81.   Farther north, clouds and areas of light snow will occur near a front marking the boundary between relative mild air and the Arctic air covering most of Canada.

82.   For arctic air to have full impact on the peninsula of Florida, it must be a landlubber.

83.   For the past several days, fast, west-to-east jet stream winds have impeded the southward advance of Arctic air.

84.   Frequent incursions of arctic air made March one of three coldest on record in several spots around the state.

85.   Frigid arctic air will remain locked in central and northern Canada for the next several days as a vigorous jet stream delivers Pacific air across the nation.

86.   Frigid conditions will cover the northern Plains and upper Middle West as Arctic air circulates southward.

87.   Frigid masses of Arctic air still rule the polar winter, and a southward bulge of this polar chill was a crucial element in producing the blizzard.

88.   Given recurrent snowstorms and the tenacity of arctic air over the northern Plains so far this winter, a relatively deep snowpack has become well established over the Dakotas.

89.   Heavy snow is possible on high ground across northwest Pennsylvania and southwest New York, where moistened Arctic air is forced to rapidly ascend the sloping terrain.

90.   High winds will combine with arctic air to create potentially dangerous conditions.