| Caption: |
Weather fronts mark the boundary of air masses that have different densities, generally as the result of differences in temperature. (a) Advancing cold front that forces warm air upward. The rising warm air can create clouds and heavy precipitation. (b) Advancing warm front which forces warm air to rise over cooler air. Clouds and precipitation may develop. (After McKnight, T. L., and Hess, D. 2004. Physical geography, 8th ed. Upper Saddle River, NJ: Pearson Prentice Hall) |
| Keywords: |
atmosphere, midlatitude cyclones, middle-latitude cyclones, warm fronts, precipitation, nimbostratus clouds, altostratus clouds, cirrostratus clouds, cirrus clouds, cold fronts, cumulonimbus clouds, thunderstorms, precipitation |
