Alert archive / Maryland / 2021

Weather alerts in Maryland, September 2021

173 weather alerts in September 2021, from the National Weather Service and the Storm Prediction Center. An alert counts here when it covered any part of the state, so the counties below add up to more than the state.

Weather alerts by county

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

Alerts
173
Warnings
106
Watches
17
Advisories
23
Busiest day
September 1, 202173 alerts

Over time

By day

Days in UTC, the clock the archive keeps.

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.

IssuedProductOfficeCountiesLasted
Aug 31, 9:06 PM EDTCoastal Flood WatchLWXAnne Arundel22 hr
Aug 31, 9:36 PM EDTRiver Flood WarningLWXWashington68 hr
Aug 31, 9:44 PM EDTRiver Flood WatchLWXFrederick25 hr
Aug 31, 9:44 PM EDTRiver Flood WatchLWXMontgomery48 hr
Aug 31, 9:44 PM EDTRiver Flood WatchLWXWashington25 hr
Aug 31, 9:44 PM EDTRiver Flood WatchLWXMontgomery25 hr
Sep 1, 12:19 AM EDTMesoscale DiscussionSPCAnne Arundel, Calvert, Charles, Montgomery, Prince George's86 min
Sep 1, 12:56 AM EDTTornado WatchSPCAnne Arundel, Baltimore, Carroll, Charles, Frederick, Harford and 4 more6 hr
Sep 1, 3:23 AM EDTAreal Flood WarningLWXMontgomery8 hr
Sep 1, 3:24 AM EDTSevere Thunderstorm WarningLWXMontgomery, Prince George's51 min
Sep 1, 3:50 AM EDTAreal Flood WarningLWXMontgomery, Prince George's6 hr
Sep 1, 4:00 AM EDTSevere Thunderstorm WarningLWXAnne Arundel, Prince George's60 min
Sep 1, 4:01 AM EDTMesoscale DiscussionSPCAnne Arundel, Baltimore, Carroll, Cecil, Harford, Howard and 4 more119 min
Sep 1, 4:10 AM EDTAreal Flood WarningLWXAnne Arundel, Baltimore, Howard, City of Baltimore6 hr
Sep 1, 4:34 AM EDTAreal Flood WarningLWXMontgomery6 hr
Sep 1, 4:39 AM EDTAreal Flood WarningLWXAnne Arundel, Baltimore, Howard, City of Baltimore5 hr
Sep 1, 4:50 AM EDTSevere Thunderstorm WarningLWXAnne Arundel, Baltimore, City of Baltimore40 min
Sep 1, 5:41 AM EDTAreal Flood WarningLWXCecil, Harford5 hr
Sep 1, 6:15 AM EDTAreal Flood WarningLWXCecil5 hr
Sep 1, 8:39 AM EDTFlash Flood WarningLWXAllegany, Garrett5 hr
Sep 1, 10:14 AM EDTCoastal Flood AdvisoryLWXAnne Arundel, Baltimore, Calvert, Cecil, Harford, Saint Mary's and 1 more19 hr
Sep 1, 11:03 AM EDTMesoscale DiscussionSPCAnne Arundel, Baltimore, Calvert, Caroline, Carroll, Cecil and 14 more2 hr
Sep 1, 11:46 AM EDTTornado WatchSPCAnne Arundel, Baltimore, Calvert, Carroll, Cecil, Charles and 11 more9 hr
Sep 1, 12:40 PM EDTTornado WatchSPCCaroline, Kent, Queen Anne's, Talbot9 hr
Sep 1, 12:52 PM EDTAreal Flood WarningLWXAllegany22 hr
Sep 1, 1:11 PM EDTTornado WarningLWXCharles, Prince George's34 min
Sep 1, 1:23 PM EDTTornado WarningLWXCharles17 min
Sep 1, 1:30 PM EDTAreal Flood WarningLWXCarroll, Frederick, Washington27 hr
Sep 1, 1:31 PM EDTTornado WarningLWXCharles, Saint Mary's29 min
Sep 1, 1:32 PM EDTMesoscale DiscussionSPCAnne Arundel, Baltimore, Calvert, Carroll, Cecil, Charles and 9 more118 min
Sep 1, 1:46 PM EDTAreal Flood WarningLWXAllegany, Garrett16 hr
Sep 1, 1:56 PM EDTTornado WarningLWXAnne Arundel, Prince George's34 min
Sep 1, 2:12 PM EDTTornado WarningLWXBaltimore33 min
Sep 1, 2:23 PM EDTTornado WarningLWXBaltimore15 min
Sep 1, 2:26 PM EDTFlash Flood Warning Considerable damage threatLWXCarroll, Frederick6 hr
Sep 1, 2:26 PM EDTTornado WarningLWXBaltimore, Harford14 min
Sep 1, 2:27 PM EDTTornado Warning Tornado observedLWXAnne Arundel15 min
Sep 1, 2:40 PM EDTSevere Thunderstorm Warning Considerable damage threatAKQDorchester, Somerset, Wicomico50 min
Sep 1, 2:48 PM EDTTornado Warning Tornado observedLWXBaltimore, Harford27 min
Sep 1, 3:03 PM EDTTornado WarningAKQSomerset, Wicomico27 min
Sep 1, 3:09 PM EDTMesoscale DiscussionSPCCaroline, Cecil, Dorchester, Harford, Kent, Queen Anne's and 2 more3 hr
Sep 1, 3:10 PM EDTTornado WarningLWXBaltimore16 min
Sep 1, 3:16 PM EDTSevere Thunderstorm WarningPHICaroline, Kent, Queen Anne's, Talbot44 min
Sep 1, 3:17 PM EDTTornado WarningLWXHarford28 min
Sep 1, 3:25 PM EDTFlash Flood Warning Considerable damage threatLWXCarroll, Frederick5 hr
Sep 1, 3:34 PM EDTFlash Flood Warning Considerable damage threatLWXCecil, Harford3 hr
Sep 1, 3:36 PM EDTWind AdvisoryLWXAllegany, Carroll, Frederick, Washington7 hr
Sep 1, 3:49 PM EDTTornado WarningLWXCecil, Harford26 min
Sep 1, 3:56 PM EDTSevere Thunderstorm WarningAKQDorchester, Somerset, Wicomico49 min
Sep 1, 4:07 PM EDTBeach Hazards StatementAKQWorcester28 hr
Sep 1, 4:07 PM EDTCoastal Flood WarningAKQDorchester, Somerset, Wicomico12 hr
Sep 1, 4:09 PM EDTTornado WarningAKQDorchester36 min
Sep 1, 4:13 PM EDTRiver Flood WatchLWXCecil7 hr
Sep 1, 4:13 PM EDTRiver Flood WarningLWXAllegany7 hr
Sep 1, 4:14 PM EDTRiver Flood WarningLWXAllegany9 hr
Sep 1, 4:25 PM EDTTornado WarningAKQDorchester35 min
Sep 1, 4:37 PM EDTAreal Flood WarningLWXBaltimore, Carroll, Harford13 hr
Sep 1, 4:58 PM EDTTornado Warning Tornado observedAKQDorchester32 min
Sep 1, 4:59 PM EDTTornado WarningPHICaroline46 min
Sep 1, 5:01 PM EDTTornado WarningPHICaroline, Kent, Queen Anne's44 min
Sep 1, 5:04 PM EDTSevere Thunderstorm WarningAKQDorchester, Wicomico41 min
Sep 1, 5:16 PM EDTSevere Thunderstorm WarningPHICaroline, Queen Anne's, Talbot44 min
Sep 1, 5:36 PM EDTTornado WarningPHIKent24 min
Sep 1, 5:46 PM EDTTornado WarningLWXCecil29 min
Sep 1, 6:08 PM EDTAreal Flood WarningLWXCecil, Harford17 hr
Sep 1, 6:12 PM EDTTornado WarningLWXCecil19 min
Sep 1, 6:48 PM EDTSpecial Weather StatementAKQSomerset, Wicomico42 min
Sep 1, 6:53 PM EDTSevere Thunderstorm WarningAKQDorchester, Somerset, Wicomico52 min
Sep 1, 6:57 PM EDTSevere Thunderstorm WarningPHICaroline63 min
Sep 1, 7:03 PM EDTCoastal Flood WarningLWXAnne Arundel8 hr
Sep 1, 7:27 PM EDTAreal Flood WarningLWXAllegany, Washington15 hr
Sep 1, 7:29 PM EDTSevere Thunderstorm WarningAKQSomerset, Wicomico, Worcester46 min
Sep 1, 7:59 PM EDTAreal Flood WarningLWXCarroll, Frederick2 hr
Sep 1, 8:16 PM EDTAreal Flood WarningLWXCarroll, Frederick6 hr
Sep 1, 8:45 PM EDTAreal Flood AdvisoryAKQDorchester3 hr
Sep 2, 12:48 AM EDTRiver Flood WarningLWXFrederick27 hr
Sep 2, 12:55 AM EDTRiver Flood WatchLWXWashington4 hr
Sep 2, 4:52 AM EDTRiver Flood WarningLWXWashington23 hr
Sep 2, 5:01 AM EDTRiver Flood WatchLWXCecil6 hr
Sep 2, 11:05 AM EDTRiver Flood WarningLWXCecil, Harford22 hr
Sep 2, 11:26 AM EDTRiver Flood WatchLWXFrederick33 hr
Sep 2, 9:36 PM EDTRiver Flood WarningLWXMontgomery15 hr
Sep 3, 3:01 AM EDTCoastal Flood AdvisoryLWXHarford6 hr
Sep 5, 3:09 PM EDTCoastal Flood StatementAKQDorchester13 hr
Sep 7, 3:33 PM EDTCoastal Flood StatementAKQDorchester12 hr
Sep 7, 8:07 PM EDTBeach Hazards StatementAKQWorcester4 days
Sep 7, 10:46 PM EDTCoastal Flood AdvisoryLWXAnne Arundel, Baltimore, Harford, City of Baltimore12 hr
Sep 8, 10:41 AM EDTCoastal Flood StatementAKQDorchester6 hr
Sep 8, 2:28 PM EDTCoastal Flood AdvisoryLWXAnne Arundel, Baltimore, Harford, City of Baltimore11 hr
Sep 8, 3:45 PM EDTSpecial Weather StatementAKQSomerset, Worcester45 min
Sep 8, 3:52 PM EDTSevere Thunderstorm WarningAKQSomerset, Worcester30 min
Sep 8, 6:11 PM EDTFlash Flood WatchLWXAnne Arundel, Baltimore, Carroll, Cecil, Frederick, Harford and 4 more10 hr
Sep 8, 7:14 PM EDTCoastal Flood AdvisoryAKQDorchester11 hr
Sep 8, 8:29 PM EDTSevere Thunderstorm WatchSPCAnne Arundel, Baltimore, Carroll, Cecil, Frederick, Harford and 5 more4 hr
Sep 8, 9:11 PM EDTSevere Thunderstorm WarningLWXFrederick, Washington64 min
Sep 8, 9:21 PM EDTSevere Thunderstorm WarningLWXCarroll, Frederick54 min
Sep 8, 10:18 PM EDTAreal Flood WarningLWXCarroll, Frederick3 hr
Sep 8, 10:42 PM EDTMesoscale DiscussionSPCBaltimore, Carroll, Cecil, Harford, Howard, Montgomery and 1 more2 hr
Sep 8, 11:02 PM EDTFlash Flood Warning Considerable damage threatLWXFrederick78 min
Sep 8, 11:05 PM EDTAreal Flood WarningLWXCarroll, Frederick5 hr
Sep 8, 11:57 PM EDTAreal Flood WarningLWXCarroll, Frederick, Howard4 hr
Sep 9, 12:17 AM EDTSevere Thunderstorm WarningLWXBaltimore, Cecil, Harford43 min
Sep 9, 3:29 AM EDTCoastal Flood AdvisoryLWXAnne Arundel6 hr
Sep 9, 5:37 AM EDTAreal Flood AdvisoryPHICaroline, Kent, Queen Anne's, Talbot3 hr
Sep 9, 8:01 AM EDTSpecial Weather StatementAKQWorcester44 min
Sep 15, 2:54 PM EDTCoastal Flood AdvisoryLWXAnne Arundel, Baltimore, Harford, City of Baltimore13 hr
Sep 15, 3:45 PM EDTSevere Thunderstorm WarningLWXAllegany16 min
Sep 15, 5:15 PM EDTSevere Thunderstorm WarningLWXWashington30 min
Sep 15, 5:42 PM EDTSevere Thunderstorm WarningLWXFrederick, Washington48 min
Sep 15, 5:52 PM EDTAreal Flood WarningLWXWashington115 min
Sep 15, 5:52 PM EDTSevere Thunderstorm WarningLWXWashington38 min
Sep 15, 6:20 PM EDTFlash Flood Warning Considerable damage threatLWXWashington2 hr
Sep 15, 6:23 PM EDTSevere Thunderstorm WarningLWXFrederick, Washington52 min
Sep 15, 6:28 PM EDTSevere Thunderstorm WarningLWXFrederick, Washington34 min
Sep 15, 6:35 PM EDTAreal Flood WarningLWXFrederick, Washington113 min
Sep 15, 7:22 PM EDTFlash Flood Warning Considerable damage threatLWXFrederick, Washington64 min
Sep 15, 8:24 PM EDTAreal Flood WarningLWXFrederick, Washington2 hr
Sep 15, 9:38 PM EDTSevere Thunderstorm WarningLWXBaltimore, Cecil, Harford52 min
Sep 15, 10:57 PM EDTSpecial Weather StatementPHIKent48 min
Sep 16, 2:44 PM EDTFlash Flood WatchLWXAnne Arundel, Baltimore, Carroll, Frederick, Harford, Howard and 3 more6 hr
Sep 16, 3:19 PM EDTAreal Flood AdvisoryPHIKent3 hr
Sep 16, 3:21 PM EDTAreal Flood WarningLWXMontgomery, Prince George's6 hr
Sep 16, 4:19 PM EDTBeach Hazards StatementAKQWorcester51 hr
Sep 16, 5:36 PM EDTAreal Flood WarningLWXCarroll, Frederick, Howard, Montgomery6 hr
Sep 16, 6:00 PM EDTAreal Flood WarningLWXBaltimore, City of Baltimore4 hr
Sep 16, 7:07 PM EDTAreal Flood WarningLWXCarroll, Frederick6 hr
Sep 19, 2:54 AM EDTCoastal Flood AdvisoryLWXAnne Arundel3 hr
Sep 21, 3:04 AM EDTFlash Flood WatchLWXAllegany, Baltimore, Carroll, Cecil, Frederick, Harford and 4 more57 hr
Sep 21, 3:11 AM EDTCoastal Flood AdvisoryLWXAnne Arundel, Saint Mary's20 hr
Sep 21, 11:50 AM EDTCoastal Flood StatementAKQDorchester5 hr
Sep 21, 4:53 PM EDTBeach Hazards StatementAKQWorcester51 hr
Sep 22, 1:15 AM EDTCoastal Flood AdvisoryLWXSaint Mary's4 hr
Sep 22, 3:14 AM EDTCoastal Flood WatchLWXAnne Arundel6 hr
Sep 22, 3:14 AM EDTCoastal Flood AdvisoryLWXAnne Arundel, Baltimore, Calvert, Cecil, Charles, Harford and 2 more46 hr
Sep 22, 6:36 AM EDTCoastal Flood StatementAKQDorchester4 hr
Sep 22, 9:39 AM EDTCoastal Flood WarningLWXAnne Arundel, Saint Mary's34 hr
Sep 22, 10:39 AM EDTCoastal Flood StatementAKQSomerset, Wicomico18 hr
Sep 22, 10:39 AM EDTCoastal Flood AdvisoryAKQDorchester, Somerset, Wicomico35 hr
Sep 22, 4:22 PM EDTSevere Thunderstorm WarningLWXCharles, Prince George's, Saint Mary's38 min
Sep 22, 5:01 PM EDTCoastal Flood AdvisoryPHICaroline, Kent, Queen Anne's, Talbot22 hr
Sep 22, 5:39 PM EDTSevere Thunderstorm WarningLWXAnne Arundel, Baltimore, Carroll, Howard, Montgomery, Prince George's51 min
Sep 22, 6:14 PM EDTMesoscale DiscussionSPCAnne Arundel, Baltimore, Calvert, Caroline, Cecil, Dorchester and 9 more2 hr
Sep 22, 6:20 PM EDTSevere Thunderstorm WarningLWXBaltimore, Carroll25 min
Sep 23, 12:25 AM EDTCoastal Flood AdvisoryLWXCharles8 hr
Sep 23, 2:02 AM EDTAreal Flood WarningLWXFrederick, Washington10 hr
Sep 23, 2:34 AM EDTFlash Flood Warning Considerable damage threatLWXFrederick, Washington3 hr
Sep 23, 3:13 AM EDTMesoscale DiscussionSPCAnne Arundel, Baltimore, Calvert, Caroline, Carroll, Cecil and 14 more5 hr
Sep 23, 3:47 AM EDTAreal Flood WarningLWXMontgomery12 hr
Sep 23, 3:53 AM EDTAreal Flood WarningLWXCarroll, Frederick17 hr
Sep 23, 4:17 AM EDTFlash Flood Warning Considerable damage threatLWXFrederick3 hr
Sep 23, 4:41 AM EDTAreal Flood WarningLWXHoward, Montgomery9 hr
Sep 23, 5:35 AM EDTAreal Flood WarningLWXCarroll, Frederick6 hr
Sep 23, 7:08 AM EDTRiver Flood WarningLWXMontgomery16 hr
Sep 23, 7:56 AM EDTSevere Thunderstorm WarningLWXBaltimore, Harford22 min
Sep 23, 8:04 AM EDTAreal Flood WarningLWXAnne Arundel, Baltimore, Harford, Howard, Montgomery, Prince George's and 1 more10 hr
Sep 23, 8:08 AM EDTSpecial Weather StatementPHIKent, Queen Anne's, Talbot52 min
Sep 23, 9:02 AM EDTAreal Flood WarningLWXCecil9 hr
Sep 23, 9:03 AM EDTAreal Flood AdvisoryPHIKent, Queen Anne's, Talbot3 hr
Sep 23, 9:04 AM EDTSpecial Weather StatementAKQDorchester41 min
Sep 23, 9:23 AM EDTAreal Flood AdvisoryAKQDorchester3 hr
Sep 23, 9:27 AM EDTSevere Thunderstorm WarningLWXCecil, Harford78 min
Sep 23, 9:31 AM EDTSpecial Weather StatementPHIKent, Queen Anne's, Talbot59 min
Sep 23, 9:46 AM EDTSevere Thunderstorm WarningPHICaroline, Kent, Queen Anne's, Talbot44 min
Sep 23, 9:49 AM EDTFlash Flood WarningPHIKent, Queen Anne's, Talbot4 hr
Sep 23, 9:52 AM EDTSpecial Weather StatementAKQDorchester53 min
Sep 23, 10:30 AM EDTMesoscale DiscussionSPCCaroline, Cecil, Wicomico2 hr
Sep 23, 10:35 AM EDTSevere Thunderstorm WarningPHICaroline, Kent, Queen Anne's40 min
Sep 23, 10:55 AM EDTAreal Flood AdvisoryPHICaroline, Kent, Queen Anne's, Talbot3 hr
Sep 23, 12:11 PM EDTAreal Flood WarningLWXFrederick5 hr
Sep 23, 1:18 PM EDTRiver Flood WarningLWXFrederick25 hr
Sep 23, 2:15 PM EDTCoastal Flood AdvisoryLWXCharles6 hr
Sep 24, 9:55 PM EDTCoastal Flood AdvisoryLWXHarford5 hr
Sep 28, 10:12 AM EDTAreal Flood WarningLWXGarrett97 min

By product

Every kind of product issued here, grouped by hazard. Each opens the same place narrowed to that product.

By county

Every county with at least one alert. A county page lists each alert that covered it.

Nearby

Alerts in force nowTornadoes on recordThe radar archive20202022

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. Rebuilt daily.