IRFP-01
Metro Review
C. Stationary front
1. Characteristics: same as warm front, only less intense—can
persist in an area for many days
2. Winds flow parallel to the front, but in opposite direction to each
other—no prevailing wind to push front in any direction
D. Occluded fronts: form when faster-moving front overtakes a slower
front
1. Cold front occlusion
Fig 3: Cold Front
Occlusion
a. Characteristics
(1) Rain or freezing rain
(2) Poor visibility from fog and low ceilings
(3) Embedded thunderstorms
b. Formation
(1) Forms when cold front contains air colder than the
airmasses on both sides of the warm front and slides
under the entire warm front
(2) Produces warm and cold front systems aloft, with the cold
front extending to the surface
(3) Form predominantly over land
c.
Wind changes
(1) Before passage, wind flows parallel to the front from higher
to lower pressure
(2) After passage of overtaking cold front, wind flows
perpendicular to overtaking front
2. Warm front occlusion
Fig 4: Warm Front
Occlusion
a. Characteristics
(1) Rain or freezing rain
(2) Poor visibility from fog and low ceilings
(3) Embedded thunderstorms
(8-97) Original
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