1. Weather Station Models Isobars & Isotherms

2. What do Weather Map Symbols look like?

3. What does a weather station tell us?
The sky around the weather observation station including the amount of cloud cover
The present weather conditions including precipitation type and amount.
The visibility (measured in miles)
The air temperature and dew point (both in degrees Fahrenheit
The wind speed and direction
The barometric pressure (measured in millibars) and the pressure trend.

4. Cloud Cover
Cloud cover is represented by a pie graph. The amount of the circle that is dark is used to indicate the portion of the sky covered by clouds. It can be empty (0%), shaded by 25%, 50%, 75% or 100%.

5. Temperature
Temperature, also known as dry bulb temperature, will always be the first number written on the upper left hand side of the model.

6. Dew Point
Dew point is the temperature at which the air would be saturated with water vapor. Although dew point is a temperature it is an indicator of the absolute humidity.

7. Wind Direction
A line connected to the circle indicates wind direction. Remember wind is always named according to the direction it is coming from.

8. Barometric Pressure
Barometric (air) pressure is recorded as a three digit number. It helps to realize that the normal barometric pressure at Earth’s surface is generally 1000 millibars (mb).

9. How to Interpret Barometric (Air) Pressure
Study This!!!!!!
If the three digit code is less than 500 (499 or less) add a 10 at the beginning and a decimal point before the last number.
If the three digit code is greater than 500 (500+) add a 9 before the number and a decimal before the last digit.

10. Practicing Interpreting Barometric Pressure
Decode these coded pressures:
= _______
= _______
= _______
= _______
= _______