A cold air mass meets a warm air mass the two masses remain separated often brings many days of cloudy wet weather
Stationary front
100
clouds that cover large areas of the sky and block out the sun
Stratus
100
what are the four types of precipitation
Rain snow sleet hail
100
instrument used to measure the temperature
Thermometer
200
The sound caused by the rapid expansion of air along and electrical strike
thunder
200
a cone shaped cloth bag open at both ends that shows wind direction
Windsock
200
true or false in a lightning storm you should climb a tree
false
200
The temperature at which a gas condenses into a liquid
Dewpoint
200
The continuous movement of water from sources and roots surface such as lakes, oceans, and plants – into the air, onto and Over land, into the ground, and back to the surface
water cycle
300
Instrument used to measure atmospheric pressure
Barometer
300
an electric discharge the takes place between two oppositely charged surfaces
Lightning
300
An instrument used to measure wind speed
Anemometer
300
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
relative humidity
300
A special thermometer for determining the relative humidity
Wet-bulb dry-bulb thermometer
400
The change of state from a gas to a liquid
Condensation
400
thin feathery white clouds found at high altitudes
Cirrus
400
Cold air moves under warm air, which is less dense, and pushes the warm air up. Move quickly and bring thunderstorms, heavy rain, or snow
Cold front
400
The boundary between air masses of different densities and usually different temperatures
Front
400
warm air moves over a cold, denser air. The warm air gradually replaces the cold air. Brings drizzly rain and is followed by clear and warm weather.
Warm front
500
forms over the polar regions; cold
Polar
500
puffy white clouds with flat bottoms
Cumulus
500
air mass forms over water; wet
Maritime
500
Weather alert that lets people know that a tornado has been spotted
Warning
500
an area in the atmosphere that has lower pressure them the surrounding areas and has winds that spiral toward the center. They bring stormy weather