Monitoring Reports

Yesterday there was scattered precipitation across the basin that produced approximately 0.25 to 0.50 inches of rain in the headwaters area, according to the National Weather Service's Middle Atlantic River Forecast Center . Over the next 48 hours, the River Forecast Center predicts an accumulation of up to 0.5 inches of precipitation. The 5-day Quantitative Precipitation Forecast shows a chance of up to 1.5 inches of accumulated rainfall.

Potomac River flows at Point of Rocks and Little Falls have risen due to the recent storms in the eastern portion of the basin. The National Weather Service's Middle Atlantic River Forecast Center reports 1/2 inch to 3/4 inches of rain in a few locations in the eastern part of the basin over the past 24 hours, and predicts accumulations of between 1/4 and 1/2 inches in the watersheds of the North and South Branches of the Potomac over the next 48 hours.

There was a significant storm over the majority of the basin yesterday. Most locations received 0.75 to 1.5 inches of rain; other locations received as much as 2 to 3 inches of rain. The National Weather Service 48-hour forecast predicts between 0.1 and 0.25 inches of rainfall over much of the basin. The 5-day Quantitative Precipitation Forecast indicates a chance of 0.75 to 1.6 inches of rainfall over much of the basin.

There was a significant storm over the northeast portion of the basin this morning with up to 2 inches of rain seen in some locations. The National Weather Service 48-hour forecast predicts 0.25 inches in the western areas of the basin and up to 1 inch in the eastern portion. The 5-day quantitative precipitation forecast indicates a chance of over 2 inches of accumulated rainfall over much of the basin. Many of the USGS gages are not currently reporting flow for yesterday and have not been updated with real-time information since around 1:00 am this morning.

There was no rainfall in the Potomac River Basin over the past 24 hours. National Weather Service forecasts predict accumulations of 1/10 to 1/4 inches of rain over the next 48 hours in portions of the Potomac Basin. The Mid-Atlantic River Forecasting Center quantitative precipitation forecasts (qpfs) indicate that the entire Basin will receive amounts between 1 and 1.5 inches over the next 5 days. USGS real-time data show a steep drop in flow at Little Falls this morning.

There was no significant rainfall in the Potomac River basin over the past 24 hours. National Weather Service forecasts predict 1/10 of an inch of rain over the next 48 hours in portions of the Potomac basin. The Mid-Atlantic River Forecasting Center quantitative precipitation forecasts (qpfs) indicate that the entire basin will receive amounts between 1 and 1.75 inches over the next 5 days. The U. S. Geological Survey observed flows suggest that flow at Little Falls will hold steady for the next couple of days.

There was no significant rainfall in the Potomac River basin over the past 24 hours. Weather forecasts have not changed since yesterday. National Weather Service forecasts predict accumulations of 1/10 to 1/4 inches of rain over the next 48 hours in the headwaters of the Shenandoah and the South Branch of the Potomac, and 1/10 to 1/2 inches over the entire basin during the next 5 days.

There was no significant rainfall in the Potomac River basin over the past 24 hours. National Weather Service forecasts predict accumulations of 1/10 to 1/4 inches of rain over the next 48 hours in the headwaters of the Shenandoah and the South Branch of the Potomac, and 1/10 to 1/2 inches over the entire basin during the next 5 days.

Fast-moving thunderstorms went through the Washington region yesterday. Approximately 0.5 to 1.5 inches of rain fell in Prince Georges County, Montgomery County, Washington, D.C. and Northern Virginia. Other areas in the basin received lesser amounts of rainfall (0 and 0.5 inches) in the past 24 hours. The NOAA National Weather Forecast does not expect any showers or thunderstorms through the weekend.

Flow at Point of Rocks has staid fairly steady over the past couple of days. In contrast, flow at Little Falls has risen due to recent rainfall but may fall in the near future. Yesterday, precipitation amounts of 1 to 1.5 inches fell near northern Frederick, Carroll, Baltimore, and some neighboring counties and down near the Washington, D.C. area. But most of the basin received 0 to 0.5 inches of rain. Scattered showers and thunderstorms are expected throughout the basin for the next several days.