About Seasonal Water Supply Forecast Evolution Plot
Forecast users are frequently interested in how forecasts and observed streamflow amounts change during the course of the forecasting year. This interactive forecast evolution plot allows users to plot forecasts, monthly observed streamflow, accumulated observed streamflow, and/or raw ensemble forecasts in a single customizable plot. The forecasts shown on this plot are the official National Weather Service water supply forecasts.
There are a variety of graph options to customize this plot in the right-hand navigation bar. The graphic below illustrates the placement of each option on the graph. A range of years or single year can be displayed for a specified forecast period, the span the forecast is valid. The forecast issuance date, the month and year the forecasts were created, are plotted along the x-axis.