1. Reading a Weather Map
Predicting the Weather

2. Air Pressure
• Generally acceptable
pressure range is 94.00
kPa to 106.00 kPa
• Add a 9 or 10 in front
of the number and
move the decimal two
places to the left
– ie. 9013 = 90.13 or
10013 = 100.13
• Which air pressure is
acceptable?

3. Air Pressure
• Even if you forget how
to do this, you know
that
– “High means Dry” or
– Low pressure is
associated with really
stormy weather
• The circle tells you the
fraction of cloud cover
• You be the judge

4. Air Pressure
• Converting kPa to millibars
– Multiply by 10
– 100.13 kPa = 1001.3 mb

5. Air Pressure Change
• If 013 translates to
100.13 kPa with 2
decimal places…
– +08 becomes “an
increase of 0.08 kPa”
(notice, 2 decimal places)

6. Wind Direction and Speed
• The point towards the
circle in the same
direction as the wind
travels.
– ie. Southwesterly
• Wind speed shown by
total barbs
– Each barb = 10 knots
– ½ barb = 5 knots
– ie. 15 knots

7. Temperature
• Measured in degrees
Celsius
– ie. 25°C

8. Dew Point
• The temperature at
which condensation will
occur.
– In other words, when
clouds will form
• Measured in degrees
Celsius
– ie. 19°C