Alert archive / Maryland / Harford County

Weather alerts in Harford County, Maryland, 2021

214 weather alerts in 2021, from the National Weather Service and the Storm Prediction Center. An alert counts here when it covered this county.

Harford County and its neighbors

Each county as a circle sized by its count in 2021. Tap one for its archive.

Alerts: 214
Warnings: 79
Watches: 40
Advisories: 46
Busiest month: July36 alerts
Busiest day: September 1, 202115 alerts

Over time

By month

Warning verification

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

2 of 7 tornado warnings covering Harford County in 2021 had a tornado report inside them.

Harford County, 2021

	Warnings	With a report	False alarm ratio	Reports	Inside a warning	Mean lead time
Tornado warnings	7	2	71%	0
Severe thunderstorm warnings	42	36	14%	55	89%	22 min
Flash flood warnings	3	1	67%	13	54%	63 min

Each office's whole area, 2021

	Warnings	With a report	False alarm ratio	Reports	Inside a warning	Mean lead time
NWS Baltimore/Washington: tornado warnings	49	10	80%	13	100%	11 min
NWS Baltimore/Washington: severe thunderstorm warnings	544	396	27%	1,446	83%	20 min
NWS Baltimore/Washington: flash flood warnings	76	32	58%	96	77%	60 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 25, 1:05 AM EST	Winter Weather Advisory	LWX	36 hr
Jan 29, 3:10 PM EST	Winter Storm Watch	LWX	23 hr
Jan 30, 9:02 AM EST	Winter Storm Warning	LWX	69 hr
Jan 31, 6:50 PM EST	Winter Weather Advisory	LWX	42 hr
Feb 5, 3:13 PM EST	Winter Storm Watch	LWX	12 hr
Feb 6, 3:22 AM EST	Winter Storm Warning	LWX	33 hr
Feb 10, 3:33 AM EST	Winter Weather Advisory	LWX	30 hr
Feb 10, 12:40 PM EST	Winter Storm Warning	LWX	21 hr
Feb 12, 3:10 PM EST	Winter Weather Advisory	LWX	43 hr
Feb 13, 10:02 AM EST	Mesoscale Discussion	SPC	6 hr
Feb 14, 10:00 AM EST	Winter Weather Advisory	LWX	44 hr
Feb 15, 4:24 AM EST	Winter Weather Advisory	LWX	25 hr
Feb 16, 4:56 AM EST	Winter Storm Watch	LWX	29 hr
Feb 17, 3:24 AM EST	Winter Storm Warning	LWX	57 hr
Feb 18, 10:23 AM EST	Mesoscale Discussion	SPC	3 hr
Feb 18, 1:05 PM EST	Winter Weather Advisory	LWX	23 hr
Feb 21, 3:17 PM EST	Winter Weather Advisory	LWX	24 hr
Feb 28, 9:09 PM EST	Dense Fog Advisory	LWX	8 hr
Mar 1, 5:26 AM EST	Wind Advisory	LWX	19 hr
Mar 10, 3:43 PM EST	Fire Weather Watch	LWX	12 hr
Mar 11, 3:28 AM EST	Red Flag Warning	LWX	15 hr
Mar 13, 1:53 PM EST	Fire Weather Watch	LWX	13 hr
Mar 14, 4:01 AM EDT	Red Flag Warning	LWX	18 hr
Mar 24, 9:09 PM EDT	Dense Fog Advisory	LWX	14 hr
Mar 25, 2:41 PM EDT	Wind Advisory	LWX	27 hr
Mar 28, 4:16 AM EDT	Wind Advisory	LWX	23 hr
Mar 28, 5:05 PM EDT	Severe Thunderstorm Watch	SPC	4 hr
Mar 28, 5:37 PM EDT	Severe Thunderstorm Warning	LWX	38 min
Mar 28, 5:43 PM EDT	Severe Thunderstorm Warning	LWX	47 min
Apr 11, 4:54 PM EDT	Mesoscale Discussion	SPC	2 hr
Apr 11, 9:01 PM EDT	Severe Thunderstorm Warning	LWX	44 min
Apr 11, 9:16 PM EDT	Severe Thunderstorm Warning	LWX	44 min
Apr 11, 10:03 PM EDT	Areal Flood Warning	LWX	2 hr
Apr 11, 10:18 PM EDT	Areal Flood Warning	LWX	2 hr
Apr 12, 9:38 PM EDT	Coastal Flood Advisory	LWX	14 hr
Apr 13, 9:05 PM EDT	Coastal Flood Advisory	LWX	15 hr
Apr 21, 4:08 AM EDT	Freeze Warning	LWX	29 hr
Apr 21, 12:22 PM EDT	Mesoscale Discussion	SPC	113 min
Apr 22, 12:03 PM EDT	Frost Advisory	LWX	20 hr
Apr 22, 12:03 PM EDT	Freeze Warning	LWX	20 hr
Apr 29, 3:59 AM EDT	High Wind Watch	LWX	16 hr
Apr 29, 8:18 PM EDT	High Wind Warning	LWX	25 hr
Apr 29, 8:18 PM EDT	Wind Advisory	LWX	30 hr
May 3, 7:16 PM EDT	Mesoscale Discussion	SPC	29 min
May 4, 1:51 PM EDT	Severe Thunderstorm Watch	SPC	6 hr
May 5, 1:03 PM EDT	Mesoscale Discussion	SPC	2 hr
May 26, 3:41 AM EDT	Coastal Flood Advisory	LWX	6 hr
May 26, 1:21 PM EDT	Mesoscale Discussion	SPC	84 min
May 26, 2:48 PM EDT	Severe Thunderstorm Watch	SPC	7 hr
May 26, 4:41 PM EDT	Mesoscale Discussion	SPC	64 min
May 26, 5:26 PM EDT	Severe Thunderstorm Warning	LWX	49 min
May 26, 6:17 PM EDT	Severe Thunderstorm Warning	LWX	58 min
May 26, 6:34 PM EDT	Mesoscale Discussion	SPC	116 min
May 26, 7:53 PM EDT	Severe Thunderstorm Warning	LWX	52 min
May 26, 8:27 PM EDT	Special Weather Statement	CTP	18 min
Jun 3, 8:56 AM EDT	Flash Flood Watch	LWX	13 hr
Jun 3, 1:46 PM EDT	Mesoscale Discussion	SPC	119 min
Jun 3, 2:48 PM EDT	Severe Thunderstorm Watch	SPC	6 hr
Jun 3, 4:43 PM EDT	Severe Thunderstorm Warning	LWX	47 min
Jun 3, 4:47 PM EDT	Mesoscale Discussion	SPC	88 min
Jun 3, 4:51 PM EDT	Tornado Warning	LWX	9 min
Jun 3, 4:58 PM EDT	Areal Flood Warning	LWX	6 hr
Jun 3, 4:59 PM EDT	Tornado Warning	LWX	16 min
Jun 3, 5:26 PM EDT	Severe Thunderstorm Warning	LWX	49 min
Jun 3, 5:55 PM EDT	Areal Flood Warning	LWX	34 min
Jun 3, 6:14 PM EDT	Severe Thunderstorm Warning	LWX	34 min
Jun 3, 6:29 PM EDT	Flash Flood Warning Considerable damage threat	LWX	3 hr
Jun 3, 6:36 PM EDT	Severe Thunderstorm Warning	LWX	39 min
Jun 3, 6:53 PM EDT	Tornado Warning	LWX	10 min
Jun 3, 9:00 PM EDT	Areal Flood Warning	LWX	113 min
Jun 4, 2:26 PM EDT	Mesoscale Discussion	SPC	94 min
Jun 4, 4:12 PM EDT	Mesoscale Discussion	SPC	93 min
Jun 8, 3:32 PM EDT	Areal Flood Warning	LWX	4 hr
Jun 10, 2:53 AM EDT	Flash Flood Watch	LWX	43 hr
Jun 14, 6:41 PM EDT	Mesoscale Discussion	SPC	2 hr
Jun 14, 7:29 PM EDT	Severe Thunderstorm Watch	SPC	6 hr
Jun 14, 9:29 PM EDT	Severe Thunderstorm Warning	LWX	46 min
Jun 14, 10:12 PM EDT	Severe Thunderstorm Warning	LWX	33 min
Jun 21, 1:51 PM EDT	Mesoscale Discussion	SPC	114 min
Jun 21, 2:20 PM EDT	Severe Thunderstorm Watch	SPC	6 hr
Jun 21, 6:14 PM EDT	Severe Thunderstorm Warning	LWX	46 min
Jun 21, 6:15 PM EDT	Mesoscale Discussion	SPC	60 min
Jun 21, 6:28 PM EDT	Severe Thunderstorm Warning	LWX	47 min
Jun 21, 6:51 PM EDT	Severe Thunderstorm Warning	LWX	39 min
Jun 30, 3:23 AM EDT	Heat Advisory	LWX	16 hr
Jun 30, 2:23 PM EDT	Flash Flood Watch	LWX	42 hr
Jul 1, 11:45 AM EDT	Mesoscale Discussion	SPC	2 hr
Jul 1, 12:46 PM EDT	Severe Thunderstorm Watch	SPC	7 hr
Jul 1, 2:36 PM EDT	Mesoscale Discussion	SPC	84 min
Jul 1, 3:26 PM EDT	Severe Thunderstorm Warning	LWX	38 min
Jul 6, 3:01 AM EDT	Heat Advisory	LWX	17 hr
Jul 6, 1:32 PM EDT	Severe Thunderstorm Watch	SPC	8 hr
Jul 6, 4:23 PM EDT	Mesoscale Discussion	SPC	97 min
Jul 7, 3:12 PM EDT	Flash Flood Watch	LWX	33 hr
Jul 9, 2:15 PM EDT	Mesoscale Discussion	SPC	2 hr
Jul 9, 6:03 PM EDT	Severe Thunderstorm Warning	LWX	57 min
Jul 12, 1:32 PM EDT	Mesoscale Discussion	SPC	88 min
Jul 12, 3:34 PM EDT	Severe Thunderstorm Watch	SPC	5 hr
Jul 12, 6:28 PM EDT	Severe Thunderstorm Warning	LWX	47 min
Jul 12, 7:08 PM EDT	Severe Thunderstorm Warning	LWX	52 min
Jul 12, 7:23 PM EDT	Severe Thunderstorm Warning	LWX	52 min
Jul 12, 7:25 PM EDT	Mesoscale Discussion	SPC	2 hr
Jul 12, 7:40 PM EDT	Areal Flood Warning	LWX	6 hr
Jul 12, 7:55 PM EDT	Flash Flood Warning	LWX	77 min
Jul 16, 2:57 PM EDT	Heat Advisory	LWX	28 hr
Jul 16, 10:20 PM EDT	Flash Flood Watch	LWX	24 hr
Jul 17, 12:00 PM EDT	Mesoscale Discussion	SPC	3 hr
Jul 17, 1:13 PM EDT	Severe Thunderstorm Watch	SPC	10 hr
Jul 17, 2:40 PM EDT	Severe Thunderstorm Warning	LWX	50 min
Jul 17, 2:59 PM EDT	Severe Thunderstorm Warning	LWX	31 min
Jul 17, 3:02 PM EDT	Mesoscale Discussion	SPC	88 min
Jul 17, 3:27 PM EDT	Severe Thunderstorm Warning	LWX	63 min
Jul 17, 4:38 PM EDT	Mesoscale Discussion	SPC	97 min
Jul 17, 6:54 PM EDT	Mesoscale Discussion	SPC	2 hr
Jul 17, 7:55 PM EDT	Severe Thunderstorm Warning	LWX	27 min
Jul 21, 10:32 AM EDT	Mesoscale Discussion	SPC	58 min
Jul 21, 11:56 AM EDT	Severe Thunderstorm Watch	SPC	7 hr
Jul 25, 12:31 AM EDT	Coastal Flood Advisory	LWX	13 hr
Jul 25, 11:15 PM EDT	Areal Flood Warning	LWX	6 hr
Jul 26, 12:18 AM EDT	Areal Flood Warning	LWX	5 hr
Jul 29, 2:23 PM EDT	Tornado Watch	SPC	8 hr
Jul 29, 4:26 PM EDT	Mesoscale Discussion	SPC	94 min
Aug 9, 3:52 PM EDT	Severe Thunderstorm Warning	LWX	19 min
Aug 10, 1:33 PM EDT	Excessive Heat Watch	LWX	37 hr
Aug 10, 1:33 PM EDT	Heat Advisory	LWX	29 hr
Aug 10, 2:30 PM EDT	Mesoscale Discussion	SPC	3 hr
Aug 10, 6:55 PM EDT	Severe Thunderstorm Warning	LWX	50 min
Aug 10, 7:04 PM EDT	Severe Thunderstorm Warning	LWX	41 min
Aug 11, 2:02 PM EDT	Severe Thunderstorm Watch	SPC	6 hr
Aug 11, 3:47 PM EDT	Mesoscale Discussion	SPC	88 min
Aug 11, 5:32 PM EDT	Severe Thunderstorm Warning	LWX	43 min
Aug 11, 6:14 PM EDT	Severe Thunderstorm Warning	LWX	27 min
Aug 12, 2:15 AM EDT	Heat Advisory	LWX	18 hr
Aug 12, 6:04 PM EDT	Heat Advisory	LWX	25 hr
Aug 13, 12:33 PM EDT	Mesoscale Discussion	SPC	87 min
Aug 13, 1:11 PM EDT	Severe Thunderstorm Watch	SPC	7 hr
Aug 13, 4:48 PM EDT	Mesoscale Discussion	SPC	87 min
Aug 13, 4:49 PM EDT	Severe Thunderstorm Warning	LWX	41 min
Aug 13, 4:59 PM EDT	Severe Thunderstorm Warning	LWX	46 min
Aug 13, 5:20 PM EDT	Severe Thunderstorm Warning	LWX	40 min
Aug 13, 5:22 PM EDT	Severe Thunderstorm Warning	LWX	38 min
Aug 13, 5:34 PM EDT	Special Weather Statement	CTP	41 min
Aug 13, 5:52 PM EDT	Severe Thunderstorm Warning	LWX	24 min
Aug 17, 8:54 AM EDT	Flash Flood Watch	LWX	9 hr
Aug 17, 1:54 PM EDT	Flash Flood Watch	LWX	27 hr
Aug 18, 10:58 AM EDT	Mesoscale Discussion	SPC	92 min
Aug 18, 11:37 AM EDT	Tornado Watch	SPC	11 hr
Aug 18, 3:29 PM EDT	Mesoscale Discussion	SPC	91 min
Aug 18, 4:57 PM EDT	Mesoscale Discussion	SPC	93 min
Aug 18, 7:01 PM EDT	Coastal Flood Advisory	LWX	14 hr
Aug 27, 2:56 AM EDT	Flash Flood Watch	LWX	17 hr
Aug 27, 1:41 PM EDT	Mesoscale Discussion	SPC	3 hr
Aug 27, 5:52 PM EDT	Severe Thunderstorm Warning	LWX	53 min
Aug 27, 6:13 PM EDT	Areal Flood Warning	LWX	3 hr
Aug 27, 6:17 PM EDT	Severe Thunderstorm Warning	LWX	29 min
Aug 30, 4:54 AM EDT	Flash Flood Watch	LWX	62 hr
Aug 30, 11:48 AM EDT	Flash Flood Watch	LWX	6 hr
Sep 1, 12:56 AM EDT	Tornado Watch	SPC	6 hr
Sep 1, 4:01 AM EDT	Mesoscale Discussion	SPC	119 min
Sep 1, 5:41 AM EDT	Areal Flood Warning	LWX	5 hr
Sep 1, 10:14 AM EDT	Coastal Flood Advisory	LWX	19 hr
Sep 1, 11:03 AM EDT	Mesoscale Discussion	SPC	2 hr
Sep 1, 11:46 AM EDT	Tornado Watch	SPC	9 hr
Sep 1, 1:32 PM EDT	Mesoscale Discussion	SPC	118 min
Sep 1, 2:26 PM EDT	Tornado Warning	LWX	14 min
Sep 1, 2:48 PM EDT	Tornado Warning Tornado observed	LWX	27 min
Sep 1, 3:09 PM EDT	Mesoscale Discussion	SPC	3 hr
Sep 1, 3:17 PM EDT	Tornado Warning	LWX	28 min
Sep 1, 3:34 PM EDT	Flash Flood Warning Considerable damage threat	LWX	3 hr
Sep 1, 3:49 PM EDT	Tornado Warning	LWX	26 min
Sep 1, 4:37 PM EDT	Areal Flood Warning	LWX	13 hr
Sep 1, 6:08 PM EDT	Areal Flood Warning	LWX	17 hr
Sep 2, 11:05 AM EDT	River Flood Warning	LWX	22 hr
Sep 3, 3:01 AM EDT	Coastal Flood Advisory	LWX	6 hr
Sep 7, 10:46 PM EDT	Coastal Flood Advisory	LWX	12 hr
Sep 8, 2:28 PM EDT	Coastal Flood Advisory	LWX	11 hr
Sep 8, 6:11 PM EDT	Flash Flood Watch	LWX	10 hr
Sep 8, 8:29 PM EDT	Severe Thunderstorm Watch	SPC	4 hr
Sep 8, 10:42 PM EDT	Mesoscale Discussion	SPC	2 hr
Sep 9, 12:17 AM EDT	Severe Thunderstorm Warning	LWX	43 min
Sep 15, 2:54 PM EDT	Coastal Flood Advisory	LWX	13 hr
Sep 15, 9:38 PM EDT	Severe Thunderstorm Warning	LWX	52 min
Sep 16, 2:44 PM EDT	Flash Flood Watch	LWX	6 hr
Sep 21, 3:04 AM EDT	Flash Flood Watch	LWX	57 hr
Sep 22, 3:14 AM EDT	Coastal Flood Advisory	LWX	46 hr
Sep 22, 6:14 PM EDT	Mesoscale Discussion	SPC	2 hr
Sep 23, 3:13 AM EDT	Mesoscale Discussion	SPC	5 hr
Sep 23, 7:56 AM EDT	Severe Thunderstorm Warning	LWX	22 min
Sep 23, 8:04 AM EDT	Areal Flood Warning	LWX	10 hr
Sep 23, 9:27 AM EDT	Severe Thunderstorm Warning	LWX	78 min
Sep 24, 9:55 PM EDT	Coastal Flood Advisory	LWX	5 hr
Oct 3, 5:00 AM EDT	Dense Fog Advisory	LWX	6 hr
Oct 4, 4:44 PM EDT	Mesoscale Discussion	SPC	2 hr
Oct 10, 2:29 PM EDT	Coastal Flood Advisory	LWX	33 hr
Oct 14, 2:36 AM EDT	Dense Fog Advisory	LWX	7 hr
Oct 15, 3:11 PM EDT	Coastal Flood Advisory	LWX	30 hr
Oct 16, 1:50 PM EDT	Mesoscale Discussion	SPC	115 min
Oct 25, 6:35 PM EDT	Severe Thunderstorm Warning	LWX	40 min
Oct 25, 6:41 PM EDT	Mesoscale Discussion	SPC	2 hr
Oct 27, 10:50 AM EDT	Coastal Flood Watch	LWX	29 hr
Oct 28, 4:29 AM EDT	Coastal Flood Warning	LWX	72 hr
Oct 28, 4:29 AM EDT	Coastal Flood Advisory	LWX	12 hr
Oct 28, 2:24 PM EDT	Wind Advisory	LWX	26 hr
Oct 29, 5:30 PM EDT	Areal Flood Warning	LWX	4 hr
Oct 30, 4:22 AM EDT	Coastal Flood Advisory	LWX	49 hr
Nov 1, 3:03 AM EDT	Freeze Watch	LWX	24 hr
Nov 2, 3:22 AM EDT	Frost Advisory	LWX	30 hr
Nov 2, 3:22 AM EDT	Freeze Warning	LWX	30 hr
Nov 9, 4:48 PM EST	Coastal Flood Advisory	LWX	9 hr
Nov 26, 1:48 PM EST	Wind Advisory	LWX	3 hr
Dec 6, 11:09 AM EST	Wind Advisory	LWX	14 hr
Dec 10, 10:48 AM EST	Wind Advisory	LWX	38 hr
Dec 11, 7:29 PM EST	Mesoscale Discussion	SPC	3 hr
Dec 30, 10:18 PM EST	Dense Fog Advisory	LWX	14 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	42
Tornado Warning	7
Severe Thunderstorm Watch	14
Tornado Watch	4
Mesoscale Discussion	47
Special Weather Statement	2
Flooding
Areal Flood Warning	15
Flash Flood Warning	3
River Flood Warning	1
Flash Flood Watch	13
Winter
Winter Storm Warning	4
Winter Storm Watch	3
Winter Weather Advisory	8
Heat
Excessive Heat Watch	1
Heat Advisory	6
Cold
Freeze Warning	3
Freeze Watch	1
Frost Advisory	2
Wind and dust
High Wind Warning	1
High Wind Watch	1
Wind Advisory	8
Fire
Red Flag Warning	2
Fire Weather Watch	2
Fog and smoke
Dense Fog Advisory	5
Coast and beach
Coastal Flood Warning	1
Coastal Flood Watch	1
Coastal Flood Advisory	17

The busiest days

Days with the most alerts issued, by UTC date.

Nearby

Alerts in force now Tornadoes on record Forecast The radar archive 2020 2022

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.