Cold and Warm Fronts
Define Front
Where 2 air masses meet and do not mix.
What instrument is used to measure temperture?
What is Thermometer?
The percentage of water vapor actually in the air versus the amount of water vapor the air can hold at the temperture.
What is Relative Humidity.
What moves air masses?In what direction do they usally move.
Prevailing westerlies push the air masses from west to east.
Define Occuluded front?
A warm air mass trapped between 2 cold air masses, the warm air is pushed up as the 2 cood air masses join together, cutting off the warm air from the surface.
A QUICK moving air mass moving under an warm air mass, causes stormy weather
A cold front
What is Weather?
The condition of Earth's atmosphere at a particular time and place?
Psychrometer
Instrument used to measure relative humidity.
How are sleet and freezing rain different?
Sleet falls as is falls through a layer of cold air;freezing rain freezes on a cold surface
A warm and cold air mass meet, but neither is strong enough to move the other; just stays there,not moving or moving very slowly.
A stationary front.
How does the speed of a cold front compare to the speed of a warm front.
Cold fronts more quickly;warm fronts move slowly
The envolope of gases that surround our planet.
What is Atmosphere?
Define dew point.
What happens at dew point?
The temperture at which wate vapor turns into condensation.
saturation occurs and dew forms.
Where does water vapor come from?
evaporation from bodies of water.
1. describe an occuluded front weather symbol.
2. describe an stationary front weather symbol.
1.rounded half circles and triangles that are purple.
2. rounded half circles and triangles that are on opposite sides that are blue and red
Describe the weather symbol for a Warm Front.
Round half circles that are red.
What weather is associated with cumulonimbus clouds.
Thunderstorms and tornadoes.
What are the 4 common air masses based on?
Humidity and temperture
What causes convection to take place?
Changing tempertire cause convection corrents to take place. Less dense,warm air rising... cool,more dense air sinking;continuous circulation. Cold air is more dense than warm air
Sharp red triangles and round blue half circles, on different sides.,
Weather symbol for a stationary front
1. Weather associated with a Cold front
2. Weather associated with a Warm Front
1.Strong Thuynderstorms and colder temps
2. Cloudy skies,showers,light rain,warmer temps,higher humidity.
What are some differnces between a cyclone and an anticyclone? ( think wind and types of weather)
Their winds spin in different directions.
cyclone-low pressure and cludy/rainy weather
anitcyclone-high pressure and clear, dry weather.
How is saturated air different than air that is not saturated?
Saturated air has a greater amount of water vapor in it than air that is not saturated.
What is the process for hail formation?
In a cumulonimbus cloud, strong winds pick up rain drops and push them up high, they freeze, fall and
get covered in rain, wind picks them up and pushes them high again, freezes again, cycle keeps
repeating until the wind isn’t strong enough to push the hail up.
1. Many days of rain.
2.Severe, strong storms
1. Stationary Front
2. Occuluded Front