Alert archive / Maryland / Frederick County
Weather alerts in Frederick County, Maryland, 2021
194 weather alerts in 2021, 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 2021. Tap one for its archive.
- Alerts
- 194
- Warnings
- 93
- Watches
- 39
- Advisories
- 32
- Busiest month
- September37 alerts
- Busiest day
- May 26, 202110 alerts
Over time
By month
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, 5:37 PM EST | Winter Weather Advisory | LWX | 30 hr |
| Jan 3, 11:49 PM EST | Dense Fog Advisory | LWX | 6 hr |
| Jan 25, 1:05 AM EST | Winter Weather Advisory | LWX | 36 hr |
| Jan 26, 8:18 PM EST | Dense Fog Advisory | LWX | 13 hr |
| Jan 29, 3:10 PM EST | Winter Storm Watch | LWX | 23 hr |
| Jan 30, 9:02 AM EST | Winter Storm Warning | LWX | 69 hr |
| Jan 31, 6:50 PM EST | Winter Weather Advisory | LWX | 42 hr |
| Feb 5, 3:13 PM EST | Winter Storm Watch | LWX | 12 hr |
| Feb 6, 3:22 AM EST | Winter Storm Warning | LWX | 33 hr |
| Feb 10, 3:33 AM EST | Winter Weather Advisory | LWX | 30 hr |
| Feb 10, 12:40 PM EST | Winter Storm Warning | LWX | 21 hr |
| Feb 12, 3:10 PM EST | Winter Weather Advisory | LWX | 43 hr |
| Feb 14, 10:00 AM EST | Winter Weather Advisory | LWX | 44 hr |
| Feb 16, 4:56 AM EST | Winter Storm Watch | LWX | 29 hr |
| Feb 17, 3:24 AM EST | Winter Storm Warning | LWX | 57 hr |
| Feb 18, 1:05 PM EST | Winter Weather Advisory | LWX | 23 hr |
| Feb 21, 3:17 PM EST | Winter Weather Advisory | LWX | 24 hr |
| Feb 22, 8:22 PM EST | Wind Advisory | LWX | 22 hr |
| Feb 28, 10:55 AM EST | River Flood Watch | LWX | 21 days |
| Feb 28, 9:09 PM EST | Dense Fog Advisory | LWX | 8 hr |
| Mar 1, 3:22 AM EST | River Flood Warning | LWX | 42 hr |
| Mar 1, 5:26 AM EST | Wind Advisory | LWX | 19 hr |
| Mar 10, 3:43 PM EST | Fire Weather Watch | LWX | 12 hr |
| Mar 11, 3:28 AM EST | Red Flag Warning | LWX | 15 hr |
| Mar 13, 1:53 PM EST | Fire Weather Watch | LWX | 13 hr |
| Mar 14, 4:01 AM EDT | Red Flag Warning | LWX | 18 hr |
| Mar 24, 9:09 PM EDT | Dense Fog Advisory | LWX | 14 hr |
| Mar 25, 2:41 PM EDT | Wind Advisory | LWX | 27 hr |
| Mar 28, 4:16 AM EDT | Wind Advisory | LWX | 23 hr |
| Mar 28, 3:47 PM EDT | Severe Thunderstorm Warning | LWX | 43 min |
| Mar 28, 4:23 PM EDT | Severe Thunderstorm Warning | LWX | 52 min |
| Mar 28, 4:30 PM EDT | Severe Thunderstorm Warning | LWX | 45 min |
| Mar 28, 4:36 PM EDT | Tornado Warning | LWX | 24 min |
| Apr 11, 4:54 PM EDT | Mesoscale Discussion | SPC | 2 hr |
| Apr 11, 7:43 PM EDT | Severe Thunderstorm Warning | LWX | 25 min |
| Apr 21, 4:08 AM EDT | Freeze Warning | LWX | 29 hr |
| Apr 21, 9:06 PM EDT | Freeze Watch | LWX | 15 hr |
| Apr 22, 12:03 PM EDT | Freeze Warning | LWX | 20 hr |
| Apr 29, 3:59 AM EDT | High Wind Watch | LWX | 16 hr |
| Apr 29, 8:18 PM EDT | High Wind Warning | LWX | 25 hr |
| Apr 29, 8:18 PM EDT | Wind Advisory | LWX | 30 hr |
| Apr 30, 4:31 PM EDT | Severe Thunderstorm Warning | LWX | 29 min |
| May 3, 6:50 PM EDT | Severe Thunderstorm Warning | LWX | 40 min |
| May 3, 7:16 PM EDT | Mesoscale Discussion | SPC | 29 min |
| May 3, 7:40 PM EDT | Tornado Warning | LWX | 35 min |
| May 3, 8:11 PM EDT | Tornado Warning | LWX | 34 min |
| May 3, 8:47 PM EDT | Areal Flood Warning | LWX | 3 hr |
| May 3, 8:49 PM EDT | Severe Thunderstorm Warning | LWX | 26 min |
| May 4, 1:51 PM EDT | Severe Thunderstorm Watch | SPC | 6 hr |
| May 17, 2:51 AM EDT | Dense Fog Advisory | LWX | 7 hr |
| May 26, 1:21 PM EDT | Mesoscale Discussion | SPC | 84 min |
| May 26, 2:48 PM EDT | Severe Thunderstorm Watch | SPC | 7 hr |
| May 26, 2:51 PM EDT | Severe Thunderstorm Warning | LWX | 39 min |
| May 26, 3:21 PM EDT | Severe Thunderstorm Warning | LWX | 39 min |
| May 26, 3:31 PM EDT | Severe Thunderstorm Warning | LWX | 44 min |
| May 26, 3:56 PM EDT | Severe Thunderstorm Warning | LWX | 49 min |
| May 26, 3:59 PM EDT | Severe Thunderstorm Warning | LWX | 9 min |
| May 26, 6:34 PM EDT | Mesoscale Discussion | SPC | 116 min |
| May 26, 6:51 PM EDT | Severe Thunderstorm Warning | LWX | 39 min |
| May 26, 7:21 PM EDT | Severe Thunderstorm Warning | LWX | 39 min |
| Jun 3, 8:56 AM EDT | Flash Flood Watch | LWX | 13 hr |
| Jun 3, 1:46 PM EDT | Mesoscale Discussion | SPC | 119 min |
| Jun 3, 2:48 PM EDT | Severe Thunderstorm Watch | SPC | 6 hr |
| Jun 3, 3:14 PM EDT | Severe Thunderstorm Warning | LWX | 46 min |
| Jun 3, 3:47 PM EDT | Severe Thunderstorm Warning | LWX | 43 min |
| Jun 3, 3:50 PM EDT | Severe Thunderstorm Warning | LWX | 40 min |
| Jun 3, 4:47 PM EDT | Mesoscale Discussion | SPC | 88 min |
| Jun 3, 4:54 PM EDT | Severe Thunderstorm Warning | LWX | 36 min |
| Jun 10, 2:53 AM EDT | Flash Flood Watch | LWX | 43 hr |
| Jun 10, 2:59 PM EDT | Severe Thunderstorm Warning | LWX | 46 min |
| Jun 11, 1:41 PM EDT | Areal Flood Warning | LWX | 6 hr |
| Jun 13, 12:32 PM EDT | Mesoscale Discussion | SPC | 118 min |
| Jun 14, 7:29 PM EDT | Severe Thunderstorm Watch | SPC | 6 hr |
| Jun 14, 9:22 PM EDT | Severe Thunderstorm Warning | LWX | 38 min |
| Jun 21, 1:51 PM EDT | Mesoscale Discussion | SPC | 114 min |
| Jun 21, 2:20 PM EDT | Severe Thunderstorm Watch | SPC | 6 hr |
| Jun 21, 4:25 PM EDT | Severe Thunderstorm Warning | LWX | 50 min |
| Jun 21, 4:47 PM EDT | Severe Thunderstorm Warning | LWX | 28 min |
| Jun 21, 5:02 PM EDT | Severe Thunderstorm Warning | LWX | 43 min |
| Jun 21, 5:10 PM EDT | Severe Thunderstorm Warning | LWX | 50 min |
| Jun 30, 2:23 PM EDT | Flash Flood Watch | LWX | 42 hr |
| Jun 30, 4:41 PM EDT | Mesoscale Discussion | SPC | 2 hr |
| Jun 30, 4:51 PM EDT | Severe Thunderstorm Watch | SPC | 3 hr |
| Jun 30, 6:58 PM EDT | Mesoscale Discussion | SPC | 92 min |
| Jul 1, 11:45 AM EDT | Mesoscale Discussion | SPC | 2 hr |
| Jul 1, 12:46 PM EDT | Severe Thunderstorm Watch | SPC | 7 hr |
| Jul 6, 3:01 AM EDT | Heat Advisory | LWX | 17 hr |
| Jul 7, 4:47 PM EDT | Severe Thunderstorm Warning | LWX | 43 min |
| Jul 9, 6:55 PM EDT | Severe Thunderstorm Warning | LWX | 50 min |
| Jul 12, 1:32 PM EDT | Mesoscale Discussion | SPC | 88 min |
| Jul 12, 2:43 PM EDT | Severe Thunderstorm Warning | LWX | 47 min |
| Jul 12, 3:15 PM EDT | Severe Thunderstorm Warning | LWX | 22 min |
| Jul 12, 3:34 PM EDT | Severe Thunderstorm Watch | SPC | 5 hr |
| Jul 17, 12:00 PM EDT | Mesoscale Discussion | SPC | 3 hr |
| Jul 17, 1:13 PM EDT | Severe Thunderstorm Watch | SPC | 10 hr |
| Jul 17, 3:24 PM EDT | Severe Thunderstorm Warning | LWX | 24 min |
| Jul 17, 3:50 PM EDT | Severe Thunderstorm Warning | LWX | 40 min |
| Jul 17, 4:38 PM EDT | Mesoscale Discussion | SPC | 97 min |
| Jul 17, 5:44 PM EDT | Severe Thunderstorm Warning | LWX | 46 min |
| Jul 17, 6:35 PM EDT | Severe Thunderstorm Warning | LWX | 40 min |
| Jul 17, 6:45 PM EDT | Severe Thunderstorm Warning | LWX | 30 min |
| Jul 17, 6:54 PM EDT | Mesoscale Discussion | SPC | 2 hr |
| Jul 17, 7:11 PM EDT | Severe Thunderstorm Warning | LWX | 49 min |
| Jul 21, 11:56 AM EDT | Severe Thunderstorm Watch | SPC | 7 hr |
| Jul 21, 1:27 PM EDT | Severe Thunderstorm Warning | LWX | 21 min |
| Jul 21, 1:59 PM EDT | Severe Thunderstorm Warning | LWX | 23 min |
| Jul 29, 1:21 PM EDT | Mesoscale Discussion | SPC | 114 min |
| Jul 29, 2:23 PM EDT | Tornado Watch | SPC | 8 hr |
| Jul 29, 3:31 PM EDT | Severe Thunderstorm Warning | LWX | 44 min |
| Jul 29, 4:26 PM EDT | Mesoscale Discussion | SPC | 94 min |
| Aug 10, 1:33 PM EDT | Excessive Heat Watch | LWX | 37 hr |
| Aug 10, 1:33 PM EDT | Heat Advisory | LWX | 29 hr |
| Aug 10, 2:30 PM EDT | Mesoscale Discussion | SPC | 3 hr |
| Aug 10, 5:34 PM EDT | Severe Thunderstorm Warning | LWX | 29 min |
| Aug 10, 5:55 PM EDT | Severe Thunderstorm Warning | LWX | 27 min |
| Aug 11, 1:01 PM EDT | Mesoscale Discussion | SPC | 89 min |
| Aug 11, 2:02 PM EDT | Severe Thunderstorm Watch | SPC | 6 hr |
| Aug 11, 2:59 PM EDT | Severe Thunderstorm Warning | LWX | 46 min |
| Aug 11, 3:15 PM EDT | Severe Thunderstorm Warning | LWX | 45 min |
| Aug 11, 3:42 PM EDT | Severe Thunderstorm Warning | LWX | 48 min |
| Aug 11, 3:47 PM EDT | Mesoscale Discussion | SPC | 88 min |
| Aug 12, 2:15 AM EDT | Heat Advisory | LWX | 18 hr |
| Aug 12, 6:04 PM EDT | Heat Advisory | LWX | 25 hr |
| Aug 13, 12:33 PM EDT | Mesoscale Discussion | SPC | 87 min |
| Aug 13, 1:11 PM EDT | Severe Thunderstorm Watch | SPC | 7 hr |
| Aug 13, 3:36 PM EDT | Severe Thunderstorm Warning | LWX | 39 min |
| Aug 17, 1:54 PM EDT | Flash Flood Watch | LWX | 27 hr |
| Aug 18, 8:46 AM EDT | Mesoscale Discussion | SPC | 119 min |
| Aug 18, 10:58 AM EDT | Mesoscale Discussion | SPC | 92 min |
| Aug 18, 11:37 AM EDT | Tornado Watch | SPC | 11 hr |
| Aug 18, 3:29 PM EDT | Mesoscale Discussion | SPC | 91 min |
| Aug 18, 4:57 PM EDT | Mesoscale Discussion | SPC | 93 min |
| Aug 18, 5:13 PM EDT | Severe Thunderstorm Warning | LWX | 47 min |
| Aug 18, 5:26 PM EDT | Tornado Warning | LWX | 17 min |
| Aug 20, 4:52 AM EDT | Flash Flood Warning | LWX | 102 min |
| Aug 20, 6:34 AM EDT | Areal Flood Warning | LWX | 2 hr |
| Aug 27, 1:41 PM EDT | Mesoscale Discussion | SPC | 3 hr |
| Aug 27, 3:25 PM EDT | Severe Thunderstorm Warning | LWX | 30 min |
| Aug 27, 4:14 PM EDT | Severe Thunderstorm Warning | LWX | 46 min |
| Aug 28, 1:05 PM EDT | Mesoscale Discussion | SPC | 115 min |
| Aug 30, 4:54 AM EDT | Flash Flood Watch | LWX | 62 hr |
| Aug 31, 12:56 AM EDT | River Flood Watch | LWX | 21 days |
| Aug 31, 9:44 PM EDT | River Flood Watch | LWX | 25 hr |
| Sep 1, 12:56 AM EDT | Tornado Watch | SPC | 6 hr |
| Sep 1, 11:46 AM EDT | Tornado Watch | SPC | 9 hr |
| Sep 1, 1:30 PM EDT | Areal Flood Warning | LWX | 27 hr |
| Sep 1, 2:26 PM EDT | Flash Flood Warning | LWX | 6 hr |
| Sep 1, 3:25 PM EDT | Flash Flood Warning | LWX | 5 hr |
| Sep 1, 3:36 PM EDT | Wind Advisory | LWX | 7 hr |
| Sep 1, 7:59 PM EDT | Areal Flood Warning | LWX | 2 hr |
| Sep 1, 8:16 PM EDT | Areal Flood Warning | LWX | 6 hr |
| Sep 2, 12:48 AM EDT | River Flood Warning | LWX | 27 hr |
| Sep 2, 11:26 AM EDT | River Flood Watch | LWX | 33 hr |
| Sep 8, 6:11 PM EDT | Flash Flood Watch | LWX | 10 hr |
| Sep 8, 8:29 PM EDT | Severe Thunderstorm Watch | SPC | 4 hr |
| Sep 8, 9:11 PM EDT | Severe Thunderstorm Warning | LWX | 64 min |
| Sep 8, 9:21 PM EDT | Severe Thunderstorm Warning | LWX | 54 min |
| Sep 8, 10:18 PM EDT | Areal Flood Warning | LWX | 3 hr |
| Sep 8, 11:02 PM EDT | Flash Flood Warning | LWX | 78 min |
| Sep 8, 11:05 PM EDT | Areal Flood Warning | LWX | 5 hr |
| Sep 8, 11:57 PM EDT | Areal Flood Warning | LWX | 4 hr |
| Sep 15, 5:42 PM EDT | Severe Thunderstorm Warning | LWX | 48 min |
| Sep 15, 6:23 PM EDT | Severe Thunderstorm Warning | LWX | 52 min |
| Sep 15, 6:28 PM EDT | Severe Thunderstorm Warning | LWX | 34 min |
| Sep 15, 6:35 PM EDT | Areal Flood Warning | LWX | 113 min |
| Sep 15, 7:22 PM EDT | Flash Flood Warning | LWX | 64 min |
| Sep 15, 8:24 PM EDT | Areal Flood Warning | LWX | 2 hr |
| Sep 16, 2:44 PM EDT | Flash Flood Watch | LWX | 6 hr |
| Sep 16, 5:36 PM EDT | Areal Flood Warning | LWX | 6 hr |
| Sep 16, 7:07 PM EDT | Areal Flood Warning | LWX | 6 hr |
| Sep 21, 3:04 AM EDT | Flash Flood Watch | LWX | 57 hr |
| Sep 23, 2:02 AM EDT | Areal Flood Warning | LWX | 10 hr |
| Sep 23, 2:34 AM EDT | Flash Flood Warning | LWX | 3 hr |
| Sep 23, 3:13 AM EDT | Mesoscale Discussion | SPC | 5 hr |
| Sep 23, 3:53 AM EDT | Areal Flood Warning | LWX | 17 hr |
| Sep 23, 4:17 AM EDT | Flash Flood Warning | LWX | 3 hr |
| Sep 23, 5:35 AM EDT | Areal Flood Warning | LWX | 6 hr |
| Sep 23, 12:11 PM EDT | Areal Flood Warning | LWX | 5 hr |
| Sep 23, 1:18 PM EDT | River Flood Warning | LWX | 25 hr |
| Oct 4, 4:44 PM EDT | Mesoscale Discussion | SPC | 2 hr |
| Oct 5, 12:37 AM EDT | Dense Fog Advisory | LWX | 9 hr |
| Oct 13, 3:53 AM EDT | Dense Fog Advisory | LWX | 7 hr |
| Oct 14, 2:36 AM EDT | Dense Fog Advisory | LWX | 7 hr |
| Oct 25, 5:44 PM EDT | Severe Thunderstorm Warning | LWX | 46 min |
| Oct 25, 6:41 PM EDT | Mesoscale Discussion | SPC | 2 hr |
| Oct 26, 2:55 AM EDT | Wind Advisory | LWX | 21 hr |
| Nov 1, 3:03 AM EDT | Freeze Watch | LWX | 24 hr |
| Nov 2, 3:22 AM EDT | Freeze Warning | LWX | 30 hr |
| Nov 26, 1:48 PM EST | Wind Advisory | LWX | 3 hr |
| Dec 6, 11:09 AM EST | Wind Advisory | LWX | 14 hr |
| Dec 10, 3:30 AM EST | High Wind Watch | LWX | 12 hr |
| Dec 10, 10:48 AM EST | Wind Advisory | LWX | 38 hr |
| Dec 23, 11:43 PM EST | Winter Weather Advisory | LWX | 3 hr |
| Dec 30, 10:18 PM EST | Dense Fog Advisory | LWX | 14 hr |
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 | 52 |
| Tornado Warning | 4 |
| Severe Thunderstorm Watch | 13 |
| Tornado Watch | 4 |
| Mesoscale Discussion | 30 |
| Flooding | |
| Areal Flood Warning | 17 |
| Flash Flood Warning | 7 |
| River Flood Warning | 3 |
| Flash Flood Watch | 8 |
| River Flood Watch | 4 |
| Winter | |
| Winter Storm Warning | 4 |
| Winter Storm Watch | 3 |
| Winter Weather Advisory | 9 |
| Heat | |
| Excessive Heat Watch | 1 |
| Heat Advisory | 4 |
| Cold | |
| Freeze Warning | 3 |
| Freeze Watch | 2 |
| Wind and dust | |
| High Wind Warning | 1 |
| High Wind Watch | 2 |
| Wind Advisory | 10 |
| Fire | |
| Red Flag Warning | 2 |
| Fire Weather Watch | 2 |
| Fog and smoke | |
| Dense Fog Advisory | 9 |
The busiest days
Days with the most alerts issued, by UTC date.
Nearby
Alerts in force nowTornadoes on recordForecastThe 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. Rebuilt daily.