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Atmospheric instability is a condition where the Earth's atmosphere is considered to be unstable and as a result local weather is highly variable through distance and time. [ clarification needed ] [ 1 ] Atmospheric instability encourages vertical motion, which is directly correlated to different types of weather systems and their severity.
Winter's grip will return to half of the U.S. this week as a rush of arctic air descends, plunging temperatures from well above average to nearly 30 degrees below average for some.
Round after round after round of Arctic air is poised to plunge into the central and eastern United States. AccuWeather meteorologists warn that each outbreak of Arctic air has the potential to ...
The thicker the ice, the worse its effects on infrastructure. Heavy ice of 0.25 inches or more weighs down trees and power lines and can snap branches or pull down electrical wires.
The lifted index (LI) is the temperature difference between the environment Te(p) and an air parcel lifted adiabatically Tp(p) at a given pressure height in the troposphere (lowest layer where most weather occurs) of the atmosphere, usually 500 hPa . The temperature is measured in Celsius.
Severe weather can occur under a variety of situations, but three characteristics are generally needed: a temperature or moisture boundary, moisture, and (in the event of severe, precipitation-based events) instability in the atmosphere.
A "Blue Norther" is expected to sweep through the central U.S. this weekend, bringing sudden, sharply colder air to the Plains states. (MAPS: Current Temps | 10-Day US Forecast Highs/Lows)What is ...
It is a similar phenomenon to the heat dome, and the two typically coincide as functions of strong areas of high atmospheric pressure, with both being most common during the warm season. [ 1 ] In the United States , ring of fire patterns are also commonly contributing factors to warm-season derechos , as extreme atmospheric instability builds ...