Wednesday will begin with areas of valley fog in the Northeast, but abundant sunshine later in the day will boost afternoon temperatures above the seasonal average.
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The cooled air at the ground is dense and drains into low spots in the terrain, making valleys fog-prone while nearby hilltops can often remain in the clear.
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Widespread valley fog will be common in the Pacific Northwest and Idaho as cool, moist air remains trapped by sinking air currents associated with strong high pressure over the region.
