Ch 19 Air Pressure and Wind Study Guide
Terms in this set (50)
is the force exerted by the weight of air above
What is exerted upward, downward, and sideways ?
What pushes down on an object and exactly balances it pushing up on the object?
What flows from areas of higher pressure to areas of lower pressure?
sea level pressure
this standard is 1013.2 millibars
when air pressure increases, the mercury in the tube rises; invented by Torricelli
lines on a map that connect points of equal pressure
the principal cause for variations in air pressure from place to place
What is the ultimate energy source for most wind?
What is the force that generates winds?
The Corolis effect, friction, and pressure gradients(differences) all influence or control what?
steep pressure gradient
produces strong winds
influences wind direction, the stronger the wind, the greater the deflection of
What causes the deflection of wind due to it is strongest at the poles?
high-altitude, high-velocity"rivers" of air
low-pressure systems - N.Hemisphere
winds blow counterclockwise toward the center
low-pressure systems - S. Hemisphere
winds blow clockwise toward the center.
general movement across the US is from west to east
Northern Hemisphere - the winds blow clockwise outward from the center
Air subsides in the center of this
What is associated with descending air, clear weather, & relatively dry conditions?
continuous pressure belt
located in the Southern Hemisphere because there are no landmasses to interrupt it
centers of low pressure
value of the isobars increase from the outside toward the center; centers of high pressure
causes a net flow of air inward around a cyclone and outward around an anticyclone
seasonal changes in wind direction associated with large landmasses and adjacent water bodies; occur during summer in India
an example of this is the deserts of the Sahara and the deserts of Australia
a pressure zone associated with rising air near the equator
How are winds labeled?
they are labeled according to the direction from which they blow
caused by topographical or variations in surface composition in the immediate area
generated because the warmer air on the mountains is less dense and glides up along the slope generating a breeze
examples of local winds; after sunset in mountainous areas, cold air moves downslope into the valley
usually originates during the day and flows toward the land
What is most intense during mid to late afternoon?
usually originates during the evening and flows toward the water
winds that consistently blow more often from one direction than from any other
move weather across the US from west to east
instrument that is used to measure wind speed
phenomenon associated with surface temperatures in the eastern Pacific that are colder than average
phenomenon associated with surface temperature in the eastern Pacific that are warmer than average
Closely spaced "what" indicate high winds?
Widely spaced "what" indicates light winds?
What deflects all free- moving objects to the right of their path of motion in the Northern Hemisphere?
If the Earth didn't rotate then the air at the equator would rise and move toward the poles. What is this called?
Where does the land heat up more during the daylight hours than does the adjacent body of water?
In coastal areas during the summer
What can impact the fishing industry, climate and the farming industry?
What is the opposite of El Niño
What happens at irregular intervals of 3 to 7 years?
What is the weather that accompanies a drop in barometric pressure?
What is the weather that accompanies a rise in barometric pressure?