Describing Weather
Barometric Pressure
Air Masses
Weather Fronts
Isotherm/Isobar Maps
100
25) What is barometric pressure?
25) (C) The weight of the atmosphere over a location
100
30) What kind of pressure system is created where warm air rises?
30) (D) a low pressure system
100
32) What type of air mass forms over land?
32) (A) a continental air mass
100
37) What is a weather front?
37) (C) A boundary between different air masses
100
42) What does an isotherm map show?
42) (A) The temperature of a region
200
26) Which term is used to describe the amount of water vapor in the air?
Temperature Humidity
Precipitation Barometric pressure
26) (B) Humidity
200
31) What creates a high pressure system?
31) (B) cool air sinking
200
33) What type of air mass is associated with warm, moist and unstable air?
33) (D) Maritime Tropical
200
38) label the four types of weather fronts
38) A) Cold Front B) Warm Front
C) Occluded Front D) Stationary Front
200
43) Locations along an isotherm line on an isotherm map have the same what?
43) (A) the same temperature
300
27) Complete the statement.
____________ can make it feel cooler than it is and ____________ can make it feel warmer than it is.
a) wind, humidity b) humidity, precipitation
c) precipitation, wind d) humidity, wind
27) (A) wind, humidity
300
54) How does barometric pressure change with altitude? Why?
54) Barometric pressure decreases with altitude. It decreases because there is less air "weighing down" at higher altitudes.
300
34) What type of air mass would form over the Canada?
34) (A) Continental Polar
300
39) What type of front is non-moving?
39) (C) Stationary Front
300
44) What does an isobar map show?
44) (C) The barometric pressure of a region
400
28) What do we call the temperature at which water condenses out of the air and forms water droplets?
28) (C) Dew Point
400
55) Compare the weather conditions associated with a high pressure system to the weather conditions associated with a low pressure system.
55) High Pressure: fair weather, clear/sunny skies, cool and dry air, light winds.
Low Pressure: warm, humid air, cloudy conditions, stormy weather, strong winds
400
35) What type air mass brings cool, moist and unstable air to the Northwest United States?
35) (C) Maritime Polar
400
57) Compare the weather along a warm front to the weather along a cold front.
57) Warm Front: cloudy weather, light precipitation, warmer and more humid air.
Cold Front: usually heavy precipitation in the form of rain or snow, cooler, drier air
400
58) What do close isotherm or isobar lines tell you about wind speed and/or direction?
58) The closer the isotherm or isobar lines, the faster the wind speed. Wind blows from high pressure to low pressure or cold regions to warm regions.
500
29) What does UV index measure?
29) (C) The intensity of the sun's ultraviolet light
500
41) What type of air masses usually collide to create weather disturbances in the United States?
41) (C) Warm and moist (mT) with cool and dry (cP)
500
36) What do we call a strong current of air that moves between polar and tropical air masses?
36) (C) Jet stream
500
40) In general, how does weather move across the United States?
40) (D) from west to east
500
64) How would you drawn an isotherm map of the US given the temperatures of the following locations? Draw it on you paper.
64)
