Speed (m/s) = SQRT( u^2 + v^2) Direction = arctan(v / u) I get 264° @ 0.173 m/ s---A common problem that arises in vector addition when the components of the resultant vector are found is the arctan function in calculators cannot distinguish the quadrant of the angle. If the resultant vector termintates in Quadrant I or II, add 180°.Background: Using the gridded atmospheric motion vector output u and v AMV components are averaged over an upper layer (150, 200, 250, and 300 hPa) and a lower layer (700, 775, 850, and 925 hPa). The difference in these averaged components is used to compute the speed shear between the upper and lower layers.
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Key to Atmospheric Motion Vector (AMV) Satellite Image Maps . Page Up. Learn about Atmospheric Motion Vectors to determine Wind Direction and Speed. These symbols [ Wind Vector Barbs] will tell you to which direction the wind will take the clouds, so you will have a first hand idea on the weather play in the region. Page Up
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(See the NDFD site for precise details; our timestamp shows time of download.) And for those of you chasing top wind speed, note that maximum speed may occur over lakes or just offshore. If you're looking for a weather map, or just want more detail on the weather today, see these more traditional maps of temperature and wind.The 03002 uses a cup wheel assembly to measure wind speed. Rotation of the cup wheel produces an ac sine wave that is directly proportional to wind speed. The frequency of the ac signal is measured by a data logger pulse count channel, then converted to engineering units (mph, m/s, knots).