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Reporting
They are probably talking They are probably talking about the elevations upwind from you. The winds from the northwest would hit the higher lands in the "fingers" of the mittens and rain or snow out -- leaving no moisture for the "thumb" downwind.

2015 Special Edition Garden GuideCooking Fresh with The Old Farmer's AlmanacThe Almanac Monthly Digital MagazineWhat the heck is a Garden Hod?