Alert archive / Colorado / Washington County

Weather alerts in Washington County, Colorado, 2024

237 weather alerts in 2024, from the National Weather Service and the Storm Prediction Center. An alert counts here when it covered this county.

Washington County and its neighbors

Each county as a circle sized by its count in 2024. Tap one for its archive.

Alerts: 237
Warnings: 107
Watches: 33
Advisories: 25
Busiest month: August50 alerts
Busiest day: May 21, 202418 alerts

Over time

By month

Warning verification

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

0 of 13 tornado warnings covering Washington County in 2024 had a tornado report inside them; 0 of 2 tornado reports fell inside a warning.

Washington County, 2024

	Warnings	With a report	False alarm ratio	Reports	Inside a warning	Mean lead time
Tornado warnings	13	0	100%	2	0%
Severe thunderstorm warnings	69	22	68%	35	69%	29 min
Flash flood warnings	4	3	25%	0

Each office's whole area, 2024

	Warnings	With a report	False alarm ratio	Reports	Inside a warning	Mean lead time
NWS Denver/Boulder, CO: tornado warnings	27	2	93%	15	20%	11 min
NWS Denver/Boulder, CO: severe thunderstorm warnings	295	119	60%	339	79%	20 min
NWS Denver/Boulder, CO: flash flood warnings	32	9	72%	14	79%	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 3, 2:25 PM MST	Dense Fog Advisory	BOU	19 hr
Jan 11, 3:10 AM MST	Wind Chill Watch	BOU	23 hr
Jan 12, 2:10 AM MST	Wind Chill Warning	BOU	4 days
Jan 23, 1:25 PM MST	Dense Fog Advisory	BOU	20 hr
Feb 2, 7:55 PM MST	Dense Fog Advisory	BOU	12 hr
Feb 3, 5:53 PM MST	Dense Fog Advisory	BOU	16 hr
Feb 9, 12:47 PM MST	Winter Weather Advisory	BOU	40 hr
Feb 15, 2:22 AM MST	Dense Fog Advisory	BOU	8 hr
Feb 24, 1:43 PM MST	Red Flag Warning	BOU	34 hr
Feb 25, 1:32 PM MST	Red Flag Warning	BOU	28 hr
Feb 27, 9:12 AM MST	Mesoscale Discussion	SPC	3 hr
Feb 29, 12:10 PM MST	Fire Weather Watch	BOU	19 hr
Mar 1, 6:46 AM MST	Red Flag Warning	BOU	36 hr
Mar 3, 4:19 AM MST	Red Flag Warning	BOU	14 hr
Mar 7, 1:50 AM MST	Winter Storm Warning	BOU	15 hr
Mar 7, 1:50 AM MST	Winter Weather Advisory	BOU	39 hr
Mar 7, 9:42 AM MST	Mesoscale Discussion	SPC	4 hr
Mar 23, 3:22 AM MDT	Winter Weather Advisory	BOU	57 hr
Mar 23, 2:55 PM MDT	High Wind Watch	BOU	23 hr
Mar 24, 3:53 AM MDT	Winter Storm Watch	BOU	10 hr
Apr 2, 2:33 PM MDT	Fire Weather Watch	BOU	47 hr
Apr 4, 4:25 AM MDT	Red Flag Warning	BOU	41 hr
Apr 4, 2:58 PM MDT	High Wind Watch	BOU	36 hr
Apr 5, 11:50 AM MDT	High Wind Warning	BOU	54 hr
Apr 5, 1:37 PM MDT	Red Flag Warning	BOU	53 hr
Apr 14, 1:05 AM MDT	Red Flag Warning	BOU	19 hr
Apr 14, 3:30 AM MDT	Fire Weather Watch	BOU	11 hr
Apr 14, 2:13 PM MDT	Red Flag Warning	BOU	30 hr
Apr 15, 3:15 AM MDT	High Wind Watch	BOU	11 hr
Apr 15, 2:18 PM MDT	High Wind Warning	BOU	28 hr
Apr 25, 1:23 PM MDT	Mesoscale Discussion	SPC	3 hr
Apr 25, 1:53 PM MDT	Tornado Watch	SPC	7 hr
Apr 25, 2:54 PM MDT	Severe Thunderstorm Warning	BOU	51 min
Apr 25, 3:27 PM MDT	Tornado Warning Tornado observed	BOU	18 min
Apr 25, 3:56 PM MDT	Severe Thunderstorm Warning	BOU	49 min
Apr 25, 4:16 PM MDT	Severe Thunderstorm Warning	BOU	29 min
Apr 25, 4:42 PM MDT	Mesoscale Discussion	SPC	2 hr
May 1, 5:22 PM MDT	Special Weather Statement	BOU	38 min
May 1, 6:23 PM MDT	Special Weather Statement	BOU	37 min
May 6, 1:24 PM MDT	Freeze Watch	BOU	23 hr
May 7, 4:07 PM MDT	Frost Advisory	BOU	16 hr
May 19, 12:57 PM MDT	Severe Thunderstorm Watch	SPC	7 hr
May 19, 1:22 PM MDT	Special Weather Statement	BOU	38 min
May 19, 2:50 PM MDT	Mesoscale Discussion	SPC	85 min
May 20, 2:47 PM MDT	Mesoscale Discussion	SPC	2 hr
May 20, 4:07 PM MDT	Tornado Watch	SPC	7 hr
May 20, 6:13 PM MDT	Mesoscale Discussion	SPC	2 hr
May 20, 6:53 PM MDT	Severe Thunderstorm Warning Considerable damage threat	BOU	52 min
May 20, 6:56 PM MDT	Tornado Warning	BOU	34 min
May 20, 7:30 PM MDT	Tornado Warning	BOU	30 min
May 20, 7:36 PM MDT	Severe Thunderstorm Warning Considerable damage threat	BOU	24 min
May 20, 7:49 PM MDT	Tornado Warning	BOU	26 min
May 20, 7:56 PM MDT	Tornado Warning	BOU	34 min
May 20, 8:02 PM MDT	Severe Thunderstorm Warning Considerable damage threat	BOU	43 min
May 20, 8:14 PM MDT	Tornado Warning	BOU	31 min
May 20, 8:29 PM MDT	Severe Thunderstorm Warning Destructive damage threat	BOU	46 min
May 20, 8:41 PM MDT	Tornado Warning	BOU	34 min
May 20, 8:44 PM MDT	Severe Thunderstorm Warning	BOU	46 min
May 20, 9:07 PM MDT	Flash Flood Warning	BOU	3 hr
May 20, 9:12 PM MDT	Severe Thunderstorm Warning	BOU	48 min
May 20, 9:16 PM MDT	Tornado Warning	BOU	29 min
May 20, 9:44 PM MDT	Severe Thunderstorm Warning Considerable damage threat	BOU	46 min
May 20, 9:56 PM MDT	Tornado Warning	BOU	34 min
May 20, 10:26 PM MDT	Severe Thunderstorm Warning Considerable damage threat	BOU	34 min
May 21, 7:03 PM MDT	Frost Advisory	BOU	13 hr
May 25, 5:08 PM MDT	Severe Thunderstorm Warning	BOU	37 min
May 28, 7:20 PM MDT	Special Weather Statement	BOU	25 min
May 28, 7:46 PM MDT	Severe Thunderstorm Warning	BOU	29 min
May 28, 8:11 PM MDT	Severe Thunderstorm Warning	BOU	49 min
May 29, 12:18 PM MDT	Mesoscale Discussion	SPC	117 min
May 29, 2:27 PM MDT	Mesoscale Discussion	SPC	2 hr
May 29, 2:57 PM MDT	Severe Thunderstorm Watch	SPC	6 hr
May 29, 4:49 PM MDT	Special Weather Statement	BOU	41 min
May 29, 4:55 PM MDT	Mesoscale Discussion	SPC	2 hr
May 29, 5:01 PM MDT	Severe Thunderstorm Warning	BOU	44 min
May 29, 5:05 PM MDT	Severe Thunderstorm Warning	BOU	40 min
May 29, 5:46 PM MDT	Severe Thunderstorm Warning	BOU	44 min
May 29, 6:27 PM MDT	Severe Thunderstorm Warning Considerable damage threat	BOU	48 min
May 29, 7:02 PM MDT	Severe Thunderstorm Warning	BOU	28 min
May 29, 7:11 PM MDT	Flash Flood Warning	BOU	3 hr
May 30, 10:27 PM MDT	Severe Thunderstorm Warning	BOU	63 min
May 30, 11:32 PM MDT	Severe Thunderstorm Warning	BOU	58 min
May 31, 5:44 PM MDT	Mesoscale Discussion	SPC	91 min
Jun 1, 1:08 PM MDT	Mesoscale Discussion	SPC	97 min
Jun 1, 2:00 PM MDT	Severe Thunderstorm Watch	SPC	6 hr
Jun 1, 3:01 PM MDT	Special Weather Statement	BOU	44 min
Jun 1, 3:18 PM MDT	Special Weather Statement	BOU	42 min
Jun 1, 3:54 PM MDT	Mesoscale Discussion	SPC	66 min
Jun 1, 4:40 PM MDT	Severe Thunderstorm Warning	BOU	50 min
Jun 1, 5:43 PM MDT	Severe Thunderstorm Warning Considerable damage threat	BOU	47 min
Jun 2, 1:51 PM MDT	Mesoscale Discussion	SPC	39 min
Jun 2, 2:22 PM MDT	Severe Thunderstorm Watch	SPC	8 hr
Jun 2, 4:19 PM MDT	Special Weather Statement	BOU	26 min
Jun 8, 11:51 AM MDT	Mesoscale Discussion	SPC	114 min
Jun 8, 12:26 PM MDT	Severe Thunderstorm Watch	SPC	9 hr
Jun 8, 2:06 PM MDT	Severe Thunderstorm Warning	BOU	39 min
Jun 8, 2:44 PM MDT	Severe Thunderstorm Warning	BOU	31 min
Jun 8, 3:14 PM MDT	Severe Thunderstorm Warning	BOU	46 min
Jun 8, 3:58 PM MDT	Severe Thunderstorm Warning Considerable damage threat	BOU	47 min
Jun 8, 4:20 PM MDT	Tornado Warning	BOU	25 min
Jun 8, 4:26 PM MDT	Severe Thunderstorm Warning	BOU	49 min
Jun 8, 4:39 PM MDT	Mesoscale Discussion	SPC	2 hr
Jun 8, 4:55 PM MDT	Areal Flood Advisory	BOU	3 hr
Jun 8, 5:07 PM MDT	Severe Thunderstorm Warning	BOU	23 min
Jun 8, 5:11 PM MDT	Severe Thunderstorm Warning	BOU	49 min
Jun 8, 5:25 PM MDT	Severe Thunderstorm Warning Considerable damage threat	BOU	35 min
Jun 8, 5:26 PM MDT	Areal Flood Advisory	BOU	2 hr
Jun 13, 5:18 PM MDT	Severe Thunderstorm Warning	BOU	27 min
Jun 13, 5:43 PM MDT	Severe Thunderstorm Warning	BOU	47 min
Jun 14, 1:44 PM MDT	Mesoscale Discussion	SPC	61 min
Jun 14, 2:10 PM MDT	Severe Thunderstorm Watch	SPC	7 hr
Jun 14, 4:28 PM MDT	Severe Thunderstorm Warning	BOU	47 min
Jun 14, 4:30 PM MDT	Severe Thunderstorm Warning	BOU	45 min
Jun 14, 4:51 PM MDT	Severe Thunderstorm Warning	BOU	39 min
Jun 14, 5:14 PM MDT	Special Weather Statement	BOU	46 min
Jun 14, 5:15 PM MDT	Severe Thunderstorm Warning	BOU	32 min
Jun 14, 5:32 PM MDT	Severe Thunderstorm Warning	BOU	31 min
Jun 15, 6:52 PM MDT	Special Weather Statement	BOU	23 min
Jun 15, 7:15 PM MDT	Special Weather Statement	BOU	45 min
Jun 15, 7:42 PM MDT	Severe Thunderstorm Warning	BOU	33 min
Jun 15, 7:54 PM MDT	Severe Thunderstorm Warning	BOU	36 min
Jun 15, 8:07 PM MDT	Severe Thunderstorm Warning Considerable damage threat	BOU	23 min
Jun 16, 2:42 PM MDT	Fire Weather Watch	BOU	12 hr
Jun 16, 2:42 PM MDT	Red Flag Warning	BOU	30 hr
Jun 16, 7:38 PM MDT	Mesoscale Discussion	SPC	2 hr
Jun 24, 3:02 PM MDT	Special Weather Statement	BOU	28 min
Jun 27, 9:11 PM MDT	Special Weather Statement	BOU	49 min
Jun 28, 2:56 PM MDT	Mesoscale Discussion	SPC	2 hr
Jun 30, 3:54 PM MDT	Mesoscale Discussion	SPC	96 min
Jul 3, 12:41 PM MDT	Severe Thunderstorm Watch	SPC	6 hr
Jul 3, 2:45 PM MDT	Special Weather Statement	BOU	2 hr
Jul 3, 2:57 PM MDT	Mesoscale Discussion	SPC	2 hr
Jul 3, 3:46 PM MDT	Severe Thunderstorm Warning	BOU	44 min
Jul 3, 3:58 PM MDT	Tornado Warning	BOU	17 min
Jul 3, 4:27 PM MDT	Severe Thunderstorm Warning	BOU	28 min
Jul 7, 2:12 PM MDT	Mesoscale Discussion	SPC	3 hr
Jul 7, 2:47 PM MDT	Severe Thunderstorm Warning	BOU	28 min
Jul 7, 2:51 PM MDT	Severe Thunderstorm Watch	SPC	8 hr
Jul 7, 3:39 PM MDT	Special Weather Statement	BOU	36 min
Jul 7, 4:03 PM MDT	Severe Thunderstorm Warning	BOU	42 min
Jul 10, 12:24 PM MDT	Heat Advisory	BOU	3 days
Jul 10, 12:24 PM MDT	Heat Advisory	BOU	4 days
Jul 11, 4:22 PM MDT	Mesoscale Discussion	SPC	113 min
Jul 11, 8:11 PM MDT	Special Weather Statement	BOU	49 min
Jul 12, 3:31 PM MDT	Special Weather Statement	BOU	29 min
Jul 12, 3:59 PM MDT	Special Weather Statement	BOU	31 min
Jul 12, 4:30 PM MDT	Special Weather Statement	BOU	30 min
Jul 14, 6:02 PM MDT	Special Weather Statement	BOU	58 min
Jul 15, 2:49 PM MDT	Mesoscale Discussion	SPC	86 min
Jul 17, 12:20 PM MDT	Mesoscale Discussion	SPC	115 min
Jul 17, 2:49 PM MDT	Mesoscale Discussion	SPC	116 min
Jul 17, 4:49 PM MDT	Severe Thunderstorm Warning	BOU	41 min
Jul 18, 7:05 PM MDT	Severe Thunderstorm Warning	BOU	40 min
Jul 19, 4:49 PM MDT	Special Weather Statement	BOU	41 min
Jul 19, 5:28 PM MDT	Special Weather Statement	BOU	47 min
Jul 19, 5:35 PM MDT	Severe Thunderstorm Warning	BOU	25 min
Jul 20, 1:57 PM MDT	Mesoscale Discussion	SPC	3 hr
Jul 20, 2:40 PM MDT	Severe Thunderstorm Warning Considerable damage threat	BOU	35 min
Jul 20, 3:12 PM MDT	Severe Thunderstorm Warning Considerable damage threat	BOU	33 min
Jul 20, 5:03 PM MDT	Special Weather Statement	BOU	27 min
Jul 20, 6:22 PM MDT	Special Weather Statement	BOU	38 min
Jul 21, 6:25 PM MDT	Special Weather Statement	BOU	35 min
Jul 21, 7:03 PM MDT	Special Weather Statement	BOU	27 min
Jul 21, 8:11 PM MDT	Special Weather Statement	BOU	34 min
Jul 27, 3:16 PM MDT	Mesoscale Discussion	SPC	119 min
Aug 2, 6:13 PM MDT	Special Weather Statement	BOU	47 min
Aug 2, 6:27 PM MDT	Severe Thunderstorm Warning	BOU	48 min
Aug 2, 7:08 PM MDT	Severe Thunderstorm Warning	BOU	37 min
Aug 2, 7:12 PM MDT	Special Weather Statement	BOU	48 min
Aug 2, 7:29 PM MDT	Severe Thunderstorm Warning	BOU	46 min
Aug 7, 12:57 PM MDT	Mesoscale Discussion	SPC	2 hr
Aug 7, 2:18 PM MDT	Severe Thunderstorm Watch	SPC	9 hr
Aug 7, 5:30 PM MDT	Mesoscale Discussion	SPC	2 hr
Aug 11, 1:17 PM MDT	Mesoscale Discussion	SPC	118 min
Aug 11, 2:41 PM MDT	Severe Thunderstorm Watch	SPC	6 hr
Aug 12, 1:20 AM MDT	Dense Fog Advisory	BOU	8 hr
Aug 12, 9:50 AM MDT	Flood Watch	BOU	14 hr
Aug 12, 7:09 PM MDT	Flash Flood Warning	BOU	3 hr
Aug 12, 10:06 PM MDT	Areal Flood Warning	BOU	3 hr
Aug 13, 4:31 PM MDT	Mesoscale Discussion	SPC	59 min
Aug 13, 4:52 PM MDT	Severe Thunderstorm Watch	SPC	8 hr
Aug 13, 5:18 PM MDT	Severe Thunderstorm Warning	BOU	42 min
Aug 13, 5:25 PM MDT	Severe Thunderstorm Warning	BOU	50 min
Aug 13, 5:57 PM MDT	Severe Thunderstorm Warning	BOU	48 min
Aug 13, 6:06 PM MDT	Tornado Warning	BOU	24 min
Aug 13, 6:34 PM MDT	Areal Flood Advisory	BOU	3 hr
Aug 13, 6:35 PM MDT	Severe Thunderstorm Warning	BOU	40 min
Aug 13, 6:46 PM MDT	Areal Flood Advisory	BOU	3 hr
Aug 13, 7:12 PM MDT	Severe Thunderstorm Warning	BOU	33 min
Aug 13, 7:13 PM MDT	Severe Thunderstorm Warning	BOU	32 min
Aug 13, 7:18 PM MDT	Mesoscale Discussion	SPC	87 min
Aug 13, 7:24 PM MDT	Areal Flood Advisory	BOU	3 hr
Aug 13, 7:31 PM MDT	Tornado Warning	BOU	29 min
Aug 19, 1:19 PM MDT	Mesoscale Discussion	SPC	86 min
Aug 19, 1:43 PM MDT	Severe Thunderstorm Watch	SPC	7 hr
Aug 19, 2:15 PM MDT	Severe Thunderstorm Warning	BOU	45 min
Aug 19, 2:57 PM MDT	Severe Thunderstorm Warning	BOU	48 min
Aug 19, 3:36 PM MDT	Areal Flood Advisory	BOU	3 hr
Aug 19, 3:41 PM MDT	Severe Thunderstorm Warning Considerable damage threat	BOU	49 min
Aug 19, 3:53 PM MDT	Flash Flood Warning	BOU	3 hr
Aug 19, 6:07 PM MDT	Mesoscale Discussion	SPC	53 min
Aug 19, 6:18 PM MDT	Severe Thunderstorm Warning	BOU	42 min
Aug 19, 7:01 PM MDT	Areal Flood Advisory	BOU	3 hr
Aug 19, 7:29 PM MDT	Special Weather Statement	BOU	31 min
Aug 19, 8:25 PM MDT	Areal Flood Advisory	BOU	3 hr
Aug 22, 4:51 PM MDT	Mesoscale Discussion	SPC	114 min
Aug 22, 5:24 PM MDT	Severe Thunderstorm Watch	SPC	6 hr
Aug 22, 7:44 PM MDT	Mesoscale Discussion	SPC	2 hr
Aug 22, 8:29 PM MDT	Severe Thunderstorm Warning	BOU	22 min
Aug 22, 9:09 PM MDT	Areal Flood Advisory	BOU	3 hr
Aug 23, 3:08 PM MDT	Special Weather Statement	BOU	37 min
Aug 23, 4:53 PM MDT	Mesoscale Discussion	SPC	97 min
Aug 23, 5:21 PM MDT	Severe Thunderstorm Warning	BOU	39 min
Aug 23, 5:54 PM MDT	Severe Thunderstorm Warning	BOU	51 min
Aug 24, 3:39 PM MDT	Special Weather Statement	BOU	66 min
Sep 10, 2:01 PM MDT	Fire Weather Watch	BOU	24 hr
Sep 11, 2:14 PM MDT	Red Flag Warning	BOU	30 hr
Sep 17, 1:08 PM MDT	Mesoscale Discussion	SPC	3 hr
Sep 17, 2:54 PM MDT	Severe Thunderstorm Watch	SPC	6 hr
Sep 17, 4:04 PM MDT	Severe Thunderstorm Warning	BOU	41 min
Sep 17, 4:29 PM MDT	Severe Thunderstorm Warning	BOU	28 min
Sep 17, 4:39 PM MDT	Severe Thunderstorm Warning	BOU	36 min
Sep 29, 1:13 PM MDT	Fire Weather Watch	BOU	39 hr
Oct 3, 12:38 PM MDT	Frost Advisory	BOU	19 hr
Oct 3, 2:18 PM MDT	Fire Weather Watch	BOU	23 hr
Oct 4, 1:27 PM MDT	Red Flag Warning	BOU	30 hr
Oct 16, 2:31 AM MDT	Fire Weather Watch	BOU	11 hr
Oct 16, 1:36 PM MDT	Red Flag Warning	BOU	28 hr
Oct 24, 2:56 AM MDT	Frost Advisory	BOU	30 hr
Oct 24, 3:04 AM MDT	Red Flag Warning	BOU	15 hr
Oct 28, 2:43 PM MDT	Red Flag Warning	BOU	27 hr
Nov 5, 3:38 AM MST	Winter Weather Advisory	BOU	61 hr
Nov 5, 2:17 PM MST	Winter Storm Warning	BOU	4 days
Nov 7, 3:51 AM MST	Winter Storm Watch	BOU	10 hr
Nov 8, 12:51 PM MST	Mesoscale Discussion	SPC	4 hr
Dec 28, 2:12 PM MST	High Wind Watch	BOU	24 hr
Dec 29, 2:17 PM MST	High Wind Warning	BOU	27 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	69
Tornado Warning	13
Severe Thunderstorm Watch	14
Tornado Watch	2
Mesoscale Discussion	40
Special Weather Statement	32
Flooding
Areal Flood Warning	1
Flash Flood Warning	4
Flood Watch	1
Areal Flood Advisory	9
Winter
Winter Storm Warning	2
Winter Storm Watch	2
Winter Weather Advisory	4
Heat
Heat Advisory	2
Cold
Wind Chill Warning	1
Freeze Watch	1
Wind Chill Watch	1
Frost Advisory	4
Wind and dust
High Wind Warning	3
High Wind Watch	4
Fire
Red Flag Warning	14
Fire Weather Watch	8
Fog and smoke
Dense Fog Advisory	6

The busiest days

Days with the most alerts issued, by UTC date.

Nearby

Alerts in force now Tornadoes on record Forecast The radar archive 2023 2025

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.