Alert archive / Maryland / Frederick County
Weather alerts in Frederick County, Maryland, 2020
164 weather alerts in 2020, 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 2020. Tap one for its archive.
- Alerts
- 164
- Warnings
- 65
- Watches
- 30
- Advisories
- 37
- Busiest month
- August27 alerts
- Busiest day
- June 22, 20208 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 4, 4:14 AM EST | Dense Fog Advisory | LWX | 7 hr |
| Jan 6, 1:49 PM EST | Winter Weather Advisory | LWX | 29 hr |
| Jan 7, 12:29 PM EST | Mesoscale Discussion | SPC | 2 hr |
| Jan 8, 3:40 AM EST | Wind Advisory | LWX | 13 hr |
| Jan 8, 7:33 AM EST | Snow Squall Warning | LWX | 27 min |
| Jan 8, 7:56 AM EST | Snow Squall Warning | LWX | 34 min |
| Jan 11, 1:13 PM EST | Wind Advisory | LWX | 20 hr |
| Jan 14, 10:41 PM EST | Dense Fog Advisory | LWX | 10 hr |
| Jan 15, 2:50 PM EST | Wind Advisory | LWX | 22 hr |
| Jan 17, 1:33 PM EST | Winter Weather Advisory | LWX | 29 hr |
| Feb 1, 1:28 AM EST | Dense Fog Advisory | LWX | 9 hr |
| Feb 6, 9:30 PM EST | Wind Advisory | LWX | 20 hr |
| Feb 7, 4:08 AM EST | Dense Fog Advisory | LWX | 3 hr |
| Feb 7, 7:26 AM EST | Severe Thunderstorm Warning | LWX | 34 min |
| Feb 7, 7:37 AM EST | Tornado Warning | LWX | 23 min |
| Feb 7, 7:46 AM EST | Tornado Warning | LWX | 29 min |
| Feb 26, 12:54 AM EST | Dense Fog Advisory | LWX | 8 hr |
| Feb 26, 2:49 PM EST | Mesoscale Discussion | SPC | 116 min |
| Mar 3, 4:27 PM EST | Mesoscale Discussion | SPC | 2 hr |
| Mar 3, 10:26 PM EST | Severe Thunderstorm Warning | LWX | 34 min |
| Mar 3, 10:52 PM EST | Mesoscale Discussion | SPC | 113 min |
| Mar 3, 10:54 PM EST | Severe Thunderstorm Warning | LWX | 36 min |
| Mar 29, 11:16 PM EDT | Dense Fog Advisory | LWX | 5 hr |
| Apr 8, 3:43 AM EDT | Severe Thunderstorm Warning | LWX | 47 min |
| Apr 8, 3:53 AM EDT | Severe Thunderstorm Warning | LWX | 37 min |
| Apr 8, 3:53 AM EDT | Mesoscale Discussion | SPC | 97 min |
| Apr 8, 8:13 PM EDT | Wind Advisory | LWX | 23 hr |
| Apr 9, 11:44 AM EDT | Severe Thunderstorm Warning | LWX | 46 min |
| Apr 9, 11:51 AM EDT | Severe Thunderstorm Warning | LWX | 39 min |
| Apr 9, 7:38 PM EDT | Wind Advisory | LWX | 22 hr |
| Apr 9, 7:47 PM EDT | Freeze Watch | LWX | 19 hr |
| Apr 10, 2:28 PM EDT | Freeze Warning | LWX | 19 hr |
| Apr 12, 12:35 PM EDT | Wind Advisory | LWX | 29 hr |
| Apr 13, 10:34 AM EDT | Mesoscale Discussion | SPC | 86 min |
| Apr 13, 11:33 AM EDT | Tornado Watch | SPC | 5 hr |
| Apr 13, 12:42 PM EDT | Severe Thunderstorm Warning | LWX | 48 min |
| Apr 13, 1:20 PM EDT | Severe Thunderstorm Warning | LWX | 40 min |
| Apr 13, 1:20 PM EDT | Mesoscale Discussion | SPC | 85 min |
| Apr 15, 1:09 PM EDT | Freeze Watch | LWX | 24 hr |
| Apr 16, 1:19 PM EDT | Freeze Warning | LWX | 20 hr |
| Apr 17, 7:20 PM EDT | Freeze Watch | LWX | 18 hr |
| Apr 18, 1:19 PM EDT | Frost Advisory | LWX | 20 hr |
| Apr 21, 4:04 AM EDT | Freeze Warning | LWX | 27 hr |
| Apr 25, 3:38 AM EDT | Dense Fog Advisory | LWX | 3 hr |
| Apr 29, 4:24 AM EDT | Flood Watch | LWX | 39 hr |
| Apr 30, 11:11 AM EDT | Areal Flood Warning | LWX | 10 hr |
| Apr 30, 7:53 PM EDT | Areal Flood Warning | LWX | 7 hr |
| May 1, 4:11 AM EDT | River Flood Warning | LWX | 14 hr |
| May 7, 2:16 PM EDT | Freeze Watch | LWX | 24 hr |
| May 7, 2:16 PM EDT | Freeze Warning | LWX | 43 hr |
| May 8, 3:30 AM EDT | Freeze Watch | LWX | 24 hr |
| May 9, 3:36 AM EDT | Freeze Warning | LWX | 28 hr |
| May 11, 3:43 AM EDT | Frost Advisory | LWX | 26 hr |
| May 12, 2:41 PM EDT | Frost Advisory | LWX | 18 hr |
| May 23, 4:09 AM EDT | Dense Fog Advisory | LWX | 4 hr |
| May 29, 12:27 PM EDT | Mesoscale Discussion | SPC | 63 min |
| May 29, 2:25 PM EDT | Severe Thunderstorm Warning | LWX | 29 min |
| May 29, 2:25 PM EDT | Severe Thunderstorm Watch | SPC | 7 hr |
| May 29, 2:40 PM EDT | Severe Thunderstorm Warning | LWX | 25 min |
| May 29, 2:53 PM EDT | Severe Thunderstorm Warning | LWX | 25 min |
| Jun 3, 3:10 PM EDT | Mesoscale Discussion | SPC | 2 hr |
| Jun 4, 2:02 PM EDT | Mesoscale Discussion | SPC | 118 min |
| Jun 4, 2:29 PM EDT | Severe Thunderstorm Watch | SPC | 8 hr |
| Jun 4, 4:41 PM EDT | Mesoscale Discussion | SPC | 94 min |
| Jun 4, 10:10 PM EDT | Severe Thunderstorm Warning | LWX | 25 min |
| Jun 5, 3:40 AM EDT | Flash Flood Watch | LWX | 17 hr |
| Jun 5, 4:28 PM EDT | Areal Flood Warning | LWX | 4 hr |
| Jun 10, 7:23 PM EDT | Severe Thunderstorm Warning | LWX | 37 min |
| Jun 10, 10:06 PM EDT | Severe Thunderstorm Warning | LWX | 24 min |
| Jun 10, 10:24 PM EDT | Severe Thunderstorm Warning | LWX | 26 min |
| Jun 22, 1:58 PM EDT | Mesoscale Discussion | SPC | 3 hr |
| Jun 22, 2:39 PM EDT | Severe Thunderstorm Warning | LWX | 35 min |
| Jun 22, 3:41 PM EDT | Severe Thunderstorm Warning | LWX | 49 min |
| Jun 22, 3:45 PM EDT | Severe Thunderstorm Warning | LWX | 24 min |
| Jun 22, 4:12 PM EDT | Severe Thunderstorm Warning | LWX | 48 min |
| Jun 22, 4:14 PM EDT | Severe Thunderstorm Warning | LWX | 46 min |
| Jun 22, 4:54 PM EDT | Severe Thunderstorm Warning | LWX | 51 min |
| Jun 22, 5:58 PM EDT | Severe Thunderstorm Warning | LWX | 47 min |
| Jun 23, 3:08 AM EDT | Dense Fog Advisory | LWX | 6 hr |
| Jun 23, 1:58 PM EDT | Flash Flood Watch | LWX | 10 hr |
| Jun 23, 9:50 PM EDT | Flash Flood Warning | LWX | 2 hr |
| Jun 25, 1:48 PM EDT | Mesoscale Discussion | SPC | 117 min |
| Jun 25, 5:26 PM EDT | Severe Thunderstorm Warning | LWX | 29 min |
| Jun 25, 6:08 PM EDT | Severe Thunderstorm Warning | LWX | 52 min |
| Jun 25, 6:09 PM EDT | Mesoscale Discussion | SPC | 96 min |
| Jul 5, 1:50 PM EDT | Mesoscale Discussion | SPC | 115 min |
| Jul 6, 1:38 PM EDT | Severe Thunderstorm Watch | SPC | 9 hr |
| Jul 6, 4:33 PM EDT | Mesoscale Discussion | SPC | 117 min |
| Jul 6, 6:50 PM EDT | Severe Thunderstorm Warning | LWX | 10 min |
| Jul 18, 2:59 PM EDT | Heat Advisory | LWX | 29 hr |
| Jul 19, 2:47 PM EDT | Heat Advisory | LWX | 29 hr |
| Jul 21, 2:01 PM EDT | Mesoscale Discussion | SPC | 59 min |
| Jul 22, 12:07 AM EDT | Heat Advisory | LWX | 18 hr |
| Jul 22, 10:48 AM EDT | Mesoscale Discussion | SPC | 117 min |
| Jul 22, 12:01 PM EDT | Severe Thunderstorm Watch | SPC | 7 hr |
| Jul 22, 1:36 PM EDT | Flash Flood Watch | LWX | 4 hr |
| Jul 30, 10:01 PM EDT | Flash Flood Watch | LWX | 20 hr |
| Aug 1, 4:00 PM EDT | Mesoscale Discussion | SPC | 2 hr |
| Aug 1, 7:05 PM EDT | Mesoscale Discussion | SPC | 115 min |
| Aug 2, 3:28 PM EDT | Flash Flood Watch | LWX | 45 hr |
| Aug 5, 10:51 PM EDT | Flash Flood Watch | LWX | 25 hr |
| Aug 6, 8:56 PM EDT | Severe Thunderstorm Warning | LWX | 49 min |
| Aug 6, 9:07 PM EDT | Severe Thunderstorm Warning | LWX | 38 min |
| Aug 7, 3:46 AM EDT | Flash Flood Watch | LWX | 21 hr |
| Aug 7, 1:30 PM EDT | Mesoscale Discussion | SPC | 3 hr |
| Aug 7, 2:08 PM EDT | Severe Thunderstorm Warning | LWX | 52 min |
| Aug 7, 2:48 PM EDT | Severe Thunderstorm Warning | LWX | 36 min |
| Aug 11, 3:19 PM EDT | Flash Flood Watch | LWX | 52 hr |
| Aug 12, 1:15 PM EDT | Mesoscale Discussion | SPC | 2 hr |
| Aug 12, 6:50 PM EDT | Areal Flood Warning | LWX | 108 min |
| Aug 23, 3:57 PM EDT | Mesoscale Discussion | SPC | 2 hr |
| Aug 23, 5:01 PM EDT | Severe Thunderstorm Warning | LWX | 44 min |
| Aug 23, 5:29 PM EDT | Severe Thunderstorm Warning | LWX | 46 min |
| Aug 24, 12:44 PM EDT | Mesoscale Discussion | SPC | 2 hr |
| Aug 24, 2:38 PM EDT | Severe Thunderstorm Warning | LWX | 20 min |
| Aug 25, 3:10 PM EDT | Mesoscale Discussion | SPC | 95 min |
| Aug 25, 3:34 PM EDT | Severe Thunderstorm Watch | SPC | 7 hr |
| Aug 25, 7:07 PM EDT | Mesoscale Discussion | SPC | 113 min |
| Aug 27, 6:35 PM EDT | Mesoscale Discussion | SPC | 115 min |
| Aug 28, 9:55 AM EDT | Mesoscale Discussion | SPC | 3 hr |
| Aug 28, 1:37 PM EDT | Severe Thunderstorm Watch | SPC | 8 hr |
| Aug 28, 3:07 PM EDT | Severe Thunderstorm Warning | LWX | 38 min |
| Aug 28, 3:19 PM EDT | Severe Thunderstorm Warning | LWX | 41 min |
| Aug 28, 4:33 PM EDT | Severe Thunderstorm Warning | LWX | 42 min |
| Sep 2, 3:37 PM EDT | Mesoscale Discussion | SPC | 53 min |
| Sep 2, 6:17 PM EDT | Severe Thunderstorm Warning | LWX | 43 min |
| Sep 2, 6:32 PM EDT | Severe Thunderstorm Warning | LWX | 43 min |
| Sep 2, 6:43 PM EDT | Severe Thunderstorm Watch | SPC | 5 hr |
| Sep 2, 6:54 PM EDT | Severe Thunderstorm Warning | LWX | 51 min |
| Sep 2, 7:06 PM EDT | Severe Thunderstorm Warning | LWX | 39 min |
| Sep 3, 3:06 PM EDT | Mesoscale Discussion | SPC | 114 min |
| Sep 3, 3:30 PM EDT | Severe Thunderstorm Warning | LWX | 45 min |
| Sep 3, 3:41 PM EDT | Severe Thunderstorm Warning | LWX | 49 min |
| Sep 3, 3:42 PM EDT | Tornado Watch | SPC | 6 hr |
| Sep 3, 3:43 PM EDT | Tornado Warning | LWX | 19 min |
| Sep 20, 1:43 PM EDT | Frost Advisory | LWX | 19 hr |
| Sep 21, 1:31 PM EDT | Frost Advisory | LWX | 19 hr |
| Oct 17, 2:25 PM EDT | Frost Advisory | LWX | 20 hr |
| Oct 21, 1:51 AM EDT | Dense Fog Advisory | LWX | 9 hr |
| Oct 22, 1:01 AM EDT | Dense Fog Advisory | LWX | 9 hr |
| Oct 22, 10:21 AM EDT | Dense Fog Advisory | LWX | 99 min |
| Oct 23, 3:26 AM EDT | Dense Fog Advisory | LWX | 8 hr |
| Oct 28, 3:05 PM EDT | Flood Watch | LWX | 25 hr |
| Oct 29, 3:24 AM EDT | Freeze Watch | LWX | 13 hr |
| Oct 29, 4:14 PM EDT | Freeze Warning | LWX | 41 hr |
| Oct 31, 6:59 PM EDT | Wind Advisory | LWX | 44 hr |
| Nov 1, 8:45 PM EST | Wind Advisory | LWX | 3 hr |
| Nov 9, 4:44 AM EST | Dense Fog Advisory | LWX | 5 hr |
| Nov 14, 2:06 PM EST | Wind Advisory | LWX | 41 hr |
| Nov 15, 3:33 PM EST | Mesoscale Discussion | SPC | 2 hr |
| Nov 15, 4:56 PM EST | Severe Thunderstorm Warning | LWX | 64 min |
| Nov 15, 5:35 PM EST | Severe Thunderstorm Watch | SPC | 5 hr |
| Nov 15, 5:37 PM EST | Severe Thunderstorm Warning | LWX | 68 min |
| Dec 13, 2:25 PM EST | Winter Weather Advisory | LWX | 23 hr |
| Dec 14, 4:43 AM EST | Winter Storm Watch | LWX | 35 hr |
| Dec 15, 4:09 AM EST | Winter Storm Warning | LWX | 46 hr |
| Dec 16, 1:57 PM EST | Mesoscale Discussion | SPC | 5 hr |
| Dec 21, 4:21 AM EST | Dense Fog Advisory | LWX | 8 hr |
| Dec 23, 4:27 AM EST | Flash Flood Watch | LWX | 47 hr |
| Dec 23, 9:07 PM EST | River Flood Watch | LWX | 56 hr |
| Dec 24, 11:47 AM EST | River Flood Watch | LWX | 31 hr |
| Dec 24, 7:21 PM EST | River Flood Warning | LWX | 11 hr |
| Dec 24, 9:04 PM EST | Areal Flood Warning | LWX | 12 hr |
| Dec 25, 1:54 PM EST | Areal Flood Warning | LWX | 11 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 | 44 |
| Tornado Warning | 3 |
| Severe Thunderstorm Watch | 8 |
| Tornado Watch | 2 |
| Mesoscale Discussion | 32 |
| Flooding | |
| Areal Flood Warning | 6 |
| Flash Flood Warning | 1 |
| River Flood Warning | 2 |
| Flash Flood Watch | 9 |
| Flood Watch | 2 |
| River Flood Watch | 2 |
| Winter | |
| Snow Squall Warning | 2 |
| Winter Storm Warning | 1 |
| Winter Storm Watch | 1 |
| Winter Weather Advisory | 3 |
| Heat | |
| Heat Advisory | 3 |
| Cold | |
| Freeze Warning | 6 |
| Freeze Watch | 6 |
| Frost Advisory | 6 |
| Wind and dust | |
| Wind Advisory | 10 |
| Fog and smoke | |
| Dense Fog Advisory | 15 |
The busiest days
Days with the most alerts issued, by UTC date.
Nearby
Alerts in force nowTornadoes on recordForecastThe radar archive20192021
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.