Monitoring Reports

This email reports observed flows and demands as part of ongoing drought operations. A separate email will be provided with today's information for the annual drought exercise.

The National Weather Service reports that 0.1 to 1.5 inches of rain fell in the basin in the last 24-hour period. A few small areas of the basin received as much as 1.75 inches of rain in the last 24-hour period. There is 0 to 0.5 inches of rain in the 72-hour forecast. The 7-day forecast indicates accumulations between 0.1 and 1.5 inches of rain possible across the basin.

SIMULATED SCENARIO: The weather forecast and operational recommendations are unchanged from this morning's email. Potomac River flows are still elevated due to the Derecho event. Suppliers have been requested to take advantage of these flows and to conserve reservoir storage. However, we anticipate that flows will begin to fall to near pre-Derecho levels by Sunday.

THE FLOWS, DEMANDS, AND DISCHARGES REPORTED BELOW REFLECT ACTUAL CONDITIONS:

This email reports observed flows and demands as part of ongoing drought operations. A separate email will be provided with today's information for the annual drought exercise.

The National Weather Service reports that no rain fell in the basin in the last 24-hour period. There is a chance of 1/4 to 1/2 an inch of rain in the 24-hour forecast. The 7-day forecast indicates accumulations between 3/4 and 1 inch of rain is possible across the basin.

SIMULATED SCENARIO: Last night's Derecho event continues to impact the area; however, precipitation has ended. Communications are still only available via email. Due to rainfall associated with the event, flows at Little Falls have risen to 570 mgd. WSSC will shut off the release from Little Seneca Reservoir if they can access the dam. Everyone else is proceeding with operational requests to shift back to the Potomac River as much as possible to take advantage of elevated flows.

THE FLOWS, DEMANDS, AND DISCHARGES REPORTED BELOW REFLECT ACTUAL CONDITIONS:

This email reports observed flows and demands as part of ongoing drought operations. A separate email will be provided with today's information for the annual drought exercise.

Only trace amounts of rain fell over the Potomac basin over the past 24 hours. The Middle Atlantic River Forecast Center predicts accumulations of 1/10 to 1/2 inch in the basin over the next 72 hours. Potomac River flow at Point of Rocks is beginning to rise due to the USACE's Sep 27-28 Artificially Varied Flow (AVF) release from the North Branch reservoirs.

SIMULATED: Today's high temperature forecast is 104 degrees F. Scattered thunderstorms are expected this afternoon and evening, and the National Weather Service has issued a severe weather watch for the Baltimore-Washington region. Operational recommendations remain the same as reported in this morning's email.

THE FLOWS, DEMANDS, AND DISCHARGES REPORTED BELOW REFLECT ACTUAL CONDITIONS:

This email reports observed flows and demands as part of ongoing drought operations. A separate email will be provided with today's information for the annual drought exercise.

The National Weather Service reports that rain fell across the entire basin over the last 24 hours. Accumulation totals range from trace amounts to 1.25 inches. There may be an additional accumulation of trace amounts today. The 72-hour forecast indicates the basin may receive between one- and three-quarters of an inch of rain.

The weather conditions and forecasts and operational recommendations remain the same as reported in this morning's email.

THE FLOWS, DEMANDS, AND DISCHARGES REPORTED BELOW REFLECT ACTUAL CONDITIONS:

Daily Potomac flow and demand update (Tuesday 09/30/2014)

Only trace amounts of precipitation fell in the Potomac basin over the past 24 hours. The Middle Atlantic River Forecast Center forecasts accumulations ranging from 0 to 3/4 inches in the basin over the next 72 hours. The National Weather Service's Weather Prediction Center forecasts over an inch of rain in the western portion of the basin over the next 5 days.

The National Weather Service reports that 0 to a 0.25 inch of rain fell across the basin over the last 24 hours. The Middle Atlantic River Forecast Center predicts 0 to a 0.25 inch of rain over the next 72 hours, and the and the National Weather Service predicts 0.1 to 1 inch of rain over the 7 days.