Sunday, July 12, 2015

dew - watch out for the hydrometeors!

Dew forms because the air heats and cools quicker than objects in the environment. If the temperature of air is already below the dew point then you'll see clouds or fog. If the air is above the dew point, but objects like grass are cooler, then dew will form when water vapor comes in contact with grass and is cooled past the dew point.

I was delighted to encounter the term hydrometeor. It simply refers to bits of liquid or solid water in the atmosphere. So clouds, fog, rain and snow are composed of hydrometeors. This conjures images of blazing water plowing through the atmosphere, but it just generically refers to any form of liquid or solid water in the atmosphere, including snow that gets blown off the ground and virga, which is precipitation that evaporates before it hits the ground.

So, the next time you get caught in the rain or snow you can call someone and say that you can't make it because of all the hydrometeors impacting the ground near you.

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