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Which of the following winds blows on the leeward slopes of the northern Alps in Switzerland?
The Foehn wind is a classic geographical phenomenon in Central Europe. When moist air from the south hits the Alps, it is forced upward, where it cools and rains. By the time the air reaches the northern slopes (the leeward side), it has lost all its moisture. As this dry air sinks into the Swiss vaRead more
The Foehn wind is a classic geographical phenomenon in Central Europe. When moist air from the south hits the Alps, it is forced upward, where it cools and rains. By the time the air reaches the northern slopes (the leeward side), it has lost all its moisture. As this dry air sinks into the Swiss valleys, it warms up rapidly through adiabatic heating. This wind is very important for Alpine agriculture because it can extend the growing season by bringing sudden warmth, though it is also known for melting snow so quickly that it can cause floods.
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See lessWhat is Chinook? (A) Local wind (B) Permanent wind (C) Prevailing wind (D) Ocean current
In meteorology, we categorize winds by their scale. Permanent winds are global, but local winds like the Chinook are caused by regional topography, such as mountains or coastlines. The Chinook is a warm, dry wind that is unique to the western interior of the United States and Canada. It is not an ocRead more
In meteorology, we categorize winds by their scale. Permanent winds are global, but local winds like the Chinook are caused by regional topography, such as mountains or coastlines. The Chinook is a warm, dry wind that is unique to the western interior of the United States and Canada. It is not an ocean current, nor is it a constant global wind. Instead, it is a periodic event triggered by Pacific air masses crossing the Rockies. Understanding this helps students see how specific landscapes, like mountains, can create their own unique weather patterns that don’t exist elsewhere.
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See lessWhich of the following local winds brings ‘blood rain’ to Italy? (A) Samoon (B) Simoom (C) Sirocco (D) Shamal
"Blood rain" sounds scary, but it is actually just a mix of desert sand and water. The Sirocco wind acts as a giant vacuum, sucking up fine silt from the North African desert. Because the dust is so light, it stays in the air as the wind travels over the sea toward Europe. When the air cools and turRead more
“Blood rain” sounds scary, but it is actually just a mix of desert sand and water. The Sirocco wind acts as a giant vacuum, sucking up fine silt from the North African desert. Because the dust is so light, it stays in the air as the wind travels over the sea toward Europe. When the air cools and turns into rain, the raindrops act like filters that pull the red dust out of the sky. This phenomenon is a perfect example of how the atmosphere connects different continents, moving parts of Africa all the way to the streets of Italy.
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See lessWhich of the following local winds is known as the ‘snow eater’?
The name "snow eater" is a literal description of what the Chinook does. Because the wind is extremely dry and warm, it performs a process called sublimation, where snow turns directly into water vapor without even melting into a puddle first. For people living in the "rain shadow" of the Rocky MounRead more
The name “snow eater” is a literal description of what the Chinook does. Because the wind is extremely dry and warm, it performs a process called sublimation, where snow turns directly into water vapor without even melting into a puddle first. For people living in the “rain shadow” of the Rocky Mountains, the Chinook is a famous winter guest. It can clear a foot of snow in a single morning. This makes it a very important wind for cattle ranchers, as it allows their cows to reach the grass buried under the winter snow.
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See lessWhich optical phenomenon creates a circular ‘Halo’ around the Sun or Moon?
For a halo to appear, thin cirrostratus clouds must be present. These clouds are composed of millions of tiny, randomly oriented hexagonal ice crystals. As light enters one side of the crystal and exits another, it is bent by 22 degrees. Because there are so many crystals, the light is refracted inRead more
For a halo to appear, thin cirrostratus clouds must be present. These clouds are composed of millions of tiny, randomly oriented hexagonal ice crystals. As light enters one side of the crystal and exits another, it is bent by 22 degrees. Because there are so many crystals, the light is refracted in a full circle around the light source. In folklore, the appearance of a halo is often said to predict rain, which is scientifically grounded: cirrus clouds are often the leading edge of an approaching warm front or a low-pressure system that brings precipitation.
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