Meteorology can be a fascinating subject. The rewards are much greater than the effort put into the study of weather. This is especially true in the case of contractors, for whom the weather is the major factor in scheduling work. To be weatherwise, you must think in terms of the weather map. Fit in every wind, every cloud type, and every other weather element with the pattern of the weather. It takes practice to learn how to "read" the weather but once the habit is acquired, the meteorological picture comes into clear focus. Winds blowing into the low pressure center are deflected and work their way inward in a counterclockwise, circular fashion. These winds, coming from different geographical regions, haul in air that is typical of their sections: south wind, warm and humid; east wind, cool and damp; northwest wind, cold and dry. The air types are incompatible. Each retains its own identity, being clearly separated by fronts. Weather is at its worst along these boundary lines. Warm air , coming into the swirl from the south, is lighter than the other air masses and is forced aloft. It spreads out into sheetlike clouds that are carried ahead of the storm by westerly winds aloft- the same winds that steer the low in an easterly direction. Heavy, cold air plunging into the west side of the low hugs the ground and forces the warmer air aloft. The leading edge of this cold air is the "cold front." along this line weather is "sharp," with squalls, thunderstorms and gusty winds. This is in contrast to weather on the eastern side of the low, where gently lifted warm air brings about widespread cloudiness and precipitation, and changes occur more gradually.