JPATS Weather - NETC

JPATS AVIATION WEATHER BOOKLET
both a cold front and a warm front, the weather associated with the occlusion will be a
combination of both types of frontal weather.
Figure 3-14 — Occluded Front
Figure 3-14 depicts a profile of an occluded front. If either type of occlusion is approached from
the east, you would first encounter warm front type weather which may extend for several
hundred miles to the east of the surface front. On the other hand, if it were approached from the
west you would first encounter cold front type weather. The location of the occluded front is
significant to aircrews because the most severe weather, including ceilings and visibilities, is
generally located in an area 100 NM south to 300 NM north of the frontal intersection.
Figure 3-15 illustrates the stages of development of an occlusion.
Inactive Fronts
Figure 3-15 — Occluded Wave Formation
Version 3.2/Dec 08 3-15