Reading a weather map slideshare
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This document provides instructions for reading a weather map and understanding key elements such as air pressure, wind direction and speed, temperature, and dew point. It explains that air pressure between 94.00 and 106.00 kPa is generally acceptable, how to convert between kPa and millibars, and that high pressure means dry weather while low pressure means stormy weather. It also outlines how to determine wind direction from the map and calculate speed using barbs, and how temperature and dew point are measured in degrees Celsius.
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Reading a weather map slideshare
- 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