River flow at Point of Rocks is expected to remain close to CO-OP’s daily monitoring threshold, 2000 cfs, for the next several days. The basin received negligible precipitation yesterday and no rain is forecast during the next three days.
Most parts of the Potomac basin above Little Falls received 1/10 to ½ inch of rain yesterday. River flows are already responding. However, the forecast is for dry conditions over the next 7 days, so we expect this slight increase in flows to be short-lived.
Daily flows:
Little Falls gage flow 2022-10-31: 1196 MGD (1850 cfs)
Little Falls gage flow 2022-11-01: 1209 MGD (est., based on recently available real-time data) (1870 cfs)
Over the past day, 0 to 0.1 inches of precipitation occurred in the Potomac basin above Little Falls; the majority occurred in the North Branch. According to the MARFC’s 72-hour forecast, total rainfall in the basin will range from 0.01 to 0.5 inches over the next three days, with more rain occurring in the southeastern portions (including the DC area) than in the northwestern parts.
Daily Potomac flow and demand update (Sunday, 2022-10-30)
Over the past day, no significant rainfall occurred in the Potomac basin above Little Falls. 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 (including the DC area) than in the northwestern portions.
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.