Warm Fronts

Warm fronts are a shallower and more gentle change of air mass than cold fronts.  Warm air behind the front replaces the cooler air ahead of the front.  Warm fronts move very slowly (roughly 10 knots). The polar front jet (PFJ) runs parallel to the warm front on the cold side. 

The weather associated with a warm front occurs primarily ahead of the front in the cooler air. It is primarily stratiform and continuous. Cumuliform clouds and thunderstorms can also be embedded in these clouds. Visibility is poor before passage and improves only slightly afterwards. Pressures fall gradually ahead of the front. Surface pressure can rise slowly or become steady after passage, but will fall again as the following cold front approaches. Surface winds are usually from the southeast before passage, and rotate clockwise to become gusty southwest after passage (veering winds). 

Concept Mapping Toolkit
Insitute for Human and Machine Cognition
The University of West Florida