Wednesday, November 19, 2008

Classifying Cloud Cover


At the end of each day the National Weather Service gives a grade on a scale of 1-10 to classify how much sunshine was seen. You can find it in the preliminary climatology data section in this link. The sunny end of the scale is from 1-3, the partly cloudy range is from 4-7, with the overcast group covering 8-10.

As you can see from the color coded chart to the left, the first couple of weeks of November have been filled with a number of mostly cloudy days. Up until yesterday, all but five days were considered to be filled with more clouds than sun. Yesterday we broke out of that rut and it seems as though we could stay with a fair amount of sunshine on into the weekend. After a brief gray period early next week, some of the early trends are showing great driving conditions for the day before Thanksgiving and mostly sunny skies for Turkey Day. -ADAM

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