wind speed and direction
Being able to quicky convert wind speed values from units like knots, beaufort, m/s and km/h to another is quite helpful when you're in a pinch. Terms such as 'severe gale', 'storm', etc are also used to describe winds of 41 knots or greater.Sunshine is measured using either Campbell-Stokes sunshine recorders or modern sunshine sensors. The instruments used to measure wind are known as anemometers and can record wind speed, direction and the strength of gusts.Wind speed normally increases with height above the earth's surface and is much affected by such factors as the roughness of the ground and the presence of buildings, trees and other obstacles in the vicinity.The optimal exposure for the measurement of wind is over level ground of uniform roughness with no large obstacles within 300 m of the tower. Designed with strictest accuracy requirements of Class 1 anemometers for the wind energy market and for durability and ease of use in weather stations. The instrument measures the speed of acoustic signals transmitted between two transducers located at the end of thin arms. For your convenience, tables for conversion and wind speed impact on land and sea are provided for you to download as well. Updated every three hours. See the current wind in the world and windgusts. Consequently, a wind blowing from the north has a wind direction of 0° (360°); a wind blowing from the east has a wind direction of 90°; a wind blowing from the south has a wind direction of 180°; and a wind blowing from the west has a wind direc… Move the marker on the wind map and check the forecast for the selected place. Enter value in any field, the converted values will be calculated automatically. the elusive nautical mile) with our calculator. Do you have feedback? Wind direction is determined by the direction from which it originates. Are you missing any calculations? Using the wind radar map, you can predict the wind direction and check where the gusty wind is. See current wind, weather, ocean, and pollution conditions, as forecast by supercomputers, on an interactive animated map.
US Dept of Commerce National Oceanic and Atmospheric Administration National Weather Service Gray - Portland, ME P.O. The instruments used to measure wind are known as anemometers and can record wind speed, direction and the strength of gusts. In practice few sites in the observing network meet this requirement exactly for all incident wind directions, but most are reasonably representative of an open site.Wind speed is normally measured by a cup anemometer consisting of three or four cups, conical or hemispherical in shape, mounted symmetrically about a vertical spindle. Mean wind over other averaging periods may also be calculated. The arm is carried on a vertical spindle mounted on bearings which allow it to turn freely in the wind. Wind today, live map and prediction radar. A gale is defined as a surface wind of mean speed of 34-40 knots, averaged over a period of ten minutes. Calibration corrections are applied to the measured wind speed.Wind direction is measured by a vane consisting of a thin horizontal arm carrying a vertical flat plate at one end with its edge to the wind and at the other end a balance weight which also serves as a pointer. In standard instruments the design of the cups is such that the rate of rotation is proportional to the speed of the wind to a sufficiently close approximation.At intervals of no longer than five years, anemometers are calibrated in a wind tunnel to identify any departures in the relationship between spindle rotation and wind speed specified by the manufacturer. For example, a northerly wind blows from the north to the south. The Elliptic cups design of our Wind Speed & Direction Sensor creates more torque and linearity for improved data consistency vs. conical cups over a wide range of weather conditions. Wind speed units & wind directions Being able to quicky convert wind speed values from …
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