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Suspending daily monitoring-Daily Potomac flow and demand update (Tuesday 2021-08-17)

Up to 2 inches of rain fell in some areas of the basin in the past 24 hours. 1 to 2.5 inches of rain is expected in the next 72 hours.

CO-OP is suspending daily drought monitoring because flow at the US Geological Survey’s gage at Point of Rocks, Maryland has risen above the 2000 cfs monitoring threshold. Thank you for your daily submission of withdrawal and reservoir storage data. Although active monitoring has been discontinued, it is still helpful if you submit data on a daily basis to help us maintain, update, and verify our forecast tools.

Daily Potomac flow and demand update (Monday 2021-08-16)

Up to half an inch of precipitation fell in some areas of the basin in the past 24 hours. Over the next three days, one to four inches of rain is expected in the basin depending on location.

Daily Potomac flow and demand update (Sunday 2021-08-15)

Over the past 24 hours, the Potomac Basin received 0.1 to 0.5 inches of rain. Depending on location, some isolated areas saw as much as 2 inches. In the next 72 hours, an additional 0.25 to 1.25 inches of rain is possible.

Daily Potomac flow and demand update (Saturday 2021-08-14)

Over the past 24 hours, the Potomac Basin received 0.1 to 2 inches of rain, depending on location. 0.5 to 2 inches of rain are expected in the next 72 hours.

Daily Potomac flow and demand update (Friday 2021-08-13)

Zero precipitation occurred in the basin over the past 24 hours. The Potomac basin has been experiencing a heat advisory that is expected to continue into today.

Daily Potomac flow and demand update (Thursday 2021-08-12)

Scattered precipitation across the basin over the past 24 hours resulted in varied totals, up to 1.75 inches. Up to an inch of rain is expected over the next three days.

Note a correction to the Broad Run discharge for August 10th: the correct value is 6 MGD.

Daily Potomac flow and demand update (Wednesday 2021-08-11)

River flows have responded to yesterday’s storm events. Precipitation in the basin over the past 24 hours was scattered, with trace amounts in most areas but up to an inch and a half in some locations. The National Weather Service forecast calls for accumulations of 0.10 to 0.50 inches in the basin during the next three days.

Daily Potomac flow and demand update (Tuesday 2021-08-10)

Scattered locations across the upper Potomac Basin received between 0.1 and 0.5 inches of rain over the past 24 hours. Small portions of the basin near Washington D.C received up to 2 inches of rain. 0.1 to 1.5 inches of rain are expected over the next 3 days.
Adjustments made yesterday to the Little Falls gage’s rating curve resulted in discharge values lower than previously reported.

Daily Potomac flow and demand update (Saturday 2021-08-07)

The Potomac basin upstream of Little Falls dam received no significant precipitation over the past 24 hours. The forecast for the next 3 days is 0.01 to 0.10 inches throughout much of the basin, though up to 0.50 inches is expected in the southeastern portion of the basin, including in the Washington, DC, metropolitan area.

Daily Potomac flow and demand update (Friday 2021-08-06)

Less than a quarter inch of rain fell in portions of the upper basin over the past 24 hours. Scattered locations with higher precipitation amounts of up to one inch also occurred. Trace amounts, up to 0.1 inches, of rain are expected over the next three days. Flows remain steady above 1,500 cfs.

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