Monitoring Reports

No rain fell in the basin over the past 24 hours. The National Weather Service (NWS) 3-day forecast predicts accumulations of 0.5 to 1 inch of rain across the basin. The NWS 5-day forecast predicts accumulations of up to 1.75 inches of rain in the Potomac basin.

Daily Flows:
Little Falls gage flow 2017-10-21: 1280 MGD (1980 cfs)
Little Falls gage flow 2017-10-22: 1170 MGD (est., based on recently available real time data) (1810 cfs)
Note: Gage flow at Little Falls is measured after water supply withdrawals.

No rain fell in the basin over the past 24 hours. Flow at Point of Rocks is currently at about 1900 cfs. The National Weather Service (NWS) 3-day forecast predicts accumulations of 0.01 to 0.10 inches in the western part of the Potomac basin. The NWS 5-day forecast predicts accumulations of up to 1.25 inches of rain in the Potomac basin.

Flow at Point of Rocks is currently at about 2000 cfs, CO-OP's trigger for daily drought monitoring. No rain fell in the basin over the past 24 hours, and no rain is expected over the next 72 hours, according to the Middle Atlantic River Forecast Center's quantitative precipitation forecasts. The National Weather Service (NWS) 5-day forecast predicts accumulations of up to 1.25 inches of rain in the Potomac basin.

Point of Rocks flow is at 3110 cfs. Within the last 24 hours, the Potomac basin has received up to 0.1 inches of precipitation. The National Weather Service (NWS) 3-day forecast predicts accumulations of 0.25 inches of rain in the Potomac basin above Little Falls.

With rain continuing to fall across much of the basin, and Point of Rocks flow being above the low flow monitoring threshold of 2,000 cfs, daily monitoring will be discontinued until further notice. Thank you to all for your contribution to the monitoring efforts.

The National Weather Service (NWS) 24 hour observed precipitation shows that there was 0.10 to 1.75 inches of rain in the Potomac basin above Little Falls. The NWS 3-day forecast predicts accumulations of 0.01 to 0.75 inches of rain over this same area. The US Geological Survey shows that Point of Rocks flow has remained above 2,000 cfs, our trigger for daily monitoring, since yesterday. The NWS Global Ensemble Forecast System simulations predict that flow at Point of Rocks will continue to rise above 2,000 cfs for the next couple of days.

The National Weather Service (NWS) 24 hour observed precipitation shows that there was 0.00 to 0.50 inches of rain in the Potomac basin above Little Falls. The NWS 3-day forecast predicts accumulations of 0.50 to 1.50 inches of rain over this same area. The US Geological Survey shows that Point of Rocks flow has been fluctuating around 2,000 cfs, our trigger for daily monitoring, since yesterday. The NWS Global Ensemble Forecast System simulations predict that flow at Point of Rocks will continue to rise above 2,000 cfs.

The National Weather Service (NWS) 24 hour observed precipitation shows that there was 0.00 to 1.50 inches of rain in the Potomac basin above Little Falls. The NWS 3-day forecast predicts accumulations of 0.25 to 1.25 inches of rain over this same area. The NWS Global Ensemble Forecast System simulations predict that flow at Point of Rocks will temporarily rise above 2,000 cfs, our trigger for daily drought monitoring, as earlier as sometime today.

The National Weather Service (NWS) 24 hour observed precipitation shows that there was 0.25 to 1.75 inches of rain in the Potomac basin above Little Falls. The NWS 3-day forecast predicts accumulations of 0.40 to 1.75 inches of rain over this same area. The NWS Global Ensemble Forecast System simulations predict that flow at Point of Rocks will rise above 2,000 cfs, our trigger for daily drought monitoring, over the coming week.

According to the Middle Atlantic River Forecast Center's observed precipitation, there was 0.01 to 0.25 inches of precipitation above the Point of Rocks streamflow gage over the last 24 hours. The National Weather Service (NWS) 3-day forecast predicts accumulations of 0.75 to 1.75 inches of rain in the Potomac basin above Little Falls. The NWS Global Ensemble Forecast System simulations predict that flow at Point of Rocks will rise above 2000 cfs, our trigger for daily drought monitoring, over the coming week.

The National Weather Service (NWS) 3-day forecast predicts accumulations of 1 1/4 to 2 inches of rain in the Potomac basin above Little Falls. The NWS Global Ensemble Forecast System simulations predict that flow at Point of Rocks will rise above 2000 cfs, our trigger for daily drought monitoring, over the coming week.