Alert archive / Maryland / Severe Thunderstorm Warnings
Severe Thunderstorm Warnings in Maryland, 2015
192 severe thunderstorm warnings in 2015. 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 2015. Tap one for its archive.
- Severe Thunderstorm Warnings
- 192
- Busiest month
- June104 severe thunderstorm warnings
- Busiest day
- June 23, 201520 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.
121 of 192 severe thunderstorm warnings covering Maryland in 2015 had a qualifying storm report inside them; 221 of 292 hail, wind and damage reports fell inside a warning, on average 19 minutes after it went out.
Maryland, 2015
| Warnings | With a report | False alarm ratio | Reports | Inside a warning | Mean lead time | |
|---|---|---|---|---|---|---|
| Severe thunderstorm warnings | 192 | 121 | 37% | 292 | 76% | 19 min |
Each office's whole area, 2015
| Warnings | With a report | False alarm ratio | Reports | Inside a warning | Mean lead time | |
|---|---|---|---|---|---|---|
| NWS Philadelphia/Mount Holly: severe thunderstorm warnings | 120 | 60 | 50% | 230 | 84% | 24 min |
| NWS Wakefield, VA: severe thunderstorm warnings | 113 | 77 | 32% | 208 | 87% | 23 min |
| NWS Baltimore/Washington: severe thunderstorm warnings | 235 | 153 | 35% | 526 | 75% | 16 min |
| NWS Pittsburgh, PA: severe thunderstorm warnings | 174 | 133 | 24% | 505 | 84% | 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 |
|---|---|---|---|---|
| Apr 9, 6:24 PM EDT | Severe Thunderstorm Warning | PBZ | Garrett | 51 min |
| Apr 10, 7:12 PM EDT | Severe Thunderstorm Warning | AKQ | Somerset, Worcester | 41 min |
| Apr 20, 5:22 PM EDT | Severe Thunderstorm Warning | LWX | Allegany | 23 min |
| Apr 20, 6:59 PM EDT | Severe Thunderstorm Warning | LWX | Washington | 31 min |
| Apr 20, 7:09 PM EDT | Severe Thunderstorm Warning | LWX | Allegany, Washington | 36 min |
| Apr 20, 7:16 PM EDT | Severe Thunderstorm Warning | LWX | Allegany, Washington | 59 min |
| Apr 20, 7:20 PM EDT | Severe Thunderstorm Warning | LWX | Calvert, Charles, Prince George's, Saint Mary's | 25 min |
| Apr 20, 7:42 PM EDT | Severe Thunderstorm Warning | LWX | Charles, Montgomery, Prince George's | 48 min |
| Apr 20, 8:02 PM EDT | Severe Thunderstorm Warning | LWX | Anne Arundel, Howard, Montgomery, Prince George's | 28 min |
| Apr 20, 8:11 PM EDT | Severe Thunderstorm Warning | LWX | Charles | 49 min |
| Apr 20, 8:16 PM EDT | Severe Thunderstorm Warning | LWX | Anne Arundel, Calvert, Charles, Prince George's | 44 min |
| Apr 20, 8:20 PM EDT | Severe Thunderstorm Warning | LWX | Anne Arundel, Baltimore, Howard, Montgomery, Prince George's, City of Baltimore | 25 min |
| Apr 20, 8:24 PM EDT | Severe Thunderstorm Warning | LWX | Washington | 36 min |
| Apr 20, 8:35 PM EDT | Severe Thunderstorm Warning | LWX | Calvert, Charles, Prince George's, Saint Mary's | 35 min |
| Apr 20, 8:52 PM EDT | Severe Thunderstorm Warning | LWX | Anne Arundel, Baltimore, Harford, Howard, Prince George's, City of Baltimore | 38 min |
| Apr 20, 9:28 PM EDT | Severe Thunderstorm Warning | LWX | Anne Arundel, Calvert, Charles, Prince George's, Saint Mary's | 47 min |
| Apr 22, 12:19 PM EDT | Severe Thunderstorm Warning | LWX | Frederick, Washington | 25 min |
| May 6, 2:45 PM EDT | Severe Thunderstorm Warning | LWX | Allegany, Washington | 30 min |
| May 6, 4:04 PM EDT | Severe Thunderstorm Warning | LWX | Montgomery | 23 min |
| May 16, 4:08 PM EDT | Severe Thunderstorm Warning | LWX | Frederick, Washington | 36 min |
| May 16, 4:14 PM EDT | Severe Thunderstorm Warning | LWX | Frederick, Washington | 31 min |
| May 16, 5:02 PM EDT | Severe Thunderstorm Warning | LWX | Montgomery | 43 min |
| May 16, 5:39 PM EDT | Severe Thunderstorm Warning | LWX | Carroll, Howard, Montgomery | 28 min |
| May 16, 5:48 PM EDT | Severe Thunderstorm Warning | LWX | Montgomery, Prince George's | 27 min |
| May 16, 6:45 PM EDT | Severe Thunderstorm Warning | PHI | Cecil, Kent, Queen Anne's | 45 min |
| May 27, 12:50 PM EDT | Severe Thunderstorm Warning | LWX | Frederick, Washington | 40 min |
| May 30, 1:43 PM EDT | Severe Thunderstorm Warning | LWX | Allegany | 19 min |
| May 31, 3:03 PM EDT | Severe Thunderstorm Warning | LWX | Washington | 27 min |
| May 31, 7:54 PM EDT | Severe Thunderstorm Warning | LWX | Baltimore, Carroll | 36 min |
| May 31, 10:06 PM EDT | Severe Thunderstorm Warning | LWX | Frederick, Montgomery, Washington | 24 min |
| Jun 1, 2:59 PM EDT | Severe Thunderstorm Warning | LWX | Saint Mary's | 46 min |
| Jun 1, 5:05 PM EDT | Severe Thunderstorm Warning | LWX | Anne Arundel, Baltimore | 25 min |
| Jun 1, 5:24 PM EDT | Severe Thunderstorm Warning | LWX | Anne Arundel | 36 min |
| Jun 1, 5:35 PM EDT | Severe Thunderstorm Warning | PHI | Cecil, Kent, Queen Anne's | 70 min |
| Jun 1, 6:15 PM EDT | Severe Thunderstorm Warning | LWX | Prince George's | 30 min |
| Jun 1, 6:20 PM EDT | Severe Thunderstorm Warning | LWX | Montgomery | 25 min |
| Jun 1, 6:28 PM EDT | Severe Thunderstorm Warning | LWX | Prince George's | 32 min |
| Jun 1, 6:41 PM EDT | Severe Thunderstorm Warning | LWX | Montgomery | 34 min |
| Jun 1, 6:53 PM EDT | Severe Thunderstorm Warning | PHI | Kent, Queen Anne's | 37 min |
| Jun 1, 9:31 PM EDT | Severe Thunderstorm Warning | LWX | Charles, Saint Mary's | 29 min |
| Jun 1, 11:09 PM EDT | Severe Thunderstorm Warning | AKQ | Dorchester | 22 min |
| Jun 8, 4:18 PM EDT | Severe Thunderstorm Warning | LWX | Washington | 42 min |
| Jun 8, 4:36 PM EDT | Severe Thunderstorm Warning | LWX | Frederick, Washington | 24 min |
| Jun 8, 5:34 PM EDT | Severe Thunderstorm Warning | LWX | Prince George's | 26 min |
| Jun 8, 6:17 PM EDT | Severe Thunderstorm Warning | LWX | Frederick, Montgomery, Washington | 28 min |
| Jun 8, 6:25 PM EDT | Severe Thunderstorm Warning | LWX | Carroll, Frederick | 50 min |
| Jun 8, 6:54 PM EDT | Severe Thunderstorm Warning | LWX | Baltimore, Carroll, Frederick, Howard | 51 min |
| Jun 8, 7:12 PM EDT | Severe Thunderstorm Warning | LWX | Montgomery | 48 min |
| Jun 8, 7:28 PM EDT | Severe Thunderstorm Warning | LWX | Anne Arundel, Baltimore, Harford, Howard, City of Baltimore | 62 min |
| Jun 8, 7:51 PM EDT | Severe Thunderstorm Warning | LWX | Baltimore, Harford, City of Baltimore | 24 min |
| Jun 8, 8:07 PM EDT | Severe Thunderstorm Warning | LWX | Baltimore, Harford, City of Baltimore | 53 min |
| Jun 12, 8:19 PM EDT | Severe Thunderstorm Warning | PBZ | Garrett | 56 min |
| Jun 14, 4:11 PM EDT | Severe Thunderstorm Warning | PHI | Cecil | 38 min |
| Jun 14, 5:24 PM EDT | Severe Thunderstorm Warning | LWX | Anne Arundel, Prince George's | 40 min |
| Jun 14, 5:35 PM EDT | Severe Thunderstorm Warning | LWX | Montgomery, Prince George's | 25 min |
| Jun 14, 8:48 PM EDT | Severe Thunderstorm Warning | LWX | Saint Mary's | 27 min |
| Jun 15, 1:27 AM EDT | Severe Thunderstorm Warning | LWX | Frederick, Washington | 33 min |
| Jun 15, 6:30 PM EDT | Severe Thunderstorm Warning | LWX | Charles | 30 min |
| Jun 15, 8:05 PM EDT | Severe Thunderstorm Warning | LWX | Saint Mary's | 40 min |
| Jun 18, 3:40 PM EDT | Severe Thunderstorm Warning | LWX | Frederick | 35 min |
| Jun 18, 3:53 PM EDT | Severe Thunderstorm Warning | LWX | Frederick, Howard, Montgomery | 40 min |
| Jun 18, 4:00 PM EDT | Severe Thunderstorm Warning | LWX | Montgomery | 30 min |
| Jun 18, 4:30 PM EDT | Severe Thunderstorm Warning | LWX | Montgomery | 30 min |
| Jun 18, 4:51 PM EDT | Severe Thunderstorm Warning | LWX | Montgomery, Prince George's | 39 min |
| Jun 18, 5:11 PM EDT | Severe Thunderstorm Warning | LWX | Anne Arundel, Calvert, Charles, Prince George's | 34 min |
| Jun 18, 5:24 PM EDT | Severe Thunderstorm Warning | LWX | Anne Arundel, Calvert, Prince George's | 36 min |
| Jun 18, 5:32 PM EDT | Severe Thunderstorm Warning | LWX | Anne Arundel, Calvert, Charles, Prince George's, Saint Mary's | 43 min |
| Jun 18, 5:55 PM EDT | Severe Thunderstorm Warning | AKQ | Dorchester | 50 min |
| Jun 18, 6:07 PM EDT | Severe Thunderstorm Warning | LWX | Calvert, Charles, Prince George's, Saint Mary's | 53 min |
| Jun 18, 6:36 PM EDT | Severe Thunderstorm Warning | AKQ | Dorchester, Somerset | 24 min |
| Jun 18, 6:57 PM EDT | Severe Thunderstorm Warning | AKQ | Dorchester, Somerset | 48 min |
| Jun 18, 7:54 PM EDT | Severe Thunderstorm Warning | LWX | Frederick, Washington | 36 min |
| Jun 19, 2:55 AM EDT | Severe Thunderstorm Warning | PHI | Caroline, Kent, Queen Anne's, Talbot | 50 min |
| Jun 20, 2:52 PM EDT | Severe Thunderstorm Warning | PBZ | Garrett | 38 min |
| Jun 20, 4:11 PM EDT | Severe Thunderstorm Warning | PBZ | Garrett | 49 min |
| Jun 20, 4:12 PM EDT | Severe Thunderstorm Warning | LWX | Anne Arundel, Prince George's, City of Baltimore | 33 min |
| Jun 20, 4:32 PM EDT | Severe Thunderstorm Warning | LWX | Allegany | 28 min |
| Jun 20, 4:57 PM EDT | Severe Thunderstorm Warning | LWX | Allegany | 33 min |
| Jun 20, 4:57 PM EDT | Severe Thunderstorm Warning | PBZ | Garrett | 48 min |
| Jun 20, 5:28 PM EDT | Severe Thunderstorm Warning | PHI | Cecil, Kent, Queen Anne's | 47 min |
| Jun 20, 5:57 PM EDT | Severe Thunderstorm Warning | LWX | Allegany, Washington | 33 min |
| Jun 20, 7:00 PM EDT | Severe Thunderstorm Warning | LWX | Frederick | 30 min |
| Jun 20, 7:11 PM EDT | Severe Thunderstorm Warning | LWX | Montgomery, Prince George's | 34 min |
| Jun 20, 7:40 PM EDT | Severe Thunderstorm Warning | LWX | Carroll, Frederick, Montgomery, Washington | 35 min |
| Jun 20, 7:48 PM EDT | Severe Thunderstorm Warning | LWX | Charles, Montgomery, Prince George's | 27 min |
| Jun 20, 8:10 PM EDT | Severe Thunderstorm Warning | LWX | Charles, Howard, Montgomery, Prince George's | 35 min |
| Jun 20, 8:27 PM EDT | Severe Thunderstorm Warning | LWX | Charles | 33 min |
| Jun 20, 9:07 PM EDT | Severe Thunderstorm Warning | LWX | Calvert, Charles, Saint Mary's | 38 min |
| Jun 20, 9:08 PM EDT | Severe Thunderstorm Warning | LWX | Anne Arundel, Baltimore, Harford, Prince George's, City of Baltimore | 37 min |
| Jun 20, 9:26 PM EDT | Severe Thunderstorm Warning | LWX | Anne Arundel, Calvert, Prince George's | 49 min |
| Jun 20, 9:35 PM EDT | Severe Thunderstorm Warning | PHI | Caroline, Talbot | 55 min |
| Jun 20, 9:36 PM EDT | Severe Thunderstorm Warning | AKQ | Dorchester, Somerset, Wicomico | 54 min |
| Jun 20, 9:37 PM EDT | Severe Thunderstorm Warning | LWX | Baltimore, Harford | 23 min |
| Jun 20, 9:49 PM EDT | Severe Thunderstorm Warning | PHI | Cecil | 56 min |
| Jun 20, 9:52 PM EDT | Severe Thunderstorm Warning | LWX | Calvert, Saint Mary's | 38 min |
| Jun 20, 9:57 PM EDT | Severe Thunderstorm Warning | PHI | Caroline, Kent, Queen Anne's | 63 min |
| Jun 20, 10:32 PM EDT | Severe Thunderstorm Warning | PHI | Caroline | 46 min |
| Jun 23, 3:47 PM EDT | Severe Thunderstorm Warning | PBZ | Garrett | 58 min |
| Jun 23, 4:25 PM EDT | Severe Thunderstorm Warning | PBZ | Garrett | 49 min |
| Jun 23, 4:54 PM EDT | Severe Thunderstorm Warning | LWX | Frederick, Washington | 36 min |
| Jun 23, 5:11 PM EDT | Severe Thunderstorm Warning | LWX | Baltimore, Harford | 34 min |
| Jun 23, 5:22 PM EDT | Severe Thunderstorm Warning | LWX | Frederick, Montgomery | 38 min |
| Jun 23, 5:22 PM EDT | Severe Thunderstorm Warning | LWX | Baltimore, Carroll, Howard | 38 min |
| Jun 23, 5:27 PM EDT | Severe Thunderstorm Warning | LWX | Frederick, Howard, Montgomery | 33 min |
| Jun 23, 5:28 PM EDT | Severe Thunderstorm Warning | PHI | Cecil | 47 min |
| Jun 23, 5:38 PM EDT | Severe Thunderstorm Warning | PHI | Cecil | 52 min |
| Jun 23, 5:45 PM EDT | Severe Thunderstorm Warning | LWX | Anne Arundel, Baltimore, Harford, City of Baltimore | 30 min |
| Jun 23, 5:51 PM EDT | Severe Thunderstorm Warning | LWX | Baltimore, Carroll, Frederick | 39 min |
| Jun 23, 6:01 PM EDT | Severe Thunderstorm Warning | LWX | Anne Arundel, Baltimore, Carroll, Frederick, Howard, Montgomery and 2 more | 29 min |
| Jun 23, 6:14 PM EDT | Severe Thunderstorm Warning | LWX | Anne Arundel, Baltimore, Carroll, Harford, City of Baltimore | 31 min |
| Jun 23, 6:27 PM EDT | Severe Thunderstorm Warning | LWX | Anne Arundel, Baltimore, Howard, Montgomery, Prince George's, City of Baltimore | 48 min |
| Jun 23, 6:35 PM EDT | Severe Thunderstorm Warning | LWX | Montgomery | 25 min |
| Jun 23, 6:44 PM EDT | Severe Thunderstorm Warning | PHI | Caroline, Kent, Queen Anne's | 76 min |
| Jun 23, 7:06 PM EDT | Severe Thunderstorm Warning | PHI | Caroline, Queen Anne's, Talbot | 84 min |
| Jun 23, 7:14 PM EDT | Severe Thunderstorm Warning | LWX | Anne Arundel, Calvert, Charles, Prince George's | 46 min |
| Jun 23, 7:35 PM EDT | Severe Thunderstorm Warning | AKQ | Dorchester, Wicomico | 70 min |
| Jun 23, 7:41 PM EDT | Severe Thunderstorm Warning | PHI | Caroline | 65 min |
| Jun 23, 8:00 PM EDT | Severe Thunderstorm Warning | LWX | Anne Arundel, Calvert, Charles, Prince George's, Saint Mary's | 30 min |
| Jun 23, 8:23 PM EDT | Severe Thunderstorm Warning | AKQ | Somerset, Wicomico, Worcester | 52 min |
| Jun 23, 8:30 PM EDT | Severe Thunderstorm Warning | LWX | Calvert, Charles, Prince George's, Saint Mary's | 60 min |
| Jun 23, 9:09 PM EDT | Severe Thunderstorm Warning | LWX | Charles | 51 min |
| Jun 23, 9:29 PM EDT | Severe Thunderstorm Warning | LWX | Calvert, Charles, Prince George's, Saint Mary's | 46 min |
| Jun 27, 5:48 PM EDT | Severe Thunderstorm Warning | PHI | Caroline, Queen Anne's, Talbot | 42 min |
| Jun 27, 5:58 PM EDT | Severe Thunderstorm Warning | PHI | Kent, Queen Anne's | 47 min |
| Jun 27, 5:59 PM EDT | Severe Thunderstorm Warning | AKQ | Dorchester | 46 min |
| Jun 27, 6:43 PM EDT | Severe Thunderstorm Warning | PHI | Caroline, Cecil, Kent, Queen Anne's | 47 min |
| Jun 30, 12:57 PM EDT | Severe Thunderstorm Warning | LWX | Harford | 33 min |
| Jun 30, 2:15 PM EDT | Severe Thunderstorm Warning | LWX | Harford | 34 min |
| Jun 30, 2:41 PM EDT | Severe Thunderstorm Warning | PHI | Cecil | 49 min |
| Jun 30, 3:14 PM EDT | Severe Thunderstorm Warning | LWX | Anne Arundel, Baltimore, Harford | 46 min |
| Jun 30, 3:25 PM EDT | Severe Thunderstorm Warning | PHI | Cecil | 37 min |
| Jun 30, 4:26 PM EDT | Severe Thunderstorm Warning | LWX | Calvert | 19 min |
| Jun 30, 4:32 PM EDT | Severe Thunderstorm Warning | PHI | Caroline, Kent, Queen Anne's, Talbot | 43 min |
| Jun 30, 9:37 PM EDT | Severe Thunderstorm Warning | LWX | Frederick, Washington | 38 min |
| Jun 30, 10:02 PM EDT | Severe Thunderstorm Warning | LWX | Carroll, Frederick, Washington | 43 min |
| Jul 1, 12:10 AM EDT | Severe Thunderstorm Warning | LWX | Anne Arundel, Calvert, Charles, Prince George's, Saint Mary's | 35 min |
| Jul 1, 12:11 AM EDT | Severe Thunderstorm Warning | LWX | Charles, Prince George's | 34 min |
| Jul 1, 12:43 AM EDT | Severe Thunderstorm Warning | LWX | Anne Arundel, Calvert, Prince George's | 32 min |
| Jul 1, 12:47 AM EDT | Severe Thunderstorm Warning | LWX | Charles, Montgomery, Prince George's | 28 min |
| Jul 1, 1:00 AM EDT | Severe Thunderstorm Warning | LWX | Anne Arundel, Baltimore, Howard, Montgomery, Prince George's, City of Baltimore | 30 min |
| Jul 1, 1:13 AM EDT | Severe Thunderstorm Warning | PHI | Caroline, Cecil, Kent, Queen Anne's | 62 min |
| Jul 1, 1:24 AM EDT | Severe Thunderstorm Warning | LWX | Anne Arundel, Baltimore, Carroll, Harford, Howard, Montgomery and 2 more | 36 min |
| Jul 1, 1:37 AM EDT | Severe Thunderstorm Warning | LWX | Baltimore, Harford | 23 min |
| Jul 1, 1:42 AM EDT | Severe Thunderstorm Warning | PHI | Cecil | 48 min |
| Jul 2, 11:51 AM EDT | Severe Thunderstorm Warning | AKQ | Worcester | 24 min |
| Jul 9, 1:44 PM EDT | Severe Thunderstorm Warning | PBZ | Garrett | 46 min |
| Jul 9, 2:30 PM EDT | Severe Thunderstorm Warning | PBZ | Garrett | 45 min |
| Jul 9, 5:23 PM EDT | Severe Thunderstorm Warning | LWX | Carroll, Frederick | 52 min |
| Jul 9, 6:24 PM EDT | Severe Thunderstorm Warning | LWX | Baltimore, Harford | 36 min |
| Jul 9, 6:50 PM EDT | Severe Thunderstorm Warning | PHI | Cecil | 40 min |
| Jul 9, 6:55 PM EDT | Severe Thunderstorm Warning | LWX | Baltimore, Harford | 20 min |
| Jul 9, 7:21 PM EDT | Severe Thunderstorm Warning | LWX | Anne Arundel | 24 min |
| Jul 9, 7:29 PM EDT | Severe Thunderstorm Warning | PHI | Cecil, Kent | 46 min |
| Jul 9, 7:38 PM EDT | Severe Thunderstorm Warning | PHI | Caroline, Kent, Queen Anne's, Talbot | 52 min |
| Jul 9, 8:15 PM EDT | Severe Thunderstorm Warning | PHI | Caroline | 45 min |
| Jul 9, 8:23 PM EDT | Severe Thunderstorm Warning | PHI | Caroline, Kent, Queen Anne's, Talbot | 22 min |
| Jul 14, 5:16 PM EDT | Severe Thunderstorm Warning | LWX | Washington | 29 min |
| Jul 15, 2:41 AM EDT | Severe Thunderstorm Warning | LWX | Harford | 19 min |
| Jul 21, 8:23 PM EDT | Severe Thunderstorm Warning | LWX | Baltimore, Harford | 37 min |
| Jul 27, 3:40 PM EDT | Severe Thunderstorm Warning | LWX | Prince George's | 36 min |
| Jul 30, 1:57 PM EDT | Severe Thunderstorm Warning | LWX | Montgomery, Prince George's | 34 min |
| Aug 4, 1:52 AM EDT | Severe Thunderstorm Warning | LWX | Allegany, Washington | 23 min |
| Aug 4, 2:12 AM EDT | Severe Thunderstorm Warning | PBZ | Garrett | 48 min |
| Aug 4, 2:13 AM EDT | Severe Thunderstorm Warning | LWX | Carroll, Frederick, Washington | 47 min |
| Aug 4, 2:35 AM EDT | Severe Thunderstorm Warning | LWX | Allegany | 25 min |
| Aug 4, 2:55 AM EDT | Severe Thunderstorm Warning | LWX | Allegany | 39 min |
| Aug 4, 2:59 AM EDT | Severe Thunderstorm Warning | LWX | Baltimore, Carroll, Frederick | 46 min |
| Aug 4, 3:45 AM EDT | Severe Thunderstorm Warning | LWX | Baltimore, Harford | 30 min |
| Aug 4, 4:14 AM EDT | Severe Thunderstorm Warning | LWX | Montgomery | 46 min |
| Aug 4, 4:20 AM EDT | Severe Thunderstorm Warning | PHI | Cecil | 33 min |
| Aug 4, 4:22 AM EDT | Severe Thunderstorm Warning | LWX | Carroll, Frederick, Howard, Montgomery, Washington | 53 min |
| Aug 4, 4:49 AM EDT | Severe Thunderstorm Warning | LWX | Anne Arundel, Baltimore, Carroll, Harford, Howard, Montgomery and 2 more | 56 min |
| Aug 4, 5:37 AM EDT | Severe Thunderstorm Warning | PHI | Cecil, Kent, Queen Anne's | 34 min |
| Aug 4, 5:27 PM EDT | Severe Thunderstorm Warning | LWX | Saint Mary's | 18 min |
| Aug 4, 5:40 PM EDT | Severe Thunderstorm Warning | LWX | Montgomery | 24 min |
| Aug 4, 6:02 PM EDT | Severe Thunderstorm Warning | LWX | Saint Mary's | 30 min |
| Aug 4, 6:26 PM EDT | Severe Thunderstorm Warning | AKQ | Somerset, Worcester | 49 min |
| Aug 4, 6:39 PM EDT | Severe Thunderstorm Warning | LWX | Charles, Prince George's | 18 min |
| Aug 4, 11:28 PM EDT | Severe Thunderstorm Warning | PHI | Caroline, Talbot | 32 min |
| Aug 11, 4:18 PM EDT | Severe Thunderstorm Warning | PHI | Caroline, Kent, Queen Anne's, Talbot | 57 min |
| Aug 24, 7:38 PM EDT | Severe Thunderstorm Warning | LWX | Baltimore, Harford, City of Baltimore | 52 min |
| Aug 24, 8:12 PM EDT | Severe Thunderstorm Warning | LWX | Anne Arundel, Baltimore, Howard, Prince George's | 48 min |
| Aug 24, 8:31 PM EDT | Severe Thunderstorm Warning | LWX | Anne Arundel, Calvert, Prince George's | 44 min |
| Aug 24, 8:52 PM EDT | Severe Thunderstorm Warning | PHI | Cecil, Kent, Queen Anne's, Talbot | 53 min |
| Sep 3, 5:35 PM EDT | Severe Thunderstorm Warning | LWX | Prince George's | 25 min |
| Sep 4, 2:36 PM EDT | Severe Thunderstorm Warning | LWX | Allegany | 21 min |
| Sep 9, 7:49 PM EDT | Severe Thunderstorm Warning | LWX | Charles, Prince George's | 21 min |
| Sep 9, 9:08 PM EDT | Severe Thunderstorm Warning | LWX | Calvert, Charles, Prince George's, Saint Mary's | 38 min |
| Sep 12, 10:45 AM EDT | Severe Thunderstorm Warning | LWX | Saint Mary's | 45 min |
| Oct 9, 4:31 PM EDT | Severe Thunderstorm Warning | LWX | Baltimore, Carroll, Harford | 44 min |
| Oct 9, 5:26 PM EDT | Severe Thunderstorm Warning | LWX | Baltimore, Carroll, Howard, City of Baltimore | 49 min |
| Oct 28, 8:44 PM EDT | Severe Thunderstorm Warning | LWX | Baltimore, Carroll, Harford | 33 min |
By county
Every county with at least one alert. A county page lists each alert that covered it.
- Prince George's County46
- Montgomery County34
- Baltimore County32
- Anne Arundel County30
- Charles County26
- Frederick County26
- Washington County25
- Harford County23
- Calvert County20
- Saint Mary's County19
- Carroll County19
- Howard County18
- Queen Anne's County18
- Cecil County17
- Kent County17
- City of Baltimore16
- Caroline County16
- Allegany County12
- Garrett County10
- Talbot County10
- Dorchester County7
- Somerset County6
- Worcester County4
- Wicomico County3
The busiest days
Days with the most alerts issued, by UTC date.
Nearby
Alerts in force nowTornadoes on recordThe radar archive20142016
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.