Alert archive / Colorado / San Miguel County

Weather alerts in San Miguel County, Colorado, 2021

165 weather alerts in 2021, from the National Weather Service and the Storm Prediction Center. An alert counts here when it covered this county.

San Miguel County and its neighbors

Each county as a circle sized by its count in 2021. Tap one for its archive.

Alerts: 165
Warnings: 63
Watches: 52
Advisories: 42
Busiest month: July34 alerts
Busiest day: August 19, 20217 alerts

Over time

By month

Warning verification

How often warnings here had a storm report inside them, and how much warning the reports had.

San Miguel County, 2021

	Warnings	With a report	False alarm ratio	Reports	Inside a warning	Mean lead time
Tornado warnings	0			0
Severe thunderstorm warnings	4	0	100%	1	0%
Flash flood warnings	10	2	80%	9	33%	47 min

Each office's whole area, 2021

	Warnings	With a report	False alarm ratio	Reports	Inside a warning	Mean lead time
NWS Grand Junction, CO: severe thunderstorm warnings	28	3	89%	29	10%	27 min
NWS Grand Junction, CO: flash flood warnings	85	20	76%	51	49%	51 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 17, 1:57 PM MST	Winter Weather Advisory	GJT	24 hr
Jan 18, 1:40 PM MST	Winter Storm Warning	GJT	27 hr
Jan 18, 1:40 PM MST	Winter Weather Advisory	GJT	27 hr
Jan 21, 2:00 PM MST	Winter Weather Advisory	GJT	4 days
Jan 25, 3:35 AM MST	Winter Weather Advisory	GJT	37 hr
Jan 29, 3:33 AM MST	Winter Weather Advisory	GJT	28 hr
Feb 2, 3:33 AM MST	Winter Weather Advisory	GJT	52 hr
Feb 12, 3:10 AM MST	Winter Storm Watch	GJT	11 hr
Feb 12, 2:14 PM MST	Winter Storm Warning	GJT	51 hr
Feb 12, 2:14 PM MST	Winter Weather Advisory	GJT	51 hr
Feb 14, 2:13 PM MST	Winter Weather Advisory	GJT	51 hr
Feb 16, 2:50 PM MST	Special Weather Statement	GJT	40 min
Feb 19, 2:49 PM MST	Winter Weather Advisory	GJT	38 hr
Mar 3, 3:10 AM MST	Winter Weather Advisory	GJT	34 hr
Mar 11, 3:22 AM MST	Winter Storm Watch	GJT	24 hr
Mar 12, 3:47 AM MST	Winter Storm Warning	GJT	3 days
Mar 12, 3:47 AM MST	Winter Weather Advisory	GJT	3 days
Mar 22, 2:43 PM MDT	Winter Weather Advisory	GJT	51 hr
Mar 24, 9:35 PM MDT	Winter Weather Advisory	GJT	40 hr
Apr 2, 2:50 PM MDT	Fire Weather Watch	GJT	46 hr
Apr 4, 1:07 PM MDT	Red Flag Warning	GJT	32 hr
Apr 5, 4:01 AM MDT	Fire Weather Watch	GJT	10 hr
Apr 5, 2:20 PM MDT	Fire Weather Watch	GJT	24 hr
Apr 5, 2:20 PM MDT	Red Flag Warning	GJT	28 hr
Apr 6, 3:07 AM MDT	Freeze Warning	GJT	30 hr
Apr 6, 2:09 PM MDT	Red Flag Warning	GJT	30 hr
Apr 6, 6:29 PM MDT	Fire Weather Watch	GJT	20 hr
Apr 7, 2:20 PM MDT	Red Flag Warning	GJT	31 hr
Apr 8, 2:28 AM MDT	Red Flag Warning	GJT	43 hr
Apr 9, 9:01 PM MDT	Fire Weather Watch	GJT	5 hr
Apr 10, 1:57 AM MDT	Red Flag Warning	GJT	42 hr
Apr 12, 2:42 PM MDT	Fire Weather Watch	GJT	24 hr
Apr 13, 2:27 PM MDT	Red Flag Warning	GJT	31 hr
Apr 14, 2:33 AM MDT	Fire Weather Watch	GJT	12 hr
Apr 14, 2:33 AM MDT	Wind Advisory	GJT	18 hr
Apr 14, 2:12 PM MDT	Red Flag Warning	GJT	29 hr
Apr 16, 2:16 PM MDT	Winter Weather Advisory	GJT	31 hr
Apr 17, 3:41 AM MDT	Fire Weather Watch	GJT	24 hr
Apr 18, 3:44 AM MDT	Red Flag Warning	GJT	41 hr
Apr 19, 3:06 AM MDT	Freeze Watch	GJT	11 hr
Apr 19, 2:21 PM MDT	Fire Weather Watch	GJT	13 hr
Apr 19, 2:24 PM MDT	Freeze Warning	GJT	19 hr
Apr 20, 3:12 AM MDT	Red Flag Warning	GJT	18 hr
Apr 20, 3:12 AM MDT	Red Flag Warning	GJT	43 hr
Apr 22, 2:24 PM MDT	Fire Weather Watch	GJT	12 hr
Apr 22, 2:24 PM MDT	Fire Weather Watch	GJT	39 hr
Apr 23, 2:44 AM MDT	Red Flag Warning	GJT	41 hr
Apr 23, 2:35 PM MDT	Red Flag Warning	GJT	57 hr
Apr 25, 4:38 AM MDT	Fire Weather Watch	GJT	4 hr
Apr 25, 9:06 AM MDT	Red Flag Warning	GJT	35 hr
Apr 25, 9:52 AM MDT	Wind Advisory	GJT	32 hr
Apr 30, 1:39 PM MDT	Fire Weather Watch	GJT	13 hr
May 1, 2:16 AM MDT	Red Flag Warning	GJT	42 hr
May 2, 1:29 PM MDT	Winter Weather Advisory	GJT	25 hr
May 5, 2:16 PM MDT	Fire Weather Watch	GJT	24 hr
May 6, 2:08 PM MDT	Red Flag Warning	GJT	31 hr
May 13, 2:20 PM MDT	Fire Weather Watch	GJT	11 hr
May 14, 1:49 AM MDT	Red Flag Warning	GJT	18 hr
May 19, 3:21 AM MDT	Fire Weather Watch	GJT	11 hr
May 19, 2:34 PM MDT	Wind Advisory	GJT	30 hr
May 19, 2:39 PM MDT	Red Flag Warning	GJT	32 hr
May 21, 10:21 AM MDT	Winter Weather Advisory	GJT	14 hr
May 21, 9:03 PM MDT	Wind Advisory	GJT	26 hr
May 23, 3:01 PM MDT	Freeze Warning	GJT	18 hr
May 25, 2:52 AM MDT	Red Flag Warning	GJT	41 hr
Jun 6, 2:45 AM MDT	Fire Weather Watch	GJT	25 hr
Jun 6, 2:45 AM MDT	Red Flag Warning	GJT	17 hr
Jun 6, 2:33 PM MDT	Red Flag Warning	GJT	29 hr
Jun 7, 3:17 AM MDT	Red Flag Warning	GJT	42 hr
Jun 7, 2:35 PM MDT	Fire Weather Watch	GJT	20 hr
Jun 7, 2:35 PM MDT	Fire Weather Watch	GJT	20 hr
Jun 8, 10:22 AM MDT	Red Flag Warning	GJT	34 hr
Jun 8, 10:22 AM MDT	Red Flag Warning	GJT	62 hr
Jun 9, 2:46 PM MDT	Wind Advisory	GJT	30 hr
Jun 11, 2:14 PM MDT	Excessive Heat Watch	GJT	24 hr
Jun 12, 2:34 PM MDT	Excessive Heat Warning	GJT	6 days
Jun 17, 3:42 AM MDT	Fire Weather Watch	GJT	11 hr
Jun 17, 2:41 PM MDT	Fire Weather Watch	GJT	24 hr
Jun 17, 2:41 PM MDT	Red Flag Warning	GJT	30 hr
Jun 18, 2:34 PM MDT	Red Flag Warning	GJT	30 hr
Jun 18, 2:34 PM MDT	Red Flag Warning	GJT	57 hr
Jun 20, 3:43 AM MDT	Fire Weather Watch	GJT	11 hr
Jun 20, 2:17 PM MDT	Red Flag Warning	GJT	31 hr
Jun 20, 2:17 PM MDT	Red Flag Warning	GJT	55 hr
Jun 21, 3:18 AM MDT	Fire Weather Watch	GJT	11 hr
Jun 22, 2:41 PM MDT	Red Flag Warning	GJT	30 hr
Jul 6, 2:20 PM MDT	Heat Advisory	GJT	3 days
Jul 8, 1:32 PM MDT	Fire Weather Watch	GJT	24 hr
Jul 9, 1:44 PM MDT	Red Flag Warning	GJT	30 hr
Jul 10, 3:19 AM MDT	Heat Advisory	GJT	17 hr
Jul 13, 3:27 PM MDT	Areal Flood Advisory	GJT	3 hr
Jul 14, 2:19 AM MDT	Flash Flood Watch	GJT	18 hr
Jul 14, 8:51 PM MDT	Special Weather Statement	GJT	24 min
Jul 20, 2:50 PM MDT	Flash Flood Warning	GJT	5 hr
Jul 20, 3:19 PM MDT	Areal Flood Warning	GJT	2 min
Jul 20, 3:21 PM MDT	Flash Flood Warning	GJT	3 hr
Jul 20, 3:53 PM MDT	Flash Flood Warning	GJT	76 min
Jul 21, 2:42 AM MDT	Flash Flood Watch	GJT	21 hr
Jul 21, 1:44 PM MDT	Flash Flood Watch	GJT	34 hr
Jul 22, 1:50 PM MDT	Flash Flood Watch	GJT	36 hr
Jul 23, 2:17 PM MDT	Areal Flood Advisory	GJT	3 hr
Jul 23, 8:44 PM MDT	Areal Flood Advisory	GJT	2 hr
Jul 24, 3:51 AM MDT	Flash Flood Watch	GJT	17 hr
Jul 24, 1:46 PM MDT	Areal Flood Advisory	GJT	3 hr
Jul 24, 2:09 PM MDT	Areal Flood Advisory	GJT	55 min
Jul 24, 2:34 PM MDT	Areal Flood Advisory	GJT	30 min
Jul 24, 3:03 PM MDT	Flash Flood Warning	GJT	3 hr
Jul 25, 1:38 PM MDT	Areal Flood Advisory	GJT	112 min
Jul 26, 12:03 PM MDT	Flash Flood Watch	GJT	10 hr
Jul 28, 2:14 PM MDT	Flash Flood Warning	GJT	3 hr
Jul 28, 2:28 PM MDT	Flash Flood Watch	GJT	34 hr
Jul 28, 2:28 PM MDT	Flash Flood Watch	GJT	58 hr
Jul 28, 3:19 PM MDT	Flash Flood Warning	GJT	3 hr
Jul 29, 2:02 PM MDT	Special Weather Statement	GJT	43 min
Jul 29, 2:36 PM MDT	Areal Flood Advisory	GJT	3 hr
Jul 29, 3:18 PM MDT	Severe Thunderstorm Warning	GJT	27 min
Jul 29, 3:47 PM MDT	Flash Flood Warning	GJT	3 hr
Jul 30, 3:44 AM MDT	Flash Flood Watch	GJT	43 hr
Jul 31, 2:45 PM MDT	Flash Flood Warning	GJT	2 hr
Jul 31, 3:00 PM MDT	Special Weather Statement	GJT	30 min
Aug 1, 3:05 AM MDT	Flash Flood Watch	GJT	18 hr
Aug 1, 1:25 PM MDT	Flash Flood Watch	GJT	35 hr
Aug 2, 2:30 PM MDT	Flash Flood Watch	GJT	29 hr
Aug 3, 12:16 PM MDT	Flash Flood Warning Considerable damage threat	GJT	88 min
Aug 3, 3:21 PM MDT	Flash Flood Warning	GJT	104 min
Aug 3, 4:04 PM MDT	Special Weather Statement	GJT	41 min
Aug 17, 1:10 PM MDT	Flash Flood Watch	GJT	59 hr
Aug 19, 11:31 AM MDT	Special Weather Statement	GJT	29 min
Aug 19, 12:06 PM MDT	Severe Thunderstorm Warning	GJT	24 min
Aug 19, 1:32 PM MDT	Severe Thunderstorm Warning	GJT	28 min
Aug 19, 2:06 PM MDT	Special Weather Statement	GJT	24 min
Aug 19, 3:48 PM MDT	Severe Thunderstorm Warning	GJT	27 min
Aug 19, 4:09 PM MDT	Areal Flood Advisory	GJT	3 hr
Aug 19, 4:15 PM MDT	Special Weather Statement	GJT	30 min
Aug 30, 2:17 PM MDT	Flash Flood Watch	GJT	58 hr
Oct 10, 9:25 AM MDT	Freeze Watch	GJT	4 hr
Oct 10, 1:54 PM MDT	Freeze Warning	GJT	20 hr
Oct 10, 2:15 PM MDT	Winter Storm Watch	GJT	14 hr
Oct 11, 3:46 AM MDT	Winter Weather Advisory	GJT	50 hr
Oct 11, 2:34 PM MDT	Winter Storm Warning	GJT	33 hr
Oct 11, 2:35 PM MDT	Freeze Watch	GJT	24 hr
Oct 12, 2:07 PM MDT	Freeze Warning	GJT	20 hr
Oct 13, 3:28 PM MDT	Freeze Watch	GJT	13 hr
Oct 13, 3:28 PM MDT	Freeze Warning	GJT	19 hr
Oct 14, 4:37 AM MDT	Freeze Warning	GJT	29 hr
Oct 25, 3:02 AM MDT	Winter Weather Advisory	GJT	45 hr
Dec 5, 3:08 PM MST	Winter Weather Advisory	GJT	45 hr
Dec 7, 2:56 PM MST	Winter Storm Watch	GJT	21 hr
Dec 8, 12:16 PM MST	Winter Storm Watch	GJT	24 hr
Dec 8, 12:16 PM MST	Winter Storm Warning	GJT	54 hr
Dec 13, 4:20 AM MST	Winter Storm Watch	GJT	10 hr
Dec 13, 2:31 PM MST	Winter Storm Warning	GJT	47 hr
Dec 13, 2:31 PM MST	Winter Weather Advisory	GJT	53 hr
Dec 13, 2:38 PM MST	High Wind Watch	GJT	13 hr
Dec 14, 3:41 AM MST	Wind Advisory	GJT	28 hr
Dec 22, 3:34 AM MST	Winter Storm Warning	GJT	3 days
Dec 22, 3:34 AM MST	Winter Weather Advisory	GJT	3 days
Dec 25, 2:59 AM MST	Winter Storm Watch	GJT	12 hr
Dec 25, 2:59 PM MST	Winter Storm Warning	GJT	4 days
Dec 25, 2:59 PM MST	Winter Weather Advisory	GJT	4 days
Dec 25, 3:02 PM MST	Wind Advisory	GJT	25 hr
Dec 27, 4:02 AM MST	Winter Weather Advisory	GJT	52 hr
Dec 28, 1:48 PM MST	Winter Storm Watch	GJT	25 hr
Dec 29, 2:53 PM MST	Winter Storm Warning	GJT	72 hr
Dec 29, 2:53 PM MST	Winter Weather Advisory	GJT	62 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	4
Special Weather Statement	8
Flooding
Areal Flood Warning	1
Flash Flood Warning	10
Flash Flood Watch	14
Areal Flood Advisory	9
Winter
Winter Storm Warning	9
Winter Storm Watch	8
Winter Weather Advisory	24
Heat
Excessive Heat Warning	1
Excessive Heat Watch	1
Heat Advisory	2
Cold
Freeze Warning	7
Freeze Watch	4
Wind and dust
High Wind Watch	1
Wind Advisory	7
Fire
Red Flag Warning	31
Fire Weather Watch	24

The busiest days

Days with the most alerts issued, by UTC date.

Nearby

Alerts in force now Tornadoes on record Forecast The radar archive 2020 2022

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.