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.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Aug 31, 9:06 PM EDT | Coastal Flood Watch | LWX | Anne Arundel | 22 hr |
| Aug 31, 9:36 PM EDT | River Flood Warning | LWX | Washington | 68 hr |
| Aug 31, 9:44 PM EDT | River Flood Watch | LWX | Frederick | 25 hr |
| Aug 31, 9:44 PM EDT | River Flood Watch | LWX | Montgomery | 48 hr |
| Aug 31, 9:44 PM EDT | River Flood Watch | LWX | Washington | 25 hr |
| Aug 31, 9:44 PM EDT | River Flood Watch | LWX | Montgomery | 25 hr |
| Sep 1, 12:19 AM EDT | Mesoscale Discussion | SPC | Anne Arundel, Calvert, Charles, Montgomery, Prince George's | 86 min |
| Sep 1, 12:56 AM EDT | Tornado Watch | SPC | Anne Arundel, Baltimore, Carroll, Charles, Frederick, Harford and 4 more | 6 hr |
| Sep 1, 3:23 AM EDT | Areal Flood Warning | LWX | Montgomery | 8 hr |
| Sep 1, 3:24 AM EDT | Severe Thunderstorm Warning | LWX | Montgomery, Prince George's | 51 min |
| Sep 1, 3:50 AM EDT | Areal Flood Warning | LWX | Montgomery, Prince George's | 6 hr |
| Sep 1, 4:00 AM EDT | Severe Thunderstorm Warning | LWX | Anne Arundel, Prince George's | 60 min |
| Sep 1, 4:01 AM EDT | Mesoscale Discussion | SPC | Anne Arundel, Baltimore, Carroll, Cecil, Harford, Howard and 4 more | 119 min |
| Sep 1, 4:10 AM EDT | Areal Flood Warning | LWX | Anne Arundel, Baltimore, Howard, City of Baltimore | 6 hr |
| Sep 1, 4:34 AM EDT | Areal Flood Warning | LWX | Montgomery | 6 hr |
| Sep 1, 4:39 AM EDT | Areal Flood Warning | LWX | Anne Arundel, Baltimore, Howard, City of Baltimore | 5 hr |
| Sep 1, 4:50 AM EDT | Severe Thunderstorm Warning | LWX | Anne Arundel, Baltimore, City of Baltimore | 40 min |
| Sep 1, 5:41 AM EDT | Areal Flood Warning | LWX | Cecil, Harford | 5 hr |
| Sep 1, 6:15 AM EDT | Areal Flood Warning | LWX | Cecil | 5 hr |
| Sep 1, 8:39 AM EDT | Flash Flood Warning | LWX | Allegany, Garrett | 5 hr |
| Sep 1, 10:14 AM EDT | Coastal Flood Advisory | LWX | Anne Arundel, Baltimore, Calvert, Cecil, Harford, Saint Mary's and 1 more | 19 hr |
| Sep 1, 11:03 AM EDT | Mesoscale Discussion | SPC | Anne Arundel, Baltimore, Calvert, Caroline, Carroll, Cecil and 14 more | 2 hr |
| Sep 1, 11:46 AM EDT | Tornado Watch | SPC | Anne Arundel, Baltimore, Calvert, Carroll, Cecil, Charles and 11 more | 9 hr |
| Sep 1, 12:40 PM EDT | Tornado Watch | SPC | Caroline, Kent, Queen Anne's, Talbot | 9 hr |
| Sep 1, 12:52 PM EDT | Areal Flood Warning | LWX | Allegany | 22 hr |
| Sep 1, 1:11 PM EDT | Tornado Warning | LWX | Charles, Prince George's | 34 min |
| Sep 1, 1:23 PM EDT | Tornado Warning | LWX | Charles | 17 min |
| Sep 1, 1:30 PM EDT | Areal Flood Warning | LWX | Carroll, Frederick, Washington | 27 hr |
| Sep 1, 1:31 PM EDT | Tornado Warning | LWX | Charles, Saint Mary's | 29 min |
| Sep 1, 1:32 PM EDT | Mesoscale Discussion | SPC | Anne Arundel, Baltimore, Calvert, Carroll, Cecil, Charles and 9 more | 118 min |
| Sep 1, 1:46 PM EDT | Areal Flood Warning | LWX | Allegany, Garrett | 16 hr |
| Sep 1, 1:56 PM EDT | Tornado Warning | LWX | Anne Arundel, Prince George's | 34 min |
| Sep 1, 2:12 PM EDT | Tornado Warning | LWX | Baltimore | 33 min |
| Sep 1, 2:23 PM EDT | Tornado Warning | LWX | Baltimore | 15 min |
| Sep 1, 2:26 PM EDT | Flash Flood Warning | LWX | Carroll, Frederick | 6 hr |
| Sep 1, 2:26 PM EDT | Tornado Warning | LWX | Baltimore, Harford | 14 min |
| Sep 1, 2:27 PM EDT | Tornado Warning | LWX | Anne Arundel | 15 min |
| Sep 1, 2:40 PM EDT | Severe Thunderstorm Warning | AKQ | Dorchester, Somerset, Wicomico | 50 min |
| Sep 1, 2:48 PM EDT | Tornado Warning | LWX | Baltimore, Harford | 27 min |
| Sep 1, 3:03 PM EDT | Tornado Warning | AKQ | Somerset, Wicomico | 27 min |
| Sep 1, 3:09 PM EDT | Mesoscale Discussion | SPC | Caroline, Cecil, Dorchester, Harford, Kent, Queen Anne's and 2 more | 3 hr |
| Sep 1, 3:10 PM EDT | Tornado Warning | LWX | Baltimore | 16 min |
| Sep 1, 3:16 PM EDT | Severe Thunderstorm Warning | PHI | Caroline, Kent, Queen Anne's, Talbot | 44 min |
| Sep 1, 3:17 PM EDT | Tornado Warning | LWX | Harford | 28 min |
| Sep 1, 3:25 PM EDT | Flash Flood Warning | LWX | Carroll, Frederick | 5 hr |
| Sep 1, 3:34 PM EDT | Flash Flood Warning | LWX | Cecil, Harford | 3 hr |
| Sep 1, 3:36 PM EDT | Wind Advisory | LWX | Allegany, Carroll, Frederick, Washington | 7 hr |
| Sep 1, 3:49 PM EDT | Tornado Warning | LWX | Cecil, Harford | 26 min |
| Sep 1, 3:56 PM EDT | Severe Thunderstorm Warning | AKQ | Dorchester, Somerset, Wicomico | 49 min |
| Sep 1, 4:07 PM EDT | Beach Hazards Statement | AKQ | Worcester | 28 hr |
| Sep 1, 4:07 PM EDT | Coastal Flood Warning | AKQ | Dorchester, Somerset, Wicomico | 12 hr |
| Sep 1, 4:09 PM EDT | Tornado Warning | AKQ | Dorchester | 36 min |
| Sep 1, 4:13 PM EDT | River Flood Watch | LWX | Cecil | 7 hr |
| Sep 1, 4:13 PM EDT | River Flood Warning | LWX | Allegany | 7 hr |
| Sep 1, 4:14 PM EDT | River Flood Warning | LWX | Allegany | 9 hr |
| Sep 1, 4:25 PM EDT | Tornado Warning | AKQ | Dorchester | 35 min |
| Sep 1, 4:37 PM EDT | Areal Flood Warning | LWX | Baltimore, Carroll, Harford | 13 hr |
| Sep 1, 4:58 PM EDT | Tornado Warning | AKQ | Dorchester | 32 min |
| Sep 1, 4:59 PM EDT | Tornado Warning | PHI | Caroline | 46 min |
| Sep 1, 5:01 PM EDT | Tornado Warning | PHI | Caroline, Kent, Queen Anne's | 44 min |
| Sep 1, 5:04 PM EDT | Severe Thunderstorm Warning | AKQ | Dorchester, Wicomico | 41 min |
| Sep 1, 5:16 PM EDT | Severe Thunderstorm Warning | PHI | Caroline, Queen Anne's, Talbot | 44 min |
| Sep 1, 5:36 PM EDT | Tornado Warning | PHI | Kent | 24 min |
| Sep 1, 5:46 PM EDT | Tornado Warning | LWX | Cecil | 29 min |
| Sep 1, 6:08 PM EDT | Areal Flood Warning | LWX | Cecil, Harford | 17 hr |
| Sep 1, 6:12 PM EDT | Tornado Warning | LWX | Cecil | 19 min |
| Sep 1, 6:48 PM EDT | Special Weather Statement | AKQ | Somerset, Wicomico | 42 min |
| Sep 1, 6:53 PM EDT | Severe Thunderstorm Warning | AKQ | Dorchester, Somerset, Wicomico | 52 min |
| Sep 1, 6:57 PM EDT | Severe Thunderstorm Warning | PHI | Caroline | 63 min |
| Sep 1, 7:03 PM EDT | Coastal Flood Warning | LWX | Anne Arundel | 8 hr |
| Sep 1, 7:27 PM EDT | Areal Flood Warning | LWX | Allegany, Washington | 15 hr |
| Sep 1, 7:29 PM EDT | Severe Thunderstorm Warning | AKQ | Somerset, Wicomico, Worcester | 46 min |
| Sep 1, 7:59 PM EDT | Areal Flood Warning | LWX | Carroll, Frederick | 2 hr |
| Sep 1, 8:16 PM EDT | Areal Flood Warning | LWX | Carroll, Frederick | 6 hr |
| Sep 1, 8:45 PM EDT | Areal Flood Advisory | AKQ | Dorchester | 3 hr |
| Sep 2, 12:48 AM EDT | River Flood Warning | LWX | Frederick | 27 hr |
| Sep 2, 12:55 AM EDT | River Flood Watch | LWX | Washington | 4 hr |
| Sep 2, 4:52 AM EDT | River Flood Warning | LWX | Washington | 23 hr |
| Sep 2, 5:01 AM EDT | River Flood Watch | LWX | Cecil | 6 hr |
| Sep 2, 11:05 AM EDT | River Flood Warning | LWX | Cecil, Harford | 22 hr |
| Sep 2, 11:26 AM EDT | River Flood Watch | LWX | Frederick | 33 hr |
| Sep 2, 9:36 PM EDT | River Flood Warning | LWX | Montgomery | 15 hr |
| Sep 3, 3:01 AM EDT | Coastal Flood Advisory | LWX | Harford | 6 hr |
| Sep 5, 3:09 PM EDT | Coastal Flood Statement | AKQ | Dorchester | 13 hr |
| Sep 7, 3:33 PM EDT | Coastal Flood Statement | AKQ | Dorchester | 12 hr |
| Sep 7, 8:07 PM EDT | Beach Hazards Statement | AKQ | Worcester | 4 days |
| Sep 7, 10:46 PM EDT | Coastal Flood Advisory | LWX | Anne Arundel, Baltimore, Harford, City of Baltimore | 12 hr |
| Sep 8, 10:41 AM EDT | Coastal Flood Statement | AKQ | Dorchester | 6 hr |
| Sep 8, 2:28 PM EDT | Coastal Flood Advisory | LWX | Anne Arundel, Baltimore, Harford, City of Baltimore | 11 hr |
| Sep 8, 3:45 PM EDT | Special Weather Statement | AKQ | Somerset, Worcester | 45 min |
| Sep 8, 3:52 PM EDT | Severe Thunderstorm Warning | AKQ | Somerset, Worcester | 30 min |
| Sep 8, 6:11 PM EDT | Flash Flood Watch | LWX | Anne Arundel, Baltimore, Carroll, Cecil, Frederick, Harford and 4 more | 10 hr |
| Sep 8, 7:14 PM EDT | Coastal Flood Advisory | AKQ | Dorchester | 11 hr |
| Sep 8, 8:29 PM EDT | Severe Thunderstorm Watch | SPC | Anne Arundel, Baltimore, Carroll, Cecil, Frederick, Harford and 5 more | 4 hr |
| Sep 8, 9:11 PM EDT | Severe Thunderstorm Warning | LWX | Frederick, Washington | 64 min |
| Sep 8, 9:21 PM EDT | Severe Thunderstorm Warning | LWX | Carroll, Frederick | 54 min |
| Sep 8, 10:18 PM EDT | Areal Flood Warning | LWX | Carroll, Frederick | 3 hr |
| Sep 8, 10:42 PM EDT | Mesoscale Discussion | SPC | Baltimore, Carroll, Cecil, Harford, Howard, Montgomery and 1 more | 2 hr |
| Sep 8, 11:02 PM EDT | Flash Flood Warning | LWX | Frederick | 78 min |
| Sep 8, 11:05 PM EDT | Areal Flood Warning | LWX | Carroll, Frederick | 5 hr |
| Sep 8, 11:57 PM EDT | Areal Flood Warning | LWX | Carroll, Frederick, Howard | 4 hr |
| Sep 9, 12:17 AM EDT | Severe Thunderstorm Warning | LWX | Baltimore, Cecil, Harford | 43 min |
| Sep 9, 3:29 AM EDT | Coastal Flood Advisory | LWX | Anne Arundel | 6 hr |
| Sep 9, 5:37 AM EDT | Areal Flood Advisory | PHI | Caroline, Kent, Queen Anne's, Talbot | 3 hr |
| Sep 9, 8:01 AM EDT | Special Weather Statement | AKQ | Worcester | 44 min |
| Sep 15, 2:54 PM EDT | Coastal Flood Advisory | LWX | Anne Arundel, Baltimore, Harford, City of Baltimore | 13 hr |
| Sep 15, 3:45 PM EDT | Severe Thunderstorm Warning | LWX | Allegany | 16 min |
| Sep 15, 5:15 PM EDT | Severe Thunderstorm Warning | LWX | Washington | 30 min |
| Sep 15, 5:42 PM EDT | Severe Thunderstorm Warning | LWX | Frederick, Washington | 48 min |
| Sep 15, 5:52 PM EDT | Areal Flood Warning | LWX | Washington | 115 min |
| Sep 15, 5:52 PM EDT | Severe Thunderstorm Warning | LWX | Washington | 38 min |
| Sep 15, 6:20 PM EDT | Flash Flood Warning | LWX | Washington | 2 hr |
| Sep 15, 6:23 PM EDT | Severe Thunderstorm Warning | LWX | Frederick, Washington | 52 min |
| Sep 15, 6:28 PM EDT | Severe Thunderstorm Warning | LWX | Frederick, Washington | 34 min |
| Sep 15, 6:35 PM EDT | Areal Flood Warning | LWX | Frederick, Washington | 113 min |
| Sep 15, 7:22 PM EDT | Flash Flood Warning | LWX | Frederick, Washington | 64 min |
| Sep 15, 8:24 PM EDT | Areal Flood Warning | LWX | Frederick, Washington | 2 hr |
| Sep 15, 9:38 PM EDT | Severe Thunderstorm Warning | LWX | Baltimore, Cecil, Harford | 52 min |
| Sep 15, 10:57 PM EDT | Special Weather Statement | PHI | Kent | 48 min |
| Sep 16, 2:44 PM EDT | Flash Flood Watch | LWX | Anne Arundel, Baltimore, Carroll, Frederick, Harford, Howard and 3 more | 6 hr |
| Sep 16, 3:19 PM EDT | Areal Flood Advisory | PHI | Kent | 3 hr |
| Sep 16, 3:21 PM EDT | Areal Flood Warning | LWX | Montgomery, Prince George's | 6 hr |
| Sep 16, 4:19 PM EDT | Beach Hazards Statement | AKQ | Worcester | 51 hr |
| Sep 16, 5:36 PM EDT | Areal Flood Warning | LWX | Carroll, Frederick, Howard, Montgomery | 6 hr |
| Sep 16, 6:00 PM EDT | Areal Flood Warning | LWX | Baltimore, City of Baltimore | 4 hr |
| Sep 16, 7:07 PM EDT | Areal Flood Warning | LWX | Carroll, Frederick | 6 hr |
| Sep 19, 2:54 AM EDT | Coastal Flood Advisory | LWX | Anne Arundel | 3 hr |
| Sep 21, 3:04 AM EDT | Flash Flood Watch | LWX | Allegany, Baltimore, Carroll, Cecil, Frederick, Harford and 4 more | 57 hr |
| Sep 21, 3:11 AM EDT | Coastal Flood Advisory | LWX | Anne Arundel, Saint Mary's | 20 hr |
| Sep 21, 11:50 AM EDT | Coastal Flood Statement | AKQ | Dorchester | 5 hr |
| Sep 21, 4:53 PM EDT | Beach Hazards Statement | AKQ | Worcester | 51 hr |
| Sep 22, 1:15 AM EDT | Coastal Flood Advisory | LWX | Saint Mary's | 4 hr |
| Sep 22, 3:14 AM EDT | Coastal Flood Watch | LWX | Anne Arundel | 6 hr |
| Sep 22, 3:14 AM EDT | Coastal Flood Advisory | LWX | Anne Arundel, Baltimore, Calvert, Cecil, Charles, Harford and 2 more | 46 hr |
| Sep 22, 6:36 AM EDT | Coastal Flood Statement | AKQ | Dorchester | 4 hr |
| Sep 22, 9:39 AM EDT | Coastal Flood Warning | LWX | Anne Arundel, Saint Mary's | 34 hr |
| Sep 22, 10:39 AM EDT | Coastal Flood Statement | AKQ | Somerset, Wicomico | 18 hr |
| Sep 22, 10:39 AM EDT | Coastal Flood Advisory | AKQ | Dorchester, Somerset, Wicomico | 35 hr |
| Sep 22, 4:22 PM EDT | Severe Thunderstorm Warning | LWX | Charles, Prince George's, Saint Mary's | 38 min |
| Sep 22, 5:01 PM EDT | Coastal Flood Advisory | PHI | Caroline, Kent, Queen Anne's, Talbot | 22 hr |
| Sep 22, 5:39 PM EDT | Severe Thunderstorm Warning | LWX | Anne Arundel, Baltimore, Carroll, Howard, Montgomery, Prince George's | 51 min |
| Sep 22, 6:14 PM EDT | Mesoscale Discussion | SPC | Anne Arundel, Baltimore, Calvert, Caroline, Cecil, Dorchester and 9 more | 2 hr |
| Sep 22, 6:20 PM EDT | Severe Thunderstorm Warning | LWX | Baltimore, Carroll | 25 min |
| Sep 23, 12:25 AM EDT | Coastal Flood Advisory | LWX | Charles | 8 hr |
| Sep 23, 2:02 AM EDT | Areal Flood Warning | LWX | Frederick, Washington | 10 hr |
| Sep 23, 2:34 AM EDT | Flash Flood Warning | LWX | Frederick, Washington | 3 hr |
| Sep 23, 3:13 AM EDT | Mesoscale Discussion | SPC | Anne Arundel, Baltimore, Calvert, Caroline, Carroll, Cecil and 14 more | 5 hr |
| Sep 23, 3:47 AM EDT | Areal Flood Warning | LWX | Montgomery | 12 hr |
| Sep 23, 3:53 AM EDT | Areal Flood Warning | LWX | Carroll, Frederick | 17 hr |
| Sep 23, 4:17 AM EDT | Flash Flood Warning | LWX | Frederick | 3 hr |
| Sep 23, 4:41 AM EDT | Areal Flood Warning | LWX | Howard, Montgomery | 9 hr |
| Sep 23, 5:35 AM EDT | Areal Flood Warning | LWX | Carroll, Frederick | 6 hr |
| Sep 23, 7:08 AM EDT | River Flood Warning | LWX | Montgomery | 16 hr |
| Sep 23, 7:56 AM EDT | Severe Thunderstorm Warning | LWX | Baltimore, Harford | 22 min |
| Sep 23, 8:04 AM EDT | Areal Flood Warning | LWX | Anne Arundel, Baltimore, Harford, Howard, Montgomery, Prince George's and 1 more | 10 hr |
| Sep 23, 8:08 AM EDT | Special Weather Statement | PHI | Kent, Queen Anne's, Talbot | 52 min |
| Sep 23, 9:02 AM EDT | Areal Flood Warning | LWX | Cecil | 9 hr |
| Sep 23, 9:03 AM EDT | Areal Flood Advisory | PHI | Kent, Queen Anne's, Talbot | 3 hr |
| Sep 23, 9:04 AM EDT | Special Weather Statement | AKQ | Dorchester | 41 min |
| Sep 23, 9:23 AM EDT | Areal Flood Advisory | AKQ | Dorchester | 3 hr |
| Sep 23, 9:27 AM EDT | Severe Thunderstorm Warning | LWX | Cecil, Harford | 78 min |
| Sep 23, 9:31 AM EDT | Special Weather Statement | PHI | Kent, Queen Anne's, Talbot | 59 min |
| Sep 23, 9:46 AM EDT | Severe Thunderstorm Warning | PHI | Caroline, Kent, Queen Anne's, Talbot | 44 min |
| Sep 23, 9:49 AM EDT | Flash Flood Warning | PHI | Kent, Queen Anne's, Talbot | 4 hr |
| Sep 23, 9:52 AM EDT | Special Weather Statement | AKQ | Dorchester | 53 min |
| Sep 23, 10:30 AM EDT | Mesoscale Discussion | SPC | Caroline, Cecil, Wicomico | 2 hr |
| Sep 23, 10:35 AM EDT | Severe Thunderstorm Warning | PHI | Caroline, Kent, Queen Anne's | 40 min |
| Sep 23, 10:55 AM EDT | Areal Flood Advisory | PHI | Caroline, Kent, Queen Anne's, Talbot | 3 hr |
| Sep 23, 12:11 PM EDT | Areal Flood Warning | LWX | Frederick | 5 hr |
| Sep 23, 1:18 PM EDT | River Flood Warning | LWX | Frederick | 25 hr |
| Sep 23, 2:15 PM EDT | Coastal Flood Advisory | LWX | Charles | 6 hr |
| Sep 24, 9:55 PM EDT | Coastal Flood Advisory | LWX | Harford | 5 hr |
| Sep 28, 10:12 AM EDT | Areal Flood Warning | LWX | Garrett | 97 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.
- Frederick County37
- Harford County34
- Baltimore County33
- Anne Arundel County31
- Carroll County28
- Cecil County28
- Montgomery County26
- Dorchester County24
- Washington County22
- City of Baltimore22
- Kent County21
- Prince George's County19
- Queen Anne's County19
- Howard County18
- Caroline County16
- Talbot County16
- Wicomico County16
- Somerset County15
- Charles County13
- Saint Mary's County12
- Worcester County10
- Allegany County9
- Calvert County8
- Garrett County3
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.