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Storm Impacting the Northwest U.S.; Fire Weather Conditions in Southern California; Severe Weather in the South

A Pacific storm is bringing areas of low elevation rain, moderate to heavy mountain snow, and high winds to the Northwest. Strong Santa Ana winds and very dry conditions are producing elevated to critical fire weather conditions in southern California. Isolated strong to severe thunderstorms are possible through early Wednesday morning across parts of northeast Texas into western Tennessee. Read More >

Overview

Dense freezing fog formed across the Sioux Falls area during the early morning hours on December 11, 2004. Temperatures were in the lower 20s, with visibilities in the freezing fog down to 1/4 to 1/2 mile at times. There was a relatively light south wind - less than 10 mph when visibilities were at their lowest - but it was enough to cause the frost to develop primarily on the windward side of objects (i.e. on the south facing side).


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