The Weekly Precipitation (click here) map shows the amount of precipitation that has accumulated within the last 7 days. The precipitation imagery displays precipitation estimates in colorized contoured bands by interpreting the intensity levels of NOWrad mosaic rainfall estimates each hour. These daily summaries provide a cumulative precipitation estimate from 1200GMT yesterday to 1200 GMT (daily) or 1200 GMT 7 days ago to 1200 GMT today (weekly).
Additionally, there have been high winds throughout the country. Wind driven water is powerful water. There is little doubt high wind velocities played a part in the need for the spillway in the first place.
The 10-Day Precipitation Departure map shows areas where precipitation is expected to be above, below, or near normal for the next 10 days.