مطالب علمی

 

Wind Chill

The feeling of temperature outdoors depends greatly on wind speed. Even slight winds give greater cooling effects than still air on any object. Weather forecasts in cold weather often give the wind chill equivalent temperature which takes into account extra cooling of the human body due to the wind. There is no accuarte method of measuring this (as it depends on the amount of your body exposed, clothing worn, humidity, sunshine and shelter).

This wind chill poses a severe hazard when low temperatures and moderate wind speeds are expierenced together.

At low temperatures a rough guide is to take the actual air temperature and subtract 1 °C and also the wind speed in m/s

Example: An air temperature of 0 °C and a wind speed of 5 m/s is approximately equal to -6 °C in calm conditions.

Actual Temperature °C
2
-1
-3
-6
-9
-12
-15
Wind Speed km/h
Apparent Temperature °C
0
2
-1
-3
-6
-9
-12
-15
8
-1
-3
-6
-9
-12
-15
-18
17
-6
-9
-12
-15
-18
-23
-26
25
-9
-12
-15
-18
-23
-25
-32
33
-12
-15
-18
-23
-26
-32
-34

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