Monitoring Reports

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.

The Middle Atlantic Forecast Center forecasts approximately an inch of rain in the basin over the next three days.

Daily Flows:
Little Falls gage flow 2017-10-05: 821 MGD (1270 cfs)
Little Falls gage flow 2017-10-06: 885 MGD (est., based on recently available real time data) (1370 cfs)
Note: Gage flow at Little Falls is measured after water supply withdrawals.

Point of Rocks flow 2017-10-05: 976 MGD (1510 cfs)
Point of Rocks flow 2017-10-06: 918 MGD (est., based on recently available real time data) (1420 cfs)

One to two inches of rain is expected over the next 7 days.

Daily Flows:
Little Falls gage flow 2017-10-04: 840 MGD (1300 cfs)
Little Falls gage flow 2017-10-05: 769 MGD (est., based on recently available real time data) (1190 cfs)
Note: Gage flow at Little Falls is measured after water supply withdrawals.

Point of Rocks flow 2017-10-04: 931 MGD (1440 cfs)
Point of Rocks flow 2017-10-05: 1034 MGD (est., based on recently available real time data) (1600 cfs)

The National Weather Services 7-day quantitative precipitation forecast continues to look promising.

Daily Flows:
Little Falls gage flow 2017-10-03: 808 MGD (1250 cfs)
Little Falls gage flow 2017-10-04: 814 MGD (est., based on recently available real time data) (1260 cfs)
Note: Gage flow at Little Falls is measured after water supply withdrawals.

Point of Rocks flow 2017-10-03: 885 MGD (1370 cfs)
Point of Rocks flow 2017-10-04: 873 MGD (est., based on recently available real time data) (1350 cfs)