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

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 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

AS200 Chapter 2 Lesson 2

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