AS200 Chapter 2 Lesson 2

What areas make the ideal source regions?
Mountainous areas where the temperature remains cold for long periods
Oceans and lakes with rapid temperature changes
Flat, uniform areas where the temperature and moisture don't change rapidly
Forested areas where the vegetation creates additional humidity
Which is NOT a category of air mass?
CA
CT
MA
MP
What outside factors shape air masses?
The level of air pollution and the season
Dew point and barmetric pressure
Source region, the qualities of the surface over which air masses travel, and season
Solar variation, strong winds, and surface quality along with land temperatre
What happens when an air mass passing over a warmer surface is warmed from below?
It produces updrafts
It produces a downdraft
It creates a tornado
It creates high winds
What can summer temperatures do to an otherwise cold, dry (cP) air mass traveling south from a northern region?
They can cause a reaction among water vapors that results in a hailstorm
They can warm and inject moisture into an otherwise cold, dry air mass
They can bring about a sudden and early change in seasons
They can produce a front that pushes the air mass back north
What type of circulation takes place in the northern hemisphere when the flow of air from areas of high to low pressure swerves to the right to produce a clockwise circulation around a high pressure area?
Anticyclonic
Coriolis force
Cyclonic
Tornado
Why do low pressure systems often bring in bad weather with increasing cloudiness and precipitation?
Air flowing into a low pressure system to replace rising air tends to be unstable
Low pressure systems trap moisture and clouds under an atmospheric ceiling
The drier air is more dense and volatile
The clouds brought in by low pressure systems create precipitation
What are two factors that can change wind direction and speed close to earth's surface>
Air currents and anticyclonic circulation
Local conditions and land features
Air masses and fronts
Air mass modification and water sublimation
What happens when high and low pressure systems meet in fronts?
The temperature drops
The high pressure system absorbs the low pressure system
They produce hazardous flying conditions
Their winds move in opposite directions where they make contact
What type of front produces the most dramatic wind shift?
Cold
Low
Warm
Moist
What clouds are you likely to see after the passage of a warm front?
Cirrus
Cirrocumulus
Cumulonimbus
Stratocumulus
What direction do cold fronts normally take in the northern hemisphere?
Northeast to southwest
East
Southwest to northeast
West
A meteorologist observes stratocumulus clouds commanding the sky with rain showers possible. Visibility improves but conditions seem to be remaining hazy. The wind is blowing from the south-southwest. As the temperature climbs, the dew point also rises and then levels off. Finally, the barometric pressure rises just slightly only to fall again. What type of front and what stage of that front has the meteorologist just observed?
During passage of a warm front
After passage of a warm front
Before passage of a cold front
During passage of a cold front
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