Alert archive / Maryland / Frederick County

Weather alerts in Frederick County, Maryland, 2026

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

Frederick County and its neighbors

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

Alerts: 177
Warnings: 75
Watches: 36
Advisories: 22
Busiest month: July50 alerts
Busiest day: July 18, 202614 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 5 tornado warnings covering Frederick County in 2026 had a tornado report inside them.

Frederick County, 2026

	Warnings	With a report	False alarm ratio	Reports	Inside a warning	Mean lead time
Tornado warnings	5	1	80%	0
Severe thunderstorm warnings	53	50	6%	98	91%	20 min
Flash flood warnings	3	2	33%	2	50%	6 min

Each office's whole area, 2026

	Warnings	With a report	False alarm ratio	Reports	Inside a warning	Mean lead time
NWS Baltimore/Washington: tornado warnings	47	6	87%	14	64%	13 min
NWS Baltimore/Washington: severe thunderstorm warnings	526	366	30%	1,477	87%	20 min
NWS Baltimore/Washington: flash flood warnings	46	27	41%	78	87%	57 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, Eastern Time. Each opens its own page with the text, the map, the radar and the sounding.

Issued	Product	Office	Lasted
Jan 1, 3:00 AM EST	Mesoscale Discussion	SPC	4 hr
Jan 1, 3:30 AM EST	Snow Squall Warning Significant damage threat	LWX	60 min
Jan 1, 4:17 AM EST	Snow Squall Warning Significant damage threat	LWX	43 min
Jan 1, 4:29 AM EST	Snow Squall Warning Significant damage threat	LWX	38 min
Jan 22, 2:16 AM EST	Winter Storm Watch	LWX	32 hr
Jan 22, 12:49 PM EST	Cold Weather Advisory	LWX	47 hr
Jan 23, 10:03 AM EST	Winter Storm Warning	LWX	67 hr
Jan 25, 6:01 AM EST	Mesoscale Discussion	SPC	6 hr
Jan 25, 9:39 AM EST	Mesoscale Discussion	SPC	3 hr
Jan 25, 3:02 PM EST	Mesoscale Discussion	SPC	4 hr
Jan 25, 11:13 PM EST	Cold Weather Advisory	LWX	4 days
Jan 27, 12:01 AM EST	Cold Weather Advisory	LWX	35 hr
Jan 27, 11:39 PM EST	Cold Weather Advisory	LWX	59 hr
Jan 28, 11:08 PM EST	Cold Weather Advisory	LWX	36 hr
Jan 30, 12:35 AM EST	Cold Weather Advisory	LWX	33 hr
Jan 31, 1:12 AM EST	Cold Weather Advisory	LWX	34 hr
Feb 5, 1:07 PM EST	Extreme Cold Watch	LWX	13 hr
Feb 5, 1:07 PM EST	Extreme Cold Warning	LWX	69 hr
Feb 6, 1:55 AM EST	Cold Weather Advisory	LWX	56 hr
Feb 6, 1:55 AM EST	High Wind Warning	LWX	44 hr
Feb 7, 12:53 AM EST	Special Weather Statement	LWX	37 min
Feb 7, 1:30 AM EST	Special Weather Statement	LWX	60 min
Feb 7, 2:14 AM EST	Special Weather Statement	LWX	46 min
Feb 7, 6:25 PM EST	Wind Advisory	LWX	4 hr
Feb 8, 12:55 PM EST	Cold Weather Advisory	LWX	21 hr
Feb 17, 4:52 AM EST	Dense Fog Advisory	LWX	6 hr
Feb 20, 12:04 PM EST	Winter Storm Watch	LWX	27 hr
Feb 21, 2:46 PM EST	Winter Storm Warning	LWX	57 hr
Feb 27, 5:07 AM EST	Freezing Fog Advisory	LWX	5 hr
Mar 2, 2:26 AM EST	Winter Weather Advisory	LWX	35 hr
Mar 3, 12:36 AM EST	Mesoscale Discussion	SPC	6 hr
Mar 3, 5:58 AM EST	Mesoscale Discussion	SPC	5 hr
Mar 4, 8:50 PM EST	Dense Fog Advisory	LWX	13 hr
Mar 6, 3:28 AM EST	Dense Fog Advisory	LWX	7 hr
Mar 11, 1:45 PM EDT	Tornado Watch	SPC	6 hr
Mar 11, 4:34 PM EDT	Mesoscale Discussion	SPC	86 min
Mar 11, 6:09 PM EDT	Severe Thunderstorm Warning	LWX	51 min
Mar 11, 6:40 PM EDT	Severe Thunderstorm Warning	LWX	35 min
Mar 11, 6:40 PM EDT	Severe Thunderstorm Warning Considerable damage threat	LWX	35 min
Mar 11, 6:44 PM EDT	Tornado Warning	LWX	20 min
Mar 11, 6:47 PM EDT	Mesoscale Discussion	SPC	118 min
Mar 11, 6:56 PM EDT	Severe Thunderstorm Warning	LWX	34 min
Mar 12, 2:40 AM EDT	Wind Advisory	LWX	44 hr
Mar 15, 12:43 PM EDT	Wind Advisory	LWX	43 hr
Mar 16, 10:03 AM EDT	Mesoscale Discussion	SPC	2 hr
Mar 16, 10:52 AM EDT	Tornado Watch	SPC	8 hr
Mar 16, 10:57 AM EDT	Severe Thunderstorm Warning Considerable damage threat	LWX	48 min
Mar 16, 11:28 AM EDT	Severe Thunderstorm Warning Considerable damage threat	LWX	17 min
Mar 16, 11:40 AM EDT	Severe Thunderstorm Warning	LWX	50 min
Mar 16, 11:46 AM EDT	Tornado Warning	LWX	14 min
Mar 16, 12:00 PM EDT	Tornado Warning	LWX	15 min
Mar 16, 8:33 PM EDT	Severe Thunderstorm Warning	LWX	42 min
Mar 20, 10:47 PM EDT	Special Weather Statement	LWX	28 min
Apr 1, 3:50 PM EDT	Mesoscale Discussion	SPC	115 min
Apr 6, 1:49 PM EDT	Freeze Watch	LWX	12 hr
Apr 7, 2:13 AM EDT	Freeze Watch	LWX	35 hr
Apr 7, 2:13 AM EDT	Freeze Warning	LWX	31 hr
Apr 8, 12:57 PM EDT	Freeze Warning	LWX	20 hr
Apr 18, 11:59 PM EDT	Freeze Watch	LWX	24 hr
Apr 19, 11:35 PM EDT	Freeze Warning	LWX	33 hr
May 2, 12:07 PM EDT	Frost Advisory	LWX	21 hr
May 10, 3:10 PM EDT	Mesoscale Discussion	SPC	3 hr
May 13, 7:11 PM EDT	Severe Thunderstorm Warning	LWX	34 min
May 19, 5:40 PM EDT	Mesoscale Discussion	SPC	65 min
May 20, 12:23 PM EDT	Mesoscale Discussion	SPC	97 min
May 20, 12:39 PM EDT	Severe Thunderstorm Watch	SPC	7 hr
May 20, 2:46 PM EDT	Severe Thunderstorm Warning	LWX	44 min
May 20, 3:09 PM EDT	Mesoscale Discussion	SPC	96 min
May 20, 3:41 PM EDT	Severe Thunderstorm Warning	LWX	34 min
Jun 6, 1:42 PM EDT	Severe Thunderstorm Watch	SPC	6 hr
Jun 6, 3:57 PM EDT	Mesoscale Discussion	SPC	2 hr
Jun 6, 4:29 PM EDT	Severe Thunderstorm Warning	LWX	46 min
Jun 6, 5:11 PM EDT	Severe Thunderstorm Warning Considerable damage threat	LWX	64 min
Jun 6, 5:17 PM EDT	Severe Thunderstorm Warning	LWX	58 min
Jun 6, 5:51 PM EDT	Severe Thunderstorm Warning Considerable damage threat	LWX	54 min
Jun 6, 5:57 PM EDT	Severe Thunderstorm Warning	LWX	48 min
Jun 11, 2:58 PM EDT	Heat Advisory	LWX	26 hr
Jun 11, 3:02 PM EDT	Mesoscale Discussion	SPC	118 min
Jun 11, 4:12 PM EDT	Severe Thunderstorm Watch	SPC	6 hr
Jun 11, 6:45 PM EDT	Severe Thunderstorm Warning	LWX	45 min
Jun 11, 7:18 PM EDT	Severe Thunderstorm Warning	LWX	42 min
Jun 11, 7:54 PM EDT	Severe Thunderstorm Warning	LWX	36 min
Jun 14, 3:17 PM EDT	Mesoscale Discussion	SPC	118 min
Jun 14, 4:18 PM EDT	Severe Thunderstorm Watch	SPC	6 hr
Jun 14, 6:22 PM EDT	Mesoscale Discussion	SPC	113 min
Jun 14, 8:21 PM EDT	Severe Thunderstorm Warning	LWX	39 min
Jun 14, 9:25 PM EDT	Mesoscale Discussion	SPC	2 hr
Jun 22, 1:25 PM EDT	Mesoscale Discussion	SPC	2 hr
Jun 22, 2:08 PM EDT	Severe Thunderstorm Watch	SPC	8 hr
Jun 30, 3:03 AM EDT	Heat Advisory	LWX	41 hr
Jun 30, 3:03 AM EDT	Extreme Heat Watch	LWX	34 hr
Jul 1, 1:32 PM EDT	Extreme Heat Warning	LWX	30 hr
Jul 1, 1:32 PM EDT	Extreme Heat Warning	LWX	55 hr
Jul 2, 8:36 AM EDT	Extreme Heat Watch	LWX	5 hr
Jul 2, 1:32 PM EDT	Extreme Heat Warning	LWX	54 hr
Jul 3, 3:25 PM EDT	Severe Thunderstorm Watch	SPC	7 hr
Jul 4, 12:49 PM EDT	Mesoscale Discussion	SPC	2 hr
Jul 4, 2:16 PM EDT	Severe Thunderstorm Watch	SPC	9 hr
Jul 4, 5:18 PM EDT	Severe Thunderstorm Warning	LWX	27 min
Jul 4, 5:45 PM EDT	Severe Thunderstorm Warning	LWX	60 min
Jul 4, 6:04 PM EDT	Severe Thunderstorm Warning	LWX	41 min
Jul 4, 6:15 PM EDT	Severe Thunderstorm Warning Destructive damage threat	LWX	30 min
Jul 4, 6:45 PM EDT	Severe Thunderstorm Warning	LWX	30 min
Jul 4, 6:47 PM EDT	Mesoscale Discussion	SPC	118 min
Jul 5, 2:08 PM EDT	Flood Watch	LWX	11 hr
Jul 5, 6:00 PM EDT	Mesoscale Discussion	SPC	2 hr
Jul 5, 6:44 PM EDT	Severe Thunderstorm Watch	SPC	6 hr
Jul 6, 4:09 AM EDT	Flood Watch	LWX	22 hr
Jul 6, 5:58 PM EDT	Mesoscale Discussion	SPC	2 hr
Jul 9, 4:10 AM EDT	Flood Watch	LWX	16 hr
Jul 9, 1:51 PM EDT	Severe Thunderstorm Warning	LWX	39 min
Jul 9, 2:04 PM EDT	Flash Flood Warning	LWX	82 min
Jul 9, 2:13 PM EDT	Severe Thunderstorm Warning	LWX	32 min
Jul 9, 2:30 PM EDT	Severe Thunderstorm Watch	SPC	7 hr
Jul 9, 3:26 PM EDT	Areal Flood Warning	LWX	94 min
Jul 14, 12:04 PM EDT	Heat Advisory	LWX	32 hr
Jul 16, 9:55 AM EDT	Heat Advisory	LWX	10 hr
Jul 18, 9:23 AM EDT	Flood Watch	LWX	14 hr
Jul 18, 12:50 PM EDT	Mesoscale Discussion	SPC	85 min
Jul 18, 1:55 PM EDT	Severe Thunderstorm Warning	LWX	50 min
Jul 18, 1:55 PM EDT	Tornado Watch	SPC	6 hr
Jul 18, 2:12 PM EDT	Severe Thunderstorm Warning	LWX	33 min
Jul 18, 2:14 PM EDT	Severe Thunderstorm Watch	SPC	7 hr
Jul 18, 2:16 PM EDT	Tornado Warning	LWX	17 min
Jul 18, 2:26 PM EDT	Severe Thunderstorm Warning Considerable damage threat	LWX	49 min
Jul 18, 2:33 PM EDT	Tornado Warning	LWX	17 min
Jul 18, 2:34 PM EDT	Severe Thunderstorm Warning	LWX	41 min
Jul 18, 2:41 PM EDT	Severe Thunderstorm Warning	LWX	28 min
Jul 18, 3:00 PM EDT	Severe Thunderstorm Warning Considerable damage threat	LWX	49 min
Jul 18, 3:14 PM EDT	Flash Flood Warning	LWX	92 min
Jul 18, 4:39 PM EDT	Mesoscale Discussion	SPC	96 min
Jul 21, 2:20 PM EDT	Flood Watch	LWX	7 hr
Jul 21, 2:46 PM EDT	Severe Thunderstorm Watch	SPC	11 hr
Jul 28, 12:08 PM EDT	Mesoscale Discussion	SPC	2 hr
Jul 28, 2:48 PM EDT	Severe Thunderstorm Watch	SPC	9 hr
Jul 28, 3:32 PM EDT	Severe Thunderstorm Warning	LWX	58 min
Jul 28, 3:59 PM EDT	Severe Thunderstorm Warning	LWX	46 min
Jul 28, 4:16 PM EDT	Severe Thunderstorm Warning Considerable damage threat	LWX	44 min
Jul 28, 4:21 PM EDT	Severe Thunderstorm Warning	LWX	43 min
Jul 28, 4:36 PM EDT	Severe Thunderstorm Warning	LWX	54 min
Jul 28, 4:53 PM EDT	Mesoscale Discussion	SPC	2 hr
Aug 6, 1:39 PM EDT	Mesoscale Discussion	SPC	2 hr
Aug 7, 12:50 PM EDT	Mesoscale Discussion	SPC	2 hr
Aug 7, 1:22 PM EDT	Severe Thunderstorm Watch	SPC	7 hr
Aug 7, 3:29 PM EDT	Severe Thunderstorm Warning	LWX	46 min
Aug 8, 11:55 AM EDT	Mesoscale Discussion	SPC	95 min
Aug 10, 12:59 PM EDT	Mesoscale Discussion	SPC	2 hr
Aug 10, 1:13 PM EDT	Severe Thunderstorm Watch	SPC	7 hr
Aug 10, 2:29 PM EDT	Severe Thunderstorm Warning	LWX	31 min
Aug 10, 2:46 PM EDT	Severe Thunderstorm Warning	LWX	44 min
Aug 10, 2:50 PM EDT	Severe Thunderstorm Warning	LWX	25 min
Aug 10, 3:10 PM EDT	Severe Thunderstorm Warning	LWX	65 min
Aug 10, 3:12 PM EDT	Flash Flood Warning	LWX	3 hr
Aug 10, 3:15 PM EDT	Severe Thunderstorm Warning	LWX	60 min
Aug 10, 3:21 PM EDT	Severe Thunderstorm Warning	LWX	39 min
Aug 10, 3:39 PM EDT	Mesoscale Discussion	SPC	2 hr
Aug 10, 3:55 PM EDT	Severe Thunderstorm Warning Considerable damage threat	LWX	50 min
Aug 16, 4:36 PM EDT	Severe Thunderstorm Watch	SPC	6 hr
Aug 16, 7:00 PM EDT	Mesoscale Discussion	SPC	60 min
Aug 20, 2:31 PM EDT	Severe Thunderstorm Watch	SPC	7 hr
Aug 20, 2:46 PM EDT	Severe Thunderstorm Warning	LWX	29 min
Aug 27, 1:52 PM EDT	Mesoscale Discussion	SPC	113 min
Aug 27, 3:17 PM EDT	Severe Thunderstorm Watch	SPC	7 hr
Aug 27, 5:40 PM EDT	Severe Thunderstorm Warning	LWX	50 min
Aug 27, 6:20 PM EDT	Severe Thunderstorm Warning	LWX	40 min
Aug 27, 6:56 PM EDT	Severe Thunderstorm Warning	LWX	49 min
Aug 27, 7:26 PM EDT	Mesoscale Discussion	SPC	94 min
Sep 2, 11:09 AM EDT	Mesoscale Discussion	SPC	66 min
Sep 2, 11:46 AM EDT	Severe Thunderstorm Watch	SPC	5 hr
Sep 2, 12:00 PM EDT	Severe Thunderstorm Warning	LWX	45 min
Sep 2, 12:46 PM EDT	Severe Thunderstorm Warning	LWX	44 min
Sep 3, 6:19 PM EDT	Mesoscale Discussion	SPC	116 min
Sep 3, 8:19 PM EDT	Mesoscale Discussion	SPC	56 min
Sep 3, 8:38 PM EDT	Severe Thunderstorm Watch	SPC	5 hr
Sep 3, 10:08 PM EDT	Severe Thunderstorm Warning	LWX	52 min
Sep 3, 11:13 PM EDT	Mesoscale Discussion	SPC	92 min
Sep 4, 2:04 PM EDT	Severe Thunderstorm Watch	SPC	7 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	53
Tornado Warning	5
Severe Thunderstorm Watch	20
Tornado Watch	3
Mesoscale Discussion	40
Special Weather Statement	4
Flooding
Areal Flood Warning	1
Flash Flood Warning	3
Flood Watch	5
Winter
Snow Squall Warning	3
Winter Storm Warning	2
Winter Storm Watch	2
Winter Weather Advisory	1
Heat
Extreme Heat Warning	3
Extreme Heat Watch	2
Heat Advisory	4
Cold
Extreme Cold Warning	1
Freeze Warning	3
Extreme Cold Watch	1
Freeze Watch	3
Cold Weather Advisory	9
Frost Advisory	1
Wind and dust
High Wind Warning	1
Wind Advisory	3
Fog and smoke
Dense Fog Advisory	3
Freezing Fog Advisory	1

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.