Alert archive / Maryland / Calvert County

Weather alerts in Calvert County, Maryland, 2025

150 weather alerts in 2025, from the National Weather Service and the Storm Prediction Center. An alert counts here when it covered this county.

Calvert County and its neighbors

Each county as a circle sized by its count in 2025. Tap one for its archive.

Alerts: 150
Warnings: 39
Watches: 28
Advisories: 43
Busiest month: July40 alerts
Busiest day: July 1, 20258 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 3 tornado warnings covering Calvert County in 2025 had a tornado report inside them.

Calvert County, 2025

	Warnings	With a report	False alarm ratio	Reports	Inside a warning	Mean lead time
Tornado warnings	3	1	67%	0
Severe thunderstorm warnings	25	19	24%	19	95%	12 min
Flash flood warnings	0			0

Each office's whole area, 2025

	Warnings	With a report	False alarm ratio	Reports	Inside a warning	Mean lead time
NWS Baltimore/Washington: tornado warnings	35	4	89%	7	71%	4 min
NWS Baltimore/Washington: severe thunderstorm warnings	379	272	28%	989	84%	19 min
NWS Baltimore/Washington: flash flood warnings	143	91	36%	251	93%	66 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, Eastern Time. Each opens its own page with the text, the map, the radar and the sounding.

Issued	Product	Office	Lasted
Jan 3, 3:47 PM EST	Snow Squall Warning Significant damage threat	LWX	32 min
Jan 4, 3:28 AM EST	Winter Storm Watch	LWX	24 hr
Jan 4, 3:54 PM EST	Winter Storm Warning	LWX	62 hr
Jan 6, 2:12 AM EST	Mesoscale Discussion	SPC	5 hr
Jan 9, 1:18 PM EST	Winter Weather Advisory	LWX	54 hr
Jan 20, 1:42 PM EST	Cold Weather Advisory	LWX	45 hr
Feb 4, 2:49 PM EST	Winter Weather Advisory	LWX	45 hr
Feb 9, 3:09 PM EST	Winter Storm Watch	LWX	24 hr
Feb 10, 2:48 AM EST	Winter Storm Warning	LWX	52 hr
Feb 11, 2:49 PM EST	Mesoscale Discussion	SPC	4 hr
Feb 15, 2:05 AM EST	High Wind Watch	LWX	19 hr
Feb 15, 3:07 PM EST	Wind Advisory	LWX	46 hr
Feb 15, 8:41 PM EST	High Wind Warning	LWX	31 hr
Feb 16, 12:55 PM EST	Mesoscale Discussion	SPC	3 hr
Feb 18, 3:40 AM EST	Winter Weather Advisory	LWX	43 hr
Feb 19, 12:39 PM EST	Winter Weather Advisory	LWX	47 hr
Mar 1, 3:05 AM EST	Red Flag Warning	LWX	16 hr
Mar 4, 2:34 AM EST	Wind Advisory	LWX	36 hr
Mar 5, 10:27 AM EST	Severe Thunderstorm Watch	SPC	8 hr
Mar 5, 1:06 PM EST	Severe Thunderstorm Warning	LWX	24 min
Mar 5, 1:12 PM EST	Wind Advisory	LWX	36 hr
Mar 6, 9:31 AM EST	Wind Advisory	LWX	14 hr
Mar 31, 2:45 PM EDT	Mesoscale Discussion	SPC	2 hr
Mar 31, 6:31 PM EDT	Mesoscale Discussion	SPC	119 min
Mar 31, 8:38 PM EDT	Severe Thunderstorm Warning	LWX	37 min
Apr 7, 3:26 PM EDT	Freeze Watch	LWX	12 hr
Apr 8, 3:38 AM EDT	Freeze Warning	LWX	29 hr
Apr 14, 3:46 AM EDT	Wind Advisory	LWX	47 hr
Apr 15, 11:35 AM EDT	Wind Advisory	LWX	8 hr
Apr 26, 2:05 PM EDT	Mesoscale Discussion	SPC	115 min
May 5, 5:29 PM EDT	Mesoscale Discussion	SPC	2 hr
May 5, 6:01 PM EDT	Severe Thunderstorm Watch	SPC	5 hr
May 13, 8:25 PM EDT	Coastal Flood Advisory	LWX	18 hr
May 16, 9:46 AM EDT	Mesoscale Discussion	SPC	119 min
May 16, 2:32 PM EDT	Severe Thunderstorm Watch	SPC	5 hr
May 16, 4:14 PM EDT	Mesoscale Discussion	SPC	2 hr
May 16, 5:40 PM EDT	Severe Thunderstorm Warning Considerable damage threat	LWX	50 min
May 16, 5:43 PM EDT	Severe Thunderstorm Warning	LWX	47 min
May 16, 6:13 PM EDT	Mesoscale Discussion	SPC	92 min
May 21, 12:33 AM EDT	Coastal Flood Advisory	LWX	30 hr
May 22, 7:59 AM EDT	Coastal Flood Advisory	LWX	10 hr
May 22, 1:27 PM EDT	Mesoscale Discussion	SPC	2 hr
May 22, 4:06 PM EDT	Severe Thunderstorm Warning	LWX	22 min
May 22, 7:28 PM EDT	Coastal Flood Advisory	LWX	10 hr
May 29, 8:31 PM EDT	Flood Watch	LWX	27 hr
May 30, 3:49 PM EDT	Mesoscale Discussion	SPC	116 min
May 30, 5:01 PM EDT	Tornado Watch	SPC	7 hr
May 30, 7:44 PM EDT	Tornado Warning	LWX	31 min
May 30, 8:32 PM EDT	Tornado Warning	LWX	28 min
May 30, 8:37 PM EDT	Mesoscale Discussion	SPC	113 min
May 30, 8:40 PM EDT	Wind Advisory	LWX	9 hr
May 31, 11:52 AM EDT	Mesoscale Discussion	SPC	2 hr
May 31, 1:23 PM EDT	Severe Thunderstorm Warning	LWX	22 min
Jun 8, 1:04 PM EDT	Mesoscale Discussion	SPC	86 min
Jun 8, 2:26 PM EDT	Tornado Watch	SPC	8 hr
Jun 8, 4:31 PM EDT	Mesoscale Discussion	SPC	89 min
Jun 8, 7:17 PM EDT	Mesoscale Discussion	SPC	88 min
Jun 13, 4:43 PM EDT	Mesoscale Discussion	SPC	3 hr
Jun 14, 2:12 AM EDT	Flood Watch	LWX	21 hr
Jun 14, 8:12 PM EDT	Mesoscale Discussion	SPC	93 min
Jun 18, 12:43 PM EDT	Severe Thunderstorm Watch	SPC	6 hr
Jun 19, 1:22 PM EDT	Mesoscale Discussion	SPC	113 min
Jun 19, 1:46 PM EDT	Severe Thunderstorm Watch	SPC	9 hr
Jun 19, 3:22 PM EDT	Mesoscale Discussion	SPC	113 min
Jun 19, 4:27 PM EDT	Severe Thunderstorm Warning	LWX	63 min
Jun 19, 4:43 PM EDT	Severe Thunderstorm Warning	LWX	47 min
Jun 19, 5:25 PM EDT	Mesoscale Discussion	SPC	2 hr
Jun 22, 2:21 PM EDT	Extreme Heat Watch	LWX	19 hr
Jun 22, 2:21 PM EDT	Extreme Heat Warning	LWX	31 hr
Jun 23, 9:37 AM EDT	Extreme Heat Warning	LWX	35 hr
Jun 23, 8:53 PM EDT	Extreme Heat Watch	LWX	17 hr
Jun 24, 2:06 PM EDT	Heat Advisory	LWX	27 hr
Jun 25, 1:22 PM EDT	Mesoscale Discussion	SPC	113 min
Jun 25, 1:51 PM EDT	Heat Advisory	LWX	29 hr
Jun 25, 5:06 PM EDT	Severe Thunderstorm Warning	LWX	24 min
Jun 25, 5:30 PM EDT	Severe Thunderstorm Warning	LWX	34 min
Jun 26, 1:54 PM EDT	Mesoscale Discussion	SPC	2 hr
Jun 26, 2:20 PM EDT	Severe Thunderstorm Watch	SPC	8 hr
Jun 26, 9:26 PM EDT	Severe Thunderstorm Warning	LWX	49 min
Jun 26, 10:15 PM EDT	Severe Thunderstorm Warning	LWX	30 min
Jun 29, 1:07 PM EDT	Mesoscale Discussion	SPC	2 hr
Jul 1, 11:48 AM EDT	Mesoscale Discussion	SPC	117 min
Jul 1, 12:59 PM EDT	Severe Thunderstorm Watch	SPC	9 hr
Jul 1, 3:02 PM EDT	Mesoscale Discussion	SPC	118 min
Jul 1, 3:18 PM EDT	Severe Thunderstorm Warning	LWX	57 min
Jul 1, 5:56 PM EDT	Mesoscale Discussion	SPC	2 hr
Jul 1, 6:04 PM EDT	Severe Thunderstorm Warning	LWX	41 min
Jul 1, 7:23 PM EDT	Severe Thunderstorm Warning	LWX	49 min
Jul 1, 7:45 PM EDT	Tornado Warning	LWX	17 min
Jul 7, 2:17 AM EDT	Flood Watch	LWX	16 hr
Jul 7, 12:31 PM EDT	Heat Advisory	LWX	30 hr
Jul 8, 1:57 AM EDT	Flood Watch	LWX	19 hr
Jul 8, 12:34 PM EDT	Mesoscale Discussion	SPC	116 min
Jul 8, 1:42 PM EDT	Severe Thunderstorm Watch	SPC	7 hr
Jul 8, 3:32 PM EDT	Mesoscale Discussion	SPC	118 min
Jul 8, 4:36 PM EDT	Severe Thunderstorm Warning	LWX	39 min
Jul 8, 6:04 PM EDT	Severe Thunderstorm Warning	LWX	17 min
Jul 8, 6:46 PM EDT	Mesoscale Discussion	SPC	119 min
Jul 8, 7:28 PM EDT	Severe Thunderstorm Warning	LWX	47 min
Jul 8, 8:44 PM EDT	Flood Watch	LWX	24 hr
Jul 9, 12:49 PM EDT	Mesoscale Discussion	SPC	116 min
Jul 9, 2:02 PM EDT	Severe Thunderstorm Watch	SPC	8 hr
Jul 9, 3:49 PM EDT	Mesoscale Discussion	SPC	116 min
Jul 9, 7:03 PM EDT	Severe Thunderstorm Warning	LWX	30 min
Jul 9, 7:45 PM EDT	Severe Thunderstorm Warning	LWX	33 min
Jul 9, 8:35 PM EDT	Mesoscale Discussion	SPC	115 min
Jul 14, 2:36 AM EDT	Flood Watch	LWX	20 hr
Jul 14, 8:11 PM EDT	Severe Thunderstorm Warning	LWX	64 min
Jul 16, 4:39 PM EDT	Heat Advisory	LWX	27 hr
Jul 19, 8:20 PM EDT	Severe Thunderstorm Warning	LWX	25 min
Jul 19, 8:22 PM EDT	Severe Thunderstorm Warning	LWX	25 min
Jul 24, 1:23 AM EDT	Heat Advisory	LWX	43 hr
Jul 26, 1:51 PM EDT	Mesoscale Discussion	SPC	2 hr
Jul 26, 2:41 PM EDT	Heat Advisory	LWX	26 hr
Jul 27, 1:50 PM EDT	Mesoscale Discussion	SPC	115 min
Jul 27, 2:47 PM EDT	Severe Thunderstorm Warning	LWX	28 min
Jul 27, 3:05 PM EDT	Severe Thunderstorm Warning	LWX	70 min
Jul 29, 1:53 PM EDT	Heat Advisory	LWX	29 hr
Jul 30, 2:43 PM EDT	Flood Watch	LWX	28 hr
Jul 31, 1:15 PM EDT	Severe Thunderstorm Watch	SPC	7 hr
Jul 31, 4:02 PM EDT	Mesoscale Discussion	SPC	118 min
Aug 2, 6:52 AM EDT	Coastal Flood Advisory	LWX	23 hr
Aug 17, 6:28 PM EDT	Mesoscale Discussion	SPC	62 min
Aug 19, 1:51 PM EDT	Coastal Flood Advisory	LWX	18 hr
Aug 21, 9:48 AM EDT	Coastal Flood Advisory	LWX	4 days
Sep 4, 9:05 AM EDT	Coastal Flood Advisory	LWX	26 hr
Sep 4, 5:39 PM EDT	Mesoscale Discussion	SPC	96 min
Sep 6, 1:27 PM EDT	Mesoscale Discussion	SPC	2 hr
Sep 11, 11:15 AM EDT	Coastal Flood Advisory	LWX	16 hr
Sep 17, 8:38 PM EDT	Coastal Flood Advisory	LWX	8 hr
Oct 1, 8:42 AM EDT	Coastal Flood Advisory	LWX	46 hr
Oct 11, 5:17 AM EDT	Coastal Flood Advisory	LWX	49 hr
Oct 18, 9:13 AM EDT	Coastal Flood Advisory	LWX	49 hr
Oct 24, 12:19 PM EDT	Frost Advisory	LWX	21 hr
Oct 28, 1:00 PM EDT	Coastal Flood Watch	LWX	22 hr
Oct 28, 1:00 PM EDT	Coastal Flood Advisory	LWX	22 hr
Oct 28, 8:58 PM EDT	Coastal Flood Warning	LWX	58 hr
Oct 29, 10:48 AM EDT	Coastal Flood Advisory	LWX	37 hr
Oct 30, 10:26 AM EDT	Coastal Flood Advisory	LWX	17 hr
Nov 6, 12:05 PM EST	Frost Advisory	LWX	20 hr
Nov 9, 1:18 AM EST	Freeze Watch	LWX	13 hr
Nov 9, 2:21 PM EST	Freeze Warning	LWX	43 hr
Nov 15, 12:14 PM EST	Fire Weather Watch	LWX	12 hr
Nov 16, 12:05 AM EST	Red Flag Warning	LWX	18 hr
Dec 4, 1:56 AM EST	Winter Weather Advisory	LWX	34 hr
Dec 5, 12:48 PM EST	Winter Weather Advisory	LWX	18 hr
Dec 6, 7:15 PM EST	Freezing Fog Advisory	LWX	17 hr
Dec 12, 12:57 PM EST	Winter Weather Advisory	LWX	54 hr
Dec 18, 1:47 AM EST	Wind Advisory	LWX	47 hr
Dec 28, 12:11 PM EST	Wind Advisory	LWX	52 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	3
Severe Thunderstorm Watch	10
Tornado Watch	2
Mesoscale Discussion	40
Flooding
Flood Watch	7
Winter
Snow Squall Warning	1
Winter Storm Warning	2
Winter Storm Watch	2
Winter Weather Advisory	7
Heat
Extreme Heat Warning	2
Extreme Heat Watch	2
Heat Advisory	7
Cold
Freeze Warning	2
Freeze Watch	2
Cold Weather Advisory	1
Frost Advisory	2
Wind and dust
High Wind Warning	1
High Wind Watch	1
Wind Advisory	9
Fire
Red Flag Warning	2
Fire Weather Watch	1
Fog and smoke
Freezing Fog Advisory	1
Coast and beach
Coastal Flood Warning	1
Coastal Flood Watch	1
Coastal Flood Advisory	16

The busiest days

Days with the most alerts issued, by UTC date.

Nearby

Alerts in force now Tornadoes on record Forecast The radar archive 2024 2026

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.