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Weather Conversion Calculator
Collection of unit converters related to weather data. Covers distance, speed, pressure, weight, volume, wind chill, temperature, humidity, heat index, density/pressure altitude, and more. Includes units such as meters, yards, nautical miles, knots per hour, millimeters of mercury, millibars, grams, troy pounds, liters, imperial gallons, and dew point. From a member of the U.S. Army.
http://www.eustis.army.mil/WEATHER/Weather_Products/wxconversions.htm

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