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When contrasting air masses

lie side by side, the narrow zone of discontinuity, separating the two masses is called a front. So when cold airmass meets and displaces a warmer airmass, the front that is formed is called cold front

.
Along a cold front, heavy rain

or snow,frequent thunderstorms, severe turbulance, line squalls and heavy icing may occur.Along the front a well marked wind shift of 45 degrees to 180 degrees may be noticed.The front may have a slope of 1/40 to 1/80.Cloud systems precede the cold front upto over 100 miles ahead and gusty winds occur in the rear.The rain belt may be 50 to 100 miles wide.Occasionally tornados may also form.

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Condensation

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water vapor

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Q: What will form when a moist air mass moves over a cooler surface?
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Fog forms over the ocean on summer mornings when warm, moist air moves over the cooler surface of the water. As the warm air comes into contact with the cooler water, it cools down, causing the moisture in the air to condense and form tiny water droplets or ice crystals, resulting in fog. This process is known as advection fog.


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