Alert archive / Maryland / Flash Flood Warnings / 2021
Flash Flood Warnings in Maryland, August 2021
14 flash flood warnings in August 2021. An alert counts here when it covered any part of the state, so the counties below add up to more than the state. The archive of flash flood warnings reaches back to 1986.
Flash Flood Warnings by county
Each county as a circle sized by its count in August 2021. Tap one for its archive.
- Flash Flood Warnings
- 14
- Busiest day
- August 20, 20214 flash flood warnings
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 | Counties | Lasted |
|---|---|---|---|---|
| Aug 9, 4:59 PM EDT | Flash Flood Warning | PHI | Caroline, Queen Anne's | 79 min |
| Aug 9, 6:39 PM EDT | Flash Flood Warning | LWX | Montgomery, Prince George's | 3 hr |
| Aug 14, 10:44 PM EDT | Flash Flood Warning | LWX | Calvert, Charles, Prince George's | 3 hr |
| Aug 15, 12:13 AM EDT | Flash Flood Warning | LWX | Prince George's | 3 hr |
| Aug 15, 12:42 AM EDT | Flash Flood Warning | LWX | Montgomery, Prince George's | 2 hr |
| Aug 16, 5:24 PM EDT | Flash Flood Warning | LWX | Prince George's | 2 hr |
| Aug 16, 8:47 PM EDT | Flash Flood Warning | LWX | Washington | 2 hr |
| Aug 16, 9:04 PM EDT | Flash Flood Warning | LWX | Allegany | 2 hr |
| Aug 16, 11:32 PM EDT | Flash Flood Warning | LWX | Montgomery | 3 hr |
| Aug 18, 11:59 PM EDT | Flash Flood Warning | LWX | Cecil | 2 hr |
| Aug 20, 4:52 AM EDT | Flash Flood Warning | LWX | Frederick | 102 min |
| Aug 20, 7:55 AM EDT | Flash Flood Warning | LWX | Montgomery | 2 hr |
| Aug 20, 8:16 AM EDT | Flash Flood Warning | LWX | Montgomery | 111 min |
| Aug 20, 8:21 AM EDT | Flash Flood Warning | LWX | Montgomery, Prince George's | 101 min |
By county
Every county with at least one alert. A county page lists each alert that covered it.
Nearby
Alerts in force nowTornadoes on recordThe 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. Warning verification from the Mesonet's Cow. Rebuilt daily.