A stationary front is a transition zone between two air masses when neither air mass is advancing into the other. Winds on the cold air and warm air sides often flow nearly parallel to the stationary front, and often in nearly opposite directions along either side of the front. A wide variety of weather may occur along a stationary front, depending on the characteristics of its constituent air masses and the general instability of the local atmosphere. However, some common weather conditions associated with a stationary front are:

• Cloudy skies
• Prolonged precipitation, especially if one or both air masses are humid enough
• Heavy or extreme precipitation if the warmer air mass is very humid

It is important to note that a stationary front can eventually dissipate, or given a shift in upper-level winds or the relative strength of one or another of the air masses, might resume mobility as a cold or warm front.