Alert archive / Maryland / Frederick County
Weather alerts in Frederick County, Maryland, 2025
169 weather alerts in 2025, from the National Weather Service and the Storm Prediction Center. An alert counts here when it covered this county.
Frederick County and its neighbors
Each county as a circle sized by its count in 2025. Tap one for its archive.
- Alerts
- 169
- Warnings
- 58
- Watches
- 35
- Advisories
- 38
- Busiest month
- May34 alerts
- Busiest day
- May 16, 202510 alerts
Over time
By month
Warning verification
How often warnings here had a storm report inside them, and how much warning the reports had.
Frederick County, 2025
| Warnings | With a report | False alarm ratio | Reports | Inside a warning | Mean lead time | |
|---|---|---|---|---|---|---|
| Tornado warnings | 0 | 0 | ||||
| Severe thunderstorm warnings | 42 | 30 | 29% | 42 | 86% | 15 min |
| Flash flood warnings | 3 | 2 | 33% | 3 | 100% | 45 min |
Each office's whole area, 2025
| Warnings | With a report | False alarm ratio | Reports | Inside a warning | Mean lead time | |
|---|---|---|---|---|---|---|
| NWS Baltimore/Washington: tornado warnings | 35 | 4 | 89% | 7 | 71% | 4 min |
| NWS Baltimore/Washington: severe thunderstorm warnings | 379 | 272 | 28% | 989 | 84% | 19 min |
| NWS Baltimore/Washington: flash flood warnings | 143 | 91 | 36% | 251 | 93% | 66 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 | Lasted |
|---|---|---|---|
| Jan 2, 12:51 PM EST | Winter Weather Advisory | LWX | 45 hr |
| Jan 4, 3:28 AM EST | Winter Storm Watch | LWX | 24 hr |
| Jan 4, 3:54 PM EST | Winter Storm Warning | LWX | 62 hr |
| Jan 9, 1:18 PM EST | Winter Weather Advisory | LWX | 54 hr |
| Jan 16, 4:49 PM EST | Special Weather Statement | LWX | 41 min |
| Jan 16, 6:04 PM EST | Special Weather Statement | LWX | 6 hr |
| Jan 17, 2:07 PM EST | Winter Storm Watch | LWX | 23 hr |
| Jan 18, 3:23 AM EST | Winter Storm Warning | LWX | 54 hr |
| Jan 19, 10:54 AM EST | Cold Weather Advisory | LWX | 32 hr |
| Jan 19, 1:00 PM EST | Mesoscale Discussion | SPC | 5 hr |
| Jan 20, 8:43 AM EST | Snow Squall Warning | LWX | 47 min |
| Jan 20, 9:25 AM EST | Special Weather Statement | LWX | 65 min |
| Jan 20, 10:37 AM EST | Special Weather Statement | LWX | 53 min |
| Jan 20, 1:42 PM EST | Cold Weather Advisory | LWX | 45 hr |
| Jan 21, 9:22 AM EST | Cold Weather Advisory | LWX | 26 hr |
| Jan 28, 1:55 PM EST | Wind Advisory | LWX | 28 hr |
| Feb 4, 2:49 PM EST | Winter Weather Advisory | LWX | 45 hr |
| Feb 6, 4:00 AM EST | Mesoscale Discussion | SPC | 5 hr |
| Feb 6, 6:44 PM EST | Dense Fog Advisory | LWX | 8 hr |
| Feb 7, 9:35 AM EST | Winter Weather Advisory | LWX | 38 hr |
| Feb 9, 3:09 PM EST | Winter Storm Watch | LWX | 24 hr |
| Feb 10, 2:51 PM EST | Winter Weather Advisory | LWX | 38 hr |
| Feb 11, 2:49 PM EST | Mesoscale Discussion | SPC | 4 hr |
| Feb 13, 3:13 AM EST | Wind Advisory | LWX | 18 hr |
| Feb 14, 2:22 PM EST | Winter Weather Advisory | LWX | 29 hr |
| Feb 15, 2:05 AM EST | High Wind Watch | LWX | 19 hr |
| Feb 15, 3:07 PM EST | Wind Advisory | LWX | 46 hr |
| Feb 15, 8:41 PM EST | High Wind Warning | LWX | 31 hr |
| Feb 16, 12:55 PM EST | Mesoscale Discussion | SPC | 3 hr |
| Feb 19, 12:39 PM EST | Winter Weather Advisory | LWX | 47 hr |
| Feb 28, 2:13 PM EST | Fire Weather Watch | LWX | 13 hr |
| Mar 1, 3:05 AM EST | Red Flag Warning | LWX | 16 hr |
| Mar 5, 1:12 PM EST | Wind Advisory | LWX | 36 hr |
| Mar 6, 9:31 AM EST | Wind Advisory | LWX | 14 hr |
| Mar 15, 3:16 AM EDT | Wind Advisory | LWX | 39 hr |
| Mar 16, 4:26 PM EDT | Mesoscale Discussion | SPC | 94 min |
| Mar 16, 8:41 PM EDT | Severe Thunderstorm Warning | LWX | 34 min |
| Mar 25, 2:46 PM EDT | Fire Weather Watch | LWX | 12 hr |
| Mar 26, 3:07 AM EDT | Red Flag Warning | LWX | 16 hr |
| Mar 31, 3:33 PM EDT | Mesoscale Discussion | SPC | 117 min |
| Apr 4, 3:52 AM EDT | Mesoscale Discussion | SPC | 53 min |
| Apr 5, 9:40 PM EDT | Severe Thunderstorm Warning | LWX | 35 min |
| Apr 5, 10:04 PM EDT | Severe Thunderstorm Warning | LWX | 26 min |
| Apr 8, 3:38 AM EDT | Freeze Warning | LWX | 29 hr |
| Apr 14, 3:46 AM EDT | Wind Advisory | LWX | 47 hr |
| Apr 15, 11:35 AM EDT | Wind Advisory | LWX | 8 hr |
| Apr 16, 3:33 AM EDT | Frost Advisory | LWX | 29 hr |
| Apr 19, 10:05 PM EDT | Severe Thunderstorm Warning | LWX | 25 min |
| May 3, 2:50 PM EDT | Mesoscale Discussion | SPC | 115 min |
| May 3, 3:27 PM EDT | Severe Thunderstorm Warning | LWX | 48 min |
| May 3, 4:36 PM EDT | Severe Thunderstorm Watch | SPC | 5 hr |
| May 3, 4:54 PM EDT | Severe Thunderstorm Warning | LWX | 51 min |
| May 3, 5:39 PM EDT | Severe Thunderstorm Warning | LWX | 66 min |
| May 5, 2:16 PM EDT | Mesoscale Discussion | SPC | 119 min |
| May 5, 5:29 PM EDT | Mesoscale Discussion | SPC | 2 hr |
| May 5, 5:52 PM EDT | Severe Thunderstorm Warning | LWX | 23 min |
| May 5, 6:01 PM EDT | Severe Thunderstorm Watch | SPC | 5 hr |
| May 5, 6:20 PM EDT | Severe Thunderstorm Warning | LWX | 25 min |
| May 5, 7:19 PM EDT | Severe Thunderstorm Warning | LWX | 26 min |
| May 5, 7:38 PM EDT | Flash Flood Warning | LWX | 3 hr |
| May 5, 8:11 PM EDT | Mesoscale Discussion | SPC | 2 hr |
| May 5, 10:34 PM EDT | Areal Flood Warning | LWX | 3 hr |
| May 12, 3:10 AM EDT | Flood Watch | LWX | 47 hr |
| May 13, 4:09 PM EDT | River Flood Watch | LWX | 21 days |
| May 14, 4:35 AM EDT | River Flood Warning | LWX | 56 hr |
| May 16, 1:41 PM EDT | Mesoscale Discussion | SPC | 3 hr |
| May 16, 2:32 PM EDT | Severe Thunderstorm Watch | SPC | 5 hr |
| May 16, 3:24 PM EDT | Severe Thunderstorm Warning | LWX | 36 min |
| May 16, 4:00 PM EDT | Severe Thunderstorm Warning | LWX | 32 min |
| May 16, 4:14 PM EDT | Mesoscale Discussion | SPC | 2 hr |
| May 16, 4:21 PM EDT | Severe Thunderstorm Warning | LWX | 24 min |
| May 16, 4:30 PM EDT | Severe Thunderstorm Warning | LWX | 45 min |
| May 16, 4:34 PM EDT | Severe Thunderstorm Warning | LWX | 41 min |
| May 16, 5:12 PM EDT | Severe Thunderstorm Warning | LWX | 63 min |
| May 16, 5:14 PM EDT | Severe Thunderstorm Warning | LWX | 63 min |
| May 29, 8:31 PM EDT | Flood Watch | LWX | 27 hr |
| May 30, 3:49 PM EDT | Mesoscale Discussion | SPC | 116 min |
| May 30, 5:01 PM EDT | Tornado Watch | SPC | 7 hr |
| May 30, 7:28 PM EDT | Severe Thunderstorm Warning | LWX | 47 min |
| May 30, 8:01 PM EDT | Severe Thunderstorm Warning | LWX | 29 min |
| May 30, 8:37 PM EDT | Mesoscale Discussion | SPC | 113 min |
| May 30, 8:40 PM EDT | Wind Advisory | LWX | 9 hr |
| Jun 6, 2:22 PM EDT | Severe Thunderstorm Warning | LWX | 23 min |
| Jun 8, 2:26 PM EDT | Tornado Watch | SPC | 8 hr |
| Jun 8, 4:31 PM EDT | Mesoscale Discussion | SPC | 89 min |
| Jun 14, 2:12 AM EDT | Flood Watch | LWX | 21 hr |
| Jun 14, 8:12 PM EDT | Mesoscale Discussion | SPC | 93 min |
| Jun 17, 2:50 AM EDT | Flood Watch | LWX | 20 hr |
| Jun 17, 9:42 PM EDT | Severe Thunderstorm Warning | LWX | 48 min |
| Jun 18, 11:36 AM EDT | Mesoscale Discussion | SPC | 114 min |
| Jun 18, 12:01 PM EDT | Flood Watch | LWX | 7 hr |
| Jun 18, 12:43 PM EDT | Severe Thunderstorm Watch | SPC | 6 hr |
| Jun 19, 1:22 PM EDT | Mesoscale Discussion | SPC | 113 min |
| Jun 19, 1:44 PM EDT | Severe Thunderstorm Warning | LWX | 61 min |
| Jun 19, 1:46 PM EDT | Severe Thunderstorm Watch | SPC | 9 hr |
| Jun 19, 2:07 PM EDT | Severe Thunderstorm Warning | LWX | 38 min |
| Jun 19, 2:43 PM EDT | Severe Thunderstorm Warning | LWX | 47 min |
| Jun 19, 3:14 PM EDT | Severe Thunderstorm Warning | LWX | 46 min |
| Jun 19, 3:22 PM EDT | Mesoscale Discussion | SPC | 113 min |
| Jun 19, 3:27 PM EDT | Severe Thunderstorm Warning | LWX | 33 min |
| Jun 21, 2:44 PM EDT | Heat Advisory | LWX | 29 hr |
| Jun 21, 2:44 PM EDT | Extreme Heat Watch | LWX | 24 hr |
| Jun 22, 2:21 PM EDT | Extreme Heat Watch | LWX | 19 hr |
| Jun 22, 2:21 PM EDT | Extreme Heat Warning | LWX | 31 hr |
| Jun 23, 9:37 AM EDT | Extreme Heat Warning | LWX | 35 hr |
| Jun 23, 8:53 PM EDT | Extreme Heat Watch | LWX | 17 hr |
| Jun 24, 2:06 PM EDT | Heat Advisory | LWX | 27 hr |
| Jun 25, 1:22 PM EDT | Mesoscale Discussion | SPC | 113 min |
| Jun 25, 1:51 PM EDT | Heat Advisory | LWX | 29 hr |
| Jun 25, 4:09 PM EDT | Severe Thunderstorm Warning | LWX | 51 min |
| Jun 26, 11:25 AM EDT | Flood Watch | LWX | 13 hr |
| Jun 26, 1:54 PM EDT | Mesoscale Discussion | SPC | 2 hr |
| Jun 26, 2:20 PM EDT | Severe Thunderstorm Watch | SPC | 8 hr |
| Jun 28, 5:53 PM EDT | Severe Thunderstorm Warning | LWX | 52 min |
| Jun 30, 12:07 PM EDT | Mesoscale Discussion | SPC | 113 min |
| Jun 30, 3:07 PM EDT | Flood Watch | LWX | 6 hr |
| Jul 1, 2:44 AM EDT | Flood Watch | LWX | 17 hr |
| Jul 1, 11:48 AM EDT | Mesoscale Discussion | SPC | 117 min |
| Jul 1, 12:59 PM EDT | Severe Thunderstorm Watch | SPC | 9 hr |
| Jul 8, 12:34 PM EDT | Mesoscale Discussion | SPC | 116 min |
| Jul 8, 1:42 PM EDT | Severe Thunderstorm Watch | SPC | 7 hr |
| Jul 8, 3:08 PM EDT | Severe Thunderstorm Warning | LWX | 37 min |
| Jul 8, 3:32 PM EDT | Mesoscale Discussion | SPC | 118 min |
| Jul 8, 3:56 PM EDT | Severe Thunderstorm Warning | LWX | 34 min |
| Jul 8, 8:44 PM EDT | Flood Watch | LWX | 24 hr |
| Jul 9, 12:49 PM EDT | Mesoscale Discussion | SPC | 116 min |
| Jul 9, 2:02 PM EDT | Severe Thunderstorm Watch | SPC | 8 hr |
| Jul 12, 5:47 PM EDT | Severe Thunderstorm Warning | LWX | 28 min |
| Jul 12, 6:18 PM EDT | Flash Flood Warning | LWX | 77 min |
| Jul 13, 11:37 AM EDT | Flood Watch | LWX | 10 hr |
| Jul 14, 2:36 AM EDT | Flood Watch | LWX | 20 hr |
| Jul 14, 2:20 PM EDT | Mesoscale Discussion | SPC | 2 hr |
| Jul 16, 12:06 PM EDT | Flood Watch | LWX | 12 hr |
| Jul 16, 4:39 PM EDT | Heat Advisory | LWX | 27 hr |
| Jul 16, 6:24 PM EDT | Severe Thunderstorm Warning | LWX | 36 min |
| Jul 24, 1:23 AM EDT | Heat Advisory | LWX | 43 hr |
| Jul 25, 7:09 PM EDT | Mesoscale Discussion | SPC | 96 min |
| Jul 26, 1:51 PM EDT | Mesoscale Discussion | SPC | 2 hr |
| Jul 26, 3:37 PM EDT | Severe Thunderstorm Warning | LWX | 24 min |
| Jul 26, 11:00 PM EDT | Severe Thunderstorm Warning | LWX | 45 min |
| Jul 27, 3:58 PM EDT | Severe Thunderstorm Warning | LWX | 24 min |
| Jul 29, 1:53 PM EDT | Heat Advisory | LWX | 29 hr |
| Jul 30, 2:43 PM EDT | Flood Watch | LWX | 28 hr |
| Jul 31, 1:15 PM EDT | Severe Thunderstorm Watch | SPC | 7 hr |
| Jul 31, 4:02 PM EDT | Severe Thunderstorm Warning | LWX | 28 min |
| Jul 31, 4:02 PM EDT | Mesoscale Discussion | SPC | 118 min |
| Jul 31, 4:26 PM EDT | Severe Thunderstorm Warning | LWX | 34 min |
| Jul 31, 4:27 PM EDT | Flash Flood Warning | LWX | 3 hr |
| Jul 31, 5:02 PM EDT | Severe Thunderstorm Warning | LWX | 28 min |
| Aug 17, 3:25 PM EDT | Mesoscale Discussion | SPC | 2 hr |
| Aug 17, 6:13 PM EDT | Severe Thunderstorm Warning | LWX | 47 min |
| Sep 4, 3:00 PM EDT | Severe Thunderstorm Warning | LWX | 30 min |
| Sep 25, 3:22 PM EDT | Mesoscale Discussion | SPC | 113 min |
| Oct 9, 1:06 AM EDT | Frost Advisory | LWX | 32 hr |
| Oct 16, 1:09 AM EDT | Frost Advisory | LWX | 32 hr |
| Oct 19, 7:59 PM EDT | Mesoscale Discussion | SPC | 3 hr |
| Oct 23, 2:04 AM EDT | Frost Advisory | LWX | 31 hr |
| Oct 24, 12:19 PM EDT | Freeze Warning | LWX | 21 hr |
| Oct 30, 2:08 PM EDT | Wind Advisory | LWX | 27 hr |
| Nov 5, 8:56 PM EST | Severe Thunderstorm Warning | LWX | 49 min |
| Nov 5, 9:23 PM EST | Severe Thunderstorm Warning | LWX | 52 min |
| Nov 15, 12:20 AM EST | Wind Advisory | LWX | 57 hr |
| Nov 25, 11:05 PM EST | Dense Fog Advisory | LWX | 7 hr |
| Dec 1, 12:38 AM EST | Winter Weather Advisory | LWX | 45 hr |
| Dec 12, 12:57 PM EST | Winter Weather Advisory | LWX | 54 hr |
| Dec 18, 1:47 AM EST | Wind Advisory | LWX | 47 hr |
| Dec 18, 11:53 AM EST | High Wind Warning | LWX | 34 hr |
| Dec 25, 1:57 PM EST | Winter Weather Advisory | LWX | 37 hr |
| Dec 28, 12:11 PM EST | Wind Advisory | LWX | 52 hr |
By product
Every kind of product issued here, grouped by hazard. Each opens the same place narrowed to that product.
The busiest days
Days with the most alerts issued, by UTC date.
Nearby
Alerts in force nowTornadoes on recordForecastThe radar archive20242026
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.