Help
Options
Didn't know it?
click below
click below
Knew it?
click below
click below
Don't Know
Remaining cards (0)
Know
retry
shuffle
restart
0:00
Embed Code - If you would like this activity on your web page, copy the script below and paste it into your web page.
Normal Size Small Size show me how
Normal Size Small Size show me how
CM Earth Science 6-3
Unit 6 Mr. Wilbur/Barbis: Chapter 24--RB 8
| Question | Answer |
|---|---|
| Unequal heating of Earth’s surface | Causes differences in air pressure |
| Air mass | Large body of air where temperature and moisture content are similar |
| Most solar energy is where? | At equator instead of at poles |
| Air moves? | High to low pressure; Cold air near pole sinks; creates high pressure centers |
| Wind created? | From differences in air pressure at different locations |
| Characteristic of air mass | A stationary or slow moving mass takes on temperature and humidity of that region |
| 4 main types of air masses affecting North American weather | Polar (P)--cold; Tropical (T)--warm; Continental (C)—forms over land; Maritime (M)—forms over water |
| 4 air mass combinations | cP (cold/dry); mP (cold/moist); cT (warm/dry); mT (warm/moist) |
| 6 weather combinations | mP (maritime Pacific); mT (maritime tropical); cP (Canadian Pacific); CT (continental tropical); mP (maritime Atlantic); mT (maritime tropical) |
| Front | Leading edge of an air mass or where two air masses meet; changes in middle altitude—weather here; do not exist in tropics because there are no air masses that have significant temperature differences |
| Cold fronts | Front edge of cold air mass pushes beneath warm air mass like wedge;Large cumulus/cumlionimbus clouds form along cold front;heavy thunderstorms (squall) occur ahead of fast moving cold front;Slow moving cold front produces-weaker storms/lighter precip. |
| Squall lines | Long line of heavy thunderstorms |
| Warm fronts | Front edge of advancing warm air mass replaces colder air with warmer air;gradual slope;due to gentle slope, clouds may extend far ahead of surface location or base of front;Generally produces precipitation over large areas, may be violent weather |
| Stationary front | Air masses that move either very slowly or not at all |
| Occluded front | Cold air mass over takes warm air mass & lifts warm air mass off ground & over another air mass |
| Polar front | Boundary where cold polar air meets tropical air mass of middle latitudes, especially over ocean |
| Midlatitude cyclone | Beginnings of low-pressure storm centers (wave cyclones) |
| Midlatitude cyclone forms: | Rising air moves toward a central low-pressure region; begins to turn CLOCKWISE; cyclone strongly influences weather patterns in middle latitudes |
| Anticyclones | Air sinks and flows outward from center of high pressure region; clockwise in Northern Hemisphere |
| Anticyclone forms: | Air sinks & flows outward from center of high pressure; begins to turn COUNTER CLOCKWISE; brings dry weather because the sinking air does not promote cloud formation |
| Thunderstorms | A usually brief, heavy storm that consists of rain, strong winds, lightning and thunder |
| Lightning | Discharged electricity from clouds; released energy heats air & it rapidly expands, producing loud noise (thunder) |
| Hurricanes | Severe storm that develops over tropical oceans; strong winds over 120 km/hr; spiral in toward low-pressure storm center |
| Tornado | Relatively small destructive rotating column of air that has very high wind speeds & that may be visible as a funnel-shaped cloud; short lived |
| Tornado forms: | When thunderstorm meets high-altitude horizontal winds |
| 5 measurements weather forecasts based on | Thermometer--(air temperature; C. F. K); Wind speed—anemometer; Air pressure—barometer; Wind direction—wind vane |
| Anemometer | Measures wind speed |
| Barometer | Measures air pressure |
| Wind vane | Measures wind direction |
| Upper-atmospheric measurement devices | Radiosonde; Radar; Weather satellites; Computers |
| Radiosonde | package of instruments carried aloft by balloons to measure upper atmospheric conditions; temperature, dew point and wind velocity |
| Radar | Radio Detection and ranging; system that uses reflected radio waves to determine velocity & location of objects |
| Doppler radar | Indicates precise location, movement, & extent of storm |
| Weather satellites | Instruments carried by satellites provide images for weather forecasting |
| Computers | Can store weather data from around world |
| Station model | A pattern of meteorological symbols that represents the weather at a particular observing station & recorded on weather map |
| Isotherms | Lines that connect points of equal temperature |
| Isobars | Lines that connect points of equal atmospheric pressure |
| 4 types of forecasts | Nowcasts: mainly use radar; focus on timing precipitation/tracking severe weather; Daily forecasts: 48-hour weather predicting; Extended forecasts: 3-7 days; Medium range forecasts: 8-14 days; Long-range forecasts: monthly/seasonal; |
| Weather Watch | Issued when the conditions are ideal for severe weather |
| Weather Warning | Given when severe weather has been spotted or expected within 24 hours |
Created by:
vbarbis
Popular Earth Science sets