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Also actiniform. Describing a collection of low-lying, radially structured clouds with distinct shapes (resembling leaves or wheels in satellite imagery), and typically organized in extensive mesoscale fields over marine environments. They are closely related to and sometimes considered a variant of stratocumulus clouds. actinometer A scientific instrument used to measure the heating power of ...
A high pressure system in the upper atmosphere traps heat near the ground, forming a heat wave (for North America in this example). A heat wave or heatwave, sometimes described as extreme heat, is a period of abnormally hot weather [1]: 2911 generally considered to be at least five consecutive days.
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.
Both of these conditions must occur simultaneously for at least 3 hours in a 12 hour period, according to the NWS. There are certain instances where a red flag warning might be issued outside ...
Beyond more common weather terms lies a field of rarely used but humorous monikers to describe the weather around us. Some were just invented, some have been around for hundreds of years. Here are ...
The average and variations of weather in a region over long periods of time, which can be related to surface variables such as temperature, precipitation and wind. climate change Includes both global warming and its effects, such as changes to precipitation, rising sea levels, and impacts that differ by region. [1] climate change denial
A series of atmospheric rivers began moving through in 2022 that eventually brought an end to drought conditions. The U.S. drought monitor has four levels of drought - moderate, severe, extreme ...
Because heat waves are not visible as other forms of severe weather, like hurricanes, tornadoes, and thunderstorms, they are one of the less known forms of extreme weather. [10] Severely hot weather can damage populations and crops due to potential dehydration or hyperthermia, heat cramps, heat expansion, and heat stroke.