The humidex is a complex, made in Canada formula, that incorporates actual air temperature and relative humidity. It represents what the air feels like on our skin in relation to our body's ability to cool itself through the evaporation of sweat. The higher the combination of air temperature and relative humidity the harder it is for the body to cool itself. This combination makes us feel hotter under hot and humid conditions than under hot and dry conditions. This puts some weight behind the cliche, it's not the heat it's the humidity.
The actual formula looks like this:
Humidex = T + 5/9 x (e - 10)
where:
e = vapour pressure(6.112 x 10^(7.5 x T / (237.7 + T) x H / 100)
T = Air Temperature (Degrees Celsius)
H = Humidity (%)
If your brain hasn't exploded or you haven't passed out yet here's a rough but easy formula for calculating humidex that can get you in the ballpark:
Humidex = T + Td - 12
Where:
T = Temperature
Td = Dew Point
So if the temperature is 30C and the dew point is 25C The humidex would be approximately 43. That's hot!
Try to calulate today's humidex in Toronto. Temperatures right now are standing at 33C, the dew point is standing at 18C. Use the formula. You can email me the answer to city.weather@yahoo.ca and I'll also give you the answer later on my blog when I put the "egg heat test". That'll take place around 1:00pm when it's the hottest outside! I COMPLETED THE EGG HEAT TEST, BUT I AM TRYING TO FIGURE OUT HOW TO POST VIDEOS. STAY TUNED.
CLICK HERE FOR INFORMATION ON THE SEVERE THUNDERSTORMS IN TORONTO.
Chris
city.weather@yahoo.ca
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