According to Middle Atlantic River Forecast Center (MARFC) map products, there was no significant precipitation in the basin over the past 24 hours. MARFC predicts accumulations of trace amounts to ¼ inch over the next three days.
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: 0.07 (inches)*
Past 7-day cumulative area-weighted average basin precipitation: 0.07 (inches)*
* Occurred mostly in the Monocacy sub-basin.
Daily flows:
Little Falls gage flow 2022-10-25: 1260 MGD (1950 cfs)
Little Falls gage flow 2022-10-26: 1293 MGD (est., based on recently available real-time data) (2000 cfs)
Note: Gage flow at Little Falls is measured after water supply withdrawals.
Point of Rocks flow 2022-10-25: 1286 MGD (1990 cfs)
Point of Rocks flow 2022-10-26: 1293 MGD (est., based on recently available real-time data) (2000 cfs)
Yesterday's Washington metropolitan area Potomac River withdrawals and discharges (2022-10-25):
Fairfax Water Corbalis withdrawal (Potomac): 80 MGD
WSSC Water Potomac withdrawal: 94 MGD
Washington Aqueduct withdrawal: 139 MGD
Loudoun Water withdrawal: 11 MGD
Loudoun Water Broad Run discharge: 6 MGD
Total Potomac withdrawal: 325 MGD
Total net Potomac withdrawal: 319 MGD
Loudoun Water drought operations protocol river flow values (based on yesterday's flows):
QPR: 1990 cfs
QPR, obs: 1990 cfs
QPR, WS: 0 cfs
Note to Loudoun Water: See NWS ensemble flow forecasts (HEFS, GEFS, NAEFS) for Point of Rocks flow for the next 7 days – see https://www.weather.gov/erh/mmefs_marfc?id=PORM2&model=NAEFS.