Alert archive / Maryland / Severe Thunderstorm Warnings
Severe Thunderstorm Warnings in Maryland, 2023
298 severe thunderstorm warnings in 2023. An alert counts here when it covered any part of the state, so the counties below add up to more than the state. The archive of severe thunderstorm warnings reaches back to 1986.
Severe Thunderstorm Warnings by county
Each county as a circle sized by its count in 2023. Tap one for its archive.
- Severe Thunderstorm Warnings
- 298
- Busiest month
- July106 severe thunderstorm warnings
- Busiest day
- July 29, 202332 severe thunderstorm warnings
Over time
By month
Warning verification
How often warnings here had a storm report inside them, and how much warning the reports had.
216 of 298 severe thunderstorm warnings covering Maryland in 2023 had a qualifying storm report inside them; 518 of 579 hail, wind and damage reports fell inside a warning, on average 24 minutes after it went out.
Maryland, 2023
| Warnings | With a report | False alarm ratio | Reports | Inside a warning | Mean lead time | |
|---|---|---|---|---|---|---|
| Severe thunderstorm warnings | 298 | 216 | 28% | 579 | 89% | 24 min |
Each office's whole area, 2023
| Warnings | With a report | False alarm ratio | Reports | Inside a warning | Mean lead time | |
|---|---|---|---|---|---|---|
| NWS Philadelphia/Mount Holly: severe thunderstorm warnings | 364 | 198 | 46% | 662 | 84% | 22 min |
| NWS Wakefield, VA: severe thunderstorm warnings | 244 | 165 | 32% | 383 | 89% | 21 min |
| NWS Baltimore/Washington: severe thunderstorm warnings | 370 | 286 | 23% | 992 | 89% | 21 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 | Counties | Lasted |
|---|---|---|---|---|
| Feb 21, 1:35 PM EST | Severe Thunderstorm Warning | LWX | Baltimore, Carroll, Harford, Howard, City of Baltimore | 16 min |
| Mar 23, 10:54 PM EDT | Severe Thunderstorm Warning | LWX | Washington | 36 min |
| Mar 23, 11:24 PM EDT | Severe Thunderstorm Warning | LWX | Frederick, Montgomery, Washington | 36 min |
| Apr 1, 5:13 PM EDT | Severe Thunderstorm Warning | PHI | Caroline, Queen Anne's, Talbot | 32 min |
| Apr 1, 5:34 PM EDT | Severe Thunderstorm Warning | PHI | Kent, Queen Anne's | 26 min |
| Apr 1, 5:38 PM EDT | Severe Thunderstorm Warning | PHI | Caroline, Talbot | 37 min |
| Apr 1, 5:56 PM EDT | Severe Thunderstorm Warning | LWX | Baltimore, Carroll, Harford | 49 min |
| Apr 1, 6:00 PM EDT | Severe Thunderstorm Warning | LWX | Baltimore, Carroll, Frederick, Harford, Howard, Montgomery | 45 min |
| Apr 1, 6:27 PM EDT | Severe Thunderstorm Warning | LWX | Baltimore, Cecil, Harford | 48 min |
| Apr 1, 6:58 PM EDT | Severe Thunderstorm Warning | PHI | Caroline, Kent, Queen Anne's | 47 min |
| Apr 1, 7:01 PM EDT | Severe Thunderstorm Warning | LWX | Cecil | 29 min |
| Apr 1, 7:20 PM EDT | Severe Thunderstorm Warning | PHI | Caroline, Kent, Queen Anne's, Talbot | 40 min |
| Apr 1, 7:36 PM EDT | Severe Thunderstorm Warning | PHI | Caroline, Queen Anne's, Talbot | 39 min |
| Apr 1, 7:40 PM EDT | Severe Thunderstorm Warning | LWX | Calvert, Saint Mary's | 35 min |
| Apr 1, 7:50 PM EDT | Severe Thunderstorm Warning | PHI | Caroline, Queen Anne's, Talbot | 40 min |
| Apr 1, 7:51 PM EDT | Severe Thunderstorm Warning | LWX | Saint Mary's | 39 min |
| Apr 1, 7:54 PM EDT | Severe Thunderstorm Warning | AKQ | Dorchester, Somerset, Wicomico | 51 min |
| Apr 1, 8:21 PM EDT | Severe Thunderstorm Warning | AKQ | Somerset, Wicomico, Worcester | 54 min |
| Apr 1, 8:24 PM EDT | Severe Thunderstorm Warning | AKQ | Somerset | 48 min |
| Apr 1, 8:45 PM EDT | Severe Thunderstorm Warning | AKQ | Somerset, Worcester | 60 min |
| Apr 6, 5:23 PM EDT | Severe Thunderstorm Warning | LWX | Charles, Saint Mary's | 52 min |
| Apr 6, 5:31 PM EDT | Severe Thunderstorm Warning | LWX | Charles, Saint Mary's | 32 min |
| Apr 6, 5:53 PM EDT | Severe Thunderstorm Warning | LWX | Calvert, Charles, Prince George's, Saint Mary's | 35 min |
| Apr 6, 6:02 PM EDT | Severe Thunderstorm Warning | LWX | Saint Mary's | 43 min |
| Apr 6, 6:18 PM EDT | Severe Thunderstorm Warning | LWX | Montgomery, Prince George's | 42 min |
| Apr 6, 6:24 PM EDT | Severe Thunderstorm Warning | PHI | Queen Anne's, Talbot | 31 min |
| Apr 6, 6:47 PM EDT | Severe Thunderstorm Warning | PHI | Kent, Queen Anne's, Talbot | 28 min |
| Apr 6, 6:48 PM EDT | Severe Thunderstorm Warning | AKQ | Dorchester, Somerset, Wicomico | 57 min |
| Apr 6, 7:07 PM EDT | Severe Thunderstorm Warning | LWX | Saint Mary's | 23 min |
| Apr 6, 7:09 PM EDT | Severe Thunderstorm Warning | PHI | Caroline, Kent, Queen Anne's, Talbot | 26 min |
| Apr 6, 7:41 PM EDT | Severe Thunderstorm Warning | AKQ | Somerset, Wicomico, Worcester | 49 min |
| Apr 6, 7:50 PM EDT | Severe Thunderstorm Warning | PHI | Caroline, Queen Anne's, Talbot | 40 min |
| Apr 15, 11:47 AM EDT | Severe Thunderstorm Warning | LWX | Carroll | 43 min |
| Apr 15, 12:10 PM EDT | Severe Thunderstorm Warning | LWX | Carroll, Frederick | 50 min |
| Apr 15, 12:54 PM EDT | Severe Thunderstorm Warning | LWX | Carroll, Frederick | 22 min |
| Apr 15, 1:30 PM EDT | Severe Thunderstorm Warning | LWX | Baltimore | 32 min |
| Apr 15, 2:13 PM EDT | Severe Thunderstorm Warning | LWX | Baltimore, City of Baltimore | 24 min |
| Apr 15, 2:25 PM EDT | Severe Thunderstorm Warning | LWX | Baltimore, Harford | 22 min |
| Apr 15, 3:34 PM EDT | Severe Thunderstorm Warning | LWX | Anne Arundel | 15 min |
| Apr 15, 3:54 PM EDT | Severe Thunderstorm Warning | LWX | Anne Arundel, Prince George's | 23 min |
| Apr 22, 1:20 PM EDT | Severe Thunderstorm Warning | LWX | Frederick, Montgomery | 40 min |
| Apr 22, 2:02 PM EDT | Severe Thunderstorm Warning | LWX | Baltimore, Carroll, Frederick, Howard, Montgomery | 43 min |
| Apr 22, 2:14 PM EDT | Severe Thunderstorm Warning | LWX | Anne Arundel, Calvert, Charles, Prince George's | 46 min |
| Apr 22, 2:47 PM EDT | Severe Thunderstorm Warning | LWX | Anne Arundel, Baltimore, Harford, Howard, City of Baltimore | 43 min |
| Apr 22, 5:20 PM EDT | Severe Thunderstorm Warning | AKQ | Dorchester, Somerset, Wicomico, Worcester | 40 min |
| Apr 22, 5:23 PM EDT | Severe Thunderstorm Warning | PHI | Caroline | 52 min |
| Jun 2, 6:23 PM EDT | Severe Thunderstorm Warning | PHI | Kent | 67 min |
| Jun 3, 1:05 PM EDT | Severe Thunderstorm Warning | LWX | Garrett | 40 min |
| Jun 3, 6:40 PM EDT | Severe Thunderstorm Warning | LWX | Garrett | 50 min |
| Jun 3, 7:19 PM EDT | Severe Thunderstorm Warning | LWX | Garrett | 16 min |
| Jun 8, 11:36 AM EDT | Severe Thunderstorm Warning | AKQ | Dorchester, Wicomico | 39 min |
| Jun 8, 11:44 AM EDT | Severe Thunderstorm Warning | AKQ | Dorchester, Wicomico | 31 min |
| Jun 16, 10:36 AM EDT | Severe Thunderstorm Warning | LWX | Cecil, Harford | 39 min |
| Jun 16, 11:40 AM EDT | Severe Thunderstorm Warning | PHI | Caroline | 50 min |
| Jun 16, 5:24 PM EDT | Severe Thunderstorm Warning | AKQ | Wicomico, Worcester | 51 min |
| Jun 16, 5:55 PM EDT | Severe Thunderstorm Warning | LWX | Charles, Prince George's | 50 min |
| Jun 16, 6:29 PM EDT | Severe Thunderstorm Warning | LWX | Charles, Saint Mary's | 46 min |
| Jun 16, 7:02 PM EDT | Severe Thunderstorm Warning | LWX | Calvert, Charles, Saint Mary's | 43 min |
| Jun 19, 4:56 PM EDT | Severe Thunderstorm Warning | LWX | Frederick, Montgomery | 33 min |
| Jun 26, 2:29 PM EDT | Severe Thunderstorm Warning | LWX | Allegany | 46 min |
| Jun 26, 3:06 PM EDT | Severe Thunderstorm Warning | LWX | Allegany | 15 min |
| Jun 26, 4:59 PM EDT | Severe Thunderstorm Warning | LWX | Allegany | 12 min |
| Jun 26, 5:28 PM EDT | Severe Thunderstorm Warning | LWX | Washington | 43 min |
| Jun 26, 6:08 PM EDT | Severe Thunderstorm Warning | LWX | Baltimore, City of Baltimore | 52 min |
| Jun 26, 6:27 PM EDT | Severe Thunderstorm Warning | LWX | Carroll, Frederick | 48 min |
| Jun 26, 6:35 PM EDT | Severe Thunderstorm Warning | LWX | Baltimore, Harford | 40 min |
| Jun 26, 7:04 PM EDT | Severe Thunderstorm Warning | LWX | Baltimore, Harford | 14 min |
| Jun 26, 7:06 PM EDT | Severe Thunderstorm Warning | LWX | Baltimore, Harford | 39 min |
| Jun 26, 8:49 PM EDT | Severe Thunderstorm Warning | LWX | Baltimore, Harford | 41 min |
| Jun 26, 11:29 PM EDT | Severe Thunderstorm Warning | AKQ | Somerset | 31 min |
| Jun 26, 11:53 PM EDT | Severe Thunderstorm Warning | AKQ | Somerset, Worcester | 52 min |
| Jun 27, 1:54 PM EDT | Severe Thunderstorm Warning | LWX | Cecil, Harford | 51 min |
| Jun 27, 2:11 PM EDT | Severe Thunderstorm Warning | LWX | Montgomery, Prince George's | 49 min |
| Jun 27, 3:02 PM EDT | Severe Thunderstorm Warning | LWX | Anne Arundel, Prince George's | 43 min |
| Jun 27, 3:19 PM EDT | Severe Thunderstorm Warning | LWX | Anne Arundel, Prince George's | 41 min |
| Jun 27, 3:30 PM EDT | Severe Thunderstorm Warning | LWX | Baltimore, Harford, City of Baltimore | 45 min |
| Jun 27, 3:41 PM EDT | Severe Thunderstorm Warning | LWX | Anne Arundel, Prince George's | 64 min |
| Jun 27, 3:41 PM EDT | Severe Thunderstorm Warning | LWX | Charles, Prince George's | 24 min |
| Jun 27, 3:52 PM EDT | Severe Thunderstorm Warning | LWX | Anne Arundel, Baltimore, Harford, Howard, City of Baltimore | 38 min |
| Jun 27, 4:24 PM EDT | Severe Thunderstorm Warning | PHI | Kent, Queen Anne's, Talbot | 51 min |
| Jun 27, 5:08 PM EDT | Severe Thunderstorm Warning | PHI | Caroline, Queen Anne's, Talbot | 37 min |
| Jun 27, 5:08 PM EDT | Severe Thunderstorm Warning | PHI | Caroline, Queen Anne's, Talbot | 35 min |
| Jun 27, 5:29 PM EDT | Severe Thunderstorm Warning | PHI | Caroline, Talbot | 46 min |
| Jun 30, 4:41 PM EDT | Severe Thunderstorm Warning | LWX | Anne Arundel, Baltimore, Howard, City of Baltimore | 24 min |
| Jul 1, 3:40 PM EDT | Severe Thunderstorm Warning | LWX | Charles | 50 min |
| Jul 1, 4:17 PM EDT | Severe Thunderstorm Warning | LWX | Anne Arundel, Calvert, Charles, Prince George's | 43 min |
| Jul 1, 4:29 PM EDT | Severe Thunderstorm Warning | LWX | Charles | 46 min |
| Jul 1, 6:23 PM EDT | Severe Thunderstorm Warning | LWX | Charles, Saint Mary's | 32 min |
| Jul 2, 6:29 PM EDT | Severe Thunderstorm Warning | LWX | Baltimore, City of Baltimore | 35 min |
| Jul 2, 7:06 PM EDT | Severe Thunderstorm Warning | LWX | Anne Arundel, Baltimore, City of Baltimore | 39 min |
| Jul 2, 7:19 PM EDT | Severe Thunderstorm Warning | LWX | Anne Arundel | 41 min |
| Jul 2, 7:32 PM EDT | Severe Thunderstorm Warning | PHI | Kent, Queen Anne's | 43 min |
| Jul 2, 8:09 PM EDT | Severe Thunderstorm Warning | PHI | Caroline, Kent, Queen Anne's, Talbot | 51 min |
| Jul 2, 10:21 PM EDT | Severe Thunderstorm Warning | LWX | Garrett | 39 min |
| Jul 3, 4:52 PM EDT | Severe Thunderstorm Warning | LWX | Prince George's | 38 min |
| Jul 3, 5:24 PM EDT | Severe Thunderstorm Warning | LWX | Charles, Prince George's | 40 min |
| Jul 3, 5:53 PM EDT | Severe Thunderstorm Warning | LWX | Calvert, Charles, Prince George's | 42 min |
| Jul 3, 6:22 PM EDT | Severe Thunderstorm Warning | AKQ | Somerset, Wicomico, Worcester | 38 min |
| Jul 3, 6:27 PM EDT | Severe Thunderstorm Warning | PHI | Queen Anne's, Talbot | 63 min |
| Jul 3, 6:52 PM EDT | Severe Thunderstorm Warning | AKQ | Dorchester, Wicomico | 53 min |
| Jul 3, 7:00 PM EDT | Severe Thunderstorm Warning | PHI | Caroline, Talbot | 45 min |
| Jul 3, 7:08 PM EDT | Severe Thunderstorm Warning | AKQ | Dorchester, Wicomico | 37 min |
| Jul 3, 7:31 PM EDT | Severe Thunderstorm Warning | LWX | Baltimore, Harford, City of Baltimore | 44 min |
| Jul 3, 7:31 PM EDT | Severe Thunderstorm Warning | PHI | Caroline | 59 min |
| Jul 3, 7:42 PM EDT | Severe Thunderstorm Warning | AKQ | Dorchester, Wicomico | 48 min |
| Jul 3, 8:07 PM EDT | Severe Thunderstorm Warning | LWX | Cecil, Harford | 53 min |
| Jul 7, 11:54 AM EDT | Severe Thunderstorm Warning | LWX | Anne Arundel, Baltimore, Howard, Montgomery, Prince George's, City of Baltimore | 34 min |
| Jul 7, 2:29 PM EDT | Severe Thunderstorm Warning | LWX | Charles | 46 min |
| Jul 8, 2:07 PM EDT | Severe Thunderstorm Warning | PHI | Caroline, Kent, Queen Anne's | 23 min |
| Jul 9, 1:28 PM EDT | Severe Thunderstorm Warning | LWX | Frederick, Washington | 26 min |
| Jul 9, 3:14 PM EDT | Severe Thunderstorm Warning | LWX | Baltimore, Harford | 29 min |
| Jul 14, 4:30 PM EDT | Severe Thunderstorm Warning | LWX | Frederick, Washington | 45 min |
| Jul 14, 4:40 PM EDT | Severe Thunderstorm Warning | LWX | Montgomery | 50 min |
| Jul 14, 5:07 PM EDT | Severe Thunderstorm Warning | LWX | Montgomery | 38 min |
| Jul 14, 5:24 PM EDT | Severe Thunderstorm Warning | LWX | Montgomery | 51 min |
| Jul 14, 5:38 PM EDT | Severe Thunderstorm Warning | LWX | Montgomery, Prince George's | 52 min |
| Jul 14, 6:28 PM EDT | Severe Thunderstorm Warning | LWX | Prince George's | 47 min |
| Jul 14, 6:37 PM EDT | Severe Thunderstorm Warning | LWX | Charles, Prince George's | 53 min |
| Jul 14, 7:16 PM EDT | Severe Thunderstorm Warning | LWX | Calvert, Charles, Prince George's, Saint Mary's | 44 min |
| Jul 15, 7:56 PM EDT | Severe Thunderstorm Warning | LWX | Allegany, Garrett, Washington | 64 min |
| Jul 15, 8:07 PM EDT | Severe Thunderstorm Warning | LWX | Charles, Prince George's | 38 min |
| Jul 15, 8:15 PM EDT | Severe Thunderstorm Warning | LWX | Charles, Prince George's | 45 min |
| Jul 15, 8:31 PM EDT | Severe Thunderstorm Warning | LWX | Allegany, Washington | 44 min |
| Jul 19, 8:32 AM EDT | Severe Thunderstorm Warning | PHI | Caroline | 29 min |
| Jul 21, 1:15 AM EDT | Severe Thunderstorm Warning | LWX | Carroll, Frederick | 45 min |
| Jul 21, 1:25 AM EDT | Severe Thunderstorm Warning | LWX | Allegany | 30 min |
| Jul 21, 4:59 AM EDT | Severe Thunderstorm Warning | PHI | Caroline, Kent, Queen Anne's, Talbot | 46 min |
| Jul 24, 8:10 PM EDT | Severe Thunderstorm Warning | LWX | Washington | 23 min |
| Jul 25, 12:07 PM EDT | Severe Thunderstorm Warning | LWX | Anne Arundel, Baltimore, City of Baltimore | 38 min |
| Jul 25, 12:39 PM EDT | Severe Thunderstorm Warning | LWX | Prince George's | 51 min |
| Jul 25, 12:48 PM EDT | Severe Thunderstorm Warning | LWX | Anne Arundel, Prince George's | 15 min |
| Jul 25, 1:36 PM EDT | Severe Thunderstorm Warning | LWX | Anne Arundel | 23 min |
| Jul 25, 2:11 PM EDT | Severe Thunderstorm Warning | PHI | Queen Anne's, Talbot | 49 min |
| Jul 25, 2:20 PM EDT | Severe Thunderstorm Warning | LWX | Anne Arundel, Calvert, Prince George's | 17 min |
| Jul 25, 2:51 PM EDT | Severe Thunderstorm Warning | PHI | Caroline, Queen Anne's, Talbot | 39 min |
| Jul 25, 3:21 PM EDT | Severe Thunderstorm Warning | PHI | Caroline | 39 min |
| Jul 25, 8:03 PM EDT | Severe Thunderstorm Warning | LWX | Charles, Prince George's | 42 min |
| Jul 25, 8:23 PM EDT | Severe Thunderstorm Warning | LWX | Charles | 22 min |
| Jul 25, 8:36 PM EDT | Severe Thunderstorm Warning | LWX | Calvert, Charles, Prince George's, Saint Mary's | 39 min |
| Jul 27, 3:36 PM EDT | Severe Thunderstorm Warning | LWX | Frederick, Washington | 39 min |
| Jul 27, 3:51 PM EDT | Severe Thunderstorm Warning | LWX | Garrett | 54 min |
| Jul 27, 4:22 PM EDT | Severe Thunderstorm Warning | LWX | Frederick, Montgomery | 53 min |
| Jul 27, 5:12 PM EDT | Severe Thunderstorm Warning | LWX | Montgomery | 48 min |
| Jul 27, 5:55 PM EDT | Severe Thunderstorm Warning | LWX | Montgomery | 50 min |
| Jul 27, 6:24 PM EDT | Severe Thunderstorm Warning | LWX | Montgomery | 32 min |
| Jul 27, 6:54 PM EDT | Severe Thunderstorm Warning | LWX | Prince George's | 25 min |
| Jul 28, 5:31 PM EDT | Severe Thunderstorm Warning | LWX | Frederick, Washington | 44 min |
| Jul 28, 5:43 PM EDT | Severe Thunderstorm Warning | LWX | Frederick, Montgomery | 47 min |
| Jul 28, 6:09 PM EDT | Severe Thunderstorm Warning | LWX | Carroll, Frederick | 51 min |
| Jul 28, 6:22 PM EDT | Severe Thunderstorm Warning | LWX | Baltimore, Carroll, Frederick, Howard, Montgomery | 53 min |
| Jul 28, 6:28 PM EDT | Severe Thunderstorm Warning | LWX | Montgomery | 32 min |
| Jul 28, 6:46 PM EDT | Severe Thunderstorm Warning | LWX | Baltimore, Carroll | 59 min |
| Jul 28, 7:00 PM EDT | Severe Thunderstorm Warning | LWX | Anne Arundel, Baltimore, Harford, Howard, Montgomery, Prince George's and 1 more | 75 min |
| Jul 28, 7:10 PM EDT | Severe Thunderstorm Warning | LWX | Baltimore, Carroll, Howard, Montgomery | 35 min |
| Jul 28, 7:17 PM EDT | Severe Thunderstorm Warning | LWX | Baltimore, Carroll | 13 min |
| Jul 28, 7:41 PM EDT | Severe Thunderstorm Warning | LWX | Cecil, Harford | 79 min |
| Jul 28, 8:12 PM EDT | Severe Thunderstorm Warning | LWX | Montgomery, Prince George's | 48 min |
| Jul 28, 8:18 PM EDT | Severe Thunderstorm Warning | PHI | Kent, Queen Anne's | 42 min |
| Jul 28, 9:00 PM EDT | Severe Thunderstorm Warning | LWX | Anne Arundel, Prince George's | 30 min |
| Jul 28, 9:12 PM EDT | Severe Thunderstorm Warning | LWX | Charles, Prince George's | 33 min |
| Jul 28, 9:30 PM EDT | Severe Thunderstorm Warning | PHI | Caroline, Kent, Queen Anne's, Talbot | 45 min |
| Jul 28, 10:07 PM EDT | Severe Thunderstorm Warning | PHI | Caroline, Kent, Queen Anne's | 38 min |
| Jul 28, 10:39 PM EDT | Severe Thunderstorm Warning | AKQ | Dorchester, Wicomico | 36 min |
| Jul 28, 10:44 PM EDT | Severe Thunderstorm Warning | PHI | Kent | 31 min |
| Jul 28, 11:00 PM EDT | Severe Thunderstorm Warning | PHI | Caroline | 60 min |
| Jul 28, 11:33 PM EDT | Severe Thunderstorm Warning | PHI | Caroline | 27 min |
| Jul 29, 12:12 AM EDT | Severe Thunderstorm Warning | PHI | Caroline | 36 min |
| Jul 29, 3:40 PM EDT | Severe Thunderstorm Warning | LWX | Frederick, Howard, Montgomery | 50 min |
| Jul 29, 4:09 PM EDT | Severe Thunderstorm Warning | LWX | Montgomery | 21 min |
| Jul 29, 4:24 PM EDT | Severe Thunderstorm Warning | LWX | Anne Arundel, Howard, Montgomery, Prince George's | 81 min |
| Jul 29, 4:30 PM EDT | Severe Thunderstorm Warning | LWX | Baltimore, Cecil, Harford, Howard, City of Baltimore | 75 min |
| Jul 29, 4:35 PM EDT | Severe Thunderstorm Warning | LWX | Anne Arundel, Howard, Prince George's | 25 min |
| Jul 29, 4:37 PM EDT | Severe Thunderstorm Warning | LWX | Charles, Prince George's | 38 min |
| Jul 29, 4:55 PM EDT | Severe Thunderstorm Warning | LWX | Prince George's | 20 min |
| Jul 29, 5:00 PM EDT | Severe Thunderstorm Warning | LWX | Anne Arundel, Calvert, Charles, Prince George's | 45 min |
| Jul 29, 5:00 PM EDT | Severe Thunderstorm Warning | PHI | Kent, Queen Anne's | 60 min |
| Jul 29, 5:02 PM EDT | Severe Thunderstorm Warning | PHI | Caroline, Kent, Queen Anne's, Talbot | 73 min |
| Jul 29, 5:09 PM EDT | Severe Thunderstorm Warning | LWX | Prince George's | 21 min |
| Jul 29, 5:24 PM EDT | Severe Thunderstorm Warning | AKQ | Dorchester, Wicomico | 66 min |
| Jul 29, 5:39 PM EDT | Severe Thunderstorm Warning | LWX | Anne Arundel, Calvert, Charles, Prince George's, Saint Mary's | 66 min |
| Jul 29, 5:44 PM EDT | Severe Thunderstorm Warning | PHI | Caroline, Kent, Queen Anne's | 46 min |
| Jul 29, 5:53 PM EDT | Severe Thunderstorm Warning | LWX | Charles | 22 min |
| Jul 29, 6:00 PM EDT | Severe Thunderstorm Warning | PHI | Caroline | 75 min |
| Jul 29, 6:29 PM EDT | Severe Thunderstorm Warning | LWX | Calvert, Charles, Prince George's, Saint Mary's | 61 min |
| Jul 29, 6:32 PM EDT | Severe Thunderstorm Warning | AKQ | Dorchester, Somerset, Wicomico, Worcester | 58 min |
| Jul 29, 7:08 PM EDT | Severe Thunderstorm Warning | AKQ | Wicomico, Worcester | 40 min |
| Jul 29, 7:23 PM EDT | Severe Thunderstorm Warning | AKQ | Dorchester, Somerset, Worcester | 52 min |
| Jul 29, 7:30 PM EDT | Severe Thunderstorm Warning | LWX | Calvert, Charles, Saint Mary's | 45 min |
| Jul 29, 8:39 PM EDT | Severe Thunderstorm Warning | LWX | Charles, Saint Mary's | 51 min |
| Jul 29, 8:44 PM EDT | Severe Thunderstorm Warning | AKQ | Somerset, Worcester | 25 min |
| Aug 4, 6:51 PM EDT | Severe Thunderstorm Warning | LWX | Carroll, Frederick | 39 min |
| Aug 4, 7:58 PM EDT | Severe Thunderstorm Warning | LWX | Frederick, Washington | 36 min |
| Aug 7, 12:54 PM EDT | Severe Thunderstorm Warning | LWX | Allegany, Washington | 51 min |
| Aug 7, 1:14 PM EDT | Severe Thunderstorm Warning | LWX | Washington | 46 min |
| Aug 7, 1:19 PM EDT | Severe Thunderstorm Warning | LWX | Garrett | 56 min |
| Aug 7, 1:35 PM EDT | Severe Thunderstorm Warning | LWX | Washington | 40 min |
| Aug 7, 1:56 PM EDT | Severe Thunderstorm Warning | LWX | Carroll, Frederick, Washington | 49 min |
| Aug 7, 1:58 PM EDT | Severe Thunderstorm Warning | LWX | Allegany, Garrett | 62 min |
| Aug 7, 2:11 PM EDT | Severe Thunderstorm Warning | LWX | Allegany, Garrett | 20 min |
| Aug 7, 2:13 PM EDT | Severe Thunderstorm Warning | LWX | Washington | 47 min |
| Aug 7, 2:29 PM EDT | Severe Thunderstorm Warning | LWX | Allegany, Washington | 46 min |
| Aug 7, 2:41 PM EDT | Severe Thunderstorm Warning | LWX | Allegany | 34 min |
| Aug 7, 2:55 PM EDT | Severe Thunderstorm Warning | LWX | Garrett | 65 min |
| Aug 7, 2:55 PM EDT | Severe Thunderstorm Warning | LWX | Washington | 23 min |
| Aug 7, 3:07 PM EDT | Severe Thunderstorm Warning | LWX | Frederick, Washington | 38 min |
| Aug 7, 3:17 PM EDT | Severe Thunderstorm Warning | LWX | Frederick, Washington | 23 min |
| Aug 7, 3:17 PM EDT | Severe Thunderstorm Warning | LWX | Allegany, Washington | 58 min |
| Aug 7, 3:34 PM EDT | Severe Thunderstorm Warning | LWX | Carroll, Frederick, Washington | 56 min |
| Aug 7, 3:49 PM EDT | Severe Thunderstorm Warning | LWX | Frederick, Washington | 41 min |
| Aug 7, 4:25 PM EDT | Severe Thunderstorm Warning | LWX | Baltimore, Carroll, Frederick, Howard, Montgomery, Washington | 50 min |
| Aug 7, 4:38 PM EDT | Severe Thunderstorm Warning | LWX | Baltimore, Carroll, Frederick, Howard, Montgomery | 37 min |
| Aug 7, 5:06 PM EDT | Severe Thunderstorm Warning | LWX | Anne Arundel, Baltimore, Carroll, Cecil, Harford, Howard and 3 more | 39 min |
| Aug 7, 5:11 PM EDT | Severe Thunderstorm Warning | LWX | Carroll, Howard, Montgomery, Prince George's | 34 min |
| Aug 7, 5:35 PM EDT | Severe Thunderstorm Warning | LWX | Baltimore, Cecil, Harford | 55 min |
| Aug 7, 5:37 PM EDT | Severe Thunderstorm Warning | PHI | Kent | 53 min |
| Aug 7, 5:42 PM EDT | Severe Thunderstorm Warning | LWX | Anne Arundel, Baltimore, Howard, Montgomery, Prince George's, City of Baltimore | 48 min |
| Aug 7, 5:43 PM EDT | Severe Thunderstorm Warning | LWX | Anne Arundel, Calvert, Charles, Montgomery, Prince George's | 62 min |
| Aug 7, 5:57 PM EDT | Severe Thunderstorm Warning | PHI | Caroline, Kent, Queen Anne's, Talbot | 63 min |
| Aug 7, 6:21 PM EDT | Severe Thunderstorm Warning | PHI | Kent | 69 min |
| Aug 7, 6:58 PM EDT | Severe Thunderstorm Warning | PHI | Caroline, Kent, Queen Anne's, Talbot | 62 min |
| Aug 7, 7:01 PM EDT | Severe Thunderstorm Warning | AKQ | Dorchester | 59 min |
| Aug 7, 7:56 PM EDT | Severe Thunderstorm Warning | PHI | Caroline, Talbot | 49 min |
| Aug 7, 7:59 PM EDT | Severe Thunderstorm Warning | AKQ | Dorchester | 61 min |
| Aug 7, 8:22 PM EDT | Severe Thunderstorm Warning | LWX | Saint Mary's | 16 min |
| Aug 7, 8:59 PM EDT | Severe Thunderstorm Warning | AKQ | Dorchester, Somerset, Wicomico | 46 min |
| Aug 7, 9:32 PM EDT | Severe Thunderstorm Warning | LWX | Calvert, Charles, Prince George's, Saint Mary's | 14 min |
| Aug 7, 9:42 PM EDT | Severe Thunderstorm Warning | AKQ | Somerset, Wicomico, Worcester | 48 min |
| Aug 7, 10:27 PM EDT | Severe Thunderstorm Warning | AKQ | Wicomico, Worcester | 48 min |
| Aug 7, 10:45 PM EDT | Severe Thunderstorm Warning | AKQ | Somerset, Wicomico, Worcester | 45 min |
| Aug 7, 11:26 PM EDT | Severe Thunderstorm Warning | AKQ | Worcester | 26 min |
| Aug 10, 12:25 PM EDT | Severe Thunderstorm Warning | LWX | Cecil, Harford | 35 min |
| Aug 10, 12:51 PM EDT | Severe Thunderstorm Warning | LWX | Cecil | 39 min |
| Aug 12, 9:49 PM EDT | Severe Thunderstorm Warning | LWX | Garrett | 41 min |
| Aug 12, 10:29 PM EDT | Severe Thunderstorm Warning | LWX | Allegany, Garrett | 31 min |
| Aug 14, 3:47 PM EDT | Severe Thunderstorm Warning | LWX | Calvert, Saint Mary's | 43 min |
| Aug 14, 4:02 PM EDT | Severe Thunderstorm Warning | LWX | Charles, Prince George's | 28 min |
| Aug 14, 4:25 PM EDT | Severe Thunderstorm Warning | LWX | Montgomery, Prince George's | 35 min |
| Aug 14, 4:31 PM EDT | Severe Thunderstorm Warning | LWX | Calvert, Saint Mary's | 28 min |
| Aug 14, 4:47 PM EDT | Severe Thunderstorm Warning | LWX | Anne Arundel, Howard, Montgomery, Prince George's | 43 min |
| Aug 14, 6:13 PM EDT | Severe Thunderstorm Warning | AKQ | Somerset | 47 min |
| Aug 14, 6:23 PM EDT | Severe Thunderstorm Warning | PHI | Caroline, Kent, Queen Anne's, Talbot | 29 min |
| Aug 15, 3:40 PM EDT | Severe Thunderstorm Warning | PHI | Caroline, Kent, Queen Anne's | 50 min |
| Aug 15, 4:15 PM EDT | Severe Thunderstorm Warning | AKQ | Dorchester, Somerset, Wicomico | 45 min |
| Aug 15, 4:56 PM EDT | Severe Thunderstorm Warning | AKQ | Dorchester, Wicomico | 32 min |
| Aug 15, 5:00 PM EDT | Severe Thunderstorm Warning | PHI | Caroline | 45 min |
| Aug 15, 6:02 PM EDT | Severe Thunderstorm Warning | AKQ | Dorchester | 32 min |
| Aug 17, 11:05 PM EDT | Severe Thunderstorm Warning | LWX | Charles | 25 min |
| Aug 25, 2:58 AM EDT | Severe Thunderstorm Warning | LWX | Garrett | 32 min |
| Aug 25, 6:36 PM EDT | Severe Thunderstorm Warning | LWX | Montgomery | 24 min |
| Aug 25, 6:59 PM EDT | Severe Thunderstorm Warning | LWX | Montgomery | 46 min |
| Sep 7, 11:45 AM EDT | Severe Thunderstorm Warning | LWX | Allegany | 29 min |
| Sep 7, 1:23 PM EDT | Severe Thunderstorm Warning | LWX | Washington | 50 min |
| Sep 7, 1:42 PM EDT | Severe Thunderstorm Warning | LWX | Montgomery | 33 min |
| Sep 7, 1:55 PM EDT | Severe Thunderstorm Warning | LWX | Frederick, Washington | 50 min |
| Sep 7, 2:09 PM EDT | Severe Thunderstorm Warning | LWX | Frederick, Montgomery | 51 min |
| Sep 7, 2:31 PM EDT | Severe Thunderstorm Warning | LWX | Carroll, Frederick, Howard, Montgomery | 44 min |
| Sep 7, 3:14 PM EDT | Severe Thunderstorm Warning | LWX | Baltimore, Carroll, Frederick | 46 min |
| Sep 7, 3:55 PM EDT | Severe Thunderstorm Warning | LWX | Baltimore, Harford | 35 min |
| Sep 7, 4:11 PM EDT | Severe Thunderstorm Warning | LWX | Baltimore, City of Baltimore | 49 min |
| Sep 7, 4:28 PM EDT | Severe Thunderstorm Warning | LWX | Baltimore, Harford | 32 min |
| Sep 7, 4:58 PM EDT | Severe Thunderstorm Warning | LWX | Baltimore, Harford | 33 min |
| Sep 7, 5:16 PM EDT | Severe Thunderstorm Warning | LWX | Howard, Montgomery, Prince George's | 44 min |
| Sep 7, 5:47 PM EDT | Severe Thunderstorm Warning | LWX | Carroll | 15 min |
| Sep 7, 6:49 PM EDT | Severe Thunderstorm Warning | LWX | Baltimore, Cecil, Harford | 26 min |
| Sep 7, 7:17 PM EDT | Severe Thunderstorm Warning | LWX | Calvert, Saint Mary's | 28 min |
| Sep 7, 7:55 PM EDT | Severe Thunderstorm Warning | PHI | Talbot | 26 min |
| Sep 7, 8:45 PM EDT | Severe Thunderstorm Warning | PHI | Caroline, Talbot | 26 min |
| Sep 7, 9:14 PM EDT | Severe Thunderstorm Warning | PHI | Caroline, Queen Anne's | 30 min |
| Sep 8, 4:22 AM EDT | Severe Thunderstorm Warning | LWX | Anne Arundel, Baltimore, City of Baltimore | 23 min |
| Sep 8, 6:19 PM EDT | Severe Thunderstorm Warning | LWX | Montgomery | 41 min |
| Sep 8, 6:41 PM EDT | Severe Thunderstorm Warning | LWX | Baltimore, Harford | 34 min |
| Sep 8, 7:18 PM EDT | Severe Thunderstorm Warning | LWX | Baltimore, Harford | 27 min |
| Sep 8, 7:27 PM EDT | Severe Thunderstorm Warning | LWX | Baltimore, Carroll, Howard | 48 min |
| Sep 8, 8:00 PM EDT | Severe Thunderstorm Warning | LWX | Baltimore, Carroll | 30 min |
| Sep 8, 8:22 PM EDT | Severe Thunderstorm Warning | LWX | Baltimore, Cecil, Harford | 53 min |
| Sep 8, 9:30 PM EDT | Severe Thunderstorm Warning | LWX | Charles, Prince George's | 33 min |
| Sep 8, 9:45 PM EDT | Severe Thunderstorm Warning | LWX | Cecil | 30 min |
| Sep 8, 11:11 PM EDT | Severe Thunderstorm Warning | PHI | Kent, Queen Anne's | 49 min |
| Sep 8, 11:50 PM EDT | Severe Thunderstorm Warning | PHI | Kent, Queen Anne's, Talbot | 40 min |
| Sep 9, 2:57 AM EDT | Severe Thunderstorm Warning | LWX | Howard, Montgomery | 22 min |
| Sep 9, 2:25 PM EDT | Severe Thunderstorm Warning | LWX | Prince George's | 24 min |
| Sep 9, 3:18 PM EDT | Severe Thunderstorm Warning | LWX | Montgomery | 42 min |
| Sep 9, 3:41 PM EDT | Severe Thunderstorm Warning | LWX | Montgomery | 32 min |
| Sep 9, 3:56 PM EDT | Severe Thunderstorm Warning | LWX | Carroll, Frederick, Howard, Montgomery | 38 min |
| Sep 9, 4:02 PM EDT | Severe Thunderstorm Warning | LWX | Frederick, Montgomery | 43 min |
| Sep 9, 4:33 PM EDT | Severe Thunderstorm Warning | LWX | Frederick, Washington | 16 min |
| Sep 9, 4:39 PM EDT | Severe Thunderstorm Warning | LWX | Charles | 36 min |
| Sep 9, 4:46 PM EDT | Severe Thunderstorm Warning | LWX | Calvert, Saint Mary's | 28 min |
| Sep 9, 6:00 PM EDT | Severe Thunderstorm Warning | LWX | Washington | 30 min |
| Sep 9, 6:17 PM EDT | Severe Thunderstorm Warning | PHI | Kent, Queen Anne's | 43 min |
| Sep 9, 6:36 PM EDT | Severe Thunderstorm Warning | LWX | Cecil | 54 min |
| Sep 12, 10:38 PM EDT | Severe Thunderstorm Warning | LWX | Montgomery, Prince George's | 37 min |
| Sep 12, 11:00 PM EDT | Severe Thunderstorm Warning | LWX | Anne Arundel, Howard, Montgomery, Prince George's | 30 min |
| Sep 13, 12:02 AM EDT | Severe Thunderstorm Warning | LWX | Baltimore, Harford | 28 min |
| Sep 13, 12:08 AM EDT | Severe Thunderstorm Warning | PHI | Caroline, Kent, Queen Anne's, Talbot | 52 min |
| Sep 13, 12:44 AM EDT | Severe Thunderstorm Warning | LWX | Cecil | 31 min |
| Sep 13, 12:49 AM EDT | Severe Thunderstorm Warning | PHI | Kent, Queen Anne's | 26 min |
| Sep 13, 1:45 AM EDT | Severe Thunderstorm Warning | PHI | Caroline, Queen Anne's | 45 min |
By county
Every county with at least one alert. A county page lists each alert that covered it.
- Prince George's County52
- Baltimore County47
- Montgomery County47
- Caroline County39
- Queen Anne's County37
- Charles County36
- Frederick County34
- Harford County31
- Talbot County29
- Kent County29
- Anne Arundel County29
- Washington County28
- Carroll County27
- Howard County26
- Saint Mary's County22
- Wicomico County22
- Calvert County19
- City of Baltimore18
- Dorchester County18
- Somerset County18
- Cecil County16
- Worcester County15
- Allegany County14
- Garrett County13
The busiest days
Days with the most alerts issued, by UTC date.
Nearby
Alerts in force nowTornadoes on recordThe radar archive20222024
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.