Transcript Wind

Aim: How are winds created?
Do Now: In your notebooks answer the
following questions.
1)Near which
letter are the
strongest
winds
located?
2)What are the C
lines on this
map called?
A
B
I. Wind
Wind: is the movement of air from high
pressure to low pressure.
H
L
- Wind direction is named based on where
wind comes from.
N
W
E
Wind is blowing from the west
S
-Wind direction is
measured using a wind
vane
-Wind speed is measured
using an anemometer.
-If wind blows from one
direction mostly, it is
called a prevailing wind.
* In the U.S.,
the westerlies
constantly move
weather west
to east.
II. Pressure Systems
- Differences in pressure creates wind.
1. High Pressure System (anticyclone)
Air Temperature:
cooler
Moisture content: dry air
Vertical Movement: sinks at center
Weather conditions: Happy weather (dry/sunny)
Rotation:
A large blue H indicates the center of
high pressure
2. Low Pressure System (Cyclone)
Air Temperature:
warmer
moist air
Moisture content:
Vertical Movement: rises at center
Weather conditions: Lousy weather (wet/cloudy)
Rotation:
a large red L marks the center of low
pressure
What type of pressure system was
most likely in RVC yesterday?
How about today?
High Pressure:
Rotates Clockwise and
Outward from the center.
Low Pressure:
Rotates
Counterclockwise and
inward to the center.
III. The Coriolis Effect
- Curves the path of air and ocean currents
across the Earth.
- Caused by the rotation of the Earth
Northern Hemisphere =
curved to the right
Southern Hemisphere =
curved to the left
Cyclones and
anticyclones move in
the opposite
direction in the
Southern
Hemisphere.
IV. Weather Forecasting
• Weather reports emphasize the locations
and possible paths of cyclones and
anticyclones (High and Low pressure).
* Lowpressure
centers can
produce bad
weather in
any season.
Closure:
• In your notes, list the characteristics
for a low pressure system and a high
pressure system.
H
L
• High Pressure
• Heavy Air (Sinking)
• Happy Weather
• (clear skies)
• Clockwise
• Out
• Low Pressure
• Light Air (Rising)
• Lousy Weather
• (clouds & precip.)
• Counterclockwise
• In