No significant rainfall occurred in the Potomac basin above Little Falls over the past day. According to the MARFC’s 72-hour forecast, total precipitation in the basin will range from 0.01 to 0.25 inches over the next three days, with more rain occurring in the southeastern portions of the basin (including the DC area) than in the northwestern portions.
Recent basin-wide average precipitation (above Little Falls):
Stream flows in the Potomac basin continue to slowly decline. According to the National Weather Service’s 7-day cumulative precipitation forecast, little rain is expected over the next week. There was a data gap in real-time flow at the USGS’s Point of Rocks gage yesterday, so yesterday’s daily average flow is estimated
According to Middle Atlantic River Forecast Center (MARFC) map products, there was 0.01 to 0.27 inches of rain in the basin over the past 24 hours. The LFFS average basin precipitation is 0.12 inches. MARFC predicts no rainfall over the next three days, although 0.25-0.75 inches of rain is expected in the 5 and 7-day forecasts.
Yesterday, WSSC Water temporarily provided all of the City of Rockville's water. WSSC Water is no longer serving them.
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.
According to Middle Atlantic River Forecast Center (MARFC) map products, there was no significant precipitation in the basin over the past 24 hours. The basin has been dry over the past three days, with the exception of the Monocacy sub-basin, which received up to ½ inch of rain. MARFC predicts accumulations of trace amounts to ¼ inch over the next three days.
CO-OP is initiating daily drought monitoring and reporting today because Potomac River flow at the US Geological Survey’s gage at Point of Rocks, Maryland, has fallen below 2000 cubic feet per second (cfs), CO-OP's daily monitoring threshold. According to National Weather Service's (NWS) quantitative precipitation forecasts, less than a 1/10 of an inch of rain is expected in the basin over the next 3 days.
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.
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 flows: Little Falls gage flow 2021-08-15: 1480 MGD (2290 cfs) Little Falls gage flow 2021-08-16: 1409 MGD (est., based on recently available real time data) (2180 cfs) Note: Gage flow at Little Falls is measured after water supply withdrawals.
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.
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.