Stationary fronts prolong bad weather
http://www.usatoday.com/weather/tg/wsfront/wsfront.htm

John Herne, USA Today


These simple animated GIF's are activated with cursor rollover and picture the standoff when neither the warm front nor the cold front is advancing. On a weather map the stationary front is marked by alternating triangles and half circles with the triangles pointing toward the warm air and the circles pointing toward the cooler air. The overriding of warm air on the cooler air can bring several days of cloudy, inclement weather. While the front appears to touch the ground the actual boundary between air masses can be thousands of feet aloft and hundreds of miles away.

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This resource is referenced here:Keywords: stationary fronts, fronts, meteorology, atmosphere