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Global distribution of wind speed at 10m above ground averaged over the years 1981–2010 from the CHELSA-BIOCLIM+ data set [1] In meteorology, wind speed, or wind flow speed, is a fundamental atmospheric quantity caused by air moving from high to low pressure, usually due to changes in temperature. Wind speed is now commonly measured with an ...
The faster the wind speed, the faster our body heat is taken away and the colder it feels. ... was actually -5 degrees outside with no wind. Here is a chart by the National Weather Service that ...
where T wc is the wind chill index, based on the Celsius temperature scale; T a is the air temperature in degrees Celsius; and v is the wind speed at 10 m (33 ft) standard anemometer height, in kilometres per hour. [11] When the temperature is −20 °C (−4 °F) and the wind speed is 5 km/h (3 mph), the wind chill index is −24.
The components of a winds and temperatures aloft forecast are displayed as DDss+/-TT: Wind direction (DD) and wind speed (ss), displayed as a 4-digit number, e.g. 3127, indicating a wind direction of 310 degrees true north and a wind speed of 27 knots. Note that wind direction is rounded to the nearest 10 degrees and the trailing zero is excluded.
If the temperature is 0 degrees and the wind is blowing at 15 mph, the wind chill is 19 degrees below zero. Low wind chill numbers are a sign you need to dress for colder conditions.
Apparent temperature, also known as "feels like", [1] [2] is the temperature equivalent perceived by humans, caused by the combined effects of air temperature, relative humidity and wind speed. The measure is most commonly applied to the perceived outdoor temperature.
Maps using isotherms show temperature gradients, [2] which can help locate weather fronts. Isotach maps, analyzing lines of equal wind speed, [3] on a constant pressure surface of 300 or 250 hPa show where the jet stream is located. Use of constant pressure charts at the 700 and 500 hPa level can indicate tropical cyclone motion.
The station model uses a wind barb to show both wind direction and speed. The wind barb shows the speed using "flags" on the end. Each half of a flag depicts 5 kn (9.3 km/h; 5.8 mph) Each full flag depicts 10 kn (19 km/h; 12 mph) Each pennant (filled triangle) depicts 50 kn (93 km/h; 58 mph) [4]