今日の英語：wind-chill - Hole In The Wall

東海岸、"bomb cyclone"で大変なことになってるけれど、天気予報でよく出てくる「体感温度」がこれ。"feels-like"とかも使う。

Wind-chill or windchill, (popularly wind chill factor) is the perceived decrease in air temperature felt by the body on exposed skin due to the flow of air.

Wind chill numbers are always lower than the air temperature for values where the formula is valid. When the apparent temperature is higher than the air temperature, the heat index is used instead.

Wind chill - Wikipedia

この"wind-chill"、標準化されているわけではないんで、各国でまちまち。アメリカの場合、

$T_{\mathrm {wc} }=35.74+0.6215T_{\mathrm {a} }-35.75v^{+0.16}+0.4275T_{\mathrm {a} }v^{+0.16}\,\!$

where T_wc is the wind chill index, based on the Fahrenheit scale; T_a is the air temperature in degrees Fahrenheit, and v is the wind speed in miles per hour.^[11]