When the ground position of a front moves so that warm air occupies territory that was previously held by cold air, <u>It is knows a </u><u>warm front.</u>
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The area where a warm air mass is replacing a cold air mass is known as a warm front.
The air behind a warm front is warmer and more humid than the air in front of it. Warm fronts typically migrate from the southwest to the northeast.
A warm front is a density discontinuity that is usually seen on the margin of an isotherm gradient that faces the equator and is situated at the leading edge of a homogenous warm air mass.
Since warm air is thicker and more difficult to remove from the surface of the Earth than cold air, warm fronts move more slowly than the cold fronts that typically follow them.
