Warm fronts are at the leading edge of a homogeneous warm air mass and lie within broader troughs of low pressure than cold fronts .
A homogeneous warm air mass is located on the equatorward edge of the gradient in isotherms .
Warm fronts are at the leading edge of a homogeneous warm air mass , which is located on the equatorward edge of the gradient in isotherms , and lie within broader troughs of low pressure than cold fronts .