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Fastest ever recorded: 484±32 km/h (301±20 mph) (3-second gust); calculated by a DOW (Doppler On Wheels) radar unit in the 1999 Bridge Creek–Moore tornado between Oklahoma City and Moore, Oklahoma, USA, 3 May 1999. Recently, the wind speeds were re-examined and adjusted to a maximum official wind speed of 321 mph (516.6 km/h).
It is also believed to be called the "Windy City" because of politicians in the area blowing hot air. In terms of climate, Chicago is slightly windier than the average American city. Average wind speeds range from 8 miles per hour (13 km/h) in summer to 12 miles per hour (19 km/h) in spring.
Average wind speeds "blowing off the prairie" are greater in the Chicago area. Statewide, the wind speeds average 8 to 12 miles per hour (13 to 19 km/h), and is greater in the winter than in summer. Snowfall averages 30 inches (760 mm) in the north and 10 inches (250 mm) in the south, although the actual snowfalls vary greatly by year.
Average yearly precipitation for Illinois varies from 48 inches or 1,220 mm at the southern tip to 35 inches or 890 mm in the northern portion of the state. Normal annual snowfall exceeds 38 inches or 0.97 m in Chicago , while the southern portion of the state normally receives less than 14 inches or 0.36 m. [ 1 ]
A wind rose plot may contain additional information, in that each spoke is broken down into color-coded bands that show wind speed ranges. Wind roses typically show 8 or 16 cardinal directions , such as north (N), NNE, NE, etc., [ 2 ] although they may be subdivided into as many as 32 directions .
A cold front is expected to blow through North Texas Thursday morning, drastically dropping temperatures. Hypothermia could be a result of wind chills if precautions are not taken.
In common usage, wind gradient, more specifically wind speed gradient [1] or wind velocity gradient, [2] or alternatively shear wind, [3] is the vertical component of the gradient of the mean horizontal wind speed in the lower atmosphere. [4] It is the rate of increase of wind strength with unit increase in height above ground level.
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