Warm Front: A body of warm air advancing over a mass of cold air. Being forced upwards, it expands. Its moisture tends to condense in the lower temperatures at height, clouds form and rain is likely to fall.
A warm front is defined as the transition zone where a warm air mass is replacing a cold air mass. Warm fronts generally move from southwest to northeast and the air behind a warm front is warmer and more moist than the air ahead of it.
A warm front typically results when a piece of normal cold front gets caught and spun backwards by the east-to-west flow just north§ of a strong low pressure center, as shown in figure 20.7.
Get the cold front, warm front thing down pat and learn how to read the clouds for a clue as to what they are likely to do.
 See also: Front, Pilot, Force, Aircraft, Wind
  
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