Monthly Archives: February 2011

Why do Bridges Ice before the Road?

Living in a cold climate, we are used to seeing signs that say “bridge freezes before road.” The fundamental reason is that a bridge hangs above the ground, while the roadway rests on the ground. Water on a road or bridge will freeze once the surface becomes colder enough. So, the road must cool faster than the roadway. Continue reading

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What is the Coldest Wind-Chill Temperature Ever Recorded in Madison?

The wind-chill temperature describes the increased loss of heat by the movement of the air. The wind-chill is relevant to humans and other animals that need to maintain a constant temperature that is higher than their surroundings. Continue reading

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How Much does Snow Evaporate?

I notice that when the snow builds up in my patio, it starts to evaporate after a few days, even though the temperature is still below freezing. On average, what percentage of our snowfall each year evaporates back into the cold, dry air? Continue reading

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Is shoveling snow dangerous?

At least one death in Milwaukee and one death in Iowa were attributed to shoveling snow during this recent snowstorm. A study of the number and cause of deaths in Massachusetts immediately after six blizzards showed a 22 percent increase in heart related deaths following a blizzard. Continue reading

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