The air flowing from the polar high pressure area to the low latitude area, due to the effect of the deflection force of the earth's rotation, is always eastward, forming the northeast wind in the high latitude area of the Northern Hemisphere, and forming the northwest wind in the high latitude area of the Southern Hemisphere.These areas where the surface wind is mainly easterly wind are called "polar easterly belt".[2]
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In the Northern Hemisphere, the wind direction in the high latitude area is subject to local weather disturbance and is variable.The outward spiral flow in the polar easterlies of the Antarctic continent is a prevailing circulation.
The area around 60 degrees latitude is where the polar easterly wind and the mid latitude westerly wind intersect each other.The nature of the two kinds of air flows is very different. The warm air flow climbs along the cold air flow, and a polar front is formed between the two kinds of air flows, resulting in variable weather.[1]
