire Weather Watch | GJT | 24 hr |
| Jun 20, 1:29 PM MDT | Wind Advisory | GJT | 33 hr |
| Jun 21, 1:24 AM MDT | Red Flag Warning | GJT | 44 hr |
| Jun 21, 2:51 PM MDT | Fire Weather Watch | GJT | 23 hr |
| Jun 22, 2:03 PM MDT | Red Flag Warning | GJT | 30 hr |
| Jul 3, 2:49 PM MDT | Areal Flood Advisory | GJT | 3 hr |
| Jul 3, 3:30 PM MDT | Areal Flood Advisory | GJT | 3 hr |
| Jul 8, 1:37 PM MDT | Fire Weather Watch | GJT | 13 hr |
| Jul 9, 2:11 AM MDT | Red Flag Warning | GJT | 42 hr |
| Jul 25, 2:05 AM MDT | Fire Weather Watch | GJT | 11 hr |
| Jul 25, 1:04 PM MDT | Red Flag Warning | GJT | 31 hr |
| Jul 26, 2:27 AM MDT | Red Flag Warning | GJT | 42 hr |
| Jul 30, 3:51 PM MDT | Flash Flood Warning | GJT | 39 min |
| Jul 31, 3:06 PM MDT | Special Weather Statement | GJT | 24 min |
| Aug 2, 1:26 PM MDT | Fire Weather Watch | GJT | 24 hr |
| Aug 3, 1:18 PM MDT | Fire Weather Watch | GJT | 13 hr |
| Aug 3, 1:18 PM MDT | Red Flag Warning | GJT | 32 hr |
| Aug 4, 1:48 AM MDT | Red Flag Warning | GJT | 42 hr |
| Aug 5, 2:15 AM MDT | Fire Weather Watch | GJT | 12 hr |
| Aug 5, 2:25 PM MDT | Red Flag Warning | GJT | 54 hr |
| Aug 5, 2:25 PM MDT | Red Flag Warning | GJT | 3 days |
| Aug 7, 1:21 PM MDT | Red Flag Warning | GJT | 55 hr |
| Aug 12, 2:12 PM MDT | Fire Weather Watch | GJT | 23 hr |
| Aug 12, 2:12 PM MDT | Fire Weather Watch | GJT | 48 hr |
| Aug 13, 1:05 PM MDT | Red Flag Warning | GJT | 31 hr |
| Aug 24, 2:36 PM MDT | Areal Flood Advisory | GJT | 2 hr |
| Aug 25, 2:42 PM MDT | Flood Watch | GJT | 35 hr |
| Aug 26, 7:14 PM MDT | Flash Flood Warning | GJT | 2 hr |
| Aug 26, 9:40 PM MDT | Flash Flood Warning | GJT | 3 hr |
| Sep 10, 12:50 PM MDT | Flood Watch | GJT | 59 hr |
| Sep 11, 12:05 PM MDT | Special Weather Statement | GJT | 25 min |
| Sep 11, 12:45 PM MDT | Severe Thunderstorm Warning | GJT | 30 min |
| Sep 11, 8:13 PM MDT | Special Weather Statement | GJT | 17 min |
| Sep 11, 8:21 PM MDT | Special Weather Statement | GJT | 24 min |
| Sep 11, 8:26 PM MDT | Special Weather Statement | GJT | 19 min |
| Sep 12, 9:16 AM MDT | Mesoscale Discussion | SPC | 2 hr |
| Sep 13, 3:25 AM MDT | Flood Watch | GJT | 21 hr |
| Sep 13, 12:04 PM MDT | Mesoscale Discussion | SPC | 116 min |
| Sep 13, 3:07 PM MDT | Special Weather Statement | GJT | 23 min |
| Sep 16, 6:47 PM MDT | Special Weather Statement | GJT | 28 min |
| Oct 3, 6:37 PM MDT | Special Weather Statement | GJT | 23 min |
| Oct 8, 1:27 PM MDT | Flood Watch | GJT | 4 days |
| Oct 26, 2:32 PM MDT | Freeze Watch | GJT | 22 hr |
| Oct 27, 12:38 PM MDT | Freeze Warning | GJT | 20 hr |
| Nov 16, 1:51 AM MST | Winter Weather Advisory | GJT | 39 hr |
| Nov 20, 3:37 AM MST | Dense Fog Advisory | GJT | 4 min |
| Nov 20, 4:21 AM MST | Special Weather Statement | GJT | 4 hr |
| Nov 29, 12:23 PM MST | Winter Weather Advisory | GJT | 42 hr |
| Dec 2, 2:26 AM MST | Winter Weather Advisory | GJT | 51 hr |
| Dec 4, 2:39 PM MST | Winter Storm Warning | GJT | 62 hr |
| Dec 4, 2:39 PM MST | Winter Weather Advisory | GJT | 56 hr |
| Dec 26, 2:04 AM MST | Winter Weather Advisory | GJT | 56 hr |
By product
Every kind of product issued here, grouped by hazard. Each opens the same place narrowed to that product.
| Product | Alerts |
|---|---|
| Severe storms | |
| Severe Thunderstorm Warning | 2 |
| Mesoscale Discussion | 2 |
| Special Weather Statement | 10 |
| Flooding | |
| Flash Flood Warning | 3 |
| Flood Watch | 4 |
| Areal Flood Advisory | 3 |
| Winter | |
| Winter Storm Warning | 3 |
| Winter Storm Watch | 2 |
| Winter Weather Advisory | 14 |
| Cold | |
| Extreme Cold Warning | 1 |
| Freeze Warning | 3 |
| Extreme Cold Watch | 1 |
| Freeze Watch | 3 |
| Cold Weather Advisory | 1 |
| Wind and dust | |
| Wind Advisory | 7 |
| Fire | |
| Red Flag Warning | 25 |
| Fire Weather Watch | 20 |
| Fog and smoke | |
| Dense Fog Advisory | 1 |
The busiest days
Days with the most alerts issued, by UTC date.
Nearby
Alerts in force nowTornadoes on recordForecastThe 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.