Alert archive / Maryland / Severe Thunderstorm Warnings / 2021
Severe Thunderstorm Warnings in Maryland, April 2021
11 severe thunderstorm warnings in April 2021. 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 April 2021. Tap one for its archive.
- Severe Thunderstorm Warnings
- 11
- Busiest day
- April 21, 20215 severe thunderstorm warnings
Over time
By day
Days in UTC, the clock the archive keeps.
The alerts
Every alert, in the order issued. Times are local, Eastern Time. Each opens its own page with the text, the map, the radar and the sounding.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Apr 11, 7:43 PM EDT | Severe Thunderstorm Warning | LWX | Baltimore, Carroll, Frederick, Howard | 25 min |
| Apr 11, 9:01 PM EDT | Severe Thunderstorm Warning | LWX | Cecil, Harford | 44 min |
| Apr 11, 9:16 PM EDT | Severe Thunderstorm Warning | LWX | Cecil, Harford | 44 min |
| Apr 21, 12:43 PM EDT | Severe Thunderstorm Warning | LWX | Charles, Saint Mary's | 33 min |
| Apr 21, 12:50 PM EDT | Severe Thunderstorm Warning | PHI | Caroline, Kent, Queen Anne's, Talbot | 40 min |
| Apr 21, 1:09 PM EDT | Severe Thunderstorm Warning | LWX | Calvert, Saint Mary's | 30 min |
| Apr 21, 1:23 PM EDT | Severe Thunderstorm Warning | PHI | Caroline, Queen Anne's, Talbot | 37 min |
| Apr 21, 2:19 PM EDT | Severe Thunderstorm Warning | AKQ | Somerset, Worcester | 41 min |
| Apr 30, 4:31 PM EDT | Severe Thunderstorm Warning | LWX | Baltimore, Carroll, Frederick, Howard, Montgomery, Washington | 29 min |
| Apr 30, 4:39 PM EDT | Severe Thunderstorm Warning | LWX | Anne Arundel, Charles, Howard, Montgomery, Prince George's | 36 min |
| Apr 30, 5:11 PM EDT | Severe Thunderstorm Warning | LWX | Anne Arundel, Calvert, Charles, Prince George's, Saint Mary's | 34 min |
By county
Every county with at least one alert. A county page lists each alert that covered it.
- Howard County3
- Charles County3
- Saint Mary's County3
- Baltimore County2
- Carroll County2
- Frederick County2
- Cecil County2
- Harford County2
- Caroline County2
- Queen Anne's County2
- Talbot County2
- Calvert County2
- Montgomery County2
- Anne Arundel County2
- Prince George's County2
- Kent County1
- Somerset County1
- Worcester County1
- Washington County1
Nearby
Alerts in force nowTornadoes on recordThe radar archive20202022
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.