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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 ...
Present weather symbols used on weather maps Wind barb interpretation. A station model is a symbolic illustration showing the weather occurring at a given reporting station. Meteorologists created the station model to plot a number of weather elements in a small space on weather maps.
The present weather symbol depicts the current weather which normally is obstructing the visibility at the time of observation. The visibility itself is shown as a number, in statute miles in the United States and meters elsewhere, describing how far the observer can see at that time. This number is located to the left of the present weather ...
On weather maps, the surface position of the cold front is marked by a blue line with triangles pointing in the direction where cold air travels and it is placed at the leading edge of the cooler air mass. [2] Cold fronts often bring rain, and sometimes heavy thunderstorms as well. Cold fronts can produce sharper and more intense changes in ...
The Weather Machine: A Journey Inside the Forecast. New York: HarperCollins. ISBN 978-0-062-36861-4. Ian Roulstone & John Norbury (2013). Invisible in the Storm: the role of mathematics in understanding weather. Princeton University Press. ISBN 978-0691152721.
Strong Wind (Small Craft) Warning – Issued if winds of 20 to 33 kn (37 to 61 km/h) are forecast. Gale Warning – Issued if winds of 34 to 47 kn (63 to 87 km/h) are forecast. Storm Warning – Issued if winds of 48 to 63 kn (89 to 117 km/h) are forecast. Hurricane Force Wind Warning – Issued for winds of 64 kn (119 km/h) or greater.
A prognostic chart is a map displaying the likely weather forecast for a future time. Such charts generated by atmospheric models as output from numerical weather prediction and contain a variety of information such as temperature, wind, precipitation and weather fronts.
Airport weather warning AWW – Addresses weather phenomena (including but not limited to surface wind gusts around or above 40 knots (46 mph), freezing rain, heavy snow or thunderstorms producing cloud-to-ground lightning within 5 miles [8.0 km] of the airport and/or 1 ⁄ 2-inch [1.3 cm] hail) capable of adversely affecting ground operations ...
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