Chapter 20 Earth Science
Terms in this set (49)
immense body of air, consistent pressures and humidities
(P) air masses that form at high latitudes
(T) air masses that form at low altitudes
(m) air masses that form over water
(c) air masses that form over land
(A) air masses that form over the arctic
weather in north america
influenced by (cP) and (mT)
uniformly cold and dry in winter and summer. Not associated with precipitation. Brings lake-effect snows.
Caused by a cold mass traveling over a relatively warm lake.
dominant role in north american weather. warm moist unstable. heavy precipitation.
come from north pacific. form from cold dry continental polar air masses. Humid. Accompanied by low clouds and showers
is when a mP is formed in New England area by counter clockwise winds (snow)
hot and dry. Least influent on american weather. Warm and mild.
when warm air moves into cold air. red line with red semicircles that point in direction of cool air. cirrus clouds warn of a warm front - change into cirrostratus than nimbostratus. light precip for a long time.
cold air moves into warm air. blue line with blue triangles going into warm. steep. heavy down pores and gusty winds. temps drop when passed. low cumulus and stratocumulus clouds. THUNDERSTORMS
when position of front doesn't move. stratoform cloud. blue tris on one side, red semis on other. gentle precipitation.
when cold overtakes a warm and wedges the warm upward. Complex weather patterns. most precipitation when the warm air is pushed upward. sometimes the newly formed fronts cause light precipitation.
large centers of low pressure that generally travel from west to east and cause stormy weather. COUNTERCLOCKWISE direction and toward center of low. Abundant precipitation. Forms from stationary. Cold air moves toward equator while warm moves to poles.
when cold front lifts the warm front.
are the fuels to mid latitude cyclones.
a storm that generates lightning and thunder. Frequently produce gusty winds, heavy rain, and hail.
(T/F) Thunderstorms produce 2000 on earth at any give given time. Greatest number in tropics. Associated with cumulonimbus.
Development of thunderstorms
form when warm humid air rises in an unstable environment.
stage of thunderstorm when strong updrafts supply moist air.each new surge of warm air rises high than the last and causes clouds to grow vertically.
stage of thunderstorm is when heavy precipitation occurs because amount is too great for updrafts to support. Most active stage of storm. Gusty winds, lightning, heavy precipitation, hail.
is when downward movements of air dominate the clouds. Cooling effect of the falling precipitation and the flowing in of colder air from high above cause the storm to die down.
are violent windstorms that take the form of a rotating column of air. US has most (Kansas, North Georgia, Alabama, Tennessee)
a rotating column of air that extends downward from a cumulonimbus cloud all the way to the ground.
a tornado that forms over water
Occurrence of tornadoes
770 a year. April through June is greatest
is a vertical cylinder of rotating air that develops in the updraft of a thunderstorm.
Formation of Tornadoes
when strong winds high up in atmosphere cause winds lower in the atmosphere to roll.
480 km winds. Low pressure from tornado causes all air near the ground to rush into a tornado from all directions. couple minutes long
Enhanced Fujita Tornado intensity scale
scaled used to measure tornado intensity.
condition in atmosphere when wind at different altitudes blowing in different speeds or different directions.
Storm Prediction Center
monitors different kinds of sever weather. Missions is to provide timely and accurate forecast and watches for thunderstorms and tornadoes. Tornado warning initiated after actual sighting.
nickname for central US most tornadoes
whirling tropical cyclones that produce sustained winds of at least 75 mph are known in the US as hurricanes. Most powerful storms on earth. 15 meter waves, strong winds and extensive flooding. Tropical Storms precede hurricanes.
form about 5-20 degrees north and south latitude.
The strongest winds of a hurricane surrounding the eye
Development of hurricanes
need heat and moisture from water. Inward rush of moist surface air moves towards core. Eye wall creates.
the very center of the hurricane. Warmest part of the storm.
Saffir Simpson Scale
Classifies hurricanes according to wind speed, air pressure in the center, and potential for property damage.
A dome of water that sweeps across the coast where a hurricane lands. Rise in sea level.
A sudden spark, or energy discharge, caused when electrical charges jump between parts of a cloud, between nearby clouds, or between a cloud and the ground.
a booming or crashing noise caused by air expanding along the path of a bolt of lightning
Ice pellets larger than 5 millimeters in diameter formed in cumulonimbus clouds by strong updrafts of wind
The most common type of "vertical" wind shear. A downdraft that is generally small, associated with heavy rain showers, and are short-lived.
large, rotating single-cell thunderstorm, can cause tornadoes, large hail, frequent lightning, heavy rain, strong winds
The high level clouds moving clockwise out away from the hurricane.
YOU MIGHT ALSO LIKE...
MCAT Physics | Kaplan Guide
Earth Science Chapter 20
Science Ch 20
Earth Science Meteorology- Pages 4-8
OTHER SETS BY THIS CREATOR
HOS II CFH Vocab
Spanish Irregular Imperatives
Religion Chapter 17 Vocabulary
Biology Chapter 31
THIS SET IS OFTEN IN FOLDERS WITH...
Chapter 20 Earth Science
Topic 8- Water and Climate
Physical/Earth Science Chapter 17
Chapter 18 Earth Science Vocabulary