81.   Tranquil conditions will cover much of the nation, from the Mississippi Valley to the East Coast, as a large high-pressure system builds across the Ohio Valley.

82.   To the south of the disturbance, mainly sunny and rather warm conditions will cover the southern parts of the Plains and Mississippi valley.

83.   Unseasonably cool conditions will cover much of the West as several disturbances slide south from western Canada.

84.   Very warm and humid conditions will cover most of the central and southern Plains where moist winds from the south will prevail.

85.   Unseasonably cold air will continue to move through the East while mainly mild, tranquil conditions cover the West.

86.   Very warm and humid conditions will cover most areas from the central and southern Plains to the Atlantic Seaboard this weekend.

87.   Windy conditions will cover California amid partly sunny skies.