30 terms

Weather Forecasting

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front
the boundary between air masses of different densities and usually different temperatures
warm front
warm air moves over cold, denser air and replaces the cold air (drizzly rain followed by clear and warm weather)
cold front
cold air moves under warm air, which is less dense, and pushes the warm air up (cooler weather follows)
stationary front
when a cold air mass meets a warm air mass however both air masses do not have enough force to lift the warm air mass over the cold air mass (many days of cloudy wet weather)
occluded front
warm air mass is caught between two cold air masses (cool temperatures and large amounts of rain and snow)
station model
a small circle that shows the location of a weather station
isobars
lines on a weather map that connect points of equal air pressure
cyclone
areas that have lower pressure than the surrounding areas; winds spiral toward the center (moves counterclockwise)
anticyclone
areas that have high pressure winds spriral away from the center (moves clockwise)
anemometer
instrument used to measure wind speed
barometer
instrument used to measure air pressure
psychrometer
instrument used to measure relative humidity
thermometer
instrument used to measure temperature
weather vane
instrument used to measure wind direction
air mass
a large body of air where temperature and moisture content are similar throughout
relative humidity
the amount of water vapor in the air compared with the maximum amount of water vapor that the air can hold at a certain temperature
cumulus clouds
puffy, white clouds that tend to have flat bottoms (form when warm air rises)
stratus clouds
clouds that form in layers (cover large areas of the sky and often block our the sun)
cirrus clouds
thin, feathery, white clouds found at high altitudes (form when the wind is strong)
cumulonimbus clouds
thunderstorms come from this kind of cloud
nimbostratus clouds
dark stratus clouds that usually produce light to heavy, continuous rain
fog
stratus cloud that forms near the ground
precipitation
rain, snow, sleet, or hail
maritime polar
moist and cold air mass
maritime tropical
moist and warm air mass
continental tropical
dry and warm air mass
continental polar
dry and cold air mass
thunderstorms
storms that form in large cumulonimbus clouds
balloons and satellites
these instruments have improved our weather forecasting abilities
Wind Names
are given from the direction in which the wind is coming from