Calvert County weather alerts
There are no active weather alerts for Calvert County, MD right now.
Since 2016 the National Weather Service has issued about 1,024 alerts that included Calvert County, roughly 102 a year. The most common is the severe thunderstorm warning (248 from 2016 to 2025). The last tornado warning was issued on March 17, 2026. 19 tornadoes have touched down in the county since 1950.
Updated from the National Weather Service · lists refresh hourly; the live map loads current alerts directly from the NWS
No warnings, watches or advisories include Calvert County at the moment. This page updates automatically when the National Weather Service issues one. Check neighboring St. Mary's County, Charles County, Anne Arundel County, Prince George's County.
Calvert County alert history
Alert events that included Calvert County or its forecast zones, from the NWS warning archive.
| Alert type | 2016–2025 | 2026 | Last issued |
|---|---|---|---|
| Severe Thunderstorm Warning | 248 | 29 | September 4, 2026 |
| Coastal Flood Advisory | 168 | 6 | October 24, 2026 |
| Severe Thunderstorm Watch | 102 | 20 | October 16, 2026 |
| Wind Advisory | 75 | 2 | March 16, 2026 |
| Flood Watch | 63 | 1 | July 6, 2026 |
| Heat Advisory | 60 | 8 | September 3, 2026 |
| Flood Warning | 41 | 0 | December 18, 2023 |
| Dense Fog Advisory | 37 | 1 | March 5, 2026 |
| Winter Weather Advisory | 34 | 0 | December 13, 2025 |
| Frost Advisory | 21 | 1 | April 9, 2026 |
| Tornado Watch | 21 | 4 | August 20, 2026 |
| Extreme Heat Warning | 16 | 3 | July 4, 2026 |
| Freeze Warning | 14 | 1 | April 21, 2026 |
| Extreme Heat Watch | 13 | 2 | July 4, 2026 |
| Flash Flood Warning | 13 | 0 | September 9, 2023 |
| Tornado Warning | 13 | 1 | March 17, 2026 |
| Freeze Watch | 11 | 1 | April 21, 2026 |
| Winter Storm Warning | 11 | 2 | February 22, 2026 |
| High Wind Warning | 10 | 1 | February 7, 2026 |
| Fire Weather Watch | 9 | 0 | November 16, 2025 |
| Red Flag Warning | 9 | 0 | November 16, 2025 |
| Cold Weather Advisory | 9 | 10 | February 9, 2026 |
| Winter Storm Watch | 8 | 2 | February 22, 2026 |
| Coastal Flood Warning | 6 | 0 | October 29, 2025 |
| High Wind Watch | 4 | 0 | February 16, 2025 |
| Tropical Storm Warning | 3 | 0 | September 21, 2023 |
| Tropical Storm Watch | 2 | 0 | July 7, 2021 |
| Blizzard Warning | 1 | 0 | January 22, 2016 |
| Ice Storm Warning | 1 | 0 | February 13, 2021 |
| Snow Squall Warning | 1 | 0 | January 3, 2025 |
| Extreme Cold Warning | 0 | 1 | February 7, 2026 |
Tornado history in Calvert County
19 tornadoes have been recorded in Calvert County since 1950, killing 3 people and injuring 123. That ranks 10 of 24 counties in Maryland. The most recent was on August 4, 2020 (rated EF1).
Strongest tornadoes in Calvert County
| Date | Rating | County | Path length | Width | Deaths | Injuries |
|---|---|---|---|---|---|---|
| April 28, 2002 | F4 | Charles County | 38 mi | 650 yd | 3 | 122 |
| June 27, 1978 | F2 | Calvert County | 6.9 mi | 50 yd | 0 | 0 |
| October 13, 1983 | F2 | St. Mary's County | 4 mi | 37 yd | 0 | 0 |
| May 13, 2000 | F1 | Prince George's County | 12 mi | 150 yd | 0 | 0 |
| April 28, 2002 | F1 | Calvert County | 5 mi | 50 yd | 0 | 0 |
Most recent tornadoes
| Date | Rating | County | Path length | Width | Deaths | Injuries |
|---|---|---|---|---|---|---|
| August 4, 2020 | EF1 | Calvert County | 3 mi | 100 yd | 0 | 0 |
| August 4, 2020 | EF0 | Calvert County | 0.8 mi | 175 yd | 0 | 0 |
| February 21, 2014 | EF0 | St. Mary's County | 23.6 mi | 75 yd | 0 | 0 |
| August 7, 2012 | EF0 | Calvert County | 0.7 mi | 25 yd | 0 | 0 |
| April 28, 2011 | EF0 | Calvert County | 1.7 mi | 50 yd | 0 | 0 |
About Calvert County
- Population: 94,913 (2024 estimate)
- State: Maryland
- NOAA Weather Radio SAME code: 024009 (how to use it)