Alert archive / Colorado / Montrose County
Weather alerts in Montrose County, Colorado, 2011
140 weather alerts in 2011, from the National Weather Service and the Storm Prediction Center. An alert counts here when it covered this county.
Montrose County and its neighbors
Each county as a circle sized by its count in 2011. Tap one for its archive.
- Alerts
- 140
- Warnings
- 43
- Watches
- 30
- Advisories
- 63
- Busiest month
- April29 alerts
- Busiest day
- June 30, 20115 alerts
Over time
By month
Warning verification
How often warnings here had a storm report inside them, and how much warning the reports had.
Montrose County, 2011
| Warnings | With a report | False alarm ratio | Reports | Inside a warning | Mean lead time | |
|---|---|---|---|---|---|---|
| Tornado warnings | 0 | 0 | ||||
| Severe thunderstorm warnings | 0 | 0 | ||||
| Flash flood warnings | 4 | 0 | 100% | 0 |
Each office's whole area, 2011
| Warnings | With a report | False alarm ratio | Reports | Inside a warning | Mean lead time | |
|---|---|---|---|---|---|---|
| NWS Grand Junction, CO: tornado warnings | 2 | 1 | 50% | 1 | 100% | 6 min |
| NWS Grand Junction, CO: severe thunderstorm warnings | 30 | 6 | 80% | 26 | 42% | 18 min |
| NWS Grand Junction, CO: flash flood warnings | 37 | 3 | 92% | 24 | 13% | 28 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 8, 2:42 AM MST | Winter Weather Advisory | GJT | 49 hr |
| Jan 15, 4:56 AM MST | Winter Weather Advisory | GJT | 72 hr |
| Jan 17, 8:32 AM MST | Freezing Rain Advisory | GJT | 2 hr |
| Jan 18, 2:55 PM MST | Winter Weather Advisory | GJT | 30 hr |
| Jan 21, 4:06 AM MST | Winter Weather Advisory | GJT | 42 hr |
| Jan 30, 3:35 AM MST | Winter Weather Advisory | GJT | 3 days |
| Jan 31, 3:41 AM MST | Wind Chill Warning | GJT | 51 hr |
| Feb 1, 8:07 AM MST | Winter Storm Warning | GJT | 10 hr |
| Feb 4, 3:29 AM MST | Winter Storm Warning | GJT | 65 hr |
| Feb 4, 2:47 PM MST | Winter Weather Advisory | GJT | 53 hr |
| Feb 6, 4:26 AM MST | Winter Storm Watch | GJT | 10 hr |
| Feb 6, 2:28 PM MST | Winter Storm Warning | GJT | 52 hr |
| Feb 6, 2:28 PM MST | Winter Weather Advisory | GJT | 54 hr |
| Feb 6, 8:06 PM MST | Winter Storm Watch | GJT | 19 hr |
| Feb 15, 2:59 PM MST | Blizzard Watch | GJT | 14 hr |
| Feb 15, 3:00 PM MST | High Wind Warning | GJT | 33 hr |
| Feb 16, 5:12 AM MST | Blizzard Warning | GJT | 23 hr |
| Feb 16, 5:12 AM MST | Winter Storm Warning | GJT | 39 hr |
| Feb 16, 5:12 AM MST | Winter Weather Advisory | GJT | 39 hr |
| Feb 16, 5:29 AM MST | Wind Advisory | GJT | 19 hr |
| Feb 17, 3:04 PM MST | Winter Storm Watch | GJT | 37 hr |
| Feb 18, 1:04 PM MST | Winter Storm Warning | GJT | 59 hr |
| Feb 23, 2:34 PM MST | Winter Storm Watch | GJT | 13 hr |
| Feb 24, 3:56 AM MST | Winter Storm Warning | GJT | 3 days |
| Feb 24, 3:56 AM MST | Winter Weather Advisory | GJT | 3 days |
| Mar 2, 11:40 AM MST | Winter Weather Advisory | GJT | 51 hr |
| Mar 5, 4:12 AM MST | Winter Weather Advisory | GJT | 50 hr |
| Mar 5, 2:15 PM MST | Winter Storm Watch | GJT | 38 hr |
| Mar 6, 3:01 PM MST | Winter Storm Warning | GJT | 51 hr |
| Mar 15, 3:57 AM MDT | Winter Storm Watch | GJT | 19 hr |
| Mar 15, 3:11 PM MDT | Winter Storm Warning | GJT | 63 hr |
| Mar 16, 3:16 PM MDT | Winter Weather Advisory | GJT | 39 hr |
| Mar 20, 2:35 PM MDT | Wind Advisory | GJT | 30 hr |
| Mar 20, 3:02 PM MDT | Winter Weather Advisory | GJT | 57 hr |
| Mar 24, 3:16 PM MDT | Winter Weather Advisory | GJT | 36 hr |
| Mar 26, 4:22 AM MDT | Winter Weather Advisory | GJT | 34 hr |
| Mar 27, 3:36 PM MDT | Winter Weather Advisory | GJT | 37 hr |
| Mar 28, 9:46 AM MDT | Winter Storm Warning | GJT | 19 hr |
| Apr 1, 3:16 PM MDT | Winter Storm Watch | GJT | 13 hr |
| Apr 2, 4:25 AM MDT | Winter Storm Warning | GJT | 48 hr |
| Apr 2, 4:25 AM MDT | Winter Weather Advisory | GJT | 48 hr |
| Apr 6, 3:15 AM MDT | Winter Weather Advisory | GJT | 33 hr |
| Apr 8, 4:40 AM MDT | Winter Storm Watch | GJT | 22 hr |
| Apr 8, 10:01 AM MDT | Winter Storm Warning | GJT | 62 hr |
| Apr 8, 10:01 AM MDT | Winter Weather Advisory | GJT | 62 hr |
| Apr 13, 3:03 AM MDT | Winter Weather Advisory | GJT | 39 hr |
| Apr 14, 2:47 PM MDT | Freeze Warning | GJT | 18 hr |
| Apr 18, 3:31 AM MDT | Winter Weather Advisory | GJT | 38 hr |
| Apr 21, 10:09 AM MDT | Wind Advisory | GJT | 11 hr |
| Apr 21, 10:12 AM MDT | Winter Weather Advisory | GJT | 18 hr |
| Apr 22, 4:30 AM MDT | Winter Storm Watch | GJT | 11 hr |
| Apr 22, 3:00 PM MDT | Winter Storm Warning | GJT | 63 hr |
| Apr 23, 10:35 AM MDT | Winter Weather Advisory | GJT | 52 hr |
| Apr 25, 5:35 AM MDT | Freeze Watch | GJT | 4 hr |
| Apr 25, 9:55 AM MDT | Freeze Warning | GJT | 47 hr |
| Apr 25, 3:00 PM MDT | Winter Storm Warning | GJT | 33 hr |
| Apr 25, 3:00 PM MDT | Winter Weather Advisory | GJT | 33 hr |
| Apr 26, 2:05 PM MDT | Freeze Watch | GJT | 17 hr |
| Apr 27, 6:51 AM MDT | Freeze Warning | GJT | 26 hr |
| Apr 28, 2:37 PM MDT | Freeze Watch | GJT | 18 hr |
| Apr 28, 2:45 PM MDT | Winter Weather Advisory | GJT | 41 hr |
| Apr 29, 4:00 AM MDT | Wind Advisory | GJT | 17 hr |
| Apr 29, 8:55 AM MDT | Freeze Watch | GJT | 24 hr |
| Apr 29, 8:55 AM MDT | Freeze Warning | GJT | 24 hr |
| Apr 30, 9:00 AM MDT | Freeze Watch | GJT | 30 hr |
| Apr 30, 9:00 AM MDT | Freeze Warning | GJT | 24 hr |
| Apr 30, 2:13 PM MDT | Winter Weather Advisory | GJT | 34 hr |
| May 1, 2:56 PM MDT | Freeze Watch | GJT | 24 hr |
| May 1, 2:56 PM MDT | Freeze Warning | GJT | 18 hr |
| May 2, 2:37 PM MDT | Freeze Warning | GJT | 18 hr |
| May 4, 2:13 PM MDT | Freeze Warning | GJT | 16 hr |
| May 9, 3:13 PM MDT | Winter Storm Watch | GJT | 13 hr |
| May 10, 3:48 AM MDT | Winter Storm Warning | GJT | 44 hr |
| May 10, 3:48 AM MDT | Winter Weather Advisory | GJT | 44 hr |
| May 17, 3:00 PM MDT | Winter Weather Advisory | GJT | 17 hr |
| May 18, 6:17 AM MDT | Winter Weather Advisory | GJT | 8 hr |
| May 18, 2:01 PM MDT | Winter Storm Warning | GJT | 58 hr |
| May 26, 4:13 AM MDT | Wind Advisory | GJT | 15 hr |
| May 28, 4:33 AM MDT | Wind Advisory | GJT | 40 hr |
| May 31, 3:01 PM MDT | Wind Advisory | GJT | 52 hr |
| Jun 6, 4:39 AM MDT | Wind Advisory | GJT | 16 hr |
| Jun 7, 2:54 PM MDT | Red Flag Warning | GJT | 30 hr |
| Jun 14, 2:15 PM MDT | Fire Weather Watch | GJT | 24 hr |
| Jun 15, 2:02 PM MDT | Fire Weather Watch | GJT | 24 hr |
| Jun 15, 2:02 PM MDT | Fire Weather Watch | GJT | 48 hr |
| Jun 15, 2:02 PM MDT | Red Flag Warning | GJT | 32 hr |
| Jun 16, 2:27 PM MDT | Red Flag Warning | GJT | 29 hr |
| Jun 17, 1:46 PM MDT | Red Flag Warning | GJT | 31 hr |
| Jun 19, 2:03 PM MDT | Winter Weather Advisory | GJT | 25 hr |
| Jun 29, 11:01 AM MDT | Wind Advisory | GJT | 10 hr |
| Jun 30, 8:51 AM MDT | Mesoscale Discussion | SPC | 54 min |
| Jun 30, 9:06 AM MDT | Severe Thunderstorm Watch | SPC | 7 hr |
| Jun 30, 12:40 PM MDT | Special Weather Statement | GJT | 65 min |
| Jun 30, 1:35 PM MDT | Special Weather Statement | GJT | 55 min |
| Jun 30, 1:49 PM MDT | Mesoscale Discussion | SPC | 116 min |
| Jul 6, 7:57 PM MDT | Areal Flood Advisory | GJT | 2 hr |
| Jul 10, 12:06 AM MDT | Areal Flood Advisory | GJT | 3 hr |
| Jul 10, 4:06 PM MDT | Flash Flood Warning | GJT | 2 hr |
| Jul 11, 3:21 AM MDT | Flash Flood Watch | GJT | 45 hr |
| Jul 12, 2:20 PM MDT | Flash Flood Warning | GJT | 3 hr |
| Jul 12, 4:56 PM MDT | Flash Flood Warning | GJT | 3 hr |
| Jul 18, 2:36 PM MDT | Areal Flood Advisory | GJT | 3 hr |
| Jul 19, 3:02 PM MDT | Areal Flood Advisory | GJT | 3 hr |
| Jul 19, 3:20 PM MDT | Areal Flood Advisory | GJT | 3 hr |
| Jul 19, 3:38 PM MDT | Areal Flood Advisory | GJT | 3 hr |
| Jul 25, 9:03 PM MDT | Flash Flood Watch | GJT | 25 hr |
| Jul 26, 12:13 PM MDT | Areal Flood Advisory | GJT | 4 hr |
| Jul 26, 5:21 PM MDT | Areal Flood Advisory | GJT | 4 hr |
| Aug 2, 4:40 AM MDT | Flash Flood Watch | GJT | 16 hr |
| Aug 2, 4:25 PM MDT | Flash Flood Warning | GJT | 3 hr |
| Aug 4, 2:31 PM MDT | Areal Flood Advisory | GJT | 118 min |
| Aug 26, 3:25 PM MDT | Areal Flood Advisory | GJT | 76 min |
| Aug 27, 2:00 PM MDT | Areal Flood Advisory | GJT | 3 hr |
| Sep 14, 5:00 AM MDT | Winter Weather Advisory | GJT | 24 hr |
| Sep 21, 3:00 PM MDT | Freeze Warning | GJT | 17 hr |
| Sep 22, 1:45 PM MDT | Freeze Warning | GJT | 19 hr |
| Oct 4, 4:51 AM MDT | Winter Storm Watch | GJT | 33 hr |
| Oct 5, 5:34 AM MDT | Winter Storm Warning | GJT | 39 hr |
| Oct 5, 1:45 PM MDT | Winter Weather Advisory | GJT | 31 hr |
| Oct 5, 9:35 PM MDT | Freeze Watch | GJT | 42 hr |
| Oct 5, 9:35 PM MDT | Freeze Watch | GJT | 16 hr |
| Oct 6, 1:28 PM MDT | Freeze Warning | GJT | 20 hr |
| Oct 23, 10:55 PM MDT | Winter Storm Watch | GJT | 24 hr |
| Oct 24, 10:52 PM MDT | Winter Storm Warning | GJT | 46 hr |
| Oct 24, 10:52 PM MDT | Winter Weather Advisory | GJT | 37 hr |
| Oct 31, 12:34 PM MDT | Winter Weather Advisory | GJT | 47 hr |
| Nov 3, 4:37 AM MDT | Winter Storm Watch | GJT | 17 hr |
| Nov 3, 2:20 PM MDT | Winter Storm Warning | GJT | 58 hr |
| Nov 3, 9:55 PM MDT | Winter Weather Advisory | GJT | 50 hr |
| Nov 6, 2:55 PM MST | Winter Weather Advisory | GJT | 33 hr |
| Nov 10, 3:04 PM MST | Winter Storm Watch | GJT | 24 hr |
| Nov 11, 3:39 AM MST | Winter Storm Warning | GJT | 66 hr |
| Nov 11, 3:00 PM MST | Winter Weather Advisory | GJT | 51 hr |
| Nov 18, 4:31 AM MST | Winter Weather Advisory | GJT | 49 hr |
| Nov 21, 8:45 AM MST | Winter Weather Advisory | GJT | 9 hr |
| Dec 2, 4:24 AM MST | Winter Storm Warning | GJT | 43 hr |
| Dec 2, 4:24 AM MST | Winter Weather Advisory | GJT | 43 hr |
| Dec 12, 2:10 AM MST | Winter Weather Advisory | GJT | 60 hr |
| Dec 20, 3:37 PM MST | Winter Weather Advisory | GJT | 52 hr |
| Dec 31, 9:30 AM MST | High Wind Warning | GJT | 5 hr |
By product
Every kind of product issued here, grouped by hazard. Each opens the same place narrowed to that product.
The busiest days
Days with the most alerts issued, by UTC date.
Nearby
Alerts in force nowTornadoes on recordForecastThe radar archive20102012
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.