47 terms

Science Chapter 3 Weather Patterns

A huge body of air that has similar temperature, humidity, and air pressure at any given height.
Air Mass
Name the 4 major types of air masses in North America
Maritime tropical, Maritime polar,
Continental tropical, Continental polar
In the U.S. how do air masses commonly move?
Prevailing Westerlies and Jet Streams
The boundary where air masses meet.
Name the four types of fronts.
Cold fronts, Warm fronts, Stationary fronts and Occluded fronts
A swirling center of low air pressure.
High-pressure centers of dry air.
A violent disturbance in the atmosphere.
A small storm that form in large cumulonimbus clouds often accompanied by heavy precipitation and frequent thunder and lightning.
A sudden spark, or electrical discharge that jump between clouds or clouds and the ground.
A sudden violent flood that occurs shortly after a storm.
Flash flood
A rapidly whirling funnel-shaped cloud that reaches down from a storm cloud to touch Earth's surface.
What is the safest place to be during a tornado?
Storm shelter or basement
A tropical cyclone that has winds of 119 kilometers per hour or higher.
Where do hurricanes form?
Over warm ocean water as a low pressure system or tropical disturbance.
A dome of water that sweeps across the coast where the hurricane lands.
Storm Surge
To move away temporarily.
How does precipitation fall when air is colder than zero all the way to the ground.
When cold, dry air mass from Canda moves across the Great Lakes and picks up water vapor and heat from the lakes it is called.
Lake Effect Snow
What do you do if caught in a snowstorm?
Find shelter from the wind and make sure body parts are covered and dry.
tornado watch
announcement that tornadoes are possible
tornado warning
announcement a tornado has been seen
water spout
if a tornado forms over water called a waterspout, only last about 15 minutes but reach 500 km/hr
a hurricane in the pacific ocean is called a typohone
a scientist who studies the causes of weather and try to predict it, they use maps, charts and computers to analyze data
cumulus clouds
usually form on warm afternoons
cirus clouds
if you see them a warm front may be approaching
weather balloon
a balloon which carries instruments high into the troposphere and lower stratosphere
weather satellites
first one Tiros-lin 1960 gather data on temp, humidity, solar radiation and wind speed and direction
automated weather stations
surface location. national weather service has established 1700 observation sites
computer forecasts
gather information from various weather stations, used for 12, 24, 36 hour weather reports
are lines joining places on the map that have the same pressure
lines joining places that have the same temperature
what color represents a warm front?
what color represents a cold front?
what color represents a stationary front
what color represents an occluded front
warm front
a warm air mass over takes a cold air mass
cold front
cold air comes to warm air
stationary front
cold and warm air masses meet neither of them move
ocluded front
warm air mass is caught between two cooler air masses
Coriollis effect
winds in northern hemisphere are switched in the southern hemisphere due to this effect
what are problems thunderstorms can create?
They can cause forest fires and floods
who is dr. T. Theodore Fujita?
He devised the Fujita scale f-0 to f-5, depending on the amount of damage it causes during a tornado,luckily only 1percent of tornadoes are f-4 or f-5
what are 2 snowiest cities in America
Rochester and Buffalo
what are four types of air masses?
Tropical(warm, low pressure), polar(cold, high pressure), maritime(form over oceans, humid), continental(forms over land, dry)
tornado alley
where tornadoes most often occur in the USA, warm humid air mass moves from gulf of mexico, cold dry air mass moves down from canada, usually in spring, early summer