Thursday, October 11, 2007

Ingredients for a Cold Night















Some people might say that the past two mornings have been cold, but that is only because it has been so warm recently. Lows the past two mornings have bottomed out in the mid-40s, which is still above average for this time of year. There are two reasons that temperatures have been held up a bit. The first is that we have had substantial cloud cover to insulate us at night. The second is the strong winds that continually stir up the atmosphere. Warm air always rises above cold air. When blustery winds at the surface churn up the atmosphere some of that slightly warmer air overhead gets circulated down near the ground.

The ingredients will be in place the next two nights to cook up some frosty conditions across the Stateline. First off, the thick clouds from the past couple days will thin out as high pressure from central Canada slides southward. Secondly, the wind speeds will finally calm down across the area. These two factors will allow any heat gained during the daytime hours to be freely released into the atmosphere. Low temperatures, typically observed near sunrise, the next two nights shouldn't have a problem dipping into the 30s. -ADAM

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