Chapter 19 - Air Pressure and Wind
Terms in this set (17)
the pressure caused by the weight of a column of air pushing down on an area
a device used for measuring air pressure
a line on a map connecting points having the same atmospheric pressure at a given time or on average over a given period.
the spacing of isobars indicates changes in air pressure.
describes how the Earth's rotation affects moving objects (wind, water, airplanes). Objects are deflected to the right in the Northern Hemisphere and to the left in the Southern Hemisphere.
a narrow, variable band of very strong, predominantly westerly air currents encircling the globe several miles above the earth.
center of low pressure - isobars increase in pressure as you move away from the center - bad weather
center of high pressure - isobars decrease in pressure as you move away from the center - fair weather
blow from the east in both hemispheres
NE Tradewinds - 0 degrees N - 30 degrees N
SE Tradewinds - 0 degrees S - 30 degrees S
blow from the west in both hemispheres
SWesterlies - 30oN - 60oN
NWesterlies - 30oS - 60oS
winds that plow from the polar high toward the subpolar low
N Polar Easterlies - 60oN - 90oN
S Polar Easterlies - 60oS - 90oS
Interaction of warm and cool air masses that produces a stormy belt in the middle latitudes
a seasonal prevailing wind in the region of South and Southeast Asia, blowing from the southwest between May and September and bringing rain (the wet monsoon ), or from the northeast between October and April (the dry monsoon ).
a wind from the direction that is predominant at a particular place or season.
an instrument for measuring the speed of the wind, or of any current of gas.
in intervals of 3-7 years, this warm countercurrent becomes unusually strong and replaces normally cold offshore waters with warm equatorial waters.
an atmospheric phenomenon that occurs when colder than normal air blows over the Pacific Northwest