Metro-01
Review of Basic Meteorological Principles
b. Advection: forms when moist air moves over surface cool
enough to reduce temperature to near dew point (more
frequent in winter than summer)
(1) Occurs usually near coastal regions of the southeastern
United States, the Gulf Coast, and the Pacific Northwest
(2) Intensity increases rather than lessens with wind
NOTE: Advection fog is common to NAS Kingsville.
c.
Precipitation: formed by rain or drizzle evaporating and adding
moisture to air
(1) Usually associated with warm front where warm rain falls
into colder air
(2) Can form quickly and cover a wide area
(3) Can be very dense and can continue for several days
d. Upslope (closely related to advection fog)
(1) Occurs along windward slopes of mountain ranges when
saturated air ascends up a mountain slope and condenses
(2) The wider the spread between temperature and dew point
at the base of the mountain, the farther up the slope it will
form
e. Steam—forms when cold air moves over much warmer water,
causing intense evaporation and raising dew point to near
ambient temperature
f.
Ice
(1) Formed by ice crystals suspended in air
(2) Decreases visibility in bright sunlight
(3) Most common in arctic regions
4. Hazards
(1) Low to extremely low visibility
(2) Can form quickly
(3) Can affect a widespread area
(7-97) Original
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