The Time line controls at the bottom of the Graph tab in the Stations View include:
Two small triangles at the time line indicating the start and end time.
The blue line shows the displayed time period.
You can use the triangles to view a shorter period and thus "zoom in" on the data:
Click and drag the small triangles at the
ends of the time slider with the mouse:
The time displayed above the slider triangle shows the end or start
time of the displayed data.
To display the start time and the end time
simultaneously, click the time line between the triangles:
To move the selected shorter time period, drag the selected blue line in either direction.
When available, you can also view forecast data in the Graph tab:
Slide the time slider to a time point in the future.
The screen is divided into two parts with different background patterns: Observed data on the left and forecast data on the right.
The following features show that the displayed parameters are forecast data, not observed data:
The graph lines of the forecast data turn into dotted lines.
The background of the graph changes pattern (the right side of the graph).
The mouse-over details of the graph lines include the text "Forecast".
You may also have separate forecast items available in the list at the upper right corner:
Click the Add icon 
and look for items indicating forecast data, for example, "Air
Temperature Forecast (Issuer and
Issue Time).
When available, you can compare forecasts
with different issue times by opening all of them.
NOTE: Forecast data will only be displayed if provided by your forecast provider.
See also: