Sentences with phrase «colder air near the surface»

Clouds and often precipitation occur on the poleward sides of both warm and stationary fronts and whenever tropical air reaching the latitude of the polar front is forced upward over the colder air near the surface.

Not exact matches

A low - altitude flow of warm, moist air from an ocean area combined with a flow of cold, dry polar air high up creates maximum instability, which means that parcels of air heated near the surface rise rapidly, creating powerful updrafts.

This means that as the dense cold air flows towards the low spot and pools there the influence of the large scale wind decreases to zero in a shallow layer near the surface.

(1) Most of the warming would actually occur near the surface in areas with shallow cold dry air masses, such as in Siberia and northern Canada where it would not have a large effect.

Cold - cloud rain occasionally will refreeze if a layer of subfreezing air exists near Earth's surface.

In other words, UHI * is the value of the urban - heat - island effect if wind were not reducing it by replacing warmer air with colder; and NSTI * is the effect of the near - surface temperature inversion if the wind were not mixing up the air near the ground with the air a little higher up.

There is also an increased upwelling of deep cold ocean waters and more intense uprising of surface air near South America, resulting in increasing numbers of drought occurrences, although fishermen reap benefits from the more nutrient - filled eastern Pacific waters.

... bodies situated on or near to the surface of the earth become, under certain circumstances, colder than the neighbouring air, by radiating more heat to the heavens than they receive in every way...