Figure 4.4a is animated below and demonstrates the drawing and placement of the isobars. Centers of high and low pressure Centers of pressure, high or low, are found at the center of a series of enclosed isobars. Figure 4.4a is animated below and demonstrates the placement of the dominant pressure center on this map. Location of any fronts Examine the station data to determine abrupted spatial changes in temperature and wind direction. The temperature coded data is found to the left of the station's circular marker.
Wind direction is illustrated by a line pointing into the station marker.
Behind a cold front, temperatures are generally cold and winds blow from the north-west. For a warm front, temperatures are generally warm and winds blow from the south or south-west behind the front, while ahead of the front temperatures are cooler and winds are from the east or southeast. Sharp temperature changes over a relatively short distance. Changes in the air's moisture content as shown by marked changes in dew point. Shifts in wind direction.