PostHeaderIcon Warm Front

the leading edge of an advancing synoptic-scale warm-air boundary that is replacing a retreating, relatively colder air mass. Generally, with a warm-front passage, the temperature and humidity increase, and the barometric pressure rises. Although there is a wind shift—usually from the southwest to the northwest in the Northern Hemisphere—it is less pronounced than with a cold front passage. Precipitation, such as rain, snow, or drizzle, as well as convective showers and thunderstorms are generally found ahead of the surface front. Fog is common in the cold air ahead of the front. Although clearing usually occurs after a warm front passes, some conditions may produce fog in the warm air.

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