Alert archive / Wyoming / Fremont County

Weather alerts in Fremont County, Wyoming, 2020

184 weather alerts in 2020, 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 2020. Tap one for its archive.

Alerts: 184
Warnings: 65
Watches: 35
Advisories: 33
Busiest month: June32 alerts
Busiest day: June 7, 20208 alerts

Over time

By month

Warning verification

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

Fremont County, 2020

	Warnings	With a report	False alarm ratio	Reports	Inside a warning	Mean lead time
Tornado warnings	0			0
Severe thunderstorm warnings	11	5	55%	11	55%	25 min
Flash flood warnings	0			0

Each office's whole area, 2020

	Warnings	With a report	False alarm ratio	Reports	Inside a warning	Mean lead time
NWS Riverton, WY: severe thunderstorm warnings	45	12	73%	41	39%	22 min
NWS Riverton, WY: flash flood warnings	2	0	100%	0

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 1, 12:26 AM MST	High Wind Warning	RIW	15 hr
Jan 2, 10:45 PM MST	High Wind Watch	RIW	15 hr
Jan 3, 1:41 PM MST	High Wind Warning	RIW	30 hr
Jan 7, 1:46 AM MST	Winter Weather Advisory	RIW	64 hr
Jan 7, 10:51 AM MST	High Wind Warning	RIW	3 hr
Jan 10, 12:40 PM MST	Winter Weather Advisory	RIW	41 hr
Jan 12, 9:58 AM MST	Winter Storm Warning	RIW	19 hr
Jan 13, 5:45 AM MST	Winter Weather Advisory	RIW	35 hr
Jan 16, 4:12 AM MST	Winter Weather Advisory	RIW	37 hr
Jan 31, 1:12 PM MST	Winter Storm Watch	RIW	40 hr
Jan 31, 1:27 PM MST	High Wind Watch	RIW	13 hr
Jan 31, 1:27 PM MST	High Wind Warning	RIW	38 hr
Feb 1, 1:50 PM MST	Winter Storm Warning	RIW	63 hr
Feb 1, 1:50 PM MST	Winter Weather Advisory	RIW	55 hr
Feb 4, 6:26 AM MST	Winter Storm Watch	RIW	33 hr
Feb 5, 3:41 AM MST	Winter Storm Warning	RIW	55 hr
Feb 6, 5:42 PM MST	Special Weather Statement	RIW	48 min
Feb 7, 1:30 PM MST	Winter Weather Advisory	RIW	28 hr
Feb 13, 1:15 PM MST	Winter Weather Advisory	RIW	32 hr
Feb 14, 11:41 AM MST	Winter Storm Watch	RIW	16 hr
Feb 15, 3:43 AM MST	Winter Storm Warning	RIW	43 hr
Feb 15, 3:43 AM MST	Winter Weather Advisory	RIW	43 hr
Feb 28, 1:43 PM MST	Winter Storm Watch	RIW	24 hr
Feb 29, 1:43 PM MST	Winter Weather Advisory	RIW	31 hr
Mar 13, 2:57 AM MDT	Winter Storm Watch	RIW	11 hr
Mar 13, 1:52 PM MDT	Winter Storm Warning	RIW	52 hr
Mar 13, 1:52 PM MDT	Winter Weather Advisory	RIW	52 hr
Mar 24, 2:52 AM MDT	Winter Weather Advisory	RIW	27 hr
Mar 30, 1:45 AM MDT	Winter Storm Warning	RIW	45 hr
Mar 30, 1:45 AM MDT	Winter Weather Advisory	RIW	45 hr
Mar 30, 3:05 PM MDT	High Wind Warning	RIW	28 hr
Apr 1, 2:29 AM MDT	Winter Weather Advisory	RIW	34 hr
Apr 10, 2:39 AM MDT	Winter Storm Watch	RIW	24 hr
Apr 11, 2:31 AM MDT	Winter Storm Warning	RIW	35 hr
Apr 11, 2:31 AM MDT	Winter Weather Advisory	RIW	35 hr
Apr 14, 12:47 PM MDT	Winter Weather Advisory	RIW	47 hr
Apr 15, 2:30 AM MDT	Winter Storm Warning	RIW	34 hr
Apr 30, 2:05 PM MDT	Special Weather Statement	RIW	40 min
Apr 30, 4:06 PM MDT	Special Weather Statement	RIW	54 min
May 5, 2:35 PM MDT	High Wind Watch	RIW	20 hr
May 8, 4:11 PM MDT	Special Weather Statement	RIW	34 min
May 8, 4:45 PM MDT	Special Weather Statement	RIW	30 min
May 12, 4:49 PM MDT	Mesoscale Discussion	SPC	116 min
May 23, 2:26 PM MDT	Special Weather Statement	RIW	64 min
May 23, 3:23 PM MDT	Special Weather Statement	RIW	52 min
May 29, 2:12 PM MDT	Mesoscale Discussion	SPC	2 hr
May 30, 1:45 PM MDT	Mesoscale Discussion	SPC	90 min
May 30, 4:00 PM MDT	Special Weather Statement	RIW	60 min
May 30, 4:31 PM MDT	Special Weather Statement	RIW	44 min
May 30, 4:40 PM MDT	Severe Thunderstorm Warning	RIW	20 min
May 30, 4:57 PM MDT	Severe Thunderstorm Warning	RIW	29 min
May 30, 5:18 PM MDT	Severe Thunderstorm Warning	RIW	28 min
May 31, 12:18 PM MDT	Mesoscale Discussion	SPC	117 min
May 31, 7:01 PM MDT	Areal Flood Advisory	RIW	15 hr
Jun 1, 9:44 AM MDT	Areal Flood Warning	RIW	65 hr
Jun 5, 7:13 PM MDT	Special Weather Statement	RIW	47 min
Jun 6, 12:56 AM MDT	Severe Thunderstorm Warning	RIW	61 min
Jun 6, 10:14 AM MDT	Special Weather Statement	RIW	61 min
Jun 6, 2:32 PM MDT	Severe Thunderstorm Warning	RIW	58 min
Jun 6, 2:58 PM MDT	Special Weather Statement	RIW	32 min
Jun 6, 3:14 PM MDT	Severe Thunderstorm Warning	RIW	61 min
Jun 6, 3:34 PM MDT	Severe Thunderstorm Warning	RIW	56 min
Jun 6, 6:10 PM MDT	Special Weather Statement	RIW	35 min
Jun 7, 2:22 AM MDT	Winter Weather Advisory	RIW	30 hr
Jun 7, 2:30 AM MDT	Freeze Watch	RIW	9 hr
Jun 7, 11:15 AM MDT	Freeze Warning	RIW	22 hr
Jun 7, 2:11 PM MDT	Special Weather Statement	RIW	49 min
Jun 7, 2:34 PM MDT	Mesoscale Discussion	SPC	116 min
Jun 7, 2:42 PM MDT	Severe Thunderstorm Warning	RIW	33 min
Jun 7, 3:35 PM MDT	Special Weather Statement	RIW	55 min
Jun 8, 11:38 AM MDT	Freeze Warning	RIW	21 hr
Jun 13, 10:07 AM MDT	High Wind Warning	RIW	8 hr
Jun 15, 3:55 PM MDT	Fire Weather Watch	RIW	12 hr
Jun 16, 4:05 AM MDT	Red Flag Warning	RIW	15 hr
Jun 16, 4:11 AM MDT	Winter Weather Advisory	RIW	29 hr
Jun 16, 3:34 PM MDT	Special Weather Statement	RIW	26 min
Jun 21, 12:52 PM MDT	Special Weather Statement	RIW	53 min
Jun 21, 2:08 PM MDT	Special Weather Statement	RIW	37 min
Jun 21, 5:00 PM MDT	Special Weather Statement	RIW	45 min
Jun 28, 10:35 AM MDT	Special Weather Statement	RIW	25 min
Jun 28, 4:05 PM MDT	Severe Thunderstorm Warning	RIW	40 min
Jun 28, 4:38 PM MDT	Severe Thunderstorm Warning	RIW	37 min
Jun 29, 1:31 PM MDT	Areal Flood Advisory	RIW	30 hr
Jun 29, 5:39 PM MDT	Areal Flood Warning	RIW	26 hr
Jun 30, 2:37 AM MDT	Areal Flood Warning	RIW	31 hr
Jul 1, 2:37 AM MDT	Red Flag Warning	RIW	41 hr
Jul 5, 8:49 AM MDT	Fire Weather Watch	RIW	28 hr
Jul 5, 1:28 PM MDT	Red Flag Warning	RIW	3 days
Jul 9, 1:14 AM MDT	Fire Weather Watch	RIW	18 hr
Jul 9, 7:30 PM MDT	Red Flag Warning	RIW	25 hr
Jul 11, 2:44 AM MDT	Fire Weather Watch	RIW	12 hr
Jul 11, 2:27 PM MDT	Red Flag Warning	RIW	30 hr
Jul 16, 2:32 AM MDT	Fire Weather Watch	RIW	16 hr
Jul 16, 2:42 PM MDT	Red Flag Warning	RIW	53 hr
Jul 17, 5:43 PM MDT	Special Weather Statement	RIW	32 min
Jul 17, 6:13 PM MDT	Special Weather Statement	RIW	47 min
Jul 18, 2:58 AM MDT	Red Flag Warning	RIW	17 hr
Jul 23, 5:49 PM MDT	Special Weather Statement	RIW	41 min
Jul 23, 6:19 PM MDT	Special Weather Statement	RIW	41 min
Jul 23, 6:33 PM MDT	Special Weather Statement	RIW	27 min
Jul 23, 6:38 PM MDT	Severe Thunderstorm Warning	RIW	37 min
Jul 27, 2:02 PM MDT	Special Weather Statement	RIW	28 min
Jul 28, 1:35 PM MDT	Special Weather Statement	RIW	40 min
Jul 28, 2:52 PM MDT	Special Weather Statement	RIW	23 min
Jul 31, 5:11 PM MDT	Special Weather Statement	RIW	34 min
Jul 31, 5:43 PM MDT	Special Weather Statement	RIW	32 min
Aug 5, 2:30 AM MDT	Fire Weather Watch	RIW	12 hr
Aug 5, 2:04 PM MDT	Red Flag Warning	RIW	30 hr
Aug 10, 12:12 PM MDT	Red Flag Warning	RIW	32 hr
Aug 11, 12:12 PM MDT	Red Flag Warning	RIW	3 days
Aug 11, 2:30 PM MDT	Special Weather Statement	RIW	45 min
Aug 12, 4:21 PM MDT	Special Weather Statement	RIW	24 min
Aug 12, 5:07 PM MDT	Special Weather Statement	RIW	23 min
Aug 12, 5:29 PM MDT	Special Weather Statement	RIW	31 min
Aug 18, 3:43 AM MDT	Red Flag Warning	RIW	17 hr
Aug 18, 3:53 PM MDT	Special Weather Statement	RIW	37 min
Aug 18, 4:11 PM MDT	Special Weather Statement	RIW	34 min
Aug 20, 3:31 AM MDT	Fire Weather Watch	RIW	22 hr
Aug 23, 3:56 PM MDT	Special Weather Statement	RIW	34 min
Aug 25, 1:56 PM MDT	Fire Weather Watch	RIW	23 hr
Aug 25, 7:03 PM MDT	Special Weather Statement	RIW	42 min
Aug 26, 12:57 PM MDT	Red Flag Warning	RIW	31 hr
Aug 26, 4:15 PM MDT	Special Weather Statement	RIW	45 min
Aug 26, 4:58 PM MDT	Special Weather Statement	RIW	47 min
Aug 27, 1:27 PM MDT	Mesoscale Discussion	SPC	3 hr
Aug 28, 1:59 AM MDT	Fire Weather Watch	RIW	13 hr
Aug 28, 3:11 PM MDT	Red Flag Warning	RIW	54 hr
Aug 31, 4:10 AM MDT	Freeze Watch	RIW	99 min
Aug 31, 5:49 AM MDT	Freeze Warning	RIW	27 hr
Aug 31, 2:47 PM MDT	Fire Weather Watch	RIW	13 hr
Sep 1, 3:36 AM MDT	Red Flag Warning	RIW	40 hr
Sep 1, 2:35 PM MDT	Freeze Warning	RIW	12 hr
Sep 3, 2:37 PM MDT	Fire Weather Watch	RIW	44 hr
Sep 4, 12:31 PM MDT	Red Flag Warning	RIW	3 days
Sep 6, 12:33 PM MDT	Winter Storm Watch	RIW	16 hr
Sep 7, 4:34 AM MDT	Winter Storm Warning	RIW	37 hr
Sep 7, 4:34 AM MDT	Winter Weather Advisory	RIW	37 hr
Sep 12, 1:44 PM MDT	Fire Weather Watch	RIW	24 hr
Sep 13, 1:18 PM MDT	Red Flag Warning	RIW	32 hr
Sep 16, 1:46 PM MDT	Fire Weather Watch	RIW	22 hr
Sep 22, 5:30 PM MDT	Special Weather Statement	RIW	30 min
Sep 22, 5:53 PM MDT	Special Weather Statement	RIW	37 min
Sep 22, 6:30 PM MDT	Special Weather Statement	RIW	30 min
Sep 23, 2:43 AM MDT	Fire Weather Watch	RIW	12 hr
Sep 23, 2:21 PM MDT	Red Flag Warning	RIW	53 hr
Oct 6, 1:55 AM MDT	Fire Weather Watch	RIW	36 hr
Oct 7, 2:05 PM MDT	Red Flag Warning	RIW	30 hr
Oct 9, 3:12 AM MDT	Fire Weather Watch	RIW	10 hr
Oct 9, 1:40 PM MDT	Red Flag Warning	RIW	30 hr
Oct 10, 2:12 PM MDT	Winter Weather Advisory	RIW	22 hr
Oct 11, 12:00 PM MDT	High Wind Warning	RIW	7 hr
Oct 13, 3:54 AM MDT	High Wind Watch	RIW	9 hr
Oct 13, 1:20 PM MDT	High Wind Warning	RIW	30 hr
Oct 14, 9:08 AM MDT	High Wind Warning	RIW	10 hr
Oct 16, 2:02 PM MDT	Winter Weather Advisory	RIW	64 hr
Oct 16, 3:47 PM MDT	High Wind Warning	RIW	11 hr
Oct 20, 3:23 PM MDT	Winter Storm Watch	RIW	13 hr
Oct 21, 4:22 AM MDT	Winter Weather Advisory	RIW	38 hr
Oct 22, 7:17 PM MDT	Winter Storm Watch	RIW	9 hr
Oct 23, 4:23 AM MDT	Winter Storm Warning	RIW	50 hr
Oct 23, 4:23 AM MDT	Winter Weather Advisory	RIW	58 hr
Nov 7, 3:32 AM MST	Winter Weather Advisory	RIW	37 hr
Nov 7, 8:47 PM MST	Special Weather Statement	RIW	28 min
Nov 9, 2:15 PM MST	Winter Weather Advisory	RIW	56 hr
Nov 11, 1:06 AM MST	Winter Storm Warning	RIW	21 hr
Nov 12, 2:39 AM MST	High Wind Watch	RIW	34 hr
Nov 12, 4:38 AM MST	Winter Storm Watch	RIW	10 hr
Nov 12, 1:22 PM MST	High Wind Warning	RIW	53 hr
Nov 12, 2:41 PM MST	Winter Storm Warning	RIW	48 hr
Nov 12, 2:41 PM MST	Winter Weather Advisory	RIW	48 hr
Nov 14, 2:42 PM MST	Winter Weather Advisory	RIW	39 hr
Nov 14, 8:49 PM MST	High Wind Warning	RIW	21 hr
Nov 18, 1:25 AM MST	High Wind Warning	RIW	17 hr
Nov 18, 9:01 AM MST	Special Weather Statement	RIW	14 min
Dec 16, 2:21 PM MST	Winter Weather Advisory	RIW	36 hr
Dec 18, 1:30 PM MST	High Wind Watch	RIW	36 hr
Dec 19, 4:58 AM MST	High Wind Warning	RIW	44 hr
Dec 19, 1:10 PM MST	Winter Weather Advisory	RIW	47 hr
Dec 21, 3:01 AM MST	High Wind Watch	RIW	23 hr
Dec 21, 2:06 PM MST	High Wind Warning	RIW	39 hr
Dec 25, 12:42 PM MST	Winter Storm Warning	RIW	41 hr
Dec 25, 12:42 PM MST	Winter Weather Advisory	RIW	41 hr
Dec 28, 5:51 AM MST	Freezing Fog Advisory	RIW	6 hr
Dec 28, 11:29 PM MST	Freezing Fog Advisory	RIW	12 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	45
Flooding
Areal Flood Warning	3
Areal Flood Advisory	2
Winter
Winter Storm Warning	13
Winter Storm Watch	10
Winter Weather Advisory	29
Cold
Freeze Warning	4
Freeze Watch	2
Wind and dust
High Wind Warning	15
High Wind Watch	7
Fire
Red Flag Warning	19
Fire Weather Watch	16
Fog and smoke
Freezing Fog Advisory	2

The busiest days

Days with the most alerts issued, by UTC date.

Nearby

Alerts in force now Tornadoes on record Forecast The radar archive 2019 2021

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.