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A cold front is the leading edge of a cooler mass of air at ground level that replaces a warmer mass of air and lies within a pronounced surface trough of low pressure.It often forms behind an extratropical cyclone (to the west in the Northern Hemisphere, to the east in the Southern), at the leading edge of its cold air advection pattern—known as the cyclone's dry "conveyor belt" flow.
The warming of the air near to the ground leads to rising movements and the atmosphere becomes less stable. One of these patterns is the air pressure difference between the Arctic and mid-latitudes: the Arctic oscillation with the Azores highs and Iceland lows known from the weather reports. If this difference is high, a strong westerly wind ...
"Cold arctic air gripped western Europe in the first three weeks of December. Two major snowstorms, icy conditions, and frigid temperatures wreaked havoc across much of the region...The harsh winter weather was attributed to a negative Arctic Oscillation, which is a climate pattern that influences weather in the Northern Hemisphere.
The plot of mean sea level pressure over the winter months [clarification needed] shows a large area of high atmospheric pressure in the South of Siberia.. The Siberian High affects the weather patterns in most parts of the Northern Hemisphere: its influence extends as far west as Italy, [3] bringing freezing conditions also in the warm South, [4] and as far southeast as Malaysia, [5] where it ...
An area of high pressure that originated in the Arctic has plunged southward across the region, providing the cold air to support snow, and moisture from the Pacific Ocean and Gulf of Mexico will ...
Once arctic air moves over an unfrozen ocean, the air mass modifies greatly over the warmer water and takes on the character of a maritime air mass, which reduces the strength of the high-pressure system. [17] When extremely cold air moves over relatively warm oceans, polar lows can develop. [18] However, warm and moist (or maritime tropical ...
Nearly 80 million Americans will be below 0°F by next Tuesday when extremely cold Canadian / Siberian Arctic air descends on the Lower 48. The nationwide average low temperature will be only 6°F ...
A major outbreak of cold, stormy weather could snarl travel at higher elevations of the northwest United States and British Columbia this week, AccuWeather meteorologists say. The pattern will hit ...