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Met. Ch 8

Terms in this set (50)

net convergence causes pressure in the air to _________ while net divergence causes pressure in the air to ___________
increase; decrease
if earth's gravitational force would increase, pressure at the earth's surface would ____________
increase
t/f - pressure will decrease with increasing height at the same rate in both columns
false
the surface pressures at the bases of warm and cold columns of air are equal. air pressure in the warm column of air will _______ with increasing height ______ than in the cold column
decrease; more slowly
suppose a parcel of air has a given temperature, pressure and density. if the parcels size remains the same as the temperature increases, then the air pressure inside the parcel will:
increase
suppose a very cold parcel of air at 5.5 km is compared to a similar (but warm) parcel of air at sea level. this means that the parcel at sea level has _________ pressure and __________ density
higher; higher
if two air parcels at the sea level have the same size but different temperatures, the colder parcel of air will have:
the same pressure but higher density than the warm parcel
gas law -
pressure is proportional to density times temperature
an altimeter measures:
pressure
the most common unit of pressure found on a surface weather map is:
millibars of hectopascals
a barometer measures:
pressure
which value correlates with 930mb of air pressure at 900m?
1020 mb
the most important correction for a mercury barometer is:
altitude
lines connecting points of equal pressure are called:
isobars
pressure changes:
more rapidly in the vertical direction rather than horizontally
on an isobaric surface, __________ is constant
pressure
low _______ on a constant height chart corresponds to low _________ on a constant pressure chart
pressure; heights
___________ _________ are drawn to represent horizontal changes in altitude which correspond to horizontal changes in pressure
contour lines
lines drawn on a 500mb chart are lines of constant:
altitude
warm air aloft is associated with constant pressure surfaces that are found at _________ altitude than normal and ________ the normal atmospheric pressure aloft
higher; higher
on an upper-level chart, normally we find warm air associated with ______ pressure and cold air associated with _______ pressure
high; k
a surface low pressure center is generally associated with ________ on an upper level isobaric chart
a trough
on an upper level chart, the wind tends to blow:
parallel to the isobars or contours
a ridge on an upper-level isobaric chart indicates
higher than average heights
t/f: on an isobaric weather chart, the spacing of the height contours indicates the magnitude of the pressure gradient force:
true
t/f: during a reversible adiabatic process, the pressure gradient force is parallel to the isobars
false
t/f: the coriolis force is the force that causes the wind to blow
false
_______ ________ does not have a direct effect on horizontal wind motions
gravitational force
wind direction is influenced by:
coriolis force; pressure gradient force; centripetal force
ciriolis ________ change the speed of the wind
cannot
pressure gradient -
the amount of pressure change that occurs over a given horizontal distance
the pressure gradient force is directed from higher pressure toward lower pressure __________ on earth
everywhere
pressure gradient force causes a stationary parcel of air:
begin to move horizontally
what produces the strongest coriolis force?
fast winds, high altitudes
the coriolis force is:
the apparent force caused by the earths rotation
rotation of the earth causes the:
coriolis force
the coriolis force is not strongest:
at the equator
suppose that winds aloft are geostrophic and blowing from the north. low pressure is located to the ________
east
if directly above you at 10k feet the wind is blowing from the south, then it is a good bet that at 10k feet, the center of lowest pressure is _______ of you, while the center of highest pressure is _______ of you
west; east
the vertical gradient force pressure is directed:
upward
the winds aloft in the middle Latitudes of the Southern Hemisphere generally blow:
from east to west
a surface low pressure area that moves from south to north directly east of your home would most likely produce winds that shift from:
NE to N to NW
the wind around a surface low pressure center in the Southern Hemisphere blows:
clockwise and toward the center
surface winds blow across the isobars at an angle due to:
the frictional force
if, at your home in the Northern Hemisphere, the surface wind is blowing from the northwest, then the region of lowest pressure will be to the _________ of your home
east
winds blow slightly inward:
around surface low pressure centers in the Northern and Southern hemispheres
the wind around a surface high pressure center in the northern hemisphere blows:
clockwise and outward from the center
we generally expect the air to be _________ above areas of surface low pressure and ______ above areas of surface high pressure
rising, sinking
1013mb
average sea level pressure
going up 100m decreases pressure by _______
10mb
THIS SET IS OFTEN IN FOLDERS WITH...