61.   Sometimes in a La Nina regime, the course of the jet stream temporarily flattens out and whisks warm Pacific air all the way across the continent.

62.   Streamers of cirrus clouds will streak the sky over parts of the Rockies as moist Pacific air flows over the mountains.

63.   Sunday, much cooler Pacific air will arrive in northwest Washington, accompanied by spotty drizzle.

64.   The advance of Pacific air into the central and northern Rockies will be marked by clouds along with valley showers and mountain snows.

65.   The arctic air mass that has tenaciously gripped the northern Plains this week will begin to slightly loosen its grip as Pacific air streams eastward.

66.   The boundary between cool Pacific air across the northern half of the nation and record warm tropical air over the South will stretch from New Jersey to Kansas.

67.   The mild Pacific air brought inland by these fronts will spread across the nation, bringing an extended break from arctic chill in the East.

68.   The northern Plains will turn milder this weekend as Pacific air warms on its eastward descent from the Rockies.

69.   The Northwest will be unsettled as a moist flow of Pacific air persists.

70.   The persistent flow of tropical Pacific air into the West Coast will ease Friday, allowing the heavy precipitation to taper to showers.