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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 Short-Term Forecast NOW (alt., NOWcast) is an event-driven narrative outlook of near-term weather conditions within the Weather Forecast Office’s area of responsibility, typically valid for a three- to seven-hour period. The product outlines any ongoing or recently occurring conditions—based on radar analysis, satellite imagery and other ...
Weather is the state of the atmosphere, describing for example the degree to which it is hot or cold, wet or dry, calm or stormy, clear or cloudy. [1] On Earth, most weather phenomena occur in the lowest layer of the planet's atmosphere, the troposphere, [2] [3] just below the stratosphere.
Severe weather terminology is different around the world, varying between regions and countries. These are articles which explain terminology in various parts of the world. Severe weather terminology (United States) Severe weather terminology (Canada) Severe weather terminology (Japan) Hong Kong tropical cyclone warning signals
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.
Severe weather is one type of extreme weather, which includes unexpected, unusual, severe, or unseasonal weather and is by definition rare for that location or time of the year. [5] Due to the effects of climate change , the frequency and intensity of some of the extreme weather events are increasing, for example, heatwaves and droughts .
The first daily weather forecasts made by FitzRoy's Office were published in The Times newspaper in 1860. The following year a system was introduced of hoisting storm warning cones at principal ports when a gale was expected. FitzRoy coined the term "weather forecast" and tried to separate scientific approaches from prophetic ones. [73]
On Earth, most weather phenomena occur in the lowest layer of the planet's atmosphere, the troposphere, just below the stratosphere. Weather refers to day-to-day temperature, precipitation, and other atmospheric conditions, whereas climate is the term for the averaging of atmospheric conditions over longer periods of time. When used without ...