Measuring Pressure at the surface - the surface pressure chart
Surface pressure chart - isobars (lines of constant pressure) are plotted every 4 mb
Maps of surface pressure are very important:
- give positions of highs and lows
- can give information about the direction and strength of the surface winds
Q: How is a surface pressure chart created from observations around the country???
- remember that the station elevation will dramatically affect your pressure reading.....
Sea-Level Pressure Chart (Constant Altitude)