Weather alerts in San Juan County, Utah, 2022

187 weather alerts in 2022, from the National Weather Service and the Storm Prediction Center. An alert counts here when it covered this county.

San Juan County and its neighbors

Each county as a circle sized by its count in 2022. Tap one for its archive.

Alerts: 187
Warnings: 58
Watches: 39
Advisories: 67
Busiest month: May31 alerts
Busiest day: October 2, 202216 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 Juan County, 2022

	Warnings	With a report	False alarm ratio	Reports	Inside a warning	Mean lead time
Tornado warnings	0			0
Severe thunderstorm warnings	11	0	100%	0
Flash flood warnings	15	5	67%	10	80%	56 min

Each office's whole area, 2022

	Warnings	With a report	False alarm ratio	Reports	Inside a warning	Mean lead time
NWS Grand Junction, CO: severe thunderstorm warnings	29	5	83%	13	38%	17 min
NWS Grand Junction, CO: flash flood warnings	61	12	80%	38	63%	45 min
NWS Salt Lake City, UT: tornado warnings	0			4	0%
NWS Salt Lake City, UT: severe thunderstorm warnings	108	28	74%	176	27%	22 min
NWS Salt Lake City, UT: flash flood warnings	126	44	65%	79	68%	71 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
Feb 20, 2:47 PM MST	Wind Advisory	SLC	25 hr
Feb 20, 3:12 PM MST	Winter Storm Watch	SLC	25 hr
Feb 20, 3:31 PM MST	Winter Storm Warning	GJT	4 days
Feb 20, 3:31 PM MST	Winter Weather Advisory	GJT	4 days
Feb 21, 9:53 AM MST	Winter Storm Watch	GJT	17 hr
Feb 21, 3:55 PM MST	Winter Weather Advisory	SLC	52 hr
Mar 3, 2:13 PM MST	Winter Weather Advisory	GJT	4 days
Mar 5, 3:02 PM MST	Special Weather Statement	GJT	43 min
Mar 5, 3:11 PM MST	Special Weather Statement	GJT	34 min
Mar 5, 5:08 PM MST	Special Weather Statement	GJT	37 min
Mar 20, 1:42 PM MDT	Wind Advisory	GJT	31 hr
Mar 27, 2:43 PM MDT	Winter Weather Advisory	GJT	69 hr
Apr 6, 2:32 AM MDT	Freeze Warning	GJT	30 hr
Apr 8, 2:49 PM MDT	Wind Advisory	SLC	42 hr
Apr 10, 2:31 PM MDT	Wind Advisory	GJT	39 hr
Apr 10, 3:09 PM MDT	High Wind Warning	SLC	37 hr
Apr 10, 3:09 PM MDT	Wind Advisory	SLC	39 hr
Apr 11, 2:02 PM MDT	Freeze Watch	GJT	5 hr
Apr 11, 6:46 PM MDT	Freeze Warning	GJT	40 hr
Apr 11, 6:46 PM MDT	High Wind Warning	GJT	11 hr
Apr 12, 1:49 PM MDT	Freeze Warning	GJT	43 hr
Apr 15, 4:09 AM MDT	Wind Advisory	SLC	41 hr
Apr 15, 2:47 PM MDT	Wind Advisory	GJT	30 hr
Apr 18, 2:25 AM MDT	Wind Advisory	SLC	43 hr
Apr 18, 3:30 AM MDT	Wind Advisory	GJT	42 hr
Apr 21, 1:44 AM MDT	Wind Advisory	GJT	40 hr
Apr 21, 3:24 PM MDT	Wind Advisory	SLC	27 hr
May 1, 2:44 AM MDT	Wind Advisory	GJT	17 hr
May 1, 3:05 AM MDT	Wind Advisory	SLC	27 hr
May 2, 2:40 PM MDT	Wind Advisory	GJT	30 hr
May 6, 2:03 PM MDT	Wind Advisory	SLC	31 hr
May 6, 2:21 PM MDT	Wind Advisory	GJT	31 hr
May 7, 3:10 AM MDT	Wind Advisory	GJT	54 hr
May 7, 3:22 AM MDT	Wind Advisory	SLC	42 hr
May 8, 8:57 PM MDT	Wind Advisory	SLC	3 hr
May 9, 2:04 PM MDT	Wind Advisory	GJT	30 hr
May 10, 2:50 AM MDT	Wind Advisory	GJT	42 hr
May 10, 3:45 AM MDT	Wind Advisory	SLC	41 hr
May 11, 3:03 AM MDT	High Wind Warning	GJT	18 hr
May 11, 9:41 AM MDT	High Wind Warning	SLC	11 hr
May 16, 2:39 PM MDT	Fire Weather Watch	SLC	12 hr
May 17, 2:29 AM MDT	Red Flag Warning	SLC	3 days
May 18, 2:04 AM MDT	Red Flag Warning	GJT	46 hr
May 20, 2:36 AM MDT	Red Flag Warning	SLC	18 hr
May 20, 3:16 AM MDT	Red Flag Warning	GJT	18 hr
May 21, 3:12 AM MDT	Fire Weather Watch	GJT	11 hr
May 21, 10:27 AM MDT	Red Flag Warning	SLC	35 hr
May 21, 2:07 PM MDT	Red Flag Warning	GJT	29 hr
May 22, 2:37 PM MDT	Fire Weather Watch	GJT	20 hr
May 23, 3:00 AM MDT	Fire Weather Watch	SLC	7 hr
May 23, 9:41 AM MDT	Red Flag Warning	SLC	36 hr
May 23, 10:45 AM MDT	Red Flag Warning	GJT	34 hr
May 24, 2:29 PM MDT	Fire Weather Watch	SLC	24 hr
May 25, 2:34 PM MDT	Fire Weather Watch	SLC	23 hr
May 26, 1:41 PM MDT	Red Flag Warning	SLC	56 hr
May 26, 1:41 PM MDT	Red Flag Warning	SLC	3 days
May 27, 1:45 PM MDT	Wind Advisory	GJT	30 hr
May 28, 8:25 PM MDT	Wind Advisory	GJT	25 hr
Jun 9, 2:52 PM MDT	Fire Weather Watch	GJT	23 hr
Jun 9, 3:09 PM MDT	Heat Advisory	GJT	3 days
Jun 9, 3:22 PM MDT	Fire Weather Watch	SLC	24 hr
Jun 9, 3:41 PM MDT	Heat Advisory	SLC	3 days
Jun 10, 1:54 PM MDT	Fire Weather Watch	GJT	23 hr
Jun 10, 1:54 PM MDT	Red Flag Warning	GJT	58 hr
Jun 10, 3:01 PM MDT	Red Flag Warning	SLC	3 days
Jun 11, 1:22 PM MDT	Red Flag Warning	GJT	58 hr
Jun 12, 3:40 AM MDT	High Wind Watch	GJT	11 hr
Jun 12, 2:45 PM MDT	High Wind Warning	GJT	32 hr
Jun 12, 2:45 PM MDT	Wind Advisory	GJT	32 hr
Jun 12, 2:56 PM MDT	Wind Advisory	SLC	30 hr
Jun 13, 1:25 PM MDT	Blowing Dust Advisory	GJT	7 hr
Jun 15, 2:06 PM MDT	Fire Weather Watch	GJT	25 hr
Jun 15, 2:38 PM MDT	Fire Weather Watch	SLC	13 hr
Jun 16, 3:48 AM MDT	Red Flag Warning	SLC	4 days
Jun 16, 12:41 PM MDT	Wind Advisory	SLC	57 hr
Jun 16, 3:09 PM MDT	Red Flag Warning	GJT	30 hr
Jun 17, 2:56 PM MDT	Fire Weather Watch	GJT	22 hr
Jun 18, 1:01 PM MDT	Red Flag Warning	GJT	31 hr
Jun 19, 11:22 AM MDT	Special Weather Statement	GJT	38 min
Jun 23, 1:57 PM MDT	Mesoscale Discussion	SPC	93 min
Jun 23, 6:36 PM MDT	Special Weather Statement	GJT	24 min
Jun 23, 7:04 PM MDT	Special Weather Statement	GJT	41 min
Jun 23, 8:03 PM MDT	Special Weather Statement	GJT	42 min
Jun 25, 11:59 AM MDT	Flood Watch	SLC	31 hr
Jun 26, 1:43 PM MDT	Special Weather Statement	GJT	32 min
Jun 28, 12:55 PM MDT	Special Weather Statement	GJT	35 min
Jun 29, 2:59 PM MDT	Flood Watch	GJT	28 hr
Jun 29, 3:18 PM MDT	Flood Watch	SLC	28 hr
Jul 1, 1:59 AM MDT	Red Flag Warning	SLC	4 days
Jul 2, 1:53 PM MDT	Flash Flood Warning Considerable damage threat	GJT	112 min
Jul 6, 3:36 PM MDT	Special Weather Statement	GJT	24 min
Jul 10, 2:26 PM MDT	Areal Flood Advisory	GJT	2 hr
Jul 14, 2:42 PM MDT	Flood Watch	SLC	30 hr
Jul 15, 5:31 PM MDT	Flash Flood Warning Considerable damage threat	SLC	3 hr
Jul 16, 1:11 PM MDT	Areal Flood Advisory	GJT	3 hr
Jul 16, 2:26 PM MDT	Heat Advisory	GJT	30 hr
Jul 16, 3:50 PM MDT	Excessive Heat Warning	SLC	28 hr
Jul 19, 3:20 PM MDT	Excessive Heat Watch	SLC	12 hr
Jul 20, 3:10 AM MDT	Excessive Heat Warning	SLC	4 days
Jul 20, 2:13 PM MDT	Excessive Heat Watch	GJT	13 hr
Jul 21, 3:19 AM MDT	Heat Advisory	GJT	65 hr
Jul 24, 2:38 PM MDT	Areal Flood Advisory	GJT	3 hr
Jul 24, 3:04 PM MDT	Flood Watch	SLC	5 days
Jul 26, 3:15 PM MDT	Flash Flood Warning Considerable damage threat	GJT	3 hr
Jul 26, 4:34 PM MDT	Areal Flood Advisory	GJT	3 hr
Jul 27, 2:11 AM MDT	Flood Watch	GJT	22 hr
Jul 27, 3:23 PM MDT	Flood Watch	GJT	31 hr
Jul 27, 4:40 PM MDT	Areal Flood Advisory	GJT	3 hr
Jul 27, 5:47 PM MDT	Areal Flood Advisory	GJT	3 hr
Jul 27, 6:25 PM MDT	Areal Flood Advisory	GJT	2 hr
Jul 28, 2:10 PM MDT	Flood Watch	GJT	32 hr
Jul 30, 2:34 PM MDT	Flash Flood Warning Considerable damage threat	GJT	3 hr
Jul 30, 4:16 PM MDT	Areal Flood Advisory	GJT	3 hr
Jul 30, 6:22 PM MDT	Areal Flood Advisory	GJT	3 hr
Jul 31, 10:48 AM MDT	Flash Flood Watch	GJT	4 hr
Jul 31, 2:33 PM MDT	Flash Flood Warning Considerable damage threat	GJT	3 hr
Jul 31, 3:49 PM MDT	Areal Flood Advisory	GJT	3 hr
Aug 1, 2:08 AM MDT	Areal Flood Advisory	GJT	3 hr
Aug 1, 11:43 AM MDT	Flash Flood Watch	GJT	9 hr
Aug 11, 6:35 PM MDT	Flash Flood Warning Considerable damage threat	GJT	6 hr
Aug 11, 7:03 PM MDT	Flash Flood Warning	GJT	3 hr
Aug 12, 2:58 PM MDT	Flash Flood Watch	GJT	3 hr
Aug 12, 5:06 PM MDT	Areal Flood Advisory	GJT	108 min
Aug 14, 12:09 PM MDT	Flash Flood Watch	GJT	9 hr
Aug 14, 1:23 PM MDT	Flood Watch	SLC	32 hr
Aug 14, 1:30 PM MDT	Areal Flood Advisory	GJT	30 min
Aug 14, 2:00 PM MDT	Flash Flood Warning	GJT	3 hr
Aug 14, 4:23 PM MDT	Areal Flood Advisory	GJT	3 hr
Aug 14, 4:33 PM MDT	Flash Flood Warning	GJT	117 min
Aug 14, 6:02 PM MDT	Areal Flood Advisory	GJT	3 hr
Aug 15, 10:35 AM MDT	Flood Watch	GJT	11 hr
Aug 15, 3:51 PM MDT	Areal Flood Advisory	GJT	3 hr
Aug 15, 5:34 PM MDT	Flash Flood Warning Considerable damage threat	GJT	4 hr
Aug 15, 7:17 PM MDT	Areal Flood Advisory	GJT	3 hr
Aug 16, 12:50 PM MDT	Flash Flood Watch	GJT	6 hr
Aug 17, 1:41 PM MDT	Flood Watch	SLC	31 hr
Aug 19, 2:46 AM MDT	Flash Flood Watch	GJT	16 hr
Aug 20, 6:32 PM MDT	Areal Flood Advisory	GJT	18 min
Aug 20, 6:47 PM MDT	Flash Flood Warning Considerable damage threat	SLC	3 hr
Aug 20, 6:50 PM MDT	Flash Flood Warning	GJT	100 min
Aug 20, 7:10 PM MDT	Flash Flood Warning	GJT	4 hr
Aug 26, 12:54 PM MDT	Areal Flood Advisory	GJT	2 hr
Aug 27, 3:22 PM MDT	Special Weather Statement	GJT	23 min
Aug 31, 2:21 PM MDT	Excessive Heat Warning	SLC	8 days
Sep 19, 1:40 PM MDT	Flood Watch	SLC	58 hr
Sep 19, 1:49 PM MDT	Flood Watch	GJT	3 days
Sep 30, 12:02 PM MDT	Mesoscale Discussion	SPC	118 min
Oct 1, 12:32 PM MDT	Mesoscale Discussion	SPC	3 hr
Oct 1, 5:27 PM MDT	Mesoscale Discussion	SPC	2 hr
Oct 1, 6:17 PM MDT	Severe Thunderstorm Warning	SLC	28 min
Oct 1, 6:27 PM MDT	Flash Flood Warning Considerable damage threat	SLC	4 hr
Oct 1, 6:44 PM MDT	Severe Thunderstorm Warning	SLC	31 min
Oct 1, 7:06 PM MDT	Severe Thunderstorm Warning	GJT	24 min
Oct 1, 7:29 PM MDT	Severe Thunderstorm Warning	GJT	31 min
Oct 1, 7:59 PM MDT	Special Weather Statement	GJT	31 min
Oct 1, 9:25 PM MDT	Special Weather Statement	GJT	35 min
Oct 2, 12:08 PM MDT	Mesoscale Discussion	SPC	3 hr
Oct 2, 4:03 PM MDT	Severe Thunderstorm Warning	GJT	27 min
Oct 2, 4:28 PM MDT	Severe Thunderstorm Warning	GJT	32 min
Oct 2, 4:30 PM MDT	Severe Thunderstorm Warning	GJT	30 min
Oct 2, 4:31 PM MDT	Severe Thunderstorm Warning	GJT	29 min
Oct 2, 5:16 PM MDT	Mesoscale Discussion	SPC	89 min
Oct 2, 5:32 PM MDT	Areal Flood Advisory	GJT	3 hr
Oct 2, 5:32 PM MDT	Severe Thunderstorm Warning	SLC	28 min
Oct 2, 5:37 PM MDT	Flash Flood Warning Considerable damage threat	SLC	3 hr
Oct 2, 6:25 PM MDT	Severe Thunderstorm Warning	SLC	21 min
Oct 2, 6:26 PM MDT	Severe Thunderstorm Warning	SLC	34 min
Oct 2, 6:35 PM MDT	Special Weather Statement	GJT	25 min
Oct 2, 7:04 PM MDT	Special Weather Statement	GJT	26 min
Oct 2, 7:34 PM MDT	Special Weather Statement	GJT	26 min
Oct 2, 8:10 PM MDT	Special Weather Statement	GJT	35 min
Oct 20, 12:28 PM MDT	Wind Advisory	SLC	59 hr
Oct 21, 3:06 PM MDT	Wind Advisory	GJT	45 hr
Oct 22, 4:22 AM MDT	Winter Weather Advisory	GJT	47 hr
Oct 23, 4:37 AM MDT	Freeze Watch	GJT	4 hr
Oct 23, 8:57 AM MDT	Freeze Warning	GJT	24 hr
Oct 23, 8:57 AM MDT	Freeze Warning	GJT	49 hr
Nov 1, 2:08 PM MDT	Winter Weather Advisory	GJT	64 hr
Nov 8, 2:54 AM MST	Winter Weather Advisory	GJT	57 hr
Nov 8, 1:45 PM MST	Wind Advisory	GJT	27 hr
Nov 27, 1:27 PM MST	Winter Weather Advisory	GJT	46 hr
Dec 1, 3:01 AM MST	Wind Advisory	GJT	35 hr
Dec 5, 2:33 PM MST	Winter Weather Advisory	GJT	63 hr
Dec 11, 2:55 AM MST	Winter Weather Advisory	GJT	4 days
Dec 26, 3:06 AM MST	Winter Storm Watch	GJT	11 hr
Dec 26, 1:56 PM MST	Winter Storm Warning	GJT	63 hr
Dec 26, 1:56 PM MST	Winter Weather Advisory	GJT	63 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	11
Mesoscale Discussion	6
Special Weather Statement	17
Flooding
Flash Flood Warning	15
Flash Flood Watch	6
Flood Watch	13
Areal Flood Advisory	20
Winter
Winter Storm Warning	2
Winter Storm Watch	3
Winter Weather Advisory	11
Heat
Excessive Heat Warning	3
Excessive Heat Watch	2
Heat Advisory	4
Cold
Freeze Warning	5
Freeze Watch	2
Wind and dust
High Wind Warning	5
High Wind Watch	1
Blowing Dust Advisory	1
Wind Advisory	31
Fire
Red Flag Warning	17
Fire Weather Watch	12

The busiest days

Days with the most alerts issued, by UTC date.

Nearby

Alerts in force now Tornadoes on record Forecast The radar archive 2021 2023

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.