weather term
Warm Front
The leading edge of an advancing mass of warmer air, which typically brings a longer period of lighter, steadier rain than a cold front.
A warm front slides up and over the cooler air ahead of it in a gradual slope, rather than forcing it up sharply the way a cold front does, which is why warm fronts tend to bring extended spells of drizzle or light rain rather than sudden downpours. Temperatures usually rise slowly and steadily as a warm front passes, rather than the abrupt shift seen with a cold front.