Weather Service says flooding severity increases from minor to major.
Flood Watch National Weather Service Baltimore MD/Washington DC 1116 AM EDT Tue Aug 31 2021 ...Forecast flooding changed from Minor to Major severity and increased in duration for the following rivers in Maryland... Monocacy River near Frederick affecting Frederick MD zone. For the Monocacy River...including Frederick...flooding is possible. PRECAUTIONARY/PREPAREDNESS ACTIONS... Stay tuned to further developments by listening to your local radio, television, or NOAA Weather Radio for further information. By The National Weather Service, Sterling, Va.