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2007 Western United States freeze
The Western United States freeze of 2007 was a weather event affecting California, Oregon, and Washington from January 12 to January 18, 2007. An Arctic low pressure system dipped extremely far west, resulting in record cold temperatures in the western states, damaged citrus crops in California, and extremely unusual snow accumulation occurring in areas of Southern California.
==Buildup==
An unusually mild winter across many parts of the Southwest and Pacific Northwest paved the way for an extreme blast of Arctic air that dipped extremely far south causing Arctic snow conditions in the Pacific Northwest and unusually frigid temperatures in Southern California and the San Joaquin Valley. December brought extremely dry conditions for Southern California as well as unusually warm weather, with relatively little cloud cover in the area. Los Angeles averaged well over 3 degrees above average for the month of December. In the Pacific Northwest, the area was continually blasted with unusually large rain storms, causing flooding in much of Washington and Oregon. Temperatures began to drop below average in the San Joaquin Valley beginning January 11 and January 12 in California. The first freeze occurred in the San Joaquin Valley around midnight on January 13. During this time, the middle of the nation was being affected by a severe ice storm system caused by the tail end of the same arctic air afflicting the west.
抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』
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