Yellow areas denote where there is a good chance (50% or better) of occasional moderate or greater clear-air turbulence (CAT). Red shows where there is a high risk of occasional moderate or greater CAT. There is little or no correlation between high index values and the likelihood of severe turbulence. The valid time of the image is shown in the lower right. Aircraft reports plotted on the 12 or 18 hr forecast show turbulence intensity in yellow (0 = None, 1=light, 2=light/moderate, 3=moderate, 4=moderate/severe, 5=severe, 6=extreme), aircraft type in cyan, and flight altitude (feet) in white. The GFS and NAM models are both updated by 1 PM and 1 AM EST daily. RUC-2 products are updated hourly (currently only between 0000 and 1800 UTC).

Archive images are available for the 12 hr forecast at both 0000 and 1200 UTC. The format is: hhZyyyyjjj.GIF where hh is model time, yyyy is year, and jjj is Julian day