32 terms



Terms in this set (...)

What keeps unlike air Masses separate
Differences in density
What is the boundary that forms between air masses when they meen is a _______
Define cold front
The front edge of a moving mass of cold air that pushes beneath a warmer air mass like a wedge
Define warm front
The front edge of an advancing warm air mass that replaces colder air with warmer air
Define stationary front
A front of air masses that moves either very slowly or not at all
Define occluded fornt
A front that forms when a cold air mass overtakes a warm air mass and lifts the warm mass off the ground and over another air mass
Describe the type of storms that form along cold fronts
Storms and rain
How does a slow-moving cold front differ from a fast-moving cold front
A fast-moving cold front brings storms and rain a slow-moving cold front brings weaker stoms and weaker rain
When does a warm front form
When warm air takes over a cold front
What kind of weather does a warm front bring
rain and sometimes violent weather
Describe how a stationary front forms
When two air masses meet that are the same speed so they stop when they meet
Compare the weather produced by a stationary front to the weather produced by a warm front
They are similar the same
The boundary where cold polar air meets the tropical air mass of the middle latitudes, especially over the ocean, is called the ________
Midlatitude cyclone
Bends that form in a stationary front or cold front that are the beginnings of low-pressure storm centers are called ________
Polar fronts
Also known as midlatitude cycolnes
Wave cyclones
An area of low pressure that is characterized by rotating wind that moves toward the rising air of the central low-pressure region is called a _______________
Midlatitude cyclone
Unlike the air a midlatitude cyclone the air of an ________ sinks and flows outward from a center of high pressure
summarize the four stages of a midlatitude cyclone
1 occur along side of stationary front
2 a wave forms
3 an occluded front forms
4 loses energy and disappears
describe how midlatitude cyclones travel and move in North America
45 toward east
describe an anticyclone
the air in an anticyclone sinks and flows
what kind of weather does an anticyclone bring
brings dry weather
list five weather events that are considered severe weather
rain lightning hail strong wind and tornados
a usually brief heavy storm that consists of rain strong winds lightning and thunder
electricity that is discharged from a cloud
mature stage
the second stage of a thunderstorm in witch condensation continues as the cloud rises and becomes a dark cumulonimbus cloud perhaps producing torrential rain and hail
dissipating stage
the third stage of a thunderstorm in which strong downdrafts stop air currents from rising and the storm dies out as the supple of water vapor decreases
cumulus stage
the first stage of a thunder stormin which warm moist air risres and water vapor in the air condenses to form a cumulus cloud
an effect created when electricity heats the air and the air expands rapidly
rotating column of air when storms meet high altitude
jet streams
:long distance wind belt
:flows west to east
:separates warmer subtropical air from cooler polar air
polar jet stream
From b/c density differences of cold polar air and warm air
reach speeds of 200mph
affects airplane routes
affects paths of storms
subtropical polar
forms in subtropical regions where warm air meets cold air
little change in speed / direction