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Some sites I've just looked at, mention the effect of direct sunlight on heat index. Up to 8 C, I've just been trying to find out the difference between sun and shade readings.
If the windspeed is small enough, the 4th term will have more of an effect than the 3rd term, and the Wind Chill will be greater than the air temperature. The 4th term is meant to make the wind chill effect less strong at warmer temperatures, but at a warm enough temperature and small enough wind speed, it will make the wind chill greater than the air temperature which makes no sense.
Looking at the bottom of the page:
Windchill Temperature is only defined for temperatures at or below 50 degrees F and wind speeds above 3 mph.
Probably defined that way to prevent the formula from giving silly results. The weather forecasters should have not listed the wind chill.
On this date today last year I remember it was rather hot, with a high of 90°F (32°C), Was distinguishable from a summer's day really due to the cold morning and very low dew point. I haven't looked it up but it could have been the earliest it's gotten that warm in my lifetime.
That day had a morning temperature of 40°F (4.5°C) and was sunny.
I was thinking about that today. Reached 89 F here. Today was cloudy and cool with a high of only 50 F. Much better!
April 7th is way too early for that kind of heat. At least it was dry though.
50s are perfect.
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Case's Currents
