The wind chill index is a crucial measurement that helps us understand how cold the air feels when wind is factored in. Unlike the actual temperature, the wind chill index accounts for the chilling effect of wind on our skin, making it feel much colder than the thermometer suggests.
Wind chill occurs when the body temperature lowers due to the passing flow of lower temperature air. Wind chill speeds have a major effect on the body and cause hypothermia or frostbite to occur quicker than freezing temperatures without wind.
The combination of wind and freezing temperatures can be deadly.
Wind Chill Index
The index helps you determine when dangerous conditions develop that could lead to frostbite or hypothermia. The index takes into account heat loss from the body to its surroundings during windy and cold weather. The calculation of the index utilizes wind speed in Miles Per Hour (MPH) and temperatures in degrees Fahrenheit (˚F ).
As an example, if the temperature outside is 15˚F and winds are 25 MPH, the temperature actually feels like -4˚F on the body. Wind chill values near – 25˚F means frostbite is possible within 15 minutes.
To use the index, find the current temperature and the wind speed on the index. The number that aligns is what the temperature feels like outside.
Survival Tips for the Cold
When cold weather is a threat:
- Stay Dry: Wet clothes can result in faster heat loss from your body
- Stay Covered: Wear mittens or gloves, a hat, and waterproof insulated boots; at least half of your body’s heat is lost if your head is not covered
- Dress in Layers: Trapped air between loose fitting clothing helps to insulate your body
- Stay Informed: Have a portable NOAA weather radio nearby to keep you up-to-date with the latest forecasts and warnings
- Utilize the Wind Chill Index: Use the index to guide you in dressing properly for outdoor weather
Conclusion
The wind chill index is a vital tool for understanding how cold it truly feels outside, factoring in both temperature and wind speed. By using this index, we can better prepare for harsh winter conditions, dress appropriately, and avoid the risks of frostbite and hypothermia.