NAM Sea Level Pressure Trends
Displayed below are 6-h forecasts of MSLP from the most recent 00Z or 12Z NAM model run (thick dark green contours)
from F00-F84. To assist in visualizing model trends, forecasts from the NAM runs initialized 12 h and 24 h earlier are
overlain at the same valid time. The thickness and darkness of the contours decreases with the age of each model run.
The user can select a difference field between the current NAM run and that from the NAM run 12 h or 24 h ago.
The difference is shaded according to the color scale at the bottom left.