W

Warm front: A boundary between a warm air mass that is replacing a cooler air mass. Explore Weather Fronts. Warning stage: The level of a river or stream that may cause minor flooding, and at which concerned interests should take action. Waterspout: A tornado over water. Waves: ocean **includes animations Weather fronts **includes animations White dwarf: The small and hot remnants of a red giant star that has lost its outer layers. Wind advisory: Sustained winds 25 to 39 mph and/or gusts to 57 mph. Wind chill factor explanation and chart Wind shear: The change of wind speed or direction with distance, usually vertical.

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