Adams County, PA, and nearby areas saw some rain yesterday. According to the Middle Atlantic River Forecast Center, accumulations of up to 1/10 inches are expected in the far northern portion of the Potomac basin over the next 3 days, primarily in Pennsylvania. The 7-day forecast is not as promising as it was a few days ago, but accumulations of 1/4 to 3/4 inches are expected throughout most of the basin, mostly occurring Sunday through Tuesday.
River flow at Point of Rocks briefly exceeded CO-OP's drought monitoring threshold of 2000 cfs over the past couple days, due to the recent rain and the arrival of the USACE's recreational release last Saturday from Savage Reservoir.
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: 0.03513 (inches)
Past 3-day cumulative area-weighted average basin precip: 0.03563 (inches)
Past 7-day cumulative area-weighted average basin precip: 0.44644 (inches)
Daily Flows:
Little Falls gage flow 2019-10-03: 1215 MGD (1880 cfs)
Little Falls gage flow 2019-10-04: 1338 MGD (est., based on recently available real time data) (2070 cfs)
Note: Gage flow at Little Falls is measured after water supply withdrawals.
Point of Rocks flow 2019-10-03: 1293 MGD (2000 cfs)
Point of Rocks flow 2019-10-04: 1222 MGD (est., based on recently available real time data) (1890 cfs)
Yesterday's Net Potomac withdrawal (2019-10-03):
FW Corbalis withdrawal (Potomac): 115 MGD
WSSC Potomac withdrawal: 129 MGD
Aqueduct withdrawal: 168 MGD
Loudoun withdrawal: 10 MGD
Total Potomac withdrawal: 422 MGD