Alert archive / Maryland / 2020
Weather alerts in Maryland, September 2020
115 weather alerts in September 2020, 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 2020. Tap one for its archive.
- Alerts
- 115
- Warnings
- 48
- Watches
- 5
- Advisories
- 34
- Busiest day
- September 3, 202031 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 |
|---|---|---|---|---|
| Sep 2, 3:37 PM EDT | Mesoscale Discussion | SPC | Anne Arundel, Baltimore, Calvert, Carroll, Cecil, Charles and 9 more | 53 min |
| Sep 2, 6:17 PM EDT | Severe Thunderstorm Warning | LWX | Carroll, Frederick, Washington | 43 min |
| Sep 2, 6:32 PM EDT | Severe Thunderstorm Warning | LWX | Frederick, Washington | 43 min |
| Sep 2, 6:43 PM EDT | Severe Thunderstorm Watch | SPC | Anne Arundel, Baltimore, Calvert, Caroline, Carroll, Cecil and 10 more | 5 hr |
| Sep 2, 6:54 PM EDT | Severe Thunderstorm Warning | LWX | Carroll, Frederick | 51 min |
| Sep 2, 7:06 PM EDT | Severe Thunderstorm Warning | LWX | Frederick, Howard, Montgomery | 39 min |
| Sep 2, 7:36 PM EDT | Severe Thunderstorm Warning | LWX | Baltimore, Carroll, Harford, Howard | 39 min |
| Sep 2, 7:38 PM EDT | Severe Thunderstorm Warning | LWX | Howard, Montgomery | 33 min |
| Sep 2, 8:02 PM EDT | Severe Thunderstorm Warning | LWX | Harford | 43 min |
| Sep 2, 8:07 PM EDT | Severe Thunderstorm Warning | PHI | Cecil | 53 min |
| Sep 2, 8:20 PM EDT | Mesoscale Discussion | SPC | Anne Arundel, Baltimore, Caroline, Cecil, Harford, Howard and 6 more | 115 min |
| Sep 2, 8:45 PM EDT | Severe Thunderstorm Warning | LWX | Anne Arundel | 9 min |
| Sep 2, 8:47 PM EDT | Severe Thunderstorm Warning | PHI | Caroline, Cecil, Kent, Queen Anne's, Talbot | 58 min |
| Sep 2, 10:08 PM EDT | Severe Thunderstorm Warning | PHI | Caroline, Queen Anne's, Talbot | 67 min |
| Sep 2, 11:09 PM EDT | Special Weather Statement | AKQ | Caroline | 36 min |
| Sep 3, 3:06 PM EDT | Mesoscale Discussion | SPC | Allegany, Anne Arundel, Baltimore, Calvert, Caroline, Carroll and 17 more | 114 min |
| Sep 3, 3:30 PM EDT | Severe Thunderstorm Warning | LWX | Frederick, Washington | 45 min |
| Sep 3, 3:41 PM EDT | Severe Thunderstorm Warning | LWX | Carroll, Frederick, Howard, Montgomery | 49 min |
| Sep 3, 3:42 PM EDT | Tornado Watch | SPC | Anne Arundel, Baltimore, Calvert, Caroline, Carroll, Cecil and 16 more | 6 hr |
| Sep 3, 3:43 PM EDT | Tornado Warning | LWX | Carroll, Frederick, Howard | 19 min |
| Sep 3, 4:07 PM EDT | Severe Thunderstorm Warning | LWX | Montgomery | 38 min |
| Sep 3, 4:31 PM EDT | Severe Thunderstorm Warning | LWX | Baltimore, Carroll, Howard, City of Baltimore | 44 min |
| Sep 3, 4:36 PM EDT | Severe Thunderstorm Warning | LWX | Howard, Montgomery, Prince George's | 54 min |
| Sep 3, 4:36 PM EDT | Tornado Warning | LWX | Baltimore, Carroll, Howard, City of Baltimore | 24 min |
| Sep 3, 4:43 PM EDT | Tornado Warning | LWX | Howard, Montgomery, Prince George's | 32 min |
| Sep 3, 5:05 PM EDT | Tornado Warning | LWX | Baltimore, Harford, City of Baltimore | 40 min |
| Sep 3, 5:10 PM EDT | Tornado Warning | LWX | Montgomery, Prince George's | 35 min |
| Sep 3, 5:14 PM EDT | Areal Flood Warning | LWX | Montgomery, Prince George's | 6 hr |
| Sep 3, 5:16 PM EDT | Severe Thunderstorm Warning | LWX | Anne Arundel, Prince George's | 59 min |
| Sep 3, 5:27 PM EDT | Severe Thunderstorm Warning | LWX | Anne Arundel, Calvert, Montgomery, Prince George's | 63 min |
| Sep 3, 5:29 PM EDT | Flash Flood Warning | LWX | Montgomery, Prince George's | 3 hr |
| Sep 3, 5:33 PM EDT | Areal Flood Warning | LWX | Baltimore, Carroll, Harford, Howard, City of Baltimore | 3 hr |
| Sep 3, 5:47 PM EDT | Severe Thunderstorm Warning | PHI | Caroline, Kent, Queen Anne's, Talbot | 73 min |
| Sep 3, 5:55 PM EDT | Tornado Warning | LWX | Anne Arundel | 14 min |
| Sep 3, 6:18 PM EDT | Mesoscale Discussion | SPC | Anne Arundel, Caroline, Queen Anne's, Talbot | 117 min |
| Sep 3, 6:42 PM EDT | Special Weather Statement | AKQ | Dorchester | 63 min |
| Sep 3, 6:48 PM EDT | Severe Thunderstorm Warning | PHI | Caroline, Talbot | 57 min |
| Sep 3, 7:10 PM EDT | Areal Flood Warning | LWX | Prince George's | 2 hr |
| Sep 3, 7:41 PM EDT | Areal Flood Warning | LWX | Anne Arundel, Prince George's | 6 hr |
| Sep 3, 9:24 PM EDT | Special Weather Statement | AKQ | Dorchester | 66 min |
| Sep 3, 11:07 PM EDT | Areal Flood Warning | LWX | Montgomery, Prince George's | 25 min |
| Sep 4, 12:46 AM EDT | Special Weather Statement | AKQ | Worcester | 44 min |
| Sep 4, 12:59 AM EDT | Special Weather Statement | PHI | Caroline | 46 min |
| Sep 4, 1:28 PM EDT | Areal Flood Warning | LWX | Prince George's | 6 hr |
| Sep 4, 7:43 PM EDT | Special Weather Statement | AKQ | Dorchester | 47 min |
| Sep 4, 8:29 PM EDT | Special Weather Statement | AKQ | Wicomico | 46 min |
| Sep 4, 9:38 PM EDT | Special Weather Statement | AKQ | Worcester | 52 min |
| Sep 8, 9:41 PM EDT | Beach Hazards Statement | AKQ | Worcester | 46 hr |
| Sep 9, 2:15 PM EDT | Flash Flood Watch | LWX | Anne Arundel, Baltimore, Calvert, Carroll, Charles, Harford and 5 more | 30 hr |
| Sep 9, 2:26 PM EDT | Flash Flood Watch | AKQ | Dorchester, Somerset, Wicomico, Worcester | 31 hr |
| Sep 9, 5:08 PM EDT | Flash Flood Watch | PHI | Caroline, Cecil, Kent, Queen Anne's, Talbot | 29 hr |
| Sep 10, 4:35 AM EDT | Flash Flood Warning | LWX | Saint Mary's | 4 hr |
| Sep 10, 5:46 AM EDT | Special Weather Statement | AKQ | Worcester | 59 min |
| Sep 10, 6:15 AM EDT | Special Weather Statement | AKQ | Dorchester | 45 min |
| Sep 10, 6:33 AM EDT | Flash Flood Warning | LWX | Charles | 2 hr |
| Sep 10, 8:09 AM EDT | Areal Flood Advisory | AKQ | Dorchester | 3 hr |
| Sep 10, 8:21 AM EDT | Areal Flood Warning | LWX | Charles, Saint Mary's | 7 hr |
| Sep 10, 8:35 AM EDT | Areal Flood Warning | LWX | Saint Mary's | 8 hr |
| Sep 10, 12:41 PM EDT | Flash Flood Warning | LWX | Montgomery | 4 hr |
| Sep 10, 1:28 PM EDT | Flash Flood Warning | LWX | Montgomery, Prince George's | 3 hr |
| Sep 10, 2:01 PM EDT | Areal Flood Warning | LWX | Charles | 3 hr |
| Sep 10, 2:34 PM EDT | Flash Flood Warning | LWX | Prince George's | 2 hr |
| Sep 10, 3:47 PM EDT | Flash Flood Warning | LWX | Charles, Saint Mary's | 3 hr |
| Sep 10, 4:14 PM EDT | Areal Flood Warning | LWX | Montgomery, Prince George's | 9 hr |
| Sep 10, 4:33 PM EDT | Areal Flood Warning | LWX | Calvert, Charles, Prince George's | 5 hr |
| Sep 10, 4:37 PM EDT | Areal Flood Warning | LWX | Prince George's | 4 hr |
| Sep 10, 6:37 PM EDT | Areal Flood Warning | LWX | Charles, Saint Mary's | 4 hr |
| Sep 11, 1:58 AM EDT | Areal Flood Warning | LWX | Prince George's | 9 hr |
| Sep 12, 12:28 PM EDT | Coastal Flood Advisory | LWX | Anne Arundel | 6 hr |
| Sep 12, 6:37 PM EDT | Coastal Flood Advisory | LWX | Anne Arundel, Baltimore, Calvert, Charles, Saint Mary's, City of Baltimore | 12 hr |
| Sep 12, 6:51 PM EDT | Beach Hazards Statement | AKQ | Worcester | 4 days |
| Sep 12, 7:33 PM EDT | Coastal Flood Advisory | AKQ | Dorchester, Somerset, Wicomico | 7 hr |
| Sep 13, 3:54 AM EDT | Coastal Flood Statement | AKQ | Dorchester, Somerset, Wicomico | 8 hr |
| Sep 13, 8:35 AM EDT | Coastal Flood Advisory | LWX | Saint Mary's | 5 hr |
| Sep 13, 2:54 PM EDT | Coastal Flood Statement | AKQ | Dorchester, Somerset, Wicomico | 13 hr |
| Sep 13, 10:36 PM EDT | Coastal Flood Advisory | LWX | Anne Arundel | 8 hr |
| Sep 16, 2:29 AM EDT | Coastal Flood Advisory | LWX | Anne Arundel | 4 hr |
| Sep 16, 9:55 PM EDT | Coastal Flood Statement | AKQ | Dorchester | 6 hr |
| Sep 17, 2:25 AM EDT | Coastal Flood Advisory | LWX | Anne Arundel | 4 hr |
| Sep 17, 3:52 PM EDT | Beach Hazards Statement | AKQ | Worcester | 52 hr |
| Sep 17, 3:52 PM EDT | Coastal Flood Advisory | AKQ | Dorchester, Somerset, Wicomico, Worcester | 5 days |
| Sep 17, 3:52 PM EDT | High Surf Advisory | AKQ | Worcester | 6 days |
| Sep 18, 9:12 AM EDT | Frost Advisory | PBZ | 24 hr | |
| Sep 19, 1:17 PM EDT | Frost Advisory | PBZ | 20 hr | |
| Sep 19, 1:37 PM EDT | Frost Advisory | LWX | Allegany, Washington | 20 hr |
| Sep 19, 9:07 PM EDT | Beach Hazards Statement | AKQ | Worcester | 4 days |
| Sep 20, 12:12 PM EDT | Frost Advisory | PBZ | 21 hr | |
| Sep 20, 1:43 PM EDT | Frost Advisory | LWX | Allegany, Carroll, Frederick, Washington | 19 hr |
| Sep 20, 3:58 PM EDT | Coastal Flood Advisory | LWX | Saint Mary's | 3 hr |
| Sep 20, 8:55 PM EDT | Freeze Warning | LWX | Allegany | 5 hr |
| Sep 21, 2:15 AM EDT | Coastal Flood Advisory | LWX | Saint Mary's | 4 hr |
| Sep 21, 5:27 AM EDT | Coastal Flood Advisory | AKQ | Dorchester, Somerset, Wicomico, Worcester | 17 hr |
| Sep 21, 1:28 PM EDT | Coastal Flood Advisory | LWX | Anne Arundel, Baltimore, Charles, Harford, Saint Mary's, City of Baltimore | 20 hr |
| Sep 21, 1:31 PM EDT | Frost Advisory | LWX | Allegany, Baltimore, Carroll, Frederick, Harford, Howard and 2 more | 19 hr |
| Sep 21, 3:35 PM EDT | Frost Advisory | PBZ | 17 hr | |
| Sep 22, 5:17 AM EDT | Coastal Flood Statement | AKQ | Worcester | 13 hr |
| Sep 22, 5:17 AM EDT | Coastal Flood Advisory | AKQ | Dorchester, Somerset, Wicomico | 18 hr |
| Sep 22, 1:39 PM EDT | Coastal Flood Advisory | LWX | Anne Arundel, Saint Mary's | 11 hr |
| Sep 23, 5:12 AM EDT | Coastal Flood Statement | AKQ | Worcester | 13 hr |
| Sep 23, 7:15 PM EDT | Coastal Flood Advisory | LWX | Anne Arundel, Baltimore, Harford, City of Baltimore | 10 hr |
| Sep 24, 6:39 AM EDT | Coastal Flood Advisory | LWX | Anne Arundel, Saint Mary's | 6 hr |
| Sep 25, 8:01 AM EDT | Dense Fog Advisory | PHI | Caroline, Cecil, Kent, Queen Anne's, Talbot | 119 min |
| Sep 26, 10:54 AM EDT | Special Weather Statement | AKQ | Wicomico | 51 min |
| Sep 26, 12:04 PM EDT | Areal Flood Advisory | AKQ | Wicomico | 116 min |
| Sep 26, 12:44 PM EDT | Areal Flood Advisory | AKQ | Dorchester | 2 hr |
| Sep 26, 11:55 PM EDT | Dense Fog Advisory | LWX | Allegany, Anne Arundel, Calvert, Saint Mary's | 10 hr |
| Sep 27, 10:10 AM EDT | Dense Fog Advisory | LWX | Allegany | 50 min |
| Sep 29, 12:42 AM EDT | Coastal Flood Advisory | LWX | Anne Arundel | 8 hr |
| Sep 29, 10:52 AM EDT | Special Weather Statement | AKQ | Wicomico | 38 min |
| Sep 29, 11:35 AM EDT | Special Weather Statement | AKQ | Somerset, Wicomico | 55 min |
| Sep 29, 4:02 PM EDT | Coastal Flood Statement | AKQ | Dorchester, Somerset, Wicomico | 13 hr |
| Sep 29, 8:04 PM EDT | Areal Flood Advisory | PHI | Cecil, Kent, Queen Anne's | 105 min |
| Sep 30, 12:12 AM EDT | Areal Flood Advisory | PHI | Caroline, Cecil, Kent, Queen Anne's, Talbot | 4 hr |
| Sep 30, 12:20 AM EDT | Areal Flood Advisory | AKQ | Dorchester, Somerset, Wicomico | 3 hr |
| Sep 30, 1:04 AM EDT | Special Weather Statement | AKQ | Worcester | 41 min |
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 | 20 |
| Tornado Warning | 6 |
| Severe Thunderstorm Watch | 1 |
| Tornado Watch | 1 |
| Mesoscale Discussion | 4 |
| Special Weather Statement | 14 |
| Flooding | |
| Areal Flood Warning | 14 |
| Flash Flood Warning | 7 |
| Flash Flood Watch | 3 |
| Areal Flood Advisory | 6 |
| Cold | |
| Freeze Warning | 1 |
| Frost Advisory | 7 |
| Fog and smoke | |
| Dense Fog Advisory | 3 |
| Coast and beach | |
| Coastal Flood Advisory | 17 |
| High Surf Advisory | 1 |
| Beach Hazards Statement | 4 |
| Coastal Flood Statement | 6 |
By county
Every county with at least one alert. A county page lists each alert that covered it.
- Anne Arundel County23
- Prince George's County23
- Montgomery County21
- Dorchester County18
- Howard County17
- Saint Mary's County16
- Wicomico County16
- Worcester County16
- Baltimore County15
- Carroll County15
- Caroline County14
- Charles County13
- Frederick County13
- Harford County13
- Queen Anne's County13
- Talbot County13
- City of Baltimore13
- Somerset County12
- Cecil County11
- Kent County11
- Calvert County9
- Washington County8
- Allegany County7
Nearby
Alerts in force nowTornadoes on recordThe radar archive20192021
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.