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Cold Front Cross Section The cold front at the surface marks the leading edge of a dome of colder, denser airStill image:
Size: 3907 x 2198
Acquisition: Graphic, Scanned illustration
Frame rate: still
Clearance: No releases required
Location: Graphic
License: Royalty Free
Usage: Creative and Editorial
Point of view: Other
Geography: N/A
Ambiance: N/A
Time shot: N/A

Season shot: N/A

Still images available: Y
Keywords:   Wind shift, Weather Explanations, Displays and analyses, Thunderstorm, Cold, Fronts, Weather Forecasting
Asset ID: 5262
Title: Cold Front Cross Section
Concept: The cold front at the surface marks the leading edge of a dome of colder, denser air
Detail: In a typical mid-northern latitude cold front, the advancing dome of cold air generally sweeps from the north and west towards the south and east. If the warm air is sufficiently unstable and moist, thunderstorms form ahead of, or just behind the frontal discontinuity at the surface. It should be kept in mind that the front is really the surface intersection of a dome of cold air. The further one goes behind the frontal position at the ground, the deeper the dome of cold air above. Since cold air is heavier than the warm air it replaces, there is often a rather sharp rise in pressure with the passage of a cold front. According to text books, in a cold frontal passage, both the temperature and dew point of the air drop though, not necessarily the relative humidity. Pressure which had been falling, will begin a steady rise with the winds shifting from a southerly to more westerly or northwesterly direction. While most air mass transitions are gradual and take several hours, there have been cases of extremely sharp cold fronts producing temperature falls of 20 to 30 in one hour or less.

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