Clouds
High level, streaky clouds made mostly of ice crystals
Cirrus Clouds
A prediction of the weather conditions for a given area and a given time period
Forecast
The pressure exerted by air per unit surface area in the Earth's atmosphere.
Air Pressure/Barometric Pressure
A device used to measure the accurate wind speed in mph or kph.
Anemometer
The boundary between two unlike air masses
Front
The average weather in a place over a long period of time
Climate
Mid-level, puffy clouds
Cumulus Clouds
A weather symbol that represents the state of the weather at a particular place.
Station Model
Describe the pressure and humidity on a sunny/fair weather day.
High pressure/Low humidity
Instruments high in the atmosphere that collect data about temperature, air pressure, and wind speed.
Weather balloons
Fronts usually move in this direction
From west to east
This layer of the atmosphere is where weather occurs
Troposphere
Lower-level, layered looking clouds
Lines drawn on a weather map that connect areas of the same barometric pressure at a given time.
Isobars
Describe the air pressure and humidity on a stormy/rainy day.
Low pressure/High humidity
Where weather data including temperature, humidity, cloud cover, precipitation, air pressure, and wind are collected.
Weather stations
A front moving into an area usually signifies this.
A change in the weather
Rain, snow, sleet, and hail are all examples of this
Precipitation
Why does fog disappear as the day goes on?
The air cools enough overnight for moisture to condense on the ground. During the heat of the day the fog breaks up because warmer air holds more water.
Isotherms
Severe weather usually has what level of air pressure?
Very low pressure
A device used to measure air pressure
A Barometer
The state of the atmosphere at a given time and place
Weather
"April showers bring May flowers" is an example of this
Weather folklore
What do factors are needed for clouds to form?
Condensation and dust
Describe how each of the 4 types of fronts are shown using symbols on a weather map.
Cold Fronts - blue triangles; Warm Fronts - red semicircles; Stationary Fronts - Alternating blue triangles and red semicircles; Occluded Fronts - purple triangles and semicircles
How does air pressure work to make an index card "stick" to a cup of water when turned upside down.
The air pressure forces the card up, but the air can't get through from above to force the card down.
The study of Earth's atmosphere and what happens in it
Meteorology
The amount of water vapor in the air compared with the greatest amount that could be in the air at that temperature and pressure
Relative humidity
The main types of severe weather we might encounter in Virginia are what?
Tornadoes, hurricanes, floods, thunderstorms