Weather Studies eInvestigation 7A: Precipitation
Patterns
Cold, dry air is ______ warm, humid air. Consequently, lighter warmer air is forced to rise above
the sloping front overlying denser, colder air.
a. denser than
b. less dense than - ANS-denser than
Ascending unsaturated air ______, cooling at about 10°C per 1000 m of ascent (5.5°F per 1000
ft.).
a. expands
b. is compressed - ANS-expands
Warmer air rising above a front expands and cools as it ascends, and its relative humidity
______. If saturated, clouds develop and rain or snow may fall from those clouds.
a. increases
b. decreases
c. remains constant - ANS-increases
The relative humidity of saturated air is ______.
a. 50%
b. 98%
c. 100%
d. 105% - ANS-100%
Prevailing upper-level winds blow from west to east across the United States. Winds blowing
onshore from the Pacific Ocean are forced up the windward slopes of the Cascade Mountain
Range in the Pacific Northwest. Hence, the heaviest precipitation falls on the ______ slopes of
the Cascades.
a. eastern
b. western - ANS-western
Comparing Figure 7A-1 and Figure 7A-2, the air masses on either side of the Atlantic stationary
front had distinct differences in temperature and moisture. Dewpoints in central and southern
Florida on the southern side of the front had significantly ______ values than those in northern
Florida, Georgia, and Alabama.
a. lower
b. higher - ANS-higher
Given your answer to #6, there would be ______ available low-level water vapor on the
southern side of the front, to rise and condense as liquid water. Ian's extreme low pressure and
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