When a warm front is approaching, what happens? A. advancing cold air pushes up and over retreating warm air causing warm temperatures and mild rain
B. advancing warm air pushes up and over retreating cold air causing warm temperatures and mild rain

The air mass behind a warm front is likely to be warmer and more moist than the one before the front. If a warm front is approaching, light rain or light winter precipitation is possible before and as the front passes. Behind the front, expect clearing skies, warmer temperatures and higher relative humdities.

Explanation:

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