Alert archive / Maryland / Severe Thunderstorm Warnings
Severe Thunderstorm Warnings in Maryland, 2012
263 severe thunderstorm warnings in 2012. 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 2012. Tap one for its archive.
- Severe Thunderstorm Warnings
- 263
- Busiest month
- July78 severe thunderstorm warnings
- Busiest day
- June 1, 201221 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.
197 of 263 severe thunderstorm warnings covering Maryland in 2012 had a qualifying storm report inside them; 409 of 465 hail, wind and damage reports fell inside a warning, on average 28 minutes after it went out.
Maryland, 2012
| Warnings | With a report | False alarm ratio | Reports | Inside a warning | Mean lead time | |
|---|---|---|---|---|---|---|
| Severe thunderstorm warnings | 263 | 197 | 25% | 465 | 88% | 28 min |
Each office's whole area, 2012
| Warnings | With a report | False alarm ratio | Reports | Inside a warning | Mean lead time | |
|---|---|---|---|---|---|---|
| NWS Baltimore/Washington: severe thunderstorm warnings | 365 | 286 | 22% | 1,001 | 90% | 26 min |
| NWS Pittsburgh, PA: severe thunderstorm warnings | 209 | 165 | 21% | 502 | 80% | 26 min |
| NWS Wakefield, VA: severe thunderstorm warnings | 180 | 120 | 33% | 288 | 83% | 24 min |
| NWS Philadelphia/Mount Holly: severe thunderstorm warnings | 238 | 159 | 33% | 410 | 90% | 28 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 24, 2:47 PM EST | Severe Thunderstorm Warning | LWX | Anne Arundel, Charles, Prince George's, Saint Mary's | 43 min |
| Feb 24, 3:09 PM EST | Severe Thunderstorm Warning | LWX | Charles, Saint Mary's | 51 min |
| Feb 24, 3:29 PM EST | Severe Thunderstorm Warning | PHI | Caroline, Queen Anne's, Talbot | 46 min |
| Feb 24, 3:30 PM EST | Severe Thunderstorm Warning | AKQ | Dorchester, Wicomico | 45 min |
| Feb 24, 4:14 PM EST | Severe Thunderstorm Warning | AKQ | Dorchester, Somerset, Wicomico, Worcester | 46 min |
| Feb 24, 4:56 PM EST | Severe Thunderstorm Warning | AKQ | Somerset, Wicomico, Worcester | 49 min |
| Feb 24, 5:13 PM EST | Severe Thunderstorm Warning | AKQ | Somerset, Worcester | 32 min |
| Mar 28, 2:00 PM EDT | Severe Thunderstorm Warning | PBZ | Garrett | 30 min |
| May 2, 6:06 PM EDT | Severe Thunderstorm Warning | LWX | Frederick, Washington | 39 min |
| May 3, 7:34 PM EDT | Severe Thunderstorm Warning | LWX | Washington | 41 min |
| May 3, 7:56 PM EDT | Severe Thunderstorm Warning | LWX | Washington | 49 min |
| May 3, 8:28 PM EDT | Severe Thunderstorm Warning | LWX | Washington | 26 min |
| May 3, 9:57 PM EDT | Severe Thunderstorm Warning | LWX | Frederick, Montgomery | 48 min |
| May 3, 9:58 PM EDT | Severe Thunderstorm Warning | LWX | Baltimore, Carroll, Howard | 22 min |
| May 4, 12:36 PM EDT | Severe Thunderstorm Warning | LWX | Anne Arundel, Prince George's | 24 min |
| May 4, 12:56 PM EDT | Severe Thunderstorm Warning | PHI | Kent, Queen Anne's, Talbot | 15 min |
| May 4, 12:59 PM EDT | Severe Thunderstorm Warning | LWX | Anne Arundel | 9 min |
| May 15, 9:24 PM EDT | Severe Thunderstorm Warning | LWX | Anne Arundel, Charles, Prince George's | 13 min |
| May 26, 7:17 PM EDT | Severe Thunderstorm Warning | LWX | Allegany, Washington | 43 min |
| May 27, 7:25 PM EDT | Severe Thunderstorm Warning | LWX | Allegany, Frederick, Washington | 50 min |
| May 27, 8:08 PM EDT | Severe Thunderstorm Warning | LWX | Frederick, Montgomery, Washington | 37 min |
| May 29, 3:58 PM EDT | Severe Thunderstorm Warning | LWX | Washington | 47 min |
| May 29, 4:09 PM EDT | Severe Thunderstorm Warning | LWX | Allegany | 51 min |
| May 29, 4:34 PM EDT | Severe Thunderstorm Warning | LWX | Allegany | 41 min |
| May 29, 4:53 PM EDT | Severe Thunderstorm Warning | LWX | Washington | 52 min |
| May 29, 5:01 PM EDT | Severe Thunderstorm Warning | LWX | Allegany, Washington | 44 min |
| May 29, 5:26 PM EDT | Severe Thunderstorm Warning | LWX | Frederick, Washington | 49 min |
| May 29, 5:50 PM EDT | Severe Thunderstorm Warning | LWX | Frederick, Washington | 40 min |
| Jun 1, 1:49 PM EDT | Severe Thunderstorm Warning | LWX | Frederick, Montgomery | 41 min |
| Jun 1, 2:05 PM EDT | Severe Thunderstorm Warning | LWX | Carroll, Frederick, Howard, Montgomery | 40 min |
| Jun 1, 2:38 PM EDT | Severe Thunderstorm Warning | LWX | Frederick, Howard, Montgomery | 52 min |
| Jun 1, 2:44 PM EDT | Severe Thunderstorm Warning | LWX | Montgomery | 46 min |
| Jun 1, 2:54 PM EDT | Severe Thunderstorm Warning | LWX | Carroll, Frederick, Howard, Montgomery | 66 min |
| Jun 1, 3:23 PM EDT | Severe Thunderstorm Warning | LWX | Anne Arundel, Howard, Montgomery, Prince George's | 52 min |
| Jun 1, 3:47 PM EDT | Severe Thunderstorm Warning | LWX | Charles, Prince George's | 43 min |
| Jun 1, 4:13 PM EDT | Severe Thunderstorm Warning | LWX | Anne Arundel, Howard, Montgomery, Prince George's | 32 min |
| Jun 1, 4:22 PM EDT | Severe Thunderstorm Warning | LWX | Baltimore, Carroll | 23 min |
| Jun 1, 4:29 PM EDT | Severe Thunderstorm Warning | LWX | Charles, Prince George's | 46 min |
| Jun 1, 4:46 PM EDT | Severe Thunderstorm Warning | LWX | Saint Mary's | 44 min |
| Jun 1, 4:49 PM EDT | Severe Thunderstorm Warning | LWX | Anne Arundel, Prince George's | 41 min |
| Jun 1, 4:51 PM EDT | Severe Thunderstorm Warning | LWX | Anne Arundel, Baltimore, Harford, City of Baltimore | 39 min |
| Jun 1, 5:22 PM EDT | Severe Thunderstorm Warning | LWX | Baltimore, Harford | 38 min |
| Jun 1, 5:49 PM EDT | Severe Thunderstorm Warning | LWX | Allegany | 41 min |
| Jun 1, 6:17 PM EDT | Severe Thunderstorm Warning | PHI | Cecil | 44 min |
| Jun 1, 6:29 PM EDT | Severe Thunderstorm Warning | LWX | Allegany, Washington | 46 min |
| Jun 1, 7:15 PM EDT | Severe Thunderstorm Warning | LWX | Anne Arundel, Baltimore, Howard, City of Baltimore | 26 min |
| Jun 1, 7:20 PM EDT | Severe Thunderstorm Warning | LWX | Washington | 40 min |
| Jun 1, 7:29 PM EDT | Severe Thunderstorm Warning | LWX | Calvert, Charles, Prince George's, Saint Mary's | 31 min |
| Jun 1, 7:35 PM EDT | Severe Thunderstorm Warning | LWX | Anne Arundel, Baltimore, Harford, City of Baltimore | 40 min |
| Jun 1, 8:07 PM EDT | Severe Thunderstorm Warning | PHI | Queen Anne's | 41 min |
| Jun 1, 8:30 PM EDT | Severe Thunderstorm Warning | PHI | Cecil, Kent, Queen Anne's | 60 min |
| Jun 1, 8:43 PM EDT | Severe Thunderstorm Warning | LWX | Harford | 17 min |
| Jun 1, 8:46 PM EDT | Severe Thunderstorm Warning | LWX | Baltimore, Carroll, Frederick, Howard, Montgomery | 44 min |
| Jun 1, 8:51 PM EDT | Severe Thunderstorm Warning | LWX | Charles, Prince George's | 39 min |
| Jun 1, 9:09 PM EDT | Severe Thunderstorm Warning | PHI | Kent, Queen Anne's, Talbot | 66 min |
| Jun 1, 10:10 PM EDT | Severe Thunderstorm Warning | PHI | Cecil, Kent, Queen Anne's | 65 min |
| Jun 3, 6:39 PM EDT | Severe Thunderstorm Warning | LWX | Baltimore, Carroll, Harford | 53 min |
| Jun 7, 3:53 PM EDT | Severe Thunderstorm Warning | LWX | Washington | 23 min |
| Jun 12, 9:49 PM EDT | Severe Thunderstorm Warning | PBZ | Garrett | 41 min |
| Jun 22, 1:40 PM EDT | Severe Thunderstorm Warning | PBZ | Garrett | 35 min |
| Jun 22, 4:02 PM EDT | Severe Thunderstorm Warning | LWX | Charles | 28 min |
| Jun 22, 4:08 PM EDT | Severe Thunderstorm Warning | LWX | Washington | 52 min |
| Jun 22, 4:36 PM EDT | Severe Thunderstorm Warning | LWX | Calvert | 24 min |
| Jun 22, 4:39 PM EDT | Severe Thunderstorm Warning | LWX | Frederick, Washington | 51 min |
| Jun 22, 4:48 PM EDT | Severe Thunderstorm Warning | LWX | Washington | 42 min |
| Jun 22, 5:20 PM EDT | Severe Thunderstorm Warning | LWX | Carroll, Frederick | 40 min |
| Jun 22, 5:23 PM EDT | Severe Thunderstorm Warning | LWX | Calvert, Saint Mary's | 52 min |
| Jun 22, 5:47 PM EDT | Severe Thunderstorm Warning | LWX | Baltimore, Carroll, Frederick | 43 min |
| Jun 22, 5:55 PM EDT | Severe Thunderstorm Warning | LWX | Harford | 40 min |
| Jun 22, 6:10 PM EDT | Severe Thunderstorm Warning | LWX | Montgomery | 50 min |
| Jun 22, 6:13 PM EDT | Severe Thunderstorm Warning | PHI | Cecil | 62 min |
| Jun 22, 6:23 PM EDT | Severe Thunderstorm Warning | LWX | Baltimore, Carroll, Harford, City of Baltimore | 37 min |
| Jun 22, 6:57 PM EDT | Severe Thunderstorm Warning | LWX | Montgomery | 48 min |
| Jun 22, 7:06 PM EDT | Severe Thunderstorm Warning | PHI | Cecil | 54 min |
| Jun 22, 7:29 PM EDT | Severe Thunderstorm Warning | LWX | Howard, Montgomery, Prince George's | 46 min |
| Jun 22, 7:43 PM EDT | Severe Thunderstorm Warning | LWX | Anne Arundel, Montgomery, Prince George's | 47 min |
| Jun 22, 7:57 PM EDT | Severe Thunderstorm Warning | PHI | Cecil, Kent | 69 min |
| Jun 25, 10:20 AM EDT | Severe Thunderstorm Warning | AKQ | Wicomico, Worcester | 55 min |
| Jun 29, 4:20 AM EDT | Severe Thunderstorm Warning | LWX | Carroll, Frederick, Washington | 40 min |
| Jun 29, 4:37 AM EDT | Severe Thunderstorm Warning | LWX | Baltimore, Carroll, Harford | 38 min |
| Jun 29, 4:46 AM EDT | Severe Thunderstorm Warning | PHI | Cecil | 48 min |
| Jun 29, 4:52 AM EDT | Severe Thunderstorm Warning | LWX | Baltimore, Carroll, Harford | 38 min |
| Jun 29, 5:03 AM EDT | Severe Thunderstorm Warning | LWX | Baltimore, Harford, City of Baltimore | 42 min |
| Jun 29, 5:23 AM EDT | Severe Thunderstorm Warning | PHI | Caroline, Cecil, Kent, Queen Anne's, Talbot | 67 min |
| Jun 29, 7:51 PM EDT | Severe Thunderstorm Warning | PBZ | Garrett | 54 min |
| Jun 29, 8:15 PM EDT | Severe Thunderstorm Warning | LWX | Allegany | 75 min |
| Jun 29, 8:30 PM EDT | Severe Thunderstorm Warning | PBZ | Garrett | 40 min |
| Jun 29, 8:53 PM EDT | Severe Thunderstorm Warning | LWX | Frederick, Washington | 35 min |
| Jun 29, 9:08 PM EDT | Severe Thunderstorm Warning | LWX | Allegany, Washington | 67 min |
| Jun 29, 9:34 PM EDT | Severe Thunderstorm Warning | LWX | Allegany, Carroll, Frederick, Montgomery, Washington | 56 min |
| Jun 29, 9:46 PM EDT | Severe Thunderstorm Warning | LWX | Montgomery | 59 min |
| Jun 29, 10:10 PM EDT | Severe Thunderstorm Warning | LWX | Anne Arundel, Charles, Frederick, Howard, Montgomery, Prince George's | 65 min |
| Jun 29, 10:17 PM EDT | Severe Thunderstorm Warning | LWX | Anne Arundel, Baltimore, Carroll, Frederick, Harford, Howard and 1 more | 58 min |
| Jun 29, 10:42 PM EDT | Severe Thunderstorm Warning | LWX | Anne Arundel, Calvert, Charles, Howard, Montgomery, Prince George's and 1 more | 78 min |
| Jun 29, 10:51 PM EDT | Severe Thunderstorm Warning | AKQ | Dorchester | 69 min |
| Jun 29, 11:03 PM EDT | Severe Thunderstorm Warning | PHI | Caroline, Kent, Queen Anne's, Talbot | 72 min |
| Jun 29, 11:07 PM EDT | Severe Thunderstorm Warning | LWX | Anne Arundel, Baltimore, Carroll, Harford, Howard, City of Baltimore | 53 min |
| Jun 29, 11:36 PM EDT | Severe Thunderstorm Warning | LWX | Calvert, Saint Mary's | 39 min |
| Jun 29, 11:40 PM EDT | Severe Thunderstorm Warning | AKQ | Dorchester, Somerset, Wicomico, Worcester | 50 min |
| Jun 29, 11:45 PM EDT | Severe Thunderstorm Warning | PHI | Cecil, Kent | 60 min |
| Jun 29, 11:53 PM EDT | Severe Thunderstorm Warning | LWX | Baltimore, Harford | 23 min |
| Jun 30, 12:33 AM EDT | Severe Thunderstorm Warning | AKQ | Somerset, Wicomico, Worcester | 42 min |
| Jul 2, 4:47 AM EDT | Severe Thunderstorm Warning | AKQ | Dorchester, Somerset, Wicomico | 43 min |
| Jul 3, 5:30 PM EDT | Severe Thunderstorm Warning | PBZ | Garrett | 47 min |
| Jul 3, 6:05 PM EDT | Severe Thunderstorm Warning | LWX | Allegany | 40 min |
| Jul 3, 6:07 PM EDT | Severe Thunderstorm Warning | LWX | Frederick, Washington | 38 min |
| Jul 3, 6:43 PM EDT | Severe Thunderstorm Warning | LWX | Frederick, Washington | 18 min |
| Jul 3, 8:01 PM EDT | Severe Thunderstorm Warning | LWX | Montgomery | 29 min |
| Jul 4, 7:03 PM EDT | Severe Thunderstorm Warning | PBZ | Garrett | 57 min |
| Jul 4, 7:28 PM EDT | Severe Thunderstorm Warning | LWX | Allegany | 47 min |
| Jul 4, 7:56 PM EDT | Severe Thunderstorm Warning | LWX | Allegany, Washington | 49 min |
| Jul 4, 8:20 PM EDT | Severe Thunderstorm Warning | LWX | Washington | 40 min |
| Jul 4, 8:53 PM EDT | Severe Thunderstorm Warning | LWX | Washington | 52 min |
| Jul 5, 2:48 AM EDT | Severe Thunderstorm Warning | LWX | Charles | 42 min |
| Jul 5, 3:25 AM EDT | Severe Thunderstorm Warning | LWX | Charles | 39 min |
| Jul 5, 3:46 AM EDT | Severe Thunderstorm Warning | LWX | Charles, Saint Mary's | 22 min |
| Jul 5, 7:36 PM EDT | Severe Thunderstorm Warning | PHI | Kent, Queen Anne's | 39 min |
| Jul 5, 8:14 PM EDT | Severe Thunderstorm Warning | PHI | Caroline, Kent, Queen Anne's, Talbot | 46 min |
| Jul 8, 1:30 PM EDT | Severe Thunderstorm Warning | LWX | Washington | 45 min |
| Jul 8, 2:17 PM EDT | Severe Thunderstorm Warning | LWX | Frederick, Washington | 43 min |
| Jul 8, 2:53 PM EDT | Severe Thunderstorm Warning | LWX | Montgomery | 52 min |
| Jul 8, 3:14 PM EDT | Severe Thunderstorm Warning | LWX | Washington | 34 min |
| Jul 8, 3:44 PM EDT | Severe Thunderstorm Warning | LWX | Montgomery | 46 min |
| Jul 8, 4:14 PM EDT | Severe Thunderstorm Warning | LWX | Charles, Montgomery, Prince George's | 46 min |
| Jul 8, 4:42 PM EDT | Severe Thunderstorm Warning | LWX | Charles, Prince George's | 48 min |
| Jul 8, 5:06 PM EDT | Severe Thunderstorm Warning | LWX | Charles | 69 min |
| Jul 8, 5:23 PM EDT | Severe Thunderstorm Warning | LWX | Calvert, Charles, Saint Mary's | 52 min |
| Jul 8, 6:07 PM EDT | Severe Thunderstorm Warning | LWX | Calvert, Charles, Saint Mary's | 68 min |
| Jul 8, 7:16 PM EDT | Severe Thunderstorm Warning | AKQ | Dorchester, Somerset, Wicomico | 44 min |
| Jul 8, 9:22 PM EDT | Severe Thunderstorm Warning | PHI | Caroline, Queen Anne's, Talbot | 53 min |
| Jul 8, 10:15 PM EDT | Severe Thunderstorm Warning | PHI | Caroline, Queen Anne's | 25 min |
| Jul 8, 11:48 PM EDT | Severe Thunderstorm Warning | LWX | Prince George's | 31 min |
| Jul 15, 8:30 PM EDT | Severe Thunderstorm Warning | PHI | Cecil | 45 min |
| Jul 18, 2:04 PM EDT | Severe Thunderstorm Warning | LWX | Washington | 41 min |
| Jul 18, 2:50 PM EDT | Severe Thunderstorm Warning | LWX | Washington | 40 min |
| Jul 18, 2:57 PM EDT | Severe Thunderstorm Warning | LWX | Carroll, Frederick, Washington | 48 min |
| Jul 18, 3:15 PM EDT | Severe Thunderstorm Warning | LWX | Carroll, Frederick | 45 min |
| Jul 18, 3:20 PM EDT | Severe Thunderstorm Warning | LWX | Allegany | 40 min |
| Jul 18, 3:24 PM EDT | Severe Thunderstorm Warning | LWX | Frederick, Washington | 30 min |
| Jul 18, 4:19 PM EDT | Severe Thunderstorm Warning | LWX | Anne Arundel, Montgomery, Prince George's | 41 min |
| Jul 18, 4:29 PM EDT | Severe Thunderstorm Warning | LWX | Anne Arundel, Howard, Montgomery, Prince George's | 46 min |
| Jul 18, 4:53 PM EDT | Severe Thunderstorm Warning | LWX | Anne Arundel, Howard, Montgomery, Prince George's | 52 min |
| Jul 18, 5:02 PM EDT | Severe Thunderstorm Warning | LWX | Prince George's | 20 min |
| Jul 18, 5:35 PM EDT | Severe Thunderstorm Warning | PHI | Kent, Queen Anne's | 25 min |
| Jul 18, 6:06 PM EDT | Severe Thunderstorm Warning | PHI | Caroline, Kent, Queen Anne's, Talbot | 39 min |
| Jul 18, 6:23 PM EDT | Severe Thunderstorm Warning | PHI | Caroline, Queen Anne's, Talbot | 37 min |
| Jul 19, 6:32 PM EDT | Severe Thunderstorm Warning | LWX | Washington | 43 min |
| Jul 19, 6:47 PM EDT | Severe Thunderstorm Warning | LWX | Anne Arundel, Baltimore, Howard, City of Baltimore | 43 min |
| Jul 19, 9:20 PM EDT | Severe Thunderstorm Warning | LWX | Frederick, Howard, Montgomery, Prince George's | 40 min |
| Jul 19, 9:34 PM EDT | Severe Thunderstorm Warning | LWX | Charles, Montgomery, Prince George's | 41 min |
| Jul 19, 11:16 PM EDT | Severe Thunderstorm Warning | LWX | Anne Arundel, Calvert, Prince George's | 29 min |
| Jul 24, 11:24 AM EDT | Severe Thunderstorm Warning | PBZ | Garrett | 51 min |
| Jul 24, 11:38 AM EDT | Severe Thunderstorm Warning | LWX | Allegany | 52 min |
| Jul 24, 4:23 PM EDT | Severe Thunderstorm Warning | LWX | Frederick | 37 min |
| Jul 24, 5:24 PM EDT | Severe Thunderstorm Warning | LWX | Anne Arundel, Baltimore, City of Baltimore | 26 min |
| Jul 24, 5:27 PM EDT | Severe Thunderstorm Warning | LWX | Montgomery | 21 min |
| Jul 26, 6:37 PM EDT | Severe Thunderstorm Warning | PBZ | Garrett | 68 min |
| Jul 26, 7:13 PM EDT | Severe Thunderstorm Warning | LWX | Allegany | 47 min |
| Jul 26, 7:25 PM EDT | Severe Thunderstorm Warning | PBZ | Garrett | 80 min |
| Jul 26, 7:57 PM EDT | Severe Thunderstorm Warning | LWX | Allegany, Washington | 48 min |
| Jul 26, 8:31 PM EDT | Severe Thunderstorm Warning | LWX | Baltimore, Carroll, Frederick, Harford | 44 min |
| Jul 26, 9:26 PM EDT | Severe Thunderstorm Warning | LWX | Baltimore, Carroll, Harford, Howard, City of Baltimore | 49 min |
| Jul 28, 3:54 PM EDT | Severe Thunderstorm Warning | LWX | Harford | 51 min |
| Jul 28, 4:10 PM EDT | Severe Thunderstorm Warning | PHI | Cecil | 65 min |
| Jul 28, 4:42 PM EDT | Severe Thunderstorm Warning | LWX | Harford | 48 min |
| Jul 28, 5:42 PM EDT | Severe Thunderstorm Warning | LWX | Anne Arundel, Calvert, Prince George's | 30 min |
| Jul 28, 5:49 PM EDT | Severe Thunderstorm Warning | LWX | Charles, Prince George's | 41 min |
| Jul 28, 6:31 PM EDT | Severe Thunderstorm Warning | LWX | Anne Arundel, Calvert, Charles, Prince George's | 32 min |
| Jul 28, 6:41 PM EDT | Severe Thunderstorm Warning | PHI | Queen Anne's, Talbot | 64 min |
| Jul 28, 7:22 PM EDT | Severe Thunderstorm Warning | PHI | Caroline, Talbot | 53 min |
| Jul 28, 7:34 PM EDT | Severe Thunderstorm Warning | AKQ | Dorchester | 41 min |
| Jul 28, 7:56 PM EDT | Severe Thunderstorm Warning | LWX | Anne Arundel, Calvert, Prince George's | 49 min |
| Jul 28, 7:57 PM EDT | Severe Thunderstorm Warning | PHI | Cecil | 48 min |
| Jul 28, 8:04 PM EDT | Severe Thunderstorm Warning | AKQ | Dorchester, Wicomico | 41 min |
| Jul 28, 8:09 PM EDT | Severe Thunderstorm Warning | PHI | Caroline | 66 min |
| Jul 28, 8:10 PM EDT | Severe Thunderstorm Warning | LWX | Anne Arundel, Prince George's | 37 min |
| Jul 31, 12:56 PM EDT | Severe Thunderstorm Warning | PBZ | Garrett | 34 min |
| Jul 31, 1:41 PM EDT | Severe Thunderstorm Warning | PBZ | Garrett | 34 min |
| Jul 31, 4:38 PM EDT | Severe Thunderstorm Warning | LWX | Howard, Montgomery, Prince George's | 52 min |
| Jul 31, 5:04 PM EDT | Severe Thunderstorm Warning | LWX | Frederick, Montgomery | 20 min |
| Aug 2, 2:55 PM EDT | Severe Thunderstorm Warning | LWX | Anne Arundel, Calvert, Prince George's | 18 min |
| Aug 3, 4:58 PM EDT | Severe Thunderstorm Warning | PHI | Cecil | 40 min |
| Aug 5, 3:16 PM EDT | Severe Thunderstorm Warning | LWX | Montgomery | 44 min |
| Aug 5, 3:33 PM EDT | Severe Thunderstorm Warning | LWX | Baltimore, Carroll, Frederick | 42 min |
| Aug 5, 4:29 PM EDT | Severe Thunderstorm Warning | LWX | Anne Arundel, Howard, Montgomery, Prince George's | 46 min |
| Aug 5, 4:36 PM EDT | Severe Thunderstorm Warning | LWX | Baltimore, Harford | 39 min |
| Aug 5, 4:54 PM EDT | Severe Thunderstorm Warning | PHI | Cecil | 51 min |
| Aug 5, 4:59 PM EDT | Severe Thunderstorm Warning | LWX | Anne Arundel, Baltimore, City of Baltimore | 33 min |
| Aug 5, 5:10 PM EDT | Severe Thunderstorm Warning | PHI | Caroline, Cecil, Kent, Queen Anne's, Talbot | 80 min |
| Aug 5, 5:29 PM EDT | Severe Thunderstorm Warning | LWX | Harford | 29 min |
| Aug 5, 5:38 PM EDT | Severe Thunderstorm Warning | PHI | Cecil | 82 min |
| Aug 5, 6:21 PM EDT | Severe Thunderstorm Warning | PHI | Kent, Queen Anne's | 39 min |
| Aug 9, 12:31 PM EDT | Severe Thunderstorm Warning | PBZ | Garrett | 59 min |
| Aug 9, 1:27 PM EDT | Severe Thunderstorm Warning | LWX | Allegany | 48 min |
| Aug 9, 2:24 PM EDT | Severe Thunderstorm Warning | PBZ | Garrett | 51 min |
| Aug 9, 3:49 PM EDT | Severe Thunderstorm Warning | LWX | Allegany | 41 min |
| Aug 9, 4:27 PM EDT | Severe Thunderstorm Warning | LWX | Washington | 48 min |
| Aug 9, 5:17 PM EDT | Severe Thunderstorm Warning | LWX | Baltimore, Carroll, Howard | 43 min |
| Aug 9, 6:59 PM EDT | Severe Thunderstorm Warning | LWX | Howard, Montgomery | 46 min |
| Aug 9, 7:19 PM EDT | Severe Thunderstorm Warning | LWX | Frederick, Montgomery | 41 min |
| Aug 9, 7:44 PM EDT | Severe Thunderstorm Warning | LWX | Carroll, Frederick, Howard, Montgomery | 46 min |
| Aug 10, 8:55 AM EDT | Severe Thunderstorm Warning | PHI | Caroline, Talbot | 65 min |
| Aug 10, 8:59 AM EDT | Severe Thunderstorm Warning | AKQ | Dorchester, Wicomico | 46 min |
| Aug 10, 4:51 PM EDT | Severe Thunderstorm Warning | LWX | Washington | 39 min |
| Aug 10, 5:25 PM EDT | Severe Thunderstorm Warning | LWX | Frederick, Washington | 50 min |
| Aug 11, 5:20 PM EDT | Severe Thunderstorm Warning | LWX | Calvert, Charles, Prince George's, Saint Mary's | 40 min |
| Aug 14, 3:01 PM EDT | Severe Thunderstorm Warning | PHI | Cecil, Kent, Queen Anne's | 38 min |
| Aug 14, 3:41 PM EDT | Severe Thunderstorm Warning | LWX | Allegany | 49 min |
| Aug 14, 4:34 PM EDT | Severe Thunderstorm Warning | LWX | Allegany, Washington | 41 min |
| Aug 14, 7:03 PM EDT | Severe Thunderstorm Warning | LWX | Baltimore, Carroll | 42 min |
| Aug 14, 8:14 PM EDT | Severe Thunderstorm Warning | LWX | Baltimore, Carroll, Harford | 46 min |
| Aug 14, 8:32 PM EDT | Severe Thunderstorm Warning | LWX | Baltimore, Carroll, Howard, City of Baltimore | 43 min |
| Aug 14, 9:13 PM EDT | Severe Thunderstorm Warning | LWX | Baltimore, Harford, City of Baltimore | 47 min |
| Aug 14, 9:54 PM EDT | Severe Thunderstorm Warning | LWX | Baltimore, Harford, City of Baltimore | 51 min |
| Aug 14, 10:03 PM EDT | Severe Thunderstorm Warning | LWX | Baltimore, Harford, City of Baltimore | 42 min |
| Aug 14, 10:14 PM EDT | Severe Thunderstorm Warning | LWX | Baltimore, Carroll, Frederick | 46 min |
| Aug 14, 11:06 PM EDT | Severe Thunderstorm Warning | LWX | Baltimore, Harford | 39 min |
| Aug 14, 11:16 PM EDT | Severe Thunderstorm Warning | LWX | Baltimore, Harford | 34 min |
| Aug 15, 6:55 PM EDT | Severe Thunderstorm Warning | PHI | Caroline, Talbot | 49 min |
| Aug 15, 7:16 PM EDT | Severe Thunderstorm Warning | PHI | Queen Anne's, Talbot | 35 min |
| Aug 17, 9:08 PM EDT | Severe Thunderstorm Warning | PHI | Cecil, Kent, Queen Anne's | 67 min |
| Aug 17, 9:55 PM EDT | Severe Thunderstorm Warning | PHI | Caroline, Queen Anne's, Talbot | 65 min |
| Aug 26, 1:52 PM EDT | Severe Thunderstorm Warning | LWX | Anne Arundel, Baltimore, Howard, City of Baltimore | 53 min |
| Aug 26, 2:22 PM EDT | Severe Thunderstorm Warning | PHI | Caroline, Queen Anne's, Talbot | 53 min |
| Aug 26, 2:31 PM EDT | Severe Thunderstorm Warning | LWX | Frederick, Montgomery | 30 min |
| Aug 26, 3:15 PM EDT | Severe Thunderstorm Warning | PHI | Talbot | 25 min |
| Aug 26, 5:36 PM EDT | Severe Thunderstorm Warning | PHI | Caroline, Queen Anne's, Talbot | 39 min |
| Aug 26, 7:39 PM EDT | Severe Thunderstorm Warning | PHI | Caroline, Talbot | 66 min |
| Sep 1, 3:54 PM EDT | Severe Thunderstorm Warning | LWX | Washington | 51 min |
| Sep 1, 5:21 PM EDT | Severe Thunderstorm Warning | LWX | Carroll, Frederick | 39 min |
| Sep 1, 6:42 PM EDT | Severe Thunderstorm Warning | LWX | Baltimore, City of Baltimore | 63 min |
| Sep 1, 7:19 PM EDT | Severe Thunderstorm Warning | LWX | Carroll | 9 min |
| Sep 1, 8:07 PM EDT | Severe Thunderstorm Warning | PHI | Kent, Queen Anne's | 38 min |
| Sep 1, 9:43 PM EDT | Severe Thunderstorm Warning | LWX | Anne Arundel, Calvert, Charles, Prince George's | 46 min |
| Sep 8, 12:02 PM EDT | Severe Thunderstorm Warning | LWX | Washington | 43 min |
| Sep 8, 12:35 PM EDT | Severe Thunderstorm Warning | LWX | Frederick, Washington | 40 min |
| Sep 8, 1:09 PM EDT | Severe Thunderstorm Warning | LWX | Carroll, Frederick, Washington | 66 min |
| Sep 8, 2:10 PM EDT | Severe Thunderstorm Warning | LWX | Baltimore, Carroll, Frederick, Harford, Howard, Montgomery | 80 min |
| Sep 8, 2:47 PM EDT | Severe Thunderstorm Warning | LWX | Montgomery | 58 min |
| Sep 8, 3:22 PM EDT | Severe Thunderstorm Warning | LWX | Anne Arundel, Charles, Howard, Montgomery, Prince George's | 68 min |
| Sep 8, 3:58 PM EDT | Severe Thunderstorm Warning | LWX | Anne Arundel, Baltimore, Calvert, Charles, Howard, Montgomery and 3 more | 55 min |
| Sep 8, 4:30 PM EDT | Severe Thunderstorm Warning | PHI | Caroline, Kent, Queen Anne's, Talbot | 60 min |
| Sep 18, 11:13 AM EDT | Severe Thunderstorm Warning | LWX | Frederick, Washington | 47 min |
| Sep 18, 12:19 PM EDT | Severe Thunderstorm Warning | LWX | Carroll, Frederick | 41 min |
| Sep 18, 12:29 PM EDT | Severe Thunderstorm Warning | LWX | Frederick, Washington | 61 min |
| Sep 18, 1:10 PM EDT | Severe Thunderstorm Warning | LWX | Carroll, Frederick | 54 min |
| Sep 18, 1:54 PM EDT | Severe Thunderstorm Warning | LWX | Frederick, Montgomery | 66 min |
| Sep 18, 2:18 PM EDT | Severe Thunderstorm Warning | LWX | Montgomery | 57 min |
| Sep 18, 2:38 PM EDT | Severe Thunderstorm Warning | LWX | Baltimore, Carroll, Frederick, Howard, Montgomery | 52 min |
| Sep 18, 3:09 PM EDT | Severe Thunderstorm Warning | LWX | Anne Arundel, Montgomery, Prince George's | 66 min |
| Sep 18, 3:24 PM EDT | Severe Thunderstorm Warning | LWX | Anne Arundel, Baltimore, Carroll, Harford, Howard, Montgomery and 2 more | 66 min |
| Sep 18, 3:25 PM EDT | Severe Thunderstorm Warning | LWX | Anne Arundel, Calvert, Charles, Prince George's, Saint Mary's | 65 min |
| Sep 18, 3:32 PM EDT | Severe Thunderstorm Warning | LWX | Baltimore, Harford | 28 min |
| Sep 18, 3:39 PM EDT | Severe Thunderstorm Warning | LWX | Calvert, Charles, Saint Mary's | 47 min |
| Sep 18, 3:51 PM EDT | Severe Thunderstorm Warning | PHI | Cecil, Kent, Queen Anne's | 84 min |
| Sep 18, 4:22 PM EDT | Severe Thunderstorm Warning | LWX | Anne Arundel, Calvert | 23 min |
| Sep 18, 4:42 PM EDT | Severe Thunderstorm Warning | PHI | Caroline, Queen Anne's, Talbot | 78 min |
| Sep 18, 5:57 PM EDT | Severe Thunderstorm Warning | PHI | Caroline | 78 min |
| Sep 18, 6:20 PM EDT | Severe Thunderstorm Warning | AKQ | Dorchester, Somerset, Wicomico, Worcester | 40 min |
| Sep 18, 6:56 PM EDT | Severe Thunderstorm Warning | AKQ | Somerset, Wicomico, Worcester | 34 min |
| Sep 27, 7:08 PM EDT | Severe Thunderstorm Warning | LWX | Montgomery | 37 min |
| Oct 18, 9:55 PM EDT | Severe Thunderstorm Warning | LWX | Carroll, Frederick, Washington | 30 min |
| Oct 18, 10:27 PM EDT | Severe Thunderstorm Warning | LWX | Frederick, Washington | 37 min |
By county
Every county with at least one alert. A county page lists each alert that covered it.
- Washington County48
- Frederick County47
- Montgomery County46
- Baltimore County40
- Prince George's County39
- Anne Arundel County36
- Carroll County35
- Howard County30
- Queen Anne's County28
- Harford County28
- Charles County27
- Talbot County22
- Allegany County21
- Caroline County20
- Kent County19
- City of Baltimore19
- Cecil County19
- Calvert County18
- Saint Mary's County14
- Garrett County14
- Wicomico County12
- Dorchester County10
- Somerset County9
- Worcester County8
The busiest days
Days with the most alerts issued, by UTC date.
Nearby
Alerts in force nowTornadoes on recordThe radar archive20112013
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.