The (http://www.nws.noaa.gov/om/cold/wind_chill.shtml) wind-chill
chart by NWS uses only those two quantities while AccuWeather's "(http://www.accuweather.com/en/weather-news/what-is-AccuWeather-realfeel/7198202) RealFeel" index adds in effects such as cloud cover and sun angle.
The chief source of concern is the wind-chill
factor, which produced an air temperature of -6.5C at Kempton yesterday, is forecast to dip to -9C on Christmas Day night and is not predicted to improve until the following day.
"Sheep use substantial energy just staying warm, and lose a lot of heat when it's cool, especially when there's a wind-chill
"The Met Office tell uswe are due an estimated wind-chill
factor of minus 9C.
It is now 100mm longer, and a Macrolon screen now shields the operator from wind-chill
where warehouses are unheated, and document and bottle/cup holders are now supplied as standard.
Daytime temperatures are expected to dip as low as 1C (34F), with the wind-chill
factor making it feel even colder.
The temperature is a relatively balmy minus 21, but when you account for the wind-chill
factor, it feels about minus 40.
Scotland's Louise Scott and American Tom Ferrel provide the biggest threat to the Scandinavian over a course where temperatures can fall to the equivalent of -50infinityC with the wind-chill
We're speaking, of course, of the wind-chill
factor, and the perverse thrill to be had upon hearing it announced over the airwaves.
My skin wasn't freezing in 15 seconds," like the meteorologists had warned when advising of the super-low wind-chill
It stays out there until the Northern California fog and wind-chill
seize control of the field.