Sunday, November 12, 2006

Getting Chilly?

Strange. Yesterday the temperature was the same as today, a nice 20°C. Yet it feels much colder, due to the higher speed of the wind.

The temperature you experience or feel depends on the real temperature ( Ta ) you measure and the speed of the wind ( V ).

The more wind, the more cooler. This effect is called :

The windchill Effect

Wind chill is the meteorological index that combines the effects of wind speed and temperature. The wind makes you feel colder for two reasons. First, it blows away a thin layer of warm air that normally surrounds your body. Second, it draws away heat by quickly evaporating any moisture that forms on your skin. That's why you feel chilled when you step out of the shower. The stronger the wind, the greater the evaporation and the colder you feel.

There's even a formula to calculate the Windchill temperature:

Twc = 13.112 + 0.6215 Ta -11.37 V0.16 + 0.3965 Ta V0.16

When you're on your ski's on a winter-sports holiday, you'll probably have recognized this effect.

Windchill chart

Air Temperature (°C)


But the apparent temperature does not only depend upon the speed of the wind, it's also influenced by humidity an the radiation of the sun.

Read more about this at:

CochraneWx Weather Terminology

Now compare this windchill effect with taking decisions in your "real life".
How often do you act solely upon your last experience, when dealing with a new opportunity?
Did you count (new) external influences - like "the wind" - in?
And don't blow too hard yourself, it might feel others "chilly" or catch a cold.

Remember anyhow:

Cold Love

If you can't catch a cold from someone who doesn't have one,

how can you get love from someone who doesn't have it?

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