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Formulate your own forecast

  • Pressure systems

    High-pressure systems generally bring fair weather, while low systems foretell poor conditions. The following procedure is a fairly accurate yet simple method of knowing which pressure system is coming your way. 

    (Click on the image at left for a larger view.)

  • Finding highs and lows

    First, stand with your back to the wind. Then turn roughly 45˚ to your right. Generally, high-pressure systems will be located on your right hand with low pressure developing to your left. Since both highs and lows generally move toward the east, any system coming from the west will likely come over you. 

    (Click on the image at left for a larger view.)

  • Weather forecast chart

    To use this weather forecast chart you will need to obtain a barometer reading corrected to sea level, determine the action of the barometer (rising, falling, steady), and gauge the average wind direction (the chart is set for an average wind velocity of 10 miles per hour). 

    (Click on the image at left for a larger view.)

  • Air mass chart

    For example, take a barometer reading that measures between 30.20 to 29.80. If that reading is rising and the wind is coming from the northwest, you can assume that it will be fair weather for the next 48 hours with temperatures dropping. Higher wind speeds and rapidly rising or falling barometer readings often indicate an immediate change in weather. 

    (Click on the image at left for a larger view.)

  • Cloud observations

    Fine-tune this prediction with observations of cloud activity and official forecasts to obtain an even more accurate picture of weather over your vicinity. 

    (Click on the image at left for a larger view.)

Here are some tips for formulating your own forecast, sponsored by Honda.

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