This chart depicts jetstream winds at the 300mb level.
This product is a combination of two plots, a color contour indicating wind
speed (in knots), and a stream line plot indicating wind direction.
Rapid Update Cycle (RUC2) model
Colored contours indicate the wind speed at 300mb pressure altitude. A legend
is provided in the lower right-hand corner of the image to associate colors
with numerical speeds. Streamlines indicate the direction of the wind flow.