When evaluating the data note that it has been coded. Surface air pressure normally ranges from 970 to about 1045 mb. Draw in the position 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. Indicate the position of any high and low pressure centers. Centers of pressure, high or low, are found at the center of a series of enclosed isobars. Approximately how far north of the warm front are stations recording precipitation in Figures 4.5a and b .