prolonged exposure to temperatures as warm as 60☏ (16☌), particularly in water, can trigger hypothermia if you are not properly dressed. When your body temperature sinks below 96☏ (36☌), you have hypothermia. Therefore, you cannot just rely on the wind chill value alone to determine your risk of frost bite. This is because of the wind's ability to remove heat. Yet at a relatively higher temperature of -5☏ frostbite is a threat still in 10 minutes or less with a 35-mph wind speed. You will also notice how the wind speed affects the onset of frostbite.įor example, at -40☏ and wind speed of just 5 mph, frostbite can occur in 10 minutes or less. Note that while no frostbite can occur with air temperatures above freezing regardless of wind speed hypothermia is still a danger. I addition to the wind chill the chart above shows the approximate times for the onset of frostbite. The most susceptible parts of the body are fingers, toes, ear lobes, and the tip of the nose. Frostbite occurs when your body tissue freezes. Hypothermia occurs when body core temperature, normally around 98.6☏ (37☌) falls below 95☏ (35☌). What is important about the wind chill besides feeling colder than the actual air temperature? The lower the wind chill temperature, the greater you are at risk for developing frost bite and/or hypothermia. Your wind chill temperature is the value where lines drawn from the air temperature and wind cross. Find the value that most closely represents your present wind speed. To determine the wind chill temperature, find the value closest to your outside air temperature. For example, if the temperature outside is -5☏ (-21☌) and the wind chill temperature is -31☏ (-35☌), then your car's radiator temperature will be no lower than the air temperature of -5☏ (-21☌). The inanimate object will not cool below the actual air temperature. The only effect wind chill has on inanimate objects, such as car radiators and water pipes, is to shorten the amount of time for the object to cool. At this level, exposed skin can freeze in just a few minutes. If the temperature is 0° F (-18° C) and the wind is blowing at 15 mph (13 kt / 24 km/h), the wind chill temperature is -19☏ (-28☌). The wind chill temperature is based on the rate of heat loss from exposed skin caused by wind and cold and is to give you an approximation of how cold the air feels on your body.Īs the wind increases, it removes heat from the body, driving down skin temperature and eventually the internal body temperature. The wind chill is the effect of the cold wind on people and animals. Cold air alone can be deadly but when the air is moving if feels much colder. Just as there are persistent hot places around the world, there are persistent cold places.
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