Chapter 20

Question 0

What is a huge body of air in the troposphere with similar temperature and humidity throughout?

Answer 0

An air mass

Question 1

Which thing on a station model gives two pieces of info?

Answer 1

Wind gives speed and direction

Question 2

What is an area that an air mass took on the temperature and humidity of?

Answer 2

A source region

Question 3

What can a source region be?

Answer 3

Land or water

Question 4

Are source regions windy places?

Answer 4

NO

Question 5

Continental

Answer 5

Low humidity (land)

Question 6

Maritime

Answer 6

High humidity (oceans)

Question 7

Polar

Answer 7

Cool/cold

Question 8

Tropical

Answer 8

Warm

Question 9

What is formed when two different air masses meet?

Answer 9

A front

Question 10

What is it when the colliding air masses stop moving, or move parallel to the front between them, the front itself doesn’t move over the ground?

Answer 10

A stationary front

Question 11

What forms if a warm air mass overtakes a cold air mass?

Answer 11

Warm front

Question 12

What happens when a cold air mass meets a warm air mass?

Answer 12

A cold front forms

Question 13

What do most interaction between air masses cause?

Answer 13

Precipitation

Question 14

Air is lifted when warm, moist air crosses over a mountain. The mountain forces the air to rise and cool. At the dew point, clouds form and precipitation begins and spills over the other side. What causes this?

Answer 14

Orographic lifting

Question 15

What causes the collision of horizontal air currents?

Answer 15

Convergence

Question 16

What are the four types of severe weather?

Answer 16

Winter storms, thunderstorms, tornadoes, and hurricanes

Question 17

What does hook do?

Answer 17

It indicates the presence of a tornado

Question 18

What is a Nor’easter?

Answer 18

A cyclonic winter storm

Question 19

What is a string of thunderstorms along a cold frontal system called?

Answer 19

A squall line

Question 20

How are thunderheads shaped?

Answer 20

They’re anvil-shaped

Question 21

What is the air called when a large thunderstorm is approaching and the rain is precede by a blast of noticeably cooler air?

Answer 21

A gust front

Question 22

What is thunderstorms greatest hazard?

Answer 22

Lightning

Question 23

What is an electrical discharge either between clouds or between a cloud and the ground?

Answer 23

Lightning

Question 24

What is a narrow, rapidly spinning mass of air extending downward from a cumulonimbus cloud?

Answer 24

A tornado

Question 25

What are massive rotating storms?

Answer 25

Supercells

Question 26

Do tornadoes occur often?

Answer 26

They only occur under unusual circumstances

Question 27

What are tornadoes associated with?

Answer 27

Supercells

Question 28

How can you figure how far away lightning is?

Answer 28

By counting the seconds until you hear thunder and divide that number by 5

Question 29

What are the two great destructive features of a tornado?

Answer 29

The high-speed, rotating wind and the updraft

Question 30

Are tornado's path of destruction usually narrow?

Answer 30

YES

Question 31

What storm has the highest wind speeds?

Answer 31

Tornadoes

Question 32

Are tornadoes high pressured?

Answer 32

NO

Question 33

Does pressure cause damage in a tornado?

Answer 33

NO

Question 34

How high can a tornado's wind speeds be?

Answer 34

As much as 320 mi/h

Question 35

What does the Enhanced Fujita-Pearson scale describe?

Answer 35

The width of the destruction path and the distance the tornado was in contact with the ground

Question 36

Are hurricanes formed by a single cumulonimbus cloud?

Answer 36

NO

Question 37

Where are hurricanes born?

Answer 37

Within 10-15 degrees latitude of the Equator

Question 38

What is a cyclonic storm that's winds reach 39 mi/h or more categorized as?

Answer 38

Tropical storms

Question 39

How does the speed of the i rushing air increase in a hurricane?

Answer 39

As the low pressure in the center drops, the pressure gradient force grows

Question 40

What slows hurricanes down?

Answer 40

Land

Question 41

What are huge waves in hurricanes called?

Answer 41

The storm swell

Question 42

What is the higher than normal water level called?

Answer 42

The storm surge

Question 43

What is the storm surge caused by?

Answer 43

Wind

Question 44

How can you stay safe in a thunderstorm if you're in an open field?

Answer 44

You crouch down and avoid being the tallest thing around

Question 45

What does a staff point to?

Answer 45

The direction from which the wind comes

Question 46

What are lines of equal pressure called?

Answer 46

Isobars

Question 47

What are the four principle weather maps or charts prepared by the National Weather Service called?

Answer 47

Synoptic weather maps