Alert archive / Maryland / Severe Thunderstorm Warnings
Severe Thunderstorm Warnings in Maryland, 2017
261 severe thunderstorm warnings in 2017. 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 2017. Tap one for its archive.
- Severe Thunderstorm Warnings
- 261
- Busiest month
- July71 severe thunderstorm warnings
- Busiest day
- February 25, 201717 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.
186 of 261 severe thunderstorm warnings covering Maryland in 2017 had a qualifying storm report inside them; 458 of 546 hail, wind and damage reports fell inside a warning, on average 20 minutes after it went out.
Maryland, 2017
| Warnings | With a report | False alarm ratio | Reports | Inside a warning | Mean lead time | |
|---|---|---|---|---|---|---|
| Severe thunderstorm warnings | 261 | 186 | 29% | 546 | 84% | 20 min |
Each office's whole area, 2017
| Warnings | With a report | False alarm ratio | Reports | Inside a warning | Mean lead time | |
|---|---|---|---|---|---|---|
| NWS Pittsburgh, PA: severe thunderstorm warnings | 225 | 186 | 17% | 518 | 88% | 21 min |
| NWS Baltimore/Washington: severe thunderstorm warnings | 261 | 194 | 26% | 976 | 81% | 19 min |
| NWS Philadelphia/Mount Holly: severe thunderstorm warnings | 197 | 120 | 39% | 396 | 79% | 26 min |
| NWS Wakefield, VA: severe thunderstorm warnings | 183 | 103 | 44% | 289 | 79% | 19 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 12, 8:46 PM EST | Severe Thunderstorm Warning | PBZ | Garrett | 74 min |
| Feb 12, 9:00 PM EST | Severe Thunderstorm Warning | LWX | Allegany, Washington | 45 min |
| Feb 12, 9:32 PM EST | Severe Thunderstorm Warning | LWX | Allegany, Carroll, Frederick, Washington | 43 min |
| Feb 12, 10:01 PM EST | Severe Thunderstorm Warning | LWX | Carroll, Frederick, Montgomery, Washington | 44 min |
| Feb 12, 10:29 PM EST | Severe Thunderstorm Warning | LWX | Anne Arundel, Baltimore, Carroll, Frederick, Harford, Howard and 2 more | 61 min |
| Feb 12, 10:38 PM EST | Severe Thunderstorm Warning | LWX | Anne Arundel, Frederick, Howard, Montgomery, Prince George's | 38 min |
| Feb 12, 11:02 PM EST | Severe Thunderstorm Warning | LWX | Anne Arundel, Calvert, Howard, Montgomery, Prince George's | 43 min |
| Feb 12, 11:10 PM EST | Severe Thunderstorm Warning | PHI | Cecil | 50 min |
| Feb 12, 11:14 PM EST | Severe Thunderstorm Warning | PHI | Caroline, Kent, Queen Anne's, Talbot | 46 min |
| Feb 12, 11:53 PM EST | Severe Thunderstorm Warning | PHI | Caroline, Queen Anne's, Talbot | 52 min |
| Feb 25, 2:07 PM EST | Severe Thunderstorm Warning | LWX | Carroll, Frederick | 38 min |
| Feb 25, 2:12 PM EST | Severe Thunderstorm Warning | LWX | Frederick, Montgomery | 10 min |
| Feb 25, 2:27 PM EST | Severe Thunderstorm Warning | LWX | Charles | 48 min |
| Feb 25, 2:35 PM EST | Severe Thunderstorm Warning | LWX | Charles, Prince George's | 40 min |
| Feb 25, 2:39 PM EST | Severe Thunderstorm Warning | LWX | Baltimore, Carroll | 29 min |
| Feb 25, 2:52 PM EST | Severe Thunderstorm Warning | LWX | Anne Arundel, Calvert, Charles, Prince George's, Saint Mary's | 38 min |
| Feb 25, 3:18 PM EST | Severe Thunderstorm Warning | PHI | Caroline, Queen Anne's, Talbot | 57 min |
| Feb 25, 3:24 PM EST | Severe Thunderstorm Warning | LWX | Baltimore, Harford | 24 min |
| Feb 25, 3:26 PM EST | Severe Thunderstorm Warning | PHI | Cecil | 64 min |
| Feb 25, 3:29 PM EST | Severe Thunderstorm Warning | LWX | Anne Arundel, Calvert, Prince George's | 35 min |
| Feb 25, 3:39 PM EST | Severe Thunderstorm Warning | LWX | Calvert, Charles, Prince George's, Saint Mary's | 26 min |
| Feb 25, 4:00 PM EST | Severe Thunderstorm Warning | LWX | Saint Mary's | 45 min |
| Feb 25, 4:04 PM EST | Severe Thunderstorm Warning | PHI | Caroline, Cecil, Kent, Queen Anne's | 41 min |
| Feb 25, 4:11 PM EST | Severe Thunderstorm Warning | PHI | Caroline, Kent, Queen Anne's, Talbot | 49 min |
| Feb 25, 4:15 PM EST | Severe Thunderstorm Warning | AKQ | Dorchester | 13 min |
| Feb 25, 4:39 PM EST | Severe Thunderstorm Warning | AKQ | Dorchester, Wicomico | 51 min |
| Feb 25, 4:50 PM EST | Severe Thunderstorm Warning | PHI | Caroline, Talbot | 55 min |
| Mar 1, 5:02 AM EST | Severe Thunderstorm Warning | PBZ | Garrett | 28 min |
| Mar 1, 11:11 AM EST | Severe Thunderstorm Warning | PBZ | Garrett | 49 min |
| Mar 1, 12:12 PM EST | Severe Thunderstorm Warning | LWX | Allegany, Washington | 33 min |
| Mar 1, 12:42 PM EST | Severe Thunderstorm Warning | LWX | Frederick, Washington | 48 min |
| Mar 1, 1:05 PM EST | Severe Thunderstorm Warning | LWX | Charles, Montgomery, Prince George's | 40 min |
| Mar 1, 1:14 PM EST | Severe Thunderstorm Warning | LWX | Baltimore, Carroll, Frederick, Howard, Montgomery, Prince George's | 46 min |
| Mar 1, 1:36 PM EST | Severe Thunderstorm Warning | LWX | Calvert, Charles, Prince George's, Saint Mary's | 54 min |
| Mar 1, 1:40 PM EST | Severe Thunderstorm Warning | LWX | Anne Arundel, Calvert, Charles, Montgomery, Prince George's | 50 min |
| Mar 1, 1:47 PM EST | Severe Thunderstorm Warning | LWX | Anne Arundel, Baltimore, Carroll, Harford, Howard, Montgomery and 2 more | 58 min |
| Mar 1, 2:00 PM EST | Severe Thunderstorm Warning | PHI | Cecil, Kent | 45 min |
| Mar 1, 2:09 PM EST | Severe Thunderstorm Warning | PHI | Caroline, Kent, Queen Anne's, Talbot | 51 min |
| Mar 1, 2:21 PM EST | Severe Thunderstorm Warning | LWX | Saint Mary's | 28 min |
| Mar 1, 2:29 PM EST | Severe Thunderstorm Warning | AKQ | Dorchester, Wicomico | 46 min |
| Mar 1, 2:45 PM EST | Severe Thunderstorm Warning | PHI | Caroline | 60 min |
| Apr 6, 11:41 AM EDT | Severe Thunderstorm Warning | LWX | Charles | 38 min |
| Apr 6, 12:17 PM EDT | Severe Thunderstorm Warning | PHI | Caroline, Kent, Queen Anne's, Talbot | 24 min |
| Apr 6, 1:08 PM EDT | Severe Thunderstorm Warning | PHI | Caroline, Talbot | 40 min |
| Apr 6, 1:12 PM EDT | Severe Thunderstorm Warning | LWX | Montgomery, Prince George's | 48 min |
| Apr 6, 1:57 PM EDT | Severe Thunderstorm Warning | LWX | Baltimore, Carroll, Howard, Montgomery | 48 min |
| Apr 6, 2:01 PM EDT | Severe Thunderstorm Warning | LWX | Anne Arundel, Baltimore, Calvert, Howard, Montgomery, Prince George's and 1 more | 44 min |
| Apr 6, 2:48 PM EDT | Severe Thunderstorm Warning | LWX | Baltimore, Harford | 27 min |
| Apr 6, 4:18 PM EDT | Severe Thunderstorm Warning | LWX | Calvert, Charles, Prince George's, Saint Mary's | 27 min |
| Apr 20, 4:35 PM EDT | Severe Thunderstorm Warning | PBZ | Garrett | 28 min |
| Apr 20, 8:05 PM EDT | Severe Thunderstorm Warning | LWX | Montgomery, Prince George's | 40 min |
| Apr 21, 4:00 PM EDT | Severe Thunderstorm Warning | LWX | Montgomery | 45 min |
| Apr 21, 4:36 PM EDT | Severe Thunderstorm Warning | LWX | Montgomery, Prince George's | 39 min |
| Apr 21, 5:04 PM EDT | Severe Thunderstorm Warning | LWX | Anne Arundel, Prince George's | 41 min |
| Apr 21, 5:40 PM EDT | Severe Thunderstorm Warning | LWX | Anne Arundel, Calvert, Prince George's | 25 min |
| Apr 21, 8:01 PM EDT | Severe Thunderstorm Warning | LWX | Saint Mary's | 44 min |
| Apr 21, 8:17 PM EDT | Severe Thunderstorm Warning | PHI | Caroline, Queen Anne's, Talbot | 43 min |
| Apr 22, 12:06 AM EDT | Severe Thunderstorm Warning | LWX | Charles, Saint Mary's | 39 min |
| May 1, 5:03 PM EDT | Severe Thunderstorm Warning | PBZ | Garrett | 41 min |
| May 1, 5:25 PM EDT | Severe Thunderstorm Warning | LWX | Allegany | 29 min |
| May 5, 7:49 AM EDT | Severe Thunderstorm Warning | LWX | Charles, Prince George's, Saint Mary's | 56 min |
| May 5, 8:29 AM EDT | Severe Thunderstorm Warning | LWX | Anne Arundel, Calvert, Charles, Prince George's, Saint Mary's | 61 min |
| May 5, 8:35 AM EDT | Severe Thunderstorm Warning | LWX | Anne Arundel, Calvert, Charles, Montgomery, Prince George's, Saint Mary's | 21 min |
| May 5, 9:00 AM EDT | Severe Thunderstorm Warning | AKQ | Dorchester | 45 min |
| May 5, 9:00 AM EDT | Severe Thunderstorm Warning | PHI | Caroline, Cecil, Kent, Queen Anne's, Talbot | 60 min |
| May 5, 9:20 AM EDT | Severe Thunderstorm Warning | LWX | Anne Arundel, Baltimore, Harford, City of Baltimore | 37 min |
| May 5, 10:00 AM EDT | Severe Thunderstorm Warning | PHI | Caroline, Cecil, Kent, Queen Anne's | 45 min |
| May 5, 6:51 PM EDT | Severe Thunderstorm Warning | PBZ | Garrett | 39 min |
| May 18, 5:44 PM EDT | Severe Thunderstorm Warning | LWX | Carroll | 46 min |
| May 18, 6:00 PM EDT | Severe Thunderstorm Warning | LWX | Washington | 24 min |
| May 18, 7:03 PM EDT | Severe Thunderstorm Warning | LWX | Montgomery | 42 min |
| May 18, 8:23 PM EDT | Severe Thunderstorm Warning | LWX | Charles, Prince George's | 34 min |
| May 19, 4:21 PM EDT | Severe Thunderstorm Warning | PHI | Cecil | 24 min |
| May 19, 4:53 PM EDT | Severe Thunderstorm Warning | PBZ | Garrett | 37 min |
| May 19, 6:17 PM EDT | Severe Thunderstorm Warning | LWX | Montgomery | 31 min |
| May 19, 6:31 PM EDT | Severe Thunderstorm Warning | LWX | Howard, Montgomery | 33 min |
| May 19, 6:47 PM EDT | Severe Thunderstorm Warning | LWX | Anne Arundel, Howard, Prince George's | 43 min |
| May 19, 6:57 PM EDT | Severe Thunderstorm Warning | LWX | Howard, Montgomery, Prince George's | 22 min |
| May 19, 7:21 PM EDT | Severe Thunderstorm Warning | LWX | Anne Arundel, Prince George's | 36 min |
| May 19, 8:13 PM EDT | Severe Thunderstorm Warning | PHI | Caroline, Kent, Queen Anne's, Talbot | 32 min |
| May 19, 10:33 PM EDT | Severe Thunderstorm Warning | LWX | Anne Arundel, Baltimore, Howard, City of Baltimore | 42 min |
| May 25, 4:26 PM EDT | Severe Thunderstorm Warning | LWX | Charles, Saint Mary's | 49 min |
| May 25, 4:55 PM EDT | Severe Thunderstorm Warning | LWX | Charles, Prince George's | 50 min |
| May 25, 5:04 PM EDT | Severe Thunderstorm Warning | LWX | Anne Arundel, Calvert, Charles, Prince George's, Saint Mary's | 41 min |
| May 25, 5:28 PM EDT | Severe Thunderstorm Warning | LWX | Charles, Prince George's | 17 min |
| May 25, 5:38 PM EDT | Severe Thunderstorm Warning | AKQ | Dorchester, Somerset, Wicomico | 37 min |
| May 25, 5:48 PM EDT | Severe Thunderstorm Warning | PHI | Queen Anne's, Talbot | 42 min |
| May 25, 6:11 PM EDT | Severe Thunderstorm Warning | AKQ | Somerset, Wicomico, Worcester | 49 min |
| May 25, 6:11 PM EDT | Severe Thunderstorm Warning | LWX | Anne Arundel, Baltimore, Howard, Prince George's, City of Baltimore | 49 min |
| May 25, 6:26 PM EDT | Severe Thunderstorm Warning | PHI | Caroline, Kent, Queen Anne's, Talbot | 49 min |
| May 25, 7:02 PM EDT | Severe Thunderstorm Warning | LWX | Baltimore, City of Baltimore | 43 min |
| May 25, 7:09 PM EDT | Severe Thunderstorm Warning | PHI | Cecil, Kent, Queen Anne's | 51 min |
| May 25, 7:56 PM EDT | Severe Thunderstorm Warning | PHI | Cecil, Kent | 49 min |
| May 31, 5:12 PM EDT | Severe Thunderstorm Warning | LWX | Montgomery | 26 min |
| May 31, 5:47 PM EDT | Severe Thunderstorm Warning | LWX | Anne Arundel, Howard, Montgomery, Prince George's | 29 min |
| May 31, 6:34 PM EDT | Severe Thunderstorm Warning | LWX | Anne Arundel, Baltimore, City of Baltimore | 22 min |
| Jun 14, 4:54 PM EDT | Severe Thunderstorm Warning | LWX | Allegany | 24 min |
| Jun 19, 12:50 PM EDT | Severe Thunderstorm Warning | LWX | Frederick, Washington | 40 min |
| Jun 19, 12:59 PM EDT | Severe Thunderstorm Warning | LWX | Frederick, Washington | 46 min |
| Jun 19, 1:41 PM EDT | Severe Thunderstorm Warning | LWX | Carroll, Frederick, Washington | 49 min |
| Jun 19, 2:07 PM EDT | Severe Thunderstorm Warning | LWX | Frederick, Washington | 38 min |
| Jun 19, 3:00 PM EDT | Severe Thunderstorm Warning | LWX | Carroll, Frederick, Howard, Montgomery | 45 min |
| Jun 19, 3:19 PM EDT | Severe Thunderstorm Warning | LWX | Montgomery, Prince George's | 41 min |
| Jun 19, 4:00 PM EDT | Severe Thunderstorm Warning | LWX | Anne Arundel, Howard, Prince George's, City of Baltimore | 45 min |
| Jun 19, 4:07 PM EDT | Severe Thunderstorm Warning | PHI | Cecil | 38 min |
| Jun 19, 4:38 PM EDT | Severe Thunderstorm Warning | PHI | Caroline, Cecil, Kent, Queen Anne's, Talbot | 52 min |
| Jun 19, 4:49 PM EDT | Severe Thunderstorm Warning | LWX | Calvert, Charles, Saint Mary's | 41 min |
| Jun 19, 4:59 PM EDT | Severe Thunderstorm Warning | PHI | Caroline, Talbot | 46 min |
| Jun 19, 5:28 PM EDT | Severe Thunderstorm Warning | AKQ | Dorchester, Wicomico | 47 min |
| Jun 19, 5:28 PM EDT | Severe Thunderstorm Warning | PHI | Caroline | 62 min |
| Jun 19, 5:38 PM EDT | Severe Thunderstorm Warning | PHI | Caroline, Talbot | 67 min |
| Jun 19, 8:01 PM EDT | Severe Thunderstorm Warning | AKQ | Dorchester, Somerset, Wicomico, Worcester | 44 min |
| Jun 21, 6:57 PM EDT | Severe Thunderstorm Warning | PHI | Caroline, Cecil, Kent, Queen Anne's | 48 min |
| Jun 21, 7:42 PM EDT | Severe Thunderstorm Warning | PHI | Caroline, Queen Anne's | 36 min |
| Jun 23, 5:29 PM EDT | Severe Thunderstorm Warning | PBZ | Garrett | 61 min |
| Jun 23, 6:33 PM EDT | Severe Thunderstorm Warning | PBZ | Garrett | 42 min |
| Jun 23, 8:56 PM EDT | Severe Thunderstorm Warning | PBZ | Garrett | 64 min |
| Jul 1, 2:38 PM EDT | Severe Thunderstorm Warning | LWX | Montgomery | 41 min |
| Jul 1, 3:00 PM EDT | Severe Thunderstorm Warning | LWX | Montgomery, Prince George's | 45 min |
| Jul 1, 3:01 PM EDT | Severe Thunderstorm Warning | LWX | Carroll, Frederick | 26 min |
| Jul 1, 3:31 PM EDT | Severe Thunderstorm Warning | LWX | Anne Arundel, Howard, Montgomery, Prince George's | 44 min |
| Jul 1, 3:56 PM EDT | Severe Thunderstorm Warning | LWX | Baltimore, Harford | 64 min |
| Jul 1, 4:01 PM EDT | Severe Thunderstorm Warning | LWX | Anne Arundel | 34 min |
| Jul 1, 4:33 PM EDT | Severe Thunderstorm Warning | LWX | Anne Arundel, Calvert, Prince George's | 42 min |
| Jul 1, 4:38 PM EDT | Severe Thunderstorm Warning | PHI | Cecil, Kent, Queen Anne's | 67 min |
| Jul 1, 5:39 PM EDT | Severe Thunderstorm Warning | PHI | Caroline, Queen Anne's, Talbot | 51 min |
| Jul 1, 6:02 PM EDT | Severe Thunderstorm Warning | LWX | Calvert | 43 min |
| Jul 1, 6:22 PM EDT | Severe Thunderstorm Warning | AKQ | Dorchester, Wicomico | 38 min |
| Jul 1, 7:22 PM EDT | Severe Thunderstorm Warning | LWX | Saint Mary's | 38 min |
| Jul 1, 7:51 PM EDT | Severe Thunderstorm Warning | LWX | Saint Mary's | 28 min |
| Jul 4, 4:45 PM EDT | Severe Thunderstorm Warning | LWX | Frederick, Washington | 45 min |
| Jul 4, 5:31 PM EDT | Severe Thunderstorm Warning | LWX | Frederick | 31 min |
| Jul 4, 6:07 PM EDT | Severe Thunderstorm Warning | LWX | Carroll, Frederick, Howard, Montgomery | 38 min |
| Jul 6, 5:55 PM EDT | Severe Thunderstorm Warning | AKQ | Dorchester | 36 min |
| Jul 6, 11:01 PM EDT | Severe Thunderstorm Warning | LWX | Saint Mary's | 14 min |
| Jul 7, 4:01 PM EDT | Severe Thunderstorm Warning | PBZ | Garrett | 44 min |
| Jul 7, 5:55 PM EDT | Severe Thunderstorm Warning | LWX | Allegany | 27 min |
| Jul 7, 7:40 PM EDT | Severe Thunderstorm Warning | LWX | Charles, Montgomery, Prince George's | 35 min |
| Jul 8, 6:13 PM EDT | Severe Thunderstorm Warning | AKQ | Somerset | 47 min |
| Jul 8, 7:24 PM EDT | Severe Thunderstorm Warning | AKQ | Worcester | 36 min |
| Jul 13, 5:14 PM EDT | Severe Thunderstorm Warning | PHI | Caroline, Kent, Queen Anne's | 46 min |
| Jul 14, 1:35 PM EDT | Severe Thunderstorm Warning | LWX | Frederick, Washington | 40 min |
| Jul 14, 2:31 PM EDT | Severe Thunderstorm Warning | PHI | Cecil | 59 min |
| Jul 14, 3:18 PM EDT | Severe Thunderstorm Warning | PHI | Cecil | 12 min |
| Jul 14, 3:23 PM EDT | Severe Thunderstorm Warning | PHI | Cecil | 67 min |
| Jul 14, 4:14 PM EDT | Severe Thunderstorm Warning | LWX | Montgomery | 27 min |
| Jul 14, 4:24 PM EDT | Severe Thunderstorm Warning | LWX | Prince George's | 51 min |
| Jul 14, 4:54 PM EDT | Severe Thunderstorm Warning | LWX | Anne Arundel, Calvert, Prince George's | 39 min |
| Jul 14, 5:24 PM EDT | Severe Thunderstorm Warning | LWX | Anne Arundel | 24 min |
| Jul 14, 5:40 PM EDT | Severe Thunderstorm Warning | PHI | Caroline, Kent, Queen Anne's, Talbot | 65 min |
| Jul 14, 5:54 PM EDT | Severe Thunderstorm Warning | PHI | Caroline, Talbot | 51 min |
| Jul 14, 6:20 PM EDT | Severe Thunderstorm Warning | PHI | Caroline, Talbot | 40 min |
| Jul 14, 6:27 PM EDT | Severe Thunderstorm Warning | AKQ | Dorchester | 47 min |
| Jul 17, 2:21 PM EDT | Severe Thunderstorm Warning | LWX | Baltimore, Carroll | 39 min |
| Jul 17, 2:59 PM EDT | Severe Thunderstorm Warning | LWX | Carroll, Frederick | 46 min |
| Jul 17, 3:06 PM EDT | Severe Thunderstorm Warning | LWX | Howard, Montgomery | 39 min |
| Jul 17, 3:13 PM EDT | Severe Thunderstorm Warning | LWX | Baltimore, Carroll | 47 min |
| Jul 17, 3:40 PM EDT | Severe Thunderstorm Warning | LWX | Howard, Montgomery | 50 min |
| Jul 17, 4:15 PM EDT | Severe Thunderstorm Warning | LWX | Montgomery | 32 min |
| Jul 17, 6:30 PM EDT | Severe Thunderstorm Warning | LWX | Allegany | 17 min |
| Jul 18, 3:20 PM EDT | Severe Thunderstorm Warning | LWX | Baltimore, Howard | 25 min |
| Jul 22, 12:57 PM EDT | Severe Thunderstorm Warning | LWX | Frederick, Washington | 48 min |
| Jul 22, 2:03 PM EDT | Severe Thunderstorm Warning | LWX | Howard, Montgomery | 27 min |
| Jul 22, 2:23 PM EDT | Severe Thunderstorm Warning | LWX | Anne Arundel, Howard, Montgomery, Prince George's | 52 min |
| Jul 22, 3:03 PM EDT | Severe Thunderstorm Warning | PHI | Caroline, Queen Anne's, Talbot | 42 min |
| Jul 22, 3:38 PM EDT | Severe Thunderstorm Warning | PHI | Caroline, Queen Anne's, Talbot | 52 min |
| Jul 22, 3:47 PM EDT | Severe Thunderstorm Warning | AKQ | Dorchester, Wicomico | 43 min |
| Jul 22, 4:30 PM EDT | Severe Thunderstorm Warning | AKQ | Dorchester, Wicomico, Worcester | 45 min |
| Jul 22, 6:06 PM EDT | Severe Thunderstorm Warning | LWX | Anne Arundel, Calvert, Charles, Prince George's | 54 min |
| Jul 23, 2:47 PM EDT | Severe Thunderstorm Warning | PHI | Caroline, Queen Anne's, Talbot | 43 min |
| Jul 23, 3:06 PM EDT | Severe Thunderstorm Warning | LWX | Harford | 39 min |
| Jul 23, 3:44 PM EDT | Severe Thunderstorm Warning | LWX | Harford | 14 min |
| Jul 24, 12:21 AM EDT | Severe Thunderstorm Warning | LWX | Anne Arundel, Prince George's | 39 min |
| Jul 24, 12:58 AM EDT | Severe Thunderstorm Warning | LWX | Anne Arundel | 32 min |
| Jul 24, 1:05 AM EDT | Severe Thunderstorm Warning | PHI | Kent, Queen Anne's | 55 min |
| Jul 24, 1:52 AM EDT | Severe Thunderstorm Warning | PHI | Caroline, Kent, Queen Anne's | 53 min |
| Jul 24, 2:02 AM EDT | Severe Thunderstorm Warning | PHI | Cecil | 43 min |
| Jul 24, 5:02 PM EDT | Severe Thunderstorm Warning | LWX | Montgomery | 43 min |
| Jul 24, 7:27 PM EDT | Severe Thunderstorm Warning | LWX | Baltimore, Harford | 48 min |
| Jul 24, 8:07 PM EDT | Severe Thunderstorm Warning | LWX | Baltimore, Carroll, Howard | 38 min |
| Jul 24, 8:08 PM EDT | Severe Thunderstorm Warning | PHI | Cecil | 52 min |
| Jul 24, 8:09 PM EDT | Severe Thunderstorm Warning | LWX | Harford | 36 min |
| Jul 24, 8:25 PM EDT | Severe Thunderstorm Warning | LWX | Baltimore, Carroll, Harford, City of Baltimore | 50 min |
| Jul 24, 9:04 PM EDT | Severe Thunderstorm Warning | LWX | Anne Arundel, Baltimore, Howard, City of Baltimore | 24 min |
| Jul 24, 9:52 PM EDT | Severe Thunderstorm Warning | PHI | Caroline, Kent, Queen Anne's | 38 min |
| Jul 24, 10:06 PM EDT | Severe Thunderstorm Warning | PHI | Caroline, Cecil, Kent, Queen Anne's | 39 min |
| Jul 24, 10:50 PM EDT | Severe Thunderstorm Warning | PHI | Caroline, Queen Anne's | 40 min |
| Jul 25, 12:34 AM EDT | Severe Thunderstorm Warning | PHI | Caroline | 41 min |
| Aug 1, 6:13 PM EDT | Severe Thunderstorm Warning | LWX | Montgomery, Prince George's | 35 min |
| Aug 2, 12:55 PM EDT | Severe Thunderstorm Warning | LWX | Baltimore, Harford | 37 min |
| Aug 2, 2:31 PM EDT | Severe Thunderstorm Warning | LWX | Harford | 44 min |
| Aug 2, 2:52 PM EDT | Severe Thunderstorm Warning | LWX | Baltimore, Harford | 39 min |
| Aug 2, 3:56 PM EDT | Severe Thunderstorm Warning | LWX | Baltimore, Harford | 49 min |
| Aug 2, 6:12 PM EDT | Severe Thunderstorm Warning | LWX | Anne Arundel | 33 min |
| Aug 2, 6:55 PM EDT | Severe Thunderstorm Warning | PHI | Kent, Queen Anne's | 35 min |
| Aug 2, 7:58 PM EDT | Severe Thunderstorm Warning | PHI | Caroline | 47 min |
| Aug 2, 9:12 PM EDT | Severe Thunderstorm Warning | PHI | Caroline, Kent, Queen Anne's | 34 min |
| Aug 3, 4:02 PM EDT | Severe Thunderstorm Warning | LWX | Anne Arundel, Prince George's | 43 min |
| Aug 3, 4:17 PM EDT | Severe Thunderstorm Warning | LWX | Frederick, Washington | 21 min |
| Aug 3, 4:53 PM EDT | Severe Thunderstorm Warning | LWX | Anne Arundel, Baltimore, Howard, City of Baltimore | 52 min |
| Aug 3, 5:20 PM EDT | Severe Thunderstorm Warning | LWX | Baltimore | 40 min |
| Aug 3, 5:35 PM EDT | Severe Thunderstorm Warning | LWX | Baltimore, Carroll, Howard | 40 min |
| Aug 3, 5:37 PM EDT | Severe Thunderstorm Warning | LWX | Baltimore, Harford | 33 min |
| Aug 3, 5:53 PM EDT | Severe Thunderstorm Warning | LWX | Baltimore, Harford | 52 min |
| Aug 3, 5:55 PM EDT | Severe Thunderstorm Warning | LWX | Montgomery | 35 min |
| Aug 3, 6:13 PM EDT | Severe Thunderstorm Warning | LWX | Montgomery | 47 min |
| Aug 3, 6:32 PM EDT | Severe Thunderstorm Warning | LWX | Montgomery, Prince George's | 43 min |
| Aug 3, 6:56 PM EDT | Severe Thunderstorm Warning | LWX | Anne Arundel | 20 min |
| Aug 3, 8:11 PM EDT | Severe Thunderstorm Warning | LWX | Frederick | 26 min |
| Aug 4, 3:50 PM EDT | Severe Thunderstorm Warning | PBZ | Garrett | 40 min |
| Aug 4, 5:03 PM EDT | Severe Thunderstorm Warning | LWX | Allegany | 27 min |
| Aug 4, 5:29 PM EDT | Severe Thunderstorm Warning | LWX | Allegany, Washington | 31 min |
| Aug 4, 5:49 PM EDT | Severe Thunderstorm Warning | LWX | Allegany, Washington | 27 min |
| Aug 4, 9:22 PM EDT | Severe Thunderstorm Warning | LWX | Frederick, Washington | 23 min |
| Aug 4, 9:49 PM EDT | Severe Thunderstorm Warning | LWX | Carroll, Frederick, Washington | 41 min |
| Aug 4, 10:26 PM EDT | Severe Thunderstorm Warning | LWX | Carroll, Frederick, Washington | 49 min |
| Aug 4, 11:10 PM EDT | Severe Thunderstorm Warning | LWX | Baltimore, Carroll | 32 min |
| Aug 7, 1:37 PM EDT | Severe Thunderstorm Warning | AKQ | Wicomico | 53 min |
| Aug 11, 7:40 PM EDT | Severe Thunderstorm Warning | LWX | Charles, Prince George's | 65 min |
| Aug 11, 11:11 PM EDT | Severe Thunderstorm Warning | PHI | Talbot | 49 min |
| Aug 12, 1:45 PM EDT | Severe Thunderstorm Warning | LWX | Allegany, Washington | 28 min |
| Aug 12, 3:26 PM EDT | Severe Thunderstorm Warning | LWX | Allegany, Washington | 39 min |
| Aug 12, 3:50 PM EDT | Severe Thunderstorm Warning | LWX | Washington | 40 min |
| Aug 12, 5:00 PM EDT | Severe Thunderstorm Warning | LWX | Frederick, Washington | 45 min |
| Aug 12, 5:56 PM EDT | Severe Thunderstorm Warning | LWX | Carroll, Frederick, Howard, Montgomery | 49 min |
| Aug 12, 5:58 PM EDT | Severe Thunderstorm Warning | LWX | Frederick, Montgomery | 47 min |
| Aug 12, 6:30 PM EDT | Severe Thunderstorm Warning | LWX | Montgomery | 17 min |
| Aug 12, 7:19 PM EDT | Severe Thunderstorm Warning | LWX | Anne Arundel, Baltimore, Howard, City of Baltimore | 41 min |
| Aug 12, 7:32 PM EDT | Severe Thunderstorm Warning | LWX | Montgomery, Prince George's | 43 min |
| Aug 12, 7:56 PM EDT | Severe Thunderstorm Warning | LWX | Anne Arundel | 49 min |
| Aug 12, 8:09 PM EDT | Severe Thunderstorm Warning | LWX | Anne Arundel, Calvert, Prince George's | 66 min |
| Aug 18, 4:29 PM EDT | Severe Thunderstorm Warning | PHI | Cecil | 61 min |
| Aug 18, 4:35 PM EDT | Severe Thunderstorm Warning | LWX | Baltimore, Harford | 55 min |
| Aug 18, 5:03 PM EDT | Severe Thunderstorm Warning | PHI | Cecil, Kent | 42 min |
| Aug 18, 5:14 PM EDT | Severe Thunderstorm Warning | LWX | Anne Arundel, Baltimore, Harford, Howard, City of Baltimore | 91 min |
| Aug 18, 5:29 PM EDT | Severe Thunderstorm Warning | LWX | Charles | 46 min |
| Aug 18, 5:32 PM EDT | Severe Thunderstorm Warning | LWX | Anne Arundel, Howard, Montgomery, Prince George's | 73 min |
| Aug 18, 5:39 PM EDT | Severe Thunderstorm Warning | PHI | Cecil, Kent | 66 min |
| Aug 18, 5:59 PM EDT | Severe Thunderstorm Warning | LWX | Calvert, Charles, Prince George's, Saint Mary's | 46 min |
| Aug 18, 6:10 PM EDT | Severe Thunderstorm Warning | PHI | Caroline, Kent, Queen Anne's, Talbot | 65 min |
| Aug 18, 6:42 PM EDT | Severe Thunderstorm Warning | LWX | Calvert, Charles, Saint Mary's | 63 min |
| Aug 18, 7:07 PM EDT | Severe Thunderstorm Warning | PHI | Caroline, Kent, Queen Anne's, Talbot | 53 min |
| Aug 18, 7:51 PM EDT | Severe Thunderstorm Warning | LWX | Calvert, Charles, Saint Mary's | 84 min |
| Aug 18, 7:53 PM EDT | Severe Thunderstorm Warning | PHI | Caroline, Kent, Queen Anne's, Talbot | 48 min |
| Aug 18, 9:17 PM EDT | Severe Thunderstorm Warning | AKQ | Somerset, Wicomico, Worcester | 43 min |
| Aug 19, 8:35 PM EDT | Severe Thunderstorm Warning | LWX | Carroll, Frederick | 40 min |
| Aug 19, 10:51 PM EDT | Severe Thunderstorm Warning | LWX | Anne Arundel, Calvert, Charles, Prince George's | 39 min |
| Aug 21, 3:09 PM EDT | Severe Thunderstorm Warning | LWX | Baltimore, Harford | 51 min |
| Aug 21, 3:44 PM EDT | Severe Thunderstorm Warning | LWX | Charles | 46 min |
| Aug 21, 4:51 PM EDT | Severe Thunderstorm Warning | LWX | Charles, Saint Mary's | 39 min |
| Aug 21, 5:29 PM EDT | Severe Thunderstorm Warning | LWX | Saint Mary's | 34 min |
| Aug 21, 5:47 PM EDT | Severe Thunderstorm Warning | LWX | Anne Arundel, Baltimore | 43 min |
| Aug 21, 7:56 PM EDT | Severe Thunderstorm Warning | LWX | Carroll, Frederick, Washington | 49 min |
| Aug 21, 8:41 PM EDT | Severe Thunderstorm Warning | LWX | Frederick | 27 min |
| Aug 22, 10:07 PM EDT | Severe Thunderstorm Warning | PHI | Cecil, Kent | 53 min |
| Aug 22, 10:14 PM EDT | Severe Thunderstorm Warning | LWX | Harford | 21 min |
| Aug 22, 10:58 PM EDT | Severe Thunderstorm Warning | PHI | Cecil, Kent | 62 min |
| Sep 5, 2:38 PM EDT | Severe Thunderstorm Warning | LWX | Allegany, Washington | 22 min |
| Sep 5, 2:49 PM EDT | Severe Thunderstorm Warning | LWX | Washington | 41 min |
| Sep 5, 3:20 PM EDT | Severe Thunderstorm Warning | LWX | Frederick, Washington | 40 min |
| Sep 5, 3:51 PM EDT | Severe Thunderstorm Warning | LWX | Carroll, Frederick, Washington | 39 min |
By county
Every county with at least one alert. A county page lists each alert that covered it.
- Prince George's County50
- Montgomery County45
- Anne Arundel County42
- Caroline County39
- Baltimore County35
- Queen Anne's County34
- Frederick County33
- Howard County30
- Kent County30
- Charles County29
- Washington County28
- Talbot County27
- Carroll County26
- Cecil County24
- Calvert County22
- Saint Mary's County22
- Harford County21
- City of Baltimore14
- Allegany County13
- Garrett County12
- Dorchester County12
- Wicomico County11
- Somerset County5
- Worcester County5
The busiest days
Days with the most alerts issued, by UTC date.
Nearby
Alerts in force nowTornadoes on recordThe radar archive20162018
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.