Category: North America
WIND CIRCULATION AND MIGRATION
Tropical cyclones can be several hundred kilometers in diameter. The winds circulate counterclockwise around the center of the hurricane and transport warm, humid tropical air masses to the north on its east side. On its west side, cold air is transported to the south.
The isobars are closer and closer to the center of the hurricane. The strong pressure gradient causes very high wind speeds of sometimes more than 300 kilometers per hour. In a 10 to 30 kilometer wide zone in the core of the hurricane, the “eye of the hurricane”, however, there is almost no wind. Due to descending air masses, this area is largely free of clouds. Around the eye of the hurricane, the air masses are partially carried up into the stratosphere. Mighty cloud towers (cumulonimbus), so-called hot towers, form from which torrential rain and thunderstorms come down.
Hurricanes from the Caribbean mostly migrate clockwise north on the western flank of the North Atlantic subtropical high. The hurricanes weaken due to the falling water temperatures; this also applies when they reach the mainland. Nevertheless, they are wreaking havoc there. Often aged and increasingly weaker hurricanes reach Europe as hurricane or storm lows; their train path is embedded in the west wind drift.
USA – populations
The American nation sees itself as the “Nation of Immigrants” or “Melting Pot”, and in fact the flow of immigrants has never stopped since the arrival of the first settlers. Reliable statistical data on the number and origin of immigrants are only available for the period from 1820 onwards. (This is why the map does not contain any information for the time before.) Since then, almost 80 million people have immigrated to the USA to date; Of these, however, around 20 percent have returned to their countries of origin. For more information about the continent of North America, please check ehealthfacts.org.