Alert archive / Maryland / Calvert County
Weather alerts in Calvert County, Maryland, 2026
131 weather alerts in 2026, from the National Weather Service and the Storm Prediction Center. An alert counts here when it covered this county.
Calvert County and its neighbors
Each county as a circle sized by its count in 2026. Tap one for its archive.
- Alerts
- 131
- Warnings
- 38
- Watches
- 29
- Advisories
- 25
- Busiest month
- July41 alerts
- Busiest day
- August 10, 20267 alerts
Over time
By month
Warning verification
How often warnings here had a storm report inside them, and how much warning the reports had.
0 of 1 tornado warnings covering Calvert County in 2026 had a tornado report inside them; 0 of 1 tornado reports fell inside a warning.
Calvert County, 2026
| Warnings | With a report | False alarm ratio | Reports | Inside a warning | Mean lead time | |
|---|---|---|---|---|---|---|
| Tornado warnings | 1 | 0 | 100% | 1 | 0% | |
| Severe thunderstorm warnings | 29 | 18 | 38% | 26 | 81% | 21 min |
| Flash flood warnings | 0 | 0 |
Each office's whole area, 2026
| Warnings | With a report | False alarm ratio | Reports | Inside a warning | Mean lead time | |
|---|---|---|---|---|---|---|
| NWS Baltimore/Washington: tornado warnings | 47 | 6 | 87% | 14 | 64% | 13 min |
| NWS Baltimore/Washington: severe thunderstorm warnings | 526 | 366 | 30% | 1,477 | 87% | 20 min |
| NWS Baltimore/Washington: flash flood warnings | 46 | 27 | 41% | 78 | 87% | 57 min |
An office's figures cover every county it serves, including across state lines.
The year is still running; reports filed late and damage surveys can still change these figures.
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 | Lasted |
|---|---|---|---|
| Jan 22, 2:16 AM EST | Winter Storm Watch | LWX | 32 hr |
| Jan 22, 12:49 PM EST | Cold Weather Advisory | LWX | 47 hr |
| Jan 23, 10:03 AM EST | Winter Storm Warning | LWX | 67 hr |
| Jan 25, 9:39 AM EST | Mesoscale Discussion | SPC | 3 hr |
| Jan 25, 3:02 PM EST | Mesoscale Discussion | SPC | 4 hr |
| Jan 25, 11:13 PM EST | Cold Weather Advisory | LWX | 4 days |
| Jan 27, 12:01 AM EST | Cold Weather Advisory | LWX | 35 hr |
| Jan 27, 11:39 PM EST | Cold Weather Advisory | LWX | 59 hr |
| Jan 28, 11:08 PM EST | Cold Weather Advisory | LWX | 36 hr |
| Jan 30, 12:35 AM EST | Cold Weather Advisory | LWX | 33 hr |
| Jan 31, 1:12 AM EST | Cold Weather Advisory | LWX | 34 hr |
| Feb 1, 12:05 PM EST | Cold Weather Advisory | LWX | 22 hr |
| Feb 5, 1:07 PM EST | Extreme Cold Warning | LWX | 69 hr |
| Feb 6, 1:55 AM EST | Cold Weather Advisory | LWX | 56 hr |
| Feb 6, 1:55 AM EST | High Wind Warning | LWX | 44 hr |
| Feb 7, 3:24 AM EST | Special Weather Statement | LWX | 36 min |
| Feb 7, 3:54 AM EST | Special Weather Statement | LWX | 36 min |
| Feb 7, 6:25 PM EST | Wind Advisory | LWX | 4 hr |
| Feb 8, 12:55 PM EST | Cold Weather Advisory | LWX | 21 hr |
| Feb 20, 12:04 PM EST | Winter Storm Watch | LWX | 27 hr |
| Feb 21, 2:46 PM EST | Winter Storm Warning | LWX | 57 hr |
| Feb 22, 2:22 PM EST | Mesoscale Discussion | SPC | 2 hr |
| Feb 22, 4:58 PM EST | Mesoscale Discussion | SPC | 4 hr |
| Mar 4, 8:50 PM EST | Dense Fog Advisory | LWX | 13 hr |
| Mar 15, 12:43 PM EDT | Wind Advisory | LWX | 43 hr |
| Mar 16, 10:03 AM EDT | Mesoscale Discussion | SPC | 2 hr |
| Mar 16, 10:52 AM EDT | Tornado Watch | SPC | 8 hr |
| Mar 16, 2:53 PM EDT | Severe Thunderstorm Warning | LWX | 31 min |
| Mar 16, 3:14 PM EDT | Mesoscale Discussion | SPC | 91 min |
| Mar 16, 8:15 PM EDT | Severe Thunderstorm Watch | SPC | 4 hr |
| Mar 16, 9:03 PM EDT | Severe Thunderstorm Warning | LWX | 42 min |
| Mar 16, 9:04 PM EDT | Mesoscale Discussion | SPC | 116 min |
| Mar 16, 9:12 PM EDT | Severe Thunderstorm Warning | LWX | 33 min |
| Mar 16, 9:49 PM EDT | Tornado Warning | LWX | 11 min |
| Apr 1, 5:15 PM EDT | Severe Thunderstorm Warning | LWX | 29 min |
| Apr 1, 10:58 PM EDT | Severe Thunderstorm Warning | LWX | 32 min |
| Apr 8, 12:57 PM EDT | Frost Advisory | LWX | 20 hr |
| Apr 18, 11:59 PM EDT | Freeze Watch | LWX | 24 hr |
| Apr 19, 11:35 PM EDT | Freeze Warning | LWX | 33 hr |
| Apr 29, 8:55 PM EDT | Coastal Flood Advisory | LWX | 13 hr |
| May 27, 1:11 PM EDT | Severe Thunderstorm Watch | SPC | 9 hr |
| Jun 6, 1:42 PM EDT | Severe Thunderstorm Watch | SPC | 6 hr |
| Jun 6, 6:36 PM EDT | Mesoscale Discussion | SPC | 114 min |
| Jun 11, 2:24 AM EDT | Heat Advisory | LWX | 18 hr |
| Jun 11, 2:58 PM EDT | Heat Advisory | LWX | 26 hr |
| Jun 11, 3:02 PM EDT | Mesoscale Discussion | SPC | 118 min |
| Jun 11, 7:14 PM EDT | Severe Thunderstorm Watch | SPC | 5 hr |
| Jun 11, 8:29 PM EDT | Severe Thunderstorm Warning | LWX | 61 min |
| Jun 12, 2:36 PM EDT | Mesoscale Discussion | SPC | 24 min |
| Jun 12, 2:45 PM EDT | Severe Thunderstorm Watch | SPC | 8 hr |
| Jun 12, 4:48 PM EDT | Mesoscale Discussion | SPC | 117 min |
| Jun 12, 5:13 PM EDT | Severe Thunderstorm Warning | LWX | 32 min |
| Jun 12, 8:41 PM EDT | Severe Thunderstorm Warning | LWX | 19 min |
| Jun 14, 4:18 PM EDT | Severe Thunderstorm Watch | SPC | 6 hr |
| Jun 14, 6:22 PM EDT | Mesoscale Discussion | SPC | 113 min |
| Jun 14, 7:23 PM EDT | Severe Thunderstorm Warning | LWX | 22 min |
| Jun 14, 7:33 PM EDT | Severe Thunderstorm Warning | LWX | 27 min |
| Jun 22, 1:25 PM EDT | Mesoscale Discussion | SPC | 2 hr |
| Jun 22, 2:08 PM EDT | Severe Thunderstorm Watch | SPC | 8 hr |
| Jun 22, 6:54 PM EDT | Severe Thunderstorm Warning | LWX | 51 min |
| Jun 22, 7:01 PM EDT | Severe Thunderstorm Warning | LWX | 29 min |
| Jun 23, 11:45 AM EDT | Severe Thunderstorm Watch | SPC | 8 hr |
| Jun 26, 3:37 PM EDT | Mesoscale Discussion | SPC | 113 min |
| Jun 30, 3:03 AM EDT | Heat Advisory | LWX | 41 hr |
| Jun 30, 3:03 AM EDT | Extreme Heat Watch | LWX | 34 hr |
| Jul 1, 1:32 PM EDT | Extreme Heat Warning | LWX | 30 hr |
| Jul 1, 1:32 PM EDT | Extreme Heat Warning | LWX | 55 hr |
| Jul 2, 8:36 AM EDT | Extreme Heat Watch | LWX | 5 hr |
| Jul 2, 1:32 PM EDT | Extreme Heat Warning | LWX | 54 hr |
| Jul 4, 12:49 PM EDT | Mesoscale Discussion | SPC | 2 hr |
| Jul 4, 2:16 PM EDT | Severe Thunderstorm Watch | SPC | 9 hr |
| Jul 4, 6:47 PM EDT | Mesoscale Discussion | SPC | 118 min |
| Jul 4, 6:57 PM EDT | Severe Thunderstorm Warning | LWX | 63 min |
| Jul 5, 1:57 AM EDT | Heat Advisory | LWX | 18 hr |
| Jul 5, 6:00 PM EDT | Mesoscale Discussion | SPC | 2 hr |
| Jul 5, 6:44 PM EDT | Severe Thunderstorm Watch | SPC | 6 hr |
| Jul 6, 4:09 AM EDT | Flood Watch | LWX | 22 hr |
| Jul 9, 2:05 PM EDT | Mesoscale Discussion | SPC | 115 min |
| Jul 9, 2:30 PM EDT | Severe Thunderstorm Watch | SPC | 7 hr |
| Jul 9, 6:10 PM EDT | Severe Thunderstorm Warning | LWX | 65 min |
| Jul 9, 6:24 PM EDT | Severe Thunderstorm Warning | LWX | 24 min |
| Jul 9, 7:06 PM EDT | Mesoscale Discussion | SPC | 84 min |
| Jul 12, 2:45 PM EDT | Coastal Flood Advisory | LWX | 19 hr |
| Jul 14, 12:04 PM EDT | Heat Advisory | LWX | 32 hr |
| Jul 16, 9:55 AM EDT | Heat Advisory | LWX | 10 hr |
| Jul 18, 2:16 AM EDT | Heat Advisory | LWX | 16 hr |
| Jul 18, 12:50 PM EDT | Mesoscale Discussion | SPC | 85 min |
| Jul 18, 1:55 PM EDT | Tornado Watch | SPC | 6 hr |
| Jul 18, 4:39 PM EDT | Mesoscale Discussion | SPC | 96 min |
| Jul 21, 1:53 PM EDT | Mesoscale Discussion | SPC | 97 min |
| Jul 21, 2:46 PM EDT | Severe Thunderstorm Watch | SPC | 11 hr |
| Jul 21, 4:17 PM EDT | Severe Thunderstorm Warning | LWX | 43 min |
| Jul 21, 4:43 PM EDT | Mesoscale Discussion | SPC | 92 min |
| Jul 21, 4:44 PM EDT | Severe Thunderstorm Warning | LWX | 31 min |
| Jul 21, 10:00 PM EDT | Severe Thunderstorm Warning | LWX | 45 min |
| Jul 21, 10:36 PM EDT | Severe Thunderstorm Warning | LWX | 24 min |
| Jul 21, 10:39 PM EDT | Mesoscale Discussion | SPC | 66 min |
| Jul 22, 1:40 PM EDT | Mesoscale Discussion | SPC | 2 hr |
| Jul 26, 9:04 PM EDT | Mesoscale Discussion | SPC | 116 min |
| Jul 27, 2:11 PM EDT | Mesoscale Discussion | SPC | 2 hr |
| Jul 28, 2:04 PM EDT | Mesoscale Discussion | SPC | 116 min |
| Jul 28, 2:48 PM EDT | Severe Thunderstorm Watch | SPC | 9 hr |
| Jul 28, 4:20 PM EDT | Tornado Watch | SPC | 5 hr |
| Jul 28, 4:46 PM EDT | Severe Thunderstorm Warning | LWX | 29 min |
| Jul 28, 4:53 PM EDT | Mesoscale Discussion | SPC | 2 hr |
| Jul 28, 6:48 PM EDT | Severe Thunderstorm Warning | LWX | 27 min |
| Aug 8, 3:08 PM EDT | Mesoscale Discussion | SPC | 97 min |
| Aug 10, 12:59 PM EDT | Mesoscale Discussion | SPC | 2 hr |
| Aug 10, 1:13 PM EDT | Severe Thunderstorm Watch | SPC | 7 hr |
| Aug 10, 4:41 PM EDT | Severe Thunderstorm Warning | LWX | 31 min |
| Aug 10, 5:29 PM EDT | Severe Thunderstorm Warning | LWX | 46 min |
| Aug 10, 5:36 PM EDT | Severe Thunderstorm Warning | LWX | 24 min |
| Aug 10, 5:56 PM EDT | Severe Thunderstorm Warning | LWX | 64 min |
| Aug 10, 6:28 PM EDT | Mesoscale Discussion | SPC | 92 min |
| Aug 16, 7:00 PM EDT | Mesoscale Discussion | SPC | 60 min |
| Aug 16, 9:29 PM EDT | Severe Thunderstorm Warning | LWX | 46 min |
| Aug 17, 9:03 PM EDT | Severe Thunderstorm Warning | LWX | 42 min |
| Aug 20, 1:53 PM EDT | Mesoscale Discussion | SPC | 2 hr |
| Aug 20, 2:31 PM EDT | Severe Thunderstorm Watch | SPC | 7 hr |
| Aug 20, 2:58 PM EDT | Tornado Watch | SPC | 7 hr |
| Aug 22, 11:35 PM EDT | Severe Thunderstorm Warning | LWX | 25 min |
| Aug 27, 3:17 PM EDT | Severe Thunderstorm Watch | SPC | 7 hr |
| Sep 2, 11:46 AM EDT | Severe Thunderstorm Watch | SPC | 5 hr |
| Sep 2, 1:21 PM EDT | Mesoscale Discussion | SPC | 84 min |
| Sep 2, 4:08 PM EDT | Heat Advisory | LWX | 27 hr |
| Sep 3, 6:19 PM EDT | Mesoscale Discussion | SPC | 116 min |
| Sep 3, 8:38 PM EDT | Severe Thunderstorm Watch | SPC | 5 hr |
| Sep 3, 11:13 PM EDT | Mesoscale Discussion | SPC | 92 min |
| Sep 3, 11:56 PM EDT | Severe Thunderstorm Warning | LWX | 49 min |
| Sep 4, 2:04 PM EDT | Severe Thunderstorm Watch | SPC | 7 hr |
| Sep 22, 7:50 AM EDT | Coastal Flood Advisory | LWX | 6 days |
By product
Every kind of product issued here, grouped by hazard. Each opens the same place narrowed to that product.
| Product | Alerts |
|---|---|
| Severe storms | |
| Severe Thunderstorm Warning | 29 |
| Tornado Warning | 1 |
| Severe Thunderstorm Watch | 19 |
| Tornado Watch | 4 |
| Mesoscale Discussion | 37 |
| Special Weather Statement | 2 |
| Flooding | |
| Flood Watch | 1 |
| Winter | |
| Winter Storm Warning | 2 |
| Winter Storm Watch | 2 |
| Heat | |
| Extreme Heat Warning | 3 |
| Extreme Heat Watch | 2 |
| Heat Advisory | 8 |
| Cold | |
| Extreme Cold Warning | 1 |
| Freeze Warning | 1 |
| Freeze Watch | 1 |
| Cold Weather Advisory | 10 |
| Frost Advisory | 1 |
| Wind and dust | |
| High Wind Warning | 1 |
| Wind Advisory | 2 |
| Fog and smoke | |
| Dense Fog Advisory | 1 |
| Coast and beach | |
| Coastal Flood Advisory | 3 |
The busiest days
Days with the most alerts issued, by UTC date.
Nearby
Alerts in force nowTornadoes on recordForecastThe radar archive2025
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.