Sunday, December 11, 2011

Weather Rewind, December 4-10, 2011

 Last week's weather was warm by December standards -- averaging out to 7.4 degrees above average as we had a three day run of 60 degree highs.  Those highs in themselves are mild but having a 57 degree overnight low in the middle of that run is going to do wonders to any temperature departure.  Our low on Tuesday (57) was a record warm low for the date and also part of a day that featured average temperatures 20 degrees above average.   Reality did arrive in the wake of the cold front and coastal low's passage through the region on Wednesday night, along with two inches of rain that soaked much of the region, as temperatures from Thursday through Saturday were much more "typical" of December.   Saturday morning's low of 31 was our coldest so far this cold season until this morning.

The big story of the past week was the midweek storm that brought between two and three inches of rain to the region and brought anywhere from a coating of snow to several inches of snow over the Poconos.   After a moderately dry stretch of weather from late September through mid November, Snowtober notwithstanding, we've reentered a wet pattern across the Mid Atlantic as the mean storm track has generally been overhead or to our west.  Resulting precipitation has been above average for much of Pennsylvania, with the bulk of the highest precipitation totals to average across the Ohio Valley where they have doubled normal rainfall over the past thirty days.  Dry weather has controlled the West and Northern Plains in that time.