Answer: when two air masses meet and neither one takes over
stationary front
Stationary fronts are said to be formed when a polar air mass loses its own characteristics and stops flowing in a particular direction. Both the warm and cold fronts if not moving with enough speed or strength to take over the other shall lead to the formation of a stationary frontal zone.
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In the case of a stationary front neither the warm or cold air is strong enough to take over the other or replace the other. The result is a front that stays stationary until one can dominate the other or it dissipates altogether. The type of weather that is typically found with that of a stationary front is usually what we have had this weekend.
A stationary front is a boundary between two different air masses neither of which is strong enough to replace the other. On a weather map this is shown by an inter-playing series of blue spikes pointing one direction and red domes pointing the other.
A stationary front forms when a cold front or warm front stops moving. This happens when two masses of air are pushing against each other but neither is powerful enough to move the other. Winds blowing parallel to the front instead of perpendicular can help it stay in place. A stationary front may stay put for days.
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A stationary front is similar to a warm front i.e. warm air is present behind it ...