The Wind Chill function is useful for identifying dangerous winter conditions that, depending on exposure times to the elements, can result in frostnip, frostbite, and even hypothermia. Wind chill is a way to measure how cold an individual feels when wind is taken into account with already cold temperatures. The faster the wind speed, the more quickly the body will lose heat and the colder they will feel.
The formula the function uses to compute heat index is as follows:
WS16 = np.pwer(WS, 0.16) Output Wind Chill = 35.74 + (0.6215 * T) - (35.75 * WS16) + (0.4275 * T * WS16)
- T= Air Temperature
- WS = Wind speed
Temperature Raster—A single-band raster where pixel values represent ambient air temperature.
Temperature Units—The unit of measurement associated with the input temperature raster. Available input units are the following:
Wind Speed Raster—A single-band raster where pixel values represent wind speed.
Wind Speed Units—Defines the unit of measurement for the wind-speed raster. Speeds are available in one of the following units:
- Miles per hour (MPH)
- Kilometers per hour (KPH)
- Meters per second (m/s)
- Feet per second (ft/s)
- Knots (kn)
Wind Chill Units—The unit of measurement associated with the output wind chill raster. Available units are the following:
Steadman, Robert G. "Indices of Windchill of Clothed Persons." Journal of Applied Meteorology and Climatology (JAMC) 10.4 (1971): 674–683.
National Weather Service. "NWS Wind Chill Chart." http://www.nws.noaa.gov/om/winter/windchill.shtml