Alert archive / Wyoming / Fremont County

Weather alerts in Fremont County, Wyoming, 2026

189 weather alerts in 2026, from the National Weather Service and the Storm Prediction Center. An alert counts here when it covered this county.

Fremont County and its neighbors

Each county as a circle sized by its count in 2026. Tap one for its archive.

Alerts: 189
Warnings: 65
Watches: 32
Advisories: 37
Busiest month: July34 alerts
Busiest day: June 25, 202615 alerts

Over time

By month

Warning verification

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

1 of 1 tornado warnings covering Fremont County in 2026 had a tornado report inside them; 1 of 2 tornado reports fell inside a warning, on average 2 minutes after it went out.

Fremont County, 2026

	Warnings	With a report	False alarm ratio	Reports	Inside a warning	Mean lead time
Tornado warnings	1	1	0%	2	50%	2 min
Severe thunderstorm warnings	25	9	64%	22	41%	21 min
Flash flood warnings	1	0	100%	0

Each office's whole area, 2026

	Warnings	With a report	False alarm ratio	Reports	Inside a warning	Mean lead time
NWS Riverton, WY: tornado warnings	1	1	0%	3	33%	2 min
NWS Riverton, WY: severe thunderstorm warnings	63	19	70%	127	31%	26 min
NWS Riverton, WY: flash flood warnings	3	2	33%	3	67%	79 min

An office's figures cover every county it serves, including across state lines.

The year is still running; reports filed late and damage surveys can still change these figures.

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 1, 1:45 AM MST	Winter Weather Advisory	RIW	34 hr
Jan 3, 1:27 AM MST	Winter Weather Advisory	RIW	58 hr
Jan 5, 1:47 PM MST	Winter Weather Advisory	RIW	51 hr
Feb 8, 1:14 AM MST	Winter Weather Advisory	RIW	40 hr
Feb 10, 12:04 AM MST	Winter Weather Advisory	RIW	41 hr
Feb 15, 10:34 AM MST	High Wind Watch	RIW	23 hr
Feb 15, 10:43 AM MST	Winter Weather Advisory	RIW	50 hr
Feb 16, 9:40 AM MST	High Wind Warning	RIW	33 hr
Feb 17, 12:16 PM MST	Winter Weather Advisory	RIW	47 hr
Feb 22, 11:23 AM MST	High Wind Watch	RIW	13 hr
Feb 22, 11:42 AM MST	Winter Storm Watch	RIW	14 hr
Feb 23, 12:45 AM MST	High Wind Warning	RIW	40 hr
Feb 23, 1:12 AM MST	Winter Storm Warning	RIW	64 hr
Feb 23, 1:12 AM MST	Winter Weather Advisory	RIW	59 hr
Feb 23, 2:56 AM MST	High Wind Watch	RIW	33 hr
Feb 24, 11:51 AM MST	High Wind Warning	RIW	31 hr
Feb 25, 2:51 AM MST	High Wind Watch	RIW	23 hr
Feb 26, 1:59 AM MST	High Wind Warning	RIW	40 hr
Feb 27, 12:05 AM MST	Red Flag Warning	RIW	18 hr
Mar 4, 1:16 PM MST	Winter Weather Advisory	RIW	51 hr
Mar 7, 1:48 AM MST	High Wind Watch	RIW	10 hr
Mar 7, 11:34 AM MST	High Wind Warning	RIW	34 hr
Mar 8, 1:45 AM MST	High Wind Watch	RIW	23 hr
Mar 9, 2:00 AM MDT	High Wind Warning	RIW	19 hr
Mar 10, 11:36 AM MDT	High Wind Watch	RIW	23 hr
Mar 11, 2:24 AM MDT	Winter Storm Watch	RIW	8 hr
Mar 11, 3:01 AM MDT	High Wind Warning	RIW	45 hr
Mar 11, 10:51 AM MDT	Winter Weather Advisory	RIW	37 hr
Mar 13, 1:53 AM MDT	High Wind Watch	RIW	11 hr
Mar 13, 2:12 AM MDT	Winter Storm Watch	RIW	11 hr
Mar 13, 12:54 PM MDT	High Wind Warning	RIW	34 hr
Mar 13, 1:23 PM MDT	Winter Weather Advisory	RIW	34 hr
Mar 14, 6:43 PM MDT	Mesoscale Discussion	SPC	4 hr
Mar 17, 2:23 AM MDT	Fire Weather Watch	RIW	11 hr
Mar 17, 1:19 PM MDT	Red Flag Warning	RIW	61 hr
Mar 20, 2:02 AM MDT	Red Flag Warning	RIW	43 hr
Mar 23, 2:48 AM MDT	Fire Weather Watch	RIW	33 hr
Mar 24, 11:29 AM MDT	Red Flag Warning	RIW	58 hr
Mar 27, 1:24 AM MDT	Fire Weather Watch	RIW	13 hr
Mar 27, 2:02 PM MDT	Red Flag Warning	RIW	3 days
Apr 1, 1:47 AM MDT	Winter Storm Watch	RIW	9 hr
Apr 1, 11:14 AM MDT	Winter Storm Warning	RIW	55 hr
Apr 2, 2:17 AM MDT	Winter Weather Advisory	RIW	40 hr
Apr 7, 12:47 AM MDT	Red Flag Warning	RIW	20 hr
Apr 11, 2:44 PM MDT	Mesoscale Discussion	SPC	2 hr
Apr 11, 4:18 PM MDT	Special Weather Statement	RIW	27 min
Apr 11, 5:21 PM MDT	Special Weather Statement	RIW	54 min
Apr 12, 3:19 PM MDT	Special Weather Statement	RIW	26 min
Apr 12, 4:40 PM MDT	Special Weather Statement	RIW	35 min
Apr 14, 1:10 AM MDT	Winter Storm Watch	RIW	24 hr
Apr 15, 12:40 AM MDT	Winter Storm Warning	RIW	53 hr
Apr 15, 11:56 AM MDT	Winter Weather Advisory	RIW	46 hr
Apr 16, 1:35 PM MDT	Freeze Warning	RIW	43 hr
Apr 19, 10:49 AM MDT	Red Flag Warning	RIW	33 hr
Apr 21, 1:23 AM MDT	Fire Weather Watch	RIW	24 hr
Apr 21, 2:45 AM MDT	Winter Weather Advisory	RIW	68 hr
Apr 22, 1:27 AM MDT	Red Flag Warning	RIW	19 hr
Apr 25, 11:14 PM MDT	Winter Weather Advisory	RIW	34 hr
May 3, 1:06 PM MDT	Freeze Watch	RIW	34 hr
May 4, 11:44 AM MDT	Winter Weather Advisory	RIW	42 hr
May 4, 11:05 PM MDT	Freeze Warning	RIW	34 hr
May 13, 1:52 PM MDT	Severe Thunderstorm Watch	SPC	6 hr
May 13, 3:49 PM MDT	Special Weather Statement	RIW	26 min
May 13, 4:13 PM MDT	Special Weather Statement	RIW	32 min
May 13, 4:58 PM MDT	Severe Thunderstorm Warning	RIW	21 min
May 13, 5:16 PM MDT	Severe Thunderstorm Warning	RIW	29 min
May 13, 5:44 PM MDT	Special Weather Statement	RIW	31 min
May 13, 6:58 PM MDT	Special Weather Statement	RIW	32 min
May 13, 7:26 PM MDT	Special Weather Statement	RIW	34 min
May 16, 2:58 AM MDT	Winter Storm Watch	RIW	9 hr
May 16, 11:52 AM MDT	Winter Storm Warning	RIW	54 hr
May 16, 11:52 AM MDT	Winter Weather Advisory	RIW	54 hr
May 18, 5:57 PM MDT	Freeze Warning	RIW	15 hr
May 19, 9:35 AM MDT	Freeze Warning	RIW	22 hr
May 24, 6:40 PM MDT	Special Weather Statement	RIW	35 min
May 24, 7:08 PM MDT	Special Weather Statement	RIW	37 min
May 29, 9:43 PM MDT	Special Weather Statement	RIW	32 min
May 29, 10:10 PM MDT	Special Weather Statement	RIW	35 min
May 29, 10:39 PM MDT	Special Weather Statement	RIW	51 min
Jun 7, 5:03 PM MDT	Special Weather Statement	RIW	27 min
Jun 20, 12:50 PM MDT	Mesoscale Discussion	SPC	115 min
Jun 20, 1:06 PM MDT	Special Weather Statement	RIW	39 min
Jun 20, 1:18 PM MDT	Severe Thunderstorm Warning	RIW	42 min
Jun 20, 1:27 PM MDT	Severe Thunderstorm Watch	SPC	8 hr
Jun 20, 2:00 PM MDT	Special Weather Statement	RIW	60 min
Jun 20, 2:15 PM MDT	Severe Thunderstorm Warning Considerable damage threat	RIW	45 min
Jun 20, 2:59 PM MDT	Severe Thunderstorm Warning	RIW	61 min
Jun 20, 7:04 PM MDT	Severe Thunderstorm Warning	RIW	41 min
Jun 20, 7:43 PM MDT	Severe Thunderstorm Warning	RIW	47 min
Jun 21, 3:00 PM MDT	Special Weather Statement	RIW	45 min
Jun 24, 9:28 PM MDT	Special Weather Statement	RIW	32 min
Jun 24, 9:33 PM MDT	Severe Thunderstorm Warning	RIW	27 min
Jun 24, 9:57 PM MDT	Severe Thunderstorm Warning	RIW	33 min
Jun 24, 10:08 PM MDT	Severe Thunderstorm Warning	RIW	37 min
Jun 24, 10:40 PM MDT	Special Weather Statement	RIW	35 min
Jun 24, 11:02 PM MDT	Areal Flood Advisory	RIW	3 hr
Jun 24, 11:31 PM MDT	Areal Flood Advisory	RIW	3 hr
Jun 25, 11:13 AM MDT	Mesoscale Discussion	SPC	2 hr
Jun 25, 12:45 PM MDT	Severe Thunderstorm Warning	RIW	45 min
Jun 25, 12:53 PM MDT	Special Weather Statement	RIW	22 min
Jun 25, 1:12 PM MDT	Severe Thunderstorm Warning	RIW	48 min
Jun 25, 1:36 PM MDT	Severe Thunderstorm Warning	RIW	39 min
Jun 25, 1:38 PM MDT	Severe Thunderstorm Warning	RIW	52 min
Jun 25, 1:49 PM MDT	Tornado Warning	RIW	41 min
Jun 25, 2:11 PM MDT	Severe Thunderstorm Warning	RIW	49 min
Jun 27, 2:30 PM MDT	Severe Thunderstorm Warning	RIW	30 min
Jun 27, 3:13 PM MDT	Severe Thunderstorm Warning	RIW	47 min
Jun 27, 3:33 PM MDT	Severe Thunderstorm Warning	RIW	27 min
Jun 27, 3:54 PM MDT	Severe Thunderstorm Warning	RIW	36 min
Jun 27, 4:15 PM MDT	Severe Thunderstorm Warning	RIW	30 min
Jun 27, 4:36 PM MDT	Severe Thunderstorm Warning	RIW	24 min
Jul 2, 6:56 PM MDT	Special Weather Statement	RIW	34 min
Jul 2, 7:27 PM MDT	Special Weather Statement	RIW	48 min
Jul 6, 3:10 PM MDT	Special Weather Statement	RIW	35 min
Jul 6, 4:54 PM MDT	Severe Thunderstorm Warning	RIW	30 min
Jul 6, 4:58 PM MDT	Areal Flood Advisory	RIW	3 hr
Jul 6, 5:17 PM MDT	Severe Thunderstorm Warning	RIW	29 min
Jul 7, 3:58 PM MDT	Special Weather Statement	RIW	47 min
Jul 7, 4:37 PM MDT	Special Weather Statement	RIW	23 min
Jul 7, 4:56 PM MDT	Special Weather Statement	RIW	34 min
Jul 7, 5:05 PM MDT	Special Weather Statement	RIW	25 min
Jul 8, 1:59 PM MDT	Mesoscale Discussion	SPC	2 hr
Jul 9, 10:11 AM MDT	Extreme Heat Watch	RIW	16 hr
Jul 9, 2:58 PM MDT	Special Weather Statement	RIW	47 min
Jul 10, 1:59 AM MDT	Extreme Heat Warning	RIW	5 days
Jul 10, 9:30 AM MDT	Fire Weather Watch	RIW	24 hr
Jul 11, 9:15 AM MDT	Red Flag Warning	RIW	37 hr
Jul 16, 1:49 AM MDT	Flood Watch	RIW	21 hr
Jul 17, 1:55 AM MDT	Flood Watch	RIW	20 hr
Jul 18, 2:37 AM MDT	Flood Watch	RIW	19 hr
Jul 21, 1:57 AM MDT	Flood Watch	RIW	66 hr
Jul 21, 5:36 PM MDT	Areal Flood Advisory	RIW	3 hr
Jul 22, 2:33 PM MDT	Areal Flood Advisory	RIW	6 hr
Jul 22, 2:36 PM MDT	Areal Flood Advisory	RIW	4 hr
Jul 22, 2:45 PM MDT	Areal Flood Advisory	RIW	3 hr
Jul 22, 3:19 PM MDT	Areal Flood Advisory	RIW	3 hr
Jul 22, 6:34 PM MDT	Areal Flood Advisory	RIW	3 hr
Jul 22, 6:36 PM MDT	Areal Flood Advisory	RIW	3 hr
Jul 22, 8:26 PM MDT	Areal Flood Advisory	RIW	6 hr
Jul 22, 11:25 PM MDT	Areal Flood Advisory	RIW	3 hr
Jul 23, 4:25 PM MDT	Special Weather Statement	RIW	50 min
Jul 23, 5:02 PM MDT	Special Weather Statement	RIW	28 min
Jul 24, 11:26 AM MDT	Heat Advisory	RIW	58 hr
Jul 31, 12:49 AM MDT	Heat Advisory	RIW	68 hr
Jul 31, 9:54 AM MDT	Fire Weather Watch	RIW	28 hr
Aug 1, 1:28 PM MDT	Red Flag Warning	RIW	56 hr
Aug 6, 1:51 AM MDT	Red Flag Warning	RIW	19 hr
Aug 7, 1:12 AM MDT	Red Flag Warning	RIW	20 hr
Aug 7, 12:27 PM MDT	Red Flag Warning	RIW	57 hr
Aug 10, 2:23 AM MDT	Red Flag Warning	RIW	19 hr
Aug 10, 2:00 PM MDT	Red Flag Warning	RIW	31 hr
Aug 14, 2:36 PM MDT	Special Weather Statement	RIW	24 min
Aug 17, 3:57 PM MDT	Special Weather Statement	RIW	33 min
Aug 22, 7:49 PM MDT	Special Weather Statement	RIW	41 min
Aug 23, 5:42 PM MDT	Special Weather Statement	RIW	33 min
Aug 23, 6:06 PM MDT	Special Weather Statement	RIW	24 min
Aug 23, 6:41 PM MDT	Special Weather Statement	RIW	34 min
Aug 24, 1:03 PM MDT	Mesoscale Discussion	SPC	117 min
Aug 24, 3:58 PM MDT	Special Weather Statement	RIW	32 min
Aug 24, 4:33 PM MDT	Special Weather Statement	RIW	42 min
Aug 25, 3:31 PM MDT	Special Weather Statement	RIW	29 min
Aug 25, 4:18 PM MDT	Special Weather Statement	RIW	27 min
Aug 25, 4:43 PM MDT	Special Weather Statement	RIW	47 min
Aug 26, 4:57 PM MDT	Special Weather Statement	RIW	48 min
Aug 27, 3:01 PM MDT	Special Weather Statement	RIW	44 min
Aug 27, 3:31 PM MDT	Special Weather Statement	RIW	44 min
Aug 27, 3:44 PM MDT	Severe Thunderstorm Warning	RIW	31 min
Aug 27, 4:12 PM MDT	Severe Thunderstorm Warning	RIW	11 min
Aug 28, 10:43 AM MDT	Flood Watch	RIW	41 hr
Sep 2, 2:05 AM MDT	Fire Weather Watch	RIW	7 hr
Sep 2, 9:22 AM MDT	Red Flag Warning	RIW	36 hr
Sep 2, 5:55 PM MDT	Special Weather Statement	RIW	20 min
Sep 2, 6:19 PM MDT	Special Weather Statement	RIW	26 min
Sep 3, 11:12 AM MDT	Red Flag Warning	RIW	34 hr
Sep 8, 12:58 AM MDT	Red Flag Warning	RIW	68 hr
Sep 8, 11:34 AM MDT	Freeze Warning	RIW	21 hr
Sep 13, 1:00 AM MDT	Fire Weather Watch	RIW	9 hr
Sep 13, 10:03 AM MDT	Red Flag Warning	RIW	34 hr
Sep 13, 11:10 AM MDT	High Wind Warning	RIW	27 hr
Sep 17, 10:33 AM MDT	Flood Watch	RIW	3 days
Sep 18, 1:39 PM MDT	Special Weather Statement	RIW	36 min
Sep 18, 1:51 PM MDT	Areal Flood Advisory	RIW	54 min
Sep 18, 1:55 PM MDT	Areal Flood Advisory	RIW	3 hr
Sep 18, 2:14 PM MDT	Special Weather Statement	RIW	46 min
Sep 18, 2:32 PM MDT	Areal Flood Advisory	RIW	118 min
Sep 19, 5:47 PM MDT	Areal Flood Advisory	RIW	3 hr
Sep 19, 6:14 PM MDT	Areal Flood Advisory	RIW	3 hr
Sep 19, 6:25 PM MDT	Flash Flood Warning	RIW	3 hr
Sep 19, 7:39 PM MDT	Areal Flood Advisory	RIW	3 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	25
Tornado Warning	1
Severe Thunderstorm Watch	2
Mesoscale Discussion	6
Special Weather Statement	49
Flooding
Flash Flood Warning	1
Flood Watch	6
Areal Flood Advisory	18
Winter
Winter Storm Warning	4
Winter Storm Watch	6
Winter Weather Advisory	17
Heat
Extreme Heat Warning	1
Extreme Heat Watch	1
Heat Advisory	2
Cold
Freeze Warning	5
Freeze Watch	1
Wind and dust
High Wind Warning	9
High Wind Watch	8
Fire
Red Flag Warning	19
Fire Weather Watch	8

The busiest days

Days with the most alerts issued, by UTC date.

Nearby

Alerts in force now Tornadoes on record Forecast The radar archive 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.