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You can also approximate the wind chill with a little mental math: If the temperature is minus 13 degrees and the wind speed is 15 mph, the wind chill will be somewhere between minus 32 and minus 39.
Wind chill index values for a range of temperatures and wind speeds, from the standard wind chill formula for Environment Canada. Wind chill (popularly wind chill factor) is the sensation of cold produced by the wind for a given ambient air temperature on exposed skin as the air motion accelerates the rate of heat transfer from the body to the surrounding atmosphere.
The weather service began to include wind chill in their forecasts in the early 1970s, several decades after Antarctic explorers first published research about it in the late 1930s.
The North American formula was designed to be applied at low temperatures (as low as −46 °C or −50 °F) when humidity levels are also low. The hot-weather version of the AT (1984) is used by the National Weather Service in the United States. In the United States, this simple version of the AT is known as the heat index.
a wind chill warning remains in effect until noon cst tuesday. * this is a particularly dangerous situation! * wind chill values: 35 to 65 below...with the coldest readings tonight and monday morning. * impacts: exposed flesh will freeze in 10 minutes with wind chills of 35 below...and in 5 minutes with wind chills of 50 below or colder.
A cold weather advisory (formerly known as a wind chill advisory until October 2024) [1] is a hazardous weather statement issued by Weather Forecast Offices (WFO) of the National Weather Service (NWS) in the United States to alert the public that temperatures or wind chills are forecast to reach values low enough that it poses a threat to human health and life if adequate protection is not ...
Wind, for example, is assumed to be 5 knots (9.3 km/h). [5] Wind passing over wet or sweaty skin causes evaporation and a wind chill effect that the heat index does not measure. The other major factor is sunshine; standing in direct sunlight can add up to 15 °F (8.3 °C) to the apparent heat compared to shade. [7]
This product replaced the Wind Chill Watch in October 2024. [42] [43] Cold weather advisory NPW – Seasonably cold air temperatures or wind chill values, but not extremely cold values, are expected or occurring. The temperature and wind chill criteria vary significantly over different county warning areas based on climate variability.