Alert archive / Colorado / Delta County
Weather alerts in Delta County, Colorado, 2019
112 weather alerts in 2019, 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 2019. Tap one for its archive.
- Alerts
- 112
- Warnings
- 35
- Watches
- 27
- Advisories
- 36
- Busiest month
- February15 alerts
- Busiest day
- July 27, 20195 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, 2019
| Warnings | With a report | False alarm ratio | Reports | Inside a warning | Mean lead time | |
|---|---|---|---|---|---|---|
| Tornado warnings | 0 | 0 | ||||
| Severe thunderstorm warnings | 1 | 0 | 100% | 0 | ||
| Flash flood warnings | 1 | 0 | 100% | 1 | 0% |
Each office's whole area, 2019
| Warnings | With a report | False alarm ratio | Reports | Inside a warning | Mean lead time | |
|---|---|---|---|---|---|---|
| NWS Grand Junction, CO: severe thunderstorm warnings | 15 | 2 | 87% | 42 | 7% | 12 min |
| NWS Grand Junction, CO: flash flood warnings | 7 | 2 | 71% | 7 | 29% | 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 | Lasted |
|---|---|---|---|
| Jan 5, 3:41 AM MST | Winter Weather Advisory | GJT | 68 hr |
| Jan 10, 3:29 PM MST | Winter Weather Advisory | GJT | 33 hr |
| Jan 14, 2:15 PM MST | Winter Weather Advisory | GJT | 55 hr |
| Jan 16, 2:38 PM MST | Winter Weather Advisory | GJT | 57 hr |
| Jan 16, 8:28 PM MST | Dense Fog Advisory | GJT | 14 hr |
| Jan 16, 8:59 PM MST | Winter Storm Warning | GJT | 51 hr |
| Jan 20, 3:08 AM MST | Winter Weather Advisory | GJT | 53 hr |
| Feb 2, 3:48 AM MST | Winter Weather Advisory | GJT | 38 hr |
| Feb 4, 3:35 PM MST | Winter Storm Watch | GJT | 12 hr |
| Feb 4, 3:35 PM MST | Winter Storm Warning | GJT | 61 hr |
| Feb 12, 3:34 PM MST | Winter Storm Watch | GJT | 12 hr |
| Feb 13, 3:14 AM MST | Winter Storm Warning | GJT | 54 hr |
| Feb 13, 3:14 AM MST | Winter Weather Advisory | GJT | 54 hr |
| Feb 14, 11:52 PM MST | Dense Fog Advisory | GJT | 11 hr |
| Feb 15, 1:53 PM MST | Winter Weather Advisory | GJT | 22 hr |
| Feb 17, 4:43 AM MST | Winter Weather Advisory | GJT | 61 hr |
| Feb 19, 6:19 PM MST | Winter Storm Warning | GJT | 3 days |
| Feb 20, 3:42 AM MST | Winter Storm Watch | GJT | 11 hr |
| Feb 20, 2:33 PM MST | Winter Weather Advisory | GJT | 60 hr |
| Feb 27, 2:06 PM MST | Winter Weather Advisory | GJT | 38 hr |
| Feb 28, 4:50 AM MST | Winter Storm Warning | GJT | 4 days |
| Feb 28, 3:21 PM MST | Winter Storm Watch | GJT | 13 hr |
| Mar 5, 4:30 AM MST | Winter Storm Watch | GJT | 11 hr |
| Mar 5, 3:38 PM MST | Winter Storm Warning | GJT | 50 hr |
| Mar 5, 3:38 PM MST | Winter Weather Advisory | GJT | 50 hr |
| Mar 7, 3:57 PM MST | Winter Storm Warning | GJT | 40 hr |
| Mar 7, 3:57 PM MST | Winter Weather Advisory | GJT | 39 hr |
| Mar 10, 3:15 PM MDT | Winter Storm Warning | GJT | 4 days |
| Mar 11, 3:12 PM MDT | Winter Weather Advisory | GJT | 63 hr |
| Apr 8, 2:10 PM MDT | Wind Advisory | GJT | 32 hr |
| Apr 8, 11:47 PM MDT | Winter Storm Watch | GJT | 4 hr |
| Apr 9, 3:52 AM MDT | Winter Storm Warning | GJT | 53 hr |
| Apr 9, 3:52 AM MDT | Winter Weather Advisory | GJT | 53 hr |
| Apr 10, 3:29 AM MDT | Freeze Warning | GJT | 31 hr |
| Apr 10, 3:01 PM MDT | Freeze Watch | GJT | 12 hr |
| Apr 11, 3:26 AM MDT | Freeze Warning | GJT | 31 hr |
| Apr 11, 3:30 PM MDT | Freeze Watch | GJT | 11 hr |
| Apr 12, 2:57 AM MDT | Freeze Warning | GJT | 30 hr |
| Apr 13, 3:00 PM MDT | Freeze Warning | GJT | 19 hr |
| Apr 26, 4:47 PM MDT | Severe Thunderstorm Warning | GJT | 28 min |
| Apr 27, 8:43 PM MDT | Special Weather Statement | GJT | 47 min |
| Apr 28, 2:04 PM MDT | Wind Advisory | GJT | 6 hr |
| Apr 28, 3:13 PM MDT | Winter Storm Watch | GJT | 7 hr |
| Apr 28, 9:58 PM MDT | Winter Storm Warning | GJT | 62 hr |
| May 7, 2:52 PM MDT | Winter Storm Watch | GJT | 13 hr |
| May 8, 3:49 AM MDT | Winter Weather Advisory | GJT | 35 hr |
| May 19, 4:06 AM MDT | Winter Storm Watch | GJT | 11 hr |
| May 19, 3:02 PM MDT | Winter Storm Warning | GJT | 47 hr |
| May 22, 2:55 PM MDT | Winter Weather Advisory | GJT | 32 hr |
| May 26, 3:03 PM MDT | Special Weather Statement | GJT | 42 min |
| May 27, 3:57 AM MDT | Winter Storm Watch | GJT | 11 hr |
| May 27, 2:43 PM MDT | Winter Weather Advisory | GJT | 33 hr |
| Jun 2, 1:21 PM MDT | Special Weather Statement | GJT | 24 min |
| Jun 2, 1:46 PM MDT | Special Weather Statement | GJT | 29 min |
| Jun 13, 7:17 PM MDT | Special Weather Statement | GJT | 43 min |
| Jun 14, 4:43 PM MDT | Areal Flood Advisory | GJT | 5 days |
| Jun 18, 2:37 PM MDT | Fire Weather Watch | GJT | 24 hr |
| Jun 19, 2:51 PM MDT | Red Flag Warning | GJT | 30 hr |
| Jun 21, 10:41 AM MDT | Winter Weather Advisory | GJT | 43 hr |
| Jun 24, 2:13 PM MDT | Fire Weather Watch | GJT | 49 hr |
| Jun 25, 3:14 PM MDT | Red Flag Warning | GJT | 30 hr |
| Jun 26, 3:10 PM MDT | Red Flag Warning | GJT | 29 hr |
| Jul 13, 2:45 PM MDT | Special Weather Statement | GJT | 30 min |
| Jul 13, 4:19 PM MDT | Special Weather Statement | GJT | 26 min |
| Jul 15, 2:24 PM MDT | Fire Weather Watch | GJT | 25 hr |
| Jul 15, 2:24 PM MDT | Red Flag Warning | GJT | 54 hr |
| Jul 22, 2:00 PM MDT | Special Weather Statement | GJT | 45 min |
| Jul 25, 5:46 PM MDT | Special Weather Statement | GJT | 14 min |
| Jul 26, 6:34 PM MDT | Special Weather Statement | GJT | 26 min |
| Jul 26, 7:00 PM MDT | Flash Flood Warning | GJT | 3 hr |
| Jul 26, 7:03 PM MDT | Special Weather Statement | GJT | 27 min |
| Jul 27, 3:57 AM MDT | Flash Flood Watch | GJT | 17 hr |
| Jul 27, 12:20 PM MDT | Areal Flood Advisory | GJT | 101 min |
| Aug 11, 3:33 PM MDT | Special Weather Statement | GJT | 42 min |
| Aug 14, 1:56 PM MDT | Fire Weather Watch | GJT | 21 hr |
| Aug 15, 11:15 AM MDT | Fire Weather Watch | GJT | 27 hr |
| Aug 15, 11:15 AM MDT | Red Flag Warning | GJT | 33 hr |
| Aug 16, 2:01 PM MDT | Red Flag Warning | GJT | 30 hr |
| Aug 27, 2:53 PM MDT | Fire Weather Watch | GJT | 31 hr |
| Sep 6, 1:14 PM MDT | Special Weather Statement | GJT | 31 min |
| Sep 16, 4:35 PM MDT | Special Weather Statement | GJT | 40 min |
| Sep 19, 2:58 PM MDT | Red Flag Warning | GJT | 29 hr |
| Sep 28, 4:22 AM MDT | Wind Advisory | GJT | 41 hr |
| Sep 29, 2:54 PM MDT | Red Flag Warning | GJT | 30 hr |
| Sep 30, 3:15 AM MDT | Fire Weather Watch | GJT | 11 hr |
| Sep 30, 2:24 PM MDT | Red Flag Warning | GJT | 29 hr |
| Oct 1, 2:02 PM MDT | Red Flag Warning | GJT | 29 hr |
| Oct 2, 1:55 AM MDT | Freeze Watch | GJT | 12 hr |
| Oct 2, 2:10 PM MDT | Freeze Warning | GJT | 19 hr |
| Oct 7, 12:11 PM MDT | Fire Weather Watch | GJT | 15 hr |
| Oct 8, 2:55 AM MDT | Red Flag Warning | GJT | 42 hr |
| Oct 9, 3:50 AM MDT | Freeze Watch | GJT | 24 hr |
| Oct 9, 4:13 AM MDT | Winter Weather Advisory | GJT | 32 hr |
| Oct 10, 3:37 AM MDT | Freeze Warning | GJT | 30 hr |
| Oct 15, 2:15 PM MDT | Fire Weather Watch | GJT | 25 hr |
| Oct 16, 2:57 PM MDT | Red Flag Warning | GJT | 28 hr |
| Oct 26, 3:28 PM MDT | Winter Weather Advisory | GJT | 44 hr |
| Oct 28, 1:50 PM MDT | Winter Storm Warning | GJT | 43 hr |
| Oct 28, 1:50 PM MDT | Winter Weather Advisory | GJT | 43 hr |
| Nov 18, 2:43 PM MST | Winter Storm Watch | GJT | 12 hr |
| Nov 18, 2:43 PM MST | Winter Storm Warning | GJT | 4 days |
| Nov 24, 2:28 PM MST | Winter Weather Advisory | GJT | 51 hr |
| Nov 26, 4:02 PM MST | Winter Storm Watch | GJT | 24 hr |
| Nov 26, 4:02 PM MST | Winter Storm Warning | GJT | 4 days |
| Nov 27, 4:00 PM MST | Winter Weather Advisory | GJT | 3 days |
| Dec 4, 3:29 AM MST | Winter Weather Advisory | GJT | 37 hr |
| Dec 7, 2:39 AM MST | Winter Weather Advisory | GJT | 56 hr |
| Dec 11, 3:02 PM MST | Winter Weather Advisory | GJT | 4 days |
| Dec 11, 9:28 PM MST | Winter Storm Watch | GJT | 41 hr |
| Dec 12, 4:09 AM MST | Winter Storm Warning | GJT | 4 days |
| Dec 23, 2:58 AM MST | Winter Weather Advisory | GJT | 68 hr |
| Dec 26, 2:40 AM MST | Winter Weather Advisory | GJT | 50 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 | 1 |
| Special Weather Statement | 14 |
| Flooding | |
| Flash Flood Warning | 1 |
| Flash Flood Watch | 1 |
| Areal Flood Advisory | 2 |
| Winter | |
| Winter Storm Warning | 15 |
| Winter Storm Watch | 13 |
| Winter Weather Advisory | 29 |
| Cold | |
| Freeze Warning | 6 |
| Freeze Watch | 4 |
| Wind and dust | |
| Wind Advisory | 3 |
| Fire | |
| Red Flag Warning | 12 |
| Fire Weather Watch | 9 |
| Fog and smoke | |
| Dense Fog Advisory | 2 |
The busiest days
Days with the most alerts issued, by UTC date.
Nearby
Alerts in force nowTornadoes on recordForecastThe radar archive20182020
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.