atmospheric pressure
DESCRIPTION
aka air pressure Caused by Units 14.7 psi Why aren’t we crushed? Air pushing out Used to it Decreases with a ltitude/elevation. Atmospheric Pressure. Air moves from high pressure to low pressure Wind Larger pressure differences = stronger winds Named for direction Wind chill - PowerPoint PPT PresentationTRANSCRIPT
*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