Download equal air pressure.

Developing a Weather Map
Where are the high and low
pressure points?
Next let's add isobars - lines that
connect areas of equal air pressure.
Where are cities with air pressure of 1024?
Which cities are above and below 1024?
Draw the 1024 isobar.
Which cities have air pressure of 1020?
Which cities have air pressure of 1020?
Which cities are higher or lower than 1020?
Draw the 1020 isobar.
Next, we'll draw an 1008 isobar around the low.
Cities lower than 1008 are inside the line.
Next we'll draw a 1012 isobar.
Talk to students at your table.
Which cities are going to be on the line?
Which cities are inside the line ?
Which cities are outside the line?
Your turn. Draw the 1012 isobar.
Here is the 1012 isobar.
Where will we draw the 1016 isobar?
Your turn. Draw the 1016 isobar.
Here is the 1016 isobar.
What do these areas of high and low pressure mean?
High pressure:
1. Cold air sinking and moving away from the center.
2. Air is not rising, storm clouds do not form.
3. Fair weather.
4. Air moves out in a clockwise direction.
5. This is called an "Anticyclone".
Low pressure:
1. Warm air moving toward the center and rising.
2. Moist air is rising, storm clouds form.
3. Cloudy, stormy weather.
4. Air moves in a counterclockwise direction.
5. This is called an "Cyclone".
Fronts always
start at a point of
low pressure.
Here's how to identify a cold front:
1. Winds change direction.
2. Temperatures are warm in front of
the front and cold behind the front.
What are the temperatures? Look at the winds.
Lower temps
Higher temps
The triangles point in the direction the front is moving.
Warm front:
1. Winds change direction.
2. Temperatures are colder in front
of the front, warmer behind.
What are the temperatures of these cities?
Cooler temps
Warmer temps
Here is the completed map, including
precipitation.