Light rain is forecast in the Potomac basin over the next three days, with accumulations of up to 0.25 inches predicted for some areas. Longer range forecasts indicate heavier rain – with accumulations of about an inch - 6 and 7 days in the future.
Recent basin-wide average precipitation (above Little Falls):
(based on CO-OP's Low Flow Forecast System analysis of Middle Atlantic River Forecast Center (MARFC) gridded multisensor precipitation estimates)
Yesterday's area-weighted average basin precipitation: 0 (inches)
Past 3-day cumulative area-weighted average basin precipitation: 0 (inches)
Past 7-day cumulative area-weighted average basin precipitation: 0.2 (inches)
Daily flows:
Little Falls gage flow 2022-11-05: 1254 MGD (1940 cfs)
Little Falls gage flow 2022-11-06: 1176 MGD (est., based on recently available real-time data) (1820 cfs)
Note: Gage flow at Little Falls is measured after water supply withdrawals.
Point of Rocks flow 2022-11-05: 1209 MGD (1870 cfs)
Point of Rocks flow 2022-11-06: 1189 MGD (est., based on recently available real-time data) (1840 cfs)
Yesterday's Washington metropolitan area Potomac River withdrawals and discharges (2022-11-05):
Fairfax Water Corbalis withdrawal (Potomac): 69 MGD
WSSC Water Potomac withdrawal: 121 MGD
Washington Aqueduct withdrawal: 138 MGD
Loudoun Water withdrawal: 14 MGD
Loudoun Water Broad Run discharge: 6 MGD
Total Potomac withdrawal: 342 MGD
Total net Potomac withdrawal: 337 MGD
Loudoun Water Potomac River (PR) flow values for drought operations protocol (based on yesterday's flows):
QPR: 1870 cfs
QPR, obs: 1870 cfs
QPR, WS: 0 cfs
Interstate Commission on the Potomac River Basin