Overcast and cool

Good morning Augusta Maine.

This morning it is overcast with the chance of snow showers in the morning changing to partly sunny with a slight chance of snow. The temps will top out in the 30's. Winds will start out being light and variable, changing to 10 mph later during the day.

Tonight it will be mostly clear with temps dropping to around 10 above zero. Winds will be out of the North at 10 mph, changing to light and variable winds.

The readings outside right now are:

a relative humidity of 78% with a Dew Point of 29.4ºF.

The temperature is 31.1ºF with almost no wind chill.

The wind velocity this morning is between 1.8 mph and 2.8 mph out of the North. The highest wind recorded in my cornfield in the past 3 months is 35.6 mph, and that wind velocity was not reached yesterday.

Our Barometric pressure is 29.97 and rising. The weather graphic indicates sun today.

We had no precipitation overnight.

Visibility is 10.0 miles, and it is overcast to 4,100 feet.

You have probably heard weatherpeople on the TV news talking about the windchill factor. The windchill factor is the temperature that a person feels because of the wind. For example, if a thermometer reads 35 degrees Fahrenheit outside and the wind is blowing at 25 miles per hour (mph), the windchill factor causes it to feel like it is 8 degrees F. In other words, your 98-degree body loses heat as though it is 8 degrees outside.

The windchill factor is the same effect that causes you to blow on hot soup to cool it down. The movement of the air increases the soup's loss of heat by convection, so the soup cools down faster.

For an inanimate object, windchill has an effect if the object is warm. For example, say that you fill two glasses with the same amount of 100-degree water. You put one glass in your refrigerator, which is at 35 degrees, and one outside, where it is 35 degrees and the wind is blowing at 25 mph (so the windchill makes it feel like 8 degrees). The glass outside will get cold quicker than the glass in the refrigerator because of the wind. However, the glass outside will not get colder than 35 degrees -- the air is 35 degrees whether it is moving or not. That is why the thermometer reads 35 degrees even though it feels like 8 degrees.

If you want to calculate your own Wind Chill, there is a wind chill Calculator online at:

http://www.learner.org/interactives/weather/act_windchill/

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