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Transcript 
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Today
No HW, STUDY!
Severe Weather
Cloud in: a bottle
demo
Hurricane video
Lab # 8: Weather
Review?
Next week
TEST DAY
Cloud in a bottle Demo
• http://www.youtube.com/watch?v=msSVQ
903T8k
Front
Cold air mass
Cold front
Warm front
Air adibatically cools,
forms clouds
Warm air rises
because it’s less
dense than cold air
Cold front: a place where a cold air mass
replaces a warm air mass
How does the
temperature change
in front of and behind
a cold front?
How do weather
conditions change in
front of and behind a
cold front?
Warm air overrides cool air
because it’s less dense; air cools
and forms clouds
Warm air moves in
Warm front: a place where a warm air mass replaces
a cold air mass
How does the
temperature change in
front of and behind a
warm front?
How do weather
conditions change in
front of and behind a
warm front?
The white numbers represent air temperature (degrees
C). Which line best represents a COLD FRONT?
1. A
2. B
A
B
This is how a low pressure system forms:
1) An advancing cold front (dense air) displaces
warm air
2) Warm air rises, causing a region of low pressure
to form
Low pressure system usually has
a warm and cold front
As the low pressure intensifies,
the cold front overtakes the warm
front (or vice versa).
Where they meet is an
occluded front.
Weather changes with the passage of fronts….
Some fronts are accompanied by a rapid or violent
change in the weather called storms.
•Thunderstorms
•Tornadoes
•Hurricanes
http://www.spc.noaa.gov/
Thunderstorms develop
in warm, moist air that
is quickly uplifted
This air is uplifted by:
1) Differential heating
2) Mountains
3) Passage of cold front
• The electrical energy flowing from cloud to ground is
lightning.
• As lightning heats up the air, the air expands and we hear
thunder.
Tornadoes
•Violent, local
windstorms
associated with
severe thunderstorms
•Rotating column of
air extending
downward from a
cumulonimbus cloud
“Tornado Alley”:
Spring, early summer, warm, moist air from Gulf of Mexico
collides with dry cold air from Rocky Mountains
The greatest storms on Earth are
hurricanes. (This is hurricane Ivan)
Hurricanes are tropical cyclones with
winds greater than 120 km/h (75 mph)
Hurricanes occur in tropical oceans all over the world and go by
these names:
Pacific Ocean: Typhoons
Indian Ocean: Cyclones
Atlantic Ocean: Hurricanes
Around Australia: Willy Willy
EYE =
RELATIVE
CALM
EYEWALL =
HIGHEST WINDS,
MOST RAIN
Hurricanes develop in
late summer when sea
surface temperatures
are warm
Tropical Storm
Katrina, 24 Aug
2005
Hurricane
Katrina
(category 1)
25 Aug 2005
Hurricane Katrina
(category 3)
26 Aug 2005
Hurricane Katrina
(category 5)
Sustained winds of 160
mph
27 Aug 2005
Hurricane Katrina
(category 4)
28 Aug 2005
Most devastating damage: the storm surge
http://www.amazon.com/Hurricane/dp/
B007NZVJ96/ref=sr_1_1?s=instantvideo&ie=UTF8&qid=1369010605&sr=
1-1&keywords=hurricanes
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