Alert archive / Maryland / Frederick County / 2021
Weather alerts in Frederick County, Maryland, September 2021
37 weather alerts in September 2021, from the National Weather Service and the Storm Prediction Center. An alert counts here when it covered this county.
- Alerts
- 37
- Warnings
- 27
- Watches
- 8
- Advisories
- 1
- Busiest day
- September 1, 20218 alerts
Over time
By day
Days in UTC, the clock the archive keeps.
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 |
|---|---|---|---|
| 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 |
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 | 5 |
| Severe Thunderstorm Watch | 1 |
| Tornado Watch | 2 |
| Mesoscale Discussion | 1 |
| Flooding | |
| Areal Flood Warning | 14 |
| Flash Flood Warning | 6 |
| River Flood Warning | 2 |
| Flash Flood Watch | 3 |
| River Flood Watch | 2 |
| Wind and dust | |
| Wind Advisory | 1 |
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.