*Atmospheric Pressure

*aka air pressure

*Caused by

*Units

*14.7 psi

*Why aren’t we crushed?

*Air pushing out

*Used to it

*Decreases with

altitude/elevation

*Wind – What is it?*Air moves from high

pressure to low pressure

*Wind

*Larger pressure differences = stronger winds

*Named for direction

*Wind chill

*What temp. feels like to us

*Humans only

*Cause

*Related to dangerousness of wind and cold temp.

*Frostbite

*Hypothermia

*Local Wind

*Land warms/cools faster

*Hot air rises

*Lower pressure over land

*Breeze from ocean (high to low pressure)

*Cools the land

*Opposite at night

*Chinook Winds*What?

*Warm winter winds

*Dramatic temperature changes

*Where?

*Mountains

*Moist air

*How?

*Clouds formed*Heat released

*Warmer air than without clouds

*Red belt

*Changing Weather -

Air Masses*Similar temp. and humidity

*Air that has stayed in a place

*Quickly change because they move

*Named for where they form

*Maritime vs. Continental

*Tropical vs. Polar

*Daily Review #3

3. What is wind chill and why is it important to humans?

4. What creates wind?

5. How are Chinook winds created?

6. How can the wind be a benefit to you when you live on the ocean shoreline?

7. A maritime tropical air mass exists over Colorado today, what would the air be like?

*Fronts*Air masses don’t mix

*Front = boundary between them

*What happens?

*Warm, less dense air moves up

*Cold, more dense air sinks

*Types

*Cold

*Warm

*Stationary

*Occluded

*Type of cloud can tell you what type of front

*Tornadoes*Form in severe thunderstorms

*Wind at different altitudes is different speeds

*Creates swirling winds

*Eventually become vertical

*Swirling cloud reaches ground = tornado

*Not on ground for long

*Extremely low pressure

*Winds 100-400 mph

*Not well understood

*Daily Review #4

8.Describe how warm, cold, stationary and occluded fronts are different.

9.Explain how a tornado is formed.

10. Where would you probably not find tornadoes and why?

*Global Wind*Unequal heating at different

latitudes

*Equator (lower latitudes)

*Warmer air

*Rises, lower pressure

*Moves towards poles

* Sinks when cools, higher pressure

*Convection cells

* Patterns of moving air and high/low pressure

*Create areas of high and low winds

* Jet stream

*High speed wind

*Upper troposphere, lower stratosphere

*No consistent path

* Effect weather patterns

*Coriolis Effect*Wind moves in a straight line

*Earth’s rotation

*Causes appearance of curving

*Northern Hemisphere = clockwise (right)

*Southern Hemisphere = counter-clockwise (left)

*Cyclones*Large weather systems* Impacted by Coriolis

effect

*Cyclone

*Low pressure

*Pulls air in and upward

*Produces storms

*Anti-cyclone

*High pressure

*Air moves out and downward

*Clear skies

*Hurricanes*Winds at least 74 mph

*Form over tropics

*Warm, moist air forms clouds

*Rotating

*More water evaporates

*Creates low pressure “eye”

*Lacks wind

*Gets larger with more evaporation

*Loses energy once it hits land

*No more “fuel”

*Cyclones, typhoons, hurricanes