Day 47 Investigation 9 part 2 Air Masses and Weather Maps Slide
2 Arrows and Scale Visualization Exercise 9.1 Slide 3 Resources P.
85 Slide 4 Slide 5 Color and Real vs Diagram Visualization Exercise
9.2 Slide 6 Resources, P. 89 Slide 7 Review Air Masses Air masses:
Large thick bodies of air Uniform in temperature and humidity Have
distinct boundaries Cover large areas of earths surface Reach top
of the troposphere Names for the source region Slide 8 Colliding
Air Masses Air masses dont stay in one place Warm air masses from
the tropics move north and east Cold air masses from the polar
regions move south and east Slide 9 Colliding Air Masses Air masses
dont stay in one place Movement of air masses creates opportunity
for air masses of different temperatures and humidity to collide
Slide 10 Meeting of Air Masses Remember the density bottles What is
going on inside of the bottle? Denser liquid below the less-dense
one Slide 11 Meeting of Air Masses Imagine I reach north Grab a cP
(continental polar) air mass Shrink it Jam it into the bottle cP
Slide 12 Meeting of Air Masses Imagine I reach south Grab a mT
(maritime tropical) air mass Shrink it Jam it into the bottle with
the cP one What happens to the air masses? Polar air sinks because
it is denser Tropical Air lifts to the top because it is less dense
mT cP Slide 13 Air Mass Model Gases and liquids have fluid movement
The liquid in the bottle represents what would happen in real life
with air masses Slide 14 Fronts If air masses meet, a boundary
forms Front A boundary between two air masses Slide 15 Origin of
Fronts Originated after World War 1 Norwegian meteorologists The
zone where 2 opposing armies clash is called a battlefront The
boundary - violent weather changes often occur Slide 16 Naming
Fronts Takes the name of the air mass that is moving faster and
overtakes a slower air mass Slide 17 Cold Fronts A boundary that
forms when a cold air mass overtakes warm air mass Clouds form
Cold, dense air plows under warm, less dense air Warm, humid air
rises and cools Slide 18 Weather and Cold Fronts Effects from cold
fronts happen quickly Clouds form, can grow into thunderstorms Rain
or snow can fall Lightening and hail Drop in temperature Pressure
increases Cold front symbol on weather map A cold front moves in
Slide 19 Warm Front The boundary that forms when a warm air mass
overtakes a cold air mass Warm air slides up over cold air at a
gentle slope Can be hundreds of km long Slide 20 Weather and Warm
Front Effects happen over long period of time Air pressure
decreases Temperature rises at the surface Clouds thicken and lower
(first wispy, cirrus clouds) then others (cumulostratus,
altostratus, nimobostratus, stratus, possibly fog) Rain, snow,
sleet or freezing rain begin to fall Warm front symbol on weather
map A warm front moves in Slide 21 Surface Observations
Meteorologists receive weather observations from stations all over
the United States and the world These are called surface
observations Slide 22 Surface Observations Surface Observations
include: Temperature Humidity Air Pressure Wind Speed and Direction
Cloud Cover and Type Precipitation Type and Amount Slide 23 Look at
Weather Symbols Use special codes or symbols to represent weather
data on a map Typical weather symbol Slide 24 Weather Symbol Short
barb = 5 knots Long barb = 10 knots From which it is blowing Slide
25 Surface Observations Programmed into a computer that plots the
information on a map Used by meteorologist to make weather
predictions Slide 26 Practice Reading Weather Maps Open to page 57
of your lab book and see if you can read a weather map.
