You often hear us refer to the "snow field" in winter. It is something that we have to watch because it can affect our temperature forecasts, Northerly winds blowing across a vast snow covered ground can send a chill deeper into the southern USA than when snow cover is sparse.
After the last storm, the snow field has encroached southward to a line running from Northern Arizona and new Mexico to Kansas...Northern Missouri...across the middle part of Illinois and Indiana to New York and New England. Satellite photographs and surface reports show that the snow cover is continuious from that line northward through all of Canada and Alaska and far, far over the North Pole.
This allows the atmosphere to get colder and colder and eventually the arctic air gets restless and heads south. Brrrrr!!!
After the last storm, the snow field has encroached southward to a line running from Northern Arizona and new Mexico to Kansas...Northern Missouri...across the middle part of Illinois and Indiana to New York and New England. Satellite photographs and surface reports show that the snow cover is continuious from that line northward through all of Canada and Alaska and far, far over the North Pole.
This allows the atmosphere to get colder and colder and eventually the arctic air gets restless and heads south. Brrrrr!!!