Pressure
http://www.youtube.com/watch?v=LYeQLA1eI0s
Complete the chart with characteristics of High Pressure
Low moisture
Good weather
Air sinks-diverges
anticyclone
Outward winds
Cool temps
Clockwise
High density
Draw what a high pressure system would look like in the Northern Hemisphere.
Complete the chart with characteristics of Low Pressure
Bad weather
High moisture
cyclone
Air rises- converges
Inward winds
Warm temps
counterclockwise
Low Temps
Draw what a low pressure system would look like in the Northern Hemisphere.
Is the relationship between temperature and pressure direct or indirect? Explain.
Indirect. As temperature increases the pressure decreases because air rises. When temperature decreases the pressure
increases because the
Fronts
http://www.youtube.com/watch?v=dBNIVzb0sds
The video begins with a refresher on clouds and how air can rise.
What are the four main types of air masses that will affect our weather in the continental US?
mT, mP, cP/cA, cT
What is the definition of a front?
Boundary between two air masses
List characteristics and draw the map symbol for a cold front.
Boundary between cP and mT air masses
Heavy precipitation, possible thunderstorms and tornadoes
Fast moving
Precipitation happens directly at the boundary
After the front passes there is higher pressure, with cooler temperatures and clear skies
Pause at 5:00 and draw a picture of what a cold front would look like as it moves across the surface.
List characteristics and draw the map symbol for a warm front.
Boundary between mT and cP
Gradual precipitation
Moves more slowly
It rains before the boundary.
Clouds gradually get lower in the sky
After the front passes there are warm temperatures with lower pressure and humid air
Pause at 5:55 and draw a picture of what a warm front would look like as it moves across the surface.
List characteristics and draw the map symbol for an occluded front.
Cold front catches up to a warm front.
Brings significant precipitation
A “coma cloud”
Pause at 7:00 and draw the picture on the right of the occluded front forming.
List characteristics and draw the map symbol for a stationary front.
Two fronts collide.
Neither is able to make progress.
Front stalls
Little precip.
Pause at 8:10 and draw the cross section view of the stationary front