In addition to a warm front, mountains help exasperate the situation through cold air damming. Cold air, which is denser than the warm air advected toward the mountain gets trapped east of North American mountain ranges such as the White Mountains in New England and the Appalachians in the Carolinas. The warm moist air then overruns this cold air, generating precipitation. If the warm air is above freezing, rain will fall from the warm layer and freeze in the cold layer.
References:
USA Today
WW2010
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