Situational Awareness (Thursday, 2023-10-26)
According to the Middle Atlantic River Forecast Center predictions, there is no precipitation expected over the next three days. The week-long outlook expects a total of approximately 0.1 inches of rain in the basin.
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: 0.32 (inches)
Daily flows:
Little Falls gage flow 2023-10-25: 814 MGD (1260 cfs)
Little Falls gage flow 2023-10-26: 737 MGD (est., based on recently available real-time data) (1140 cfs)
Note: Gage flow at Little Falls is measured after water supply withdrawals.
Point of Rocks flow 2023-10-25: 853 MGD (1320 cfs)
Point of Rocks flow 2023-10-26: 847 MGD (est., based on recently available real-time data) (1310 cfs)
Yesterday's Washington metropolitan area Potomac River withdrawals and discharges (2023-10-25):
Fairfax Water Corbalis withdrawal - Potomac: 90 MGD
WSSC Water Potomac withdrawal: 128 MGD
Washington Aqueduct withdrawal - Great Falls: 34 MGD
Washington Aqueduct withdrawal - Little Falls: 93 MGD
Loudoun Water withdrawal: 5 MGD
Loudoun Water Broad Run discharge: 6 MGD
Total Potomac withdrawal: 351 MGD
Total net Potomac withdrawal: 345 MGD
Loudoun Water Potomac River (PR) flow values for drought operations protocol (based on yesterday's flows):
QPR: 1320 cfs
QPR, obs: 1320 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.