Answer :
A wind shift from the south or southwest to the northwest is commonly associated with the passage of a cold front.
A cold front is the leading edge of a cooler mass of ground-level air that replaces a warmer mass of air in a conspicuous surface trough of low pressure. The cold front advection pattern, also known as the cyclone's dry "conveyor belt" flow, which is to the west in the Northern Hemisphere and to the east in the Southern Hemisphere, is where it frequently forms at the leading edge of extratropical cyclones.
The difference in temperature between the two sides of the barrier may exceed 30 °C (54 °F). If there is enough moisture in the air, rain can fall along the boundary thunderstorms may form along the frontal zone. If instability is weak, a large shield of rain may move in behind the front; the evaporative cooling of the rain may increase the temperature difference across the front. Cold fronts are at their strongest during the transitional seasons of fall and spring, and at their weakest during the summer.
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