There was no rain in most of the Potomac basin over the past 24 hours, but according to Middle Atlantic River Forecast Center (MARFC) estimates, 0.25 to 0.50 inches of rain fell in a few isolated locations in the western part of the basin yesterday. Forecasts call for the dry conditions to continue, but the MARFC predicts precipitation accumulations of over 0.10 inches in the far western portion of the basin over the next 3 days.
REVISION 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 precip: 0.04456 (inches)
Past 3-day cumulative area-weighted average basin precip: 0.06203 (inches)
Past 7-day cumulative area-weighted average basin precip: 0.11922 (inches)
Daily Flows:
Little Falls gage flow 2019-09-29: 1015 MGD (1570 cfs)
Little Falls gage flow 2019-09-30: 937 MGD (est., based on recently available real time data) (1450 cfs)
Note: Gage flow at Little Falls is measured after water supply withdrawals.
Point of Rocks flow 2019-09-29: 1066 MGD (1650 cfs)
Point of Rocks flow 2019-09-30: 1086 MGD (est., based on recently available real time data) (1680 cfs)
Yesterday's Net Potomac withdrawal (2019-09-29):
FW Corbalis withdrawal (Potomac): 130 MGD
WSSC Potomac withdrawal: 146 MGD
Aqueduct withdrawal: 151 MGD
Loudoun withdrawal: 9 MGD
Total Potomac withdrawal: 436 MGD