What is the formula for calculating wind chill?
A good approximation of the wind-chill temperature can be found by multiplying the wind speed by 0.7 and then subtracting that value from the air temperature.
How cold is 10mph wind?
Wind Chill Chart
| Temperature (°F) | Wind Speed (mph) | |
|---|---|---|
| 5 | 10 | |
| 30 | 25 | 21 |
| 25 | 19 | 15 |
| 20 | 13 | 9 |
How much does wind chill lower temperature?
As the air temperature falls, the chilling effect of any wind that is present increases. For example, a 16 km/h (9.9 mph) wind will lower the apparent temperature by a wider margin at an air temperature of −20 °C (−4 °F), than a wind of the same speed would if the air temperature were −10 °C (14 °F).
Which two considerations are used to calculate a wind chill factor?
It results in the decreasing heat energy of a body, and it is determined with the help of the two most important factors namely the speed of the prevailing wind and the temperature of the air.
How much colder does wind make it?
For example, a temperature of 0 degree F and a wind of 20 mph creates wind chill of –22 degrees F and skin can freeze in 30 minutes. If the wind rises to 55 mph, the wind chill drops to –32 degrees F, and skin can freeze in 10 minutes.
How do you calculate the feels like temperature?
We calculate a ‘feels like temperature by taking into account the expected air temperature, relative humidity and the strength of the wind at around 5 feet (the typical height of an human face) combined with our understanding of how heat is lost from the human body during cold and windy days.
How much wind is cold?
Wind Chill Temperature: Wind Chill Temperature is defined only for temperatures at or below 50°F and wind speeds above 3 mph.
Is 10 mph wind windy?
According to the National Weather Service, winds of 15 to 25 mph are considered “breezy,” while winds of more than 25 mph are considered “windy.” Another problem with wind forecasts in southern Idaho is the microclimates.
What is the sun’s temperature?
5,778 K
Sun/Surface temperature
Does wind freeze water faster?
It will not. Wind chill is a perceived air temperature, not a physical quantity. An object will lose heat in calm conditions, but wind will remove it more quickly. Water will not freeze with the temperature air at or above 33 degrees, regardless of how far the wind chill is below freezing.
What happens to warm air when it cools?
As air warms up, the molecules start to vibrate and bump into each other, increasing the space around each molecule. The opposite effect happens when air cools. As the temperature drops, molecules move more slowly, taking up less room. The amount of space the air takes up shrinks, or reduces the air pressure.
What is the formula to calculate wind chill?
To calculate the wind chill temperature, we use the Siple formula: T apparent (°C) = 33 + (T air – 33)*(0.474 + 0.454√(v)-0.0454.v) However, mainly at low temperatures and high wind speed, this formula does not give very reliable results. For wind speed, the relative speed must be filled in.
How do you calculate wind chill?
Calculate the wind chill using the National Weather Service’s new formula. Multiply the temperature by 0.6215 and then add 35.74. Subtract 35.75 multiplied by the wind speed calculated to the 0.16 power.
How to calculate a wind chill factor?
Method 1 of 3: Calculating Wind Chill Yourself Measure the temperature T. Use a thermometer or look up your location’s current outdoor temperature on a weather prediction website. Look up or measure wind speed, V. You can find wind speed estimates for your area on most weather prediction websites, or by searching for “wind speed + (the Enter these values into the formula. Adjust for sunshine.
What is the wind chill factor formula?
Wind Chill Formula. The Wind Chill Calculator uses the following formulas to calculate the wind chill factor: WC (Wind Chill, °F) = 35.74 + 0.6215 × T – 35.75 × V 0.16 + 0.4275 × T × V 0.16. Where: V is the wind speed in miles per hour (mph), T is the air temperature in Fahrenheit (°F).