As temperatures generally head down across the nation this week, the Southwest will buck the trend and continue warming up.
The 90s and 100s that were felt in some areas this weekend will be commonplace early this week across many areas, most notably in California where the warmth will be nearly unprecedented for this time of the year.
In Fresno, it was the hottest start to October in 25 years.
Unusually strong high pressure centered over the Great Basin will reinforce the offshore flow that has been driving the southwestern warmth over the past several weeks.
Since the beginning of September, cities like San Diego, Los Angeles and Las Vegas have averaged several degrees above normal.
Through Tuesday, afternoon temperatures in those same locations could run as high as 15 degrees above normal. This will be more than enough to challenge some long-standing records.
In Sacramento and Fresno, record-high temperatures in the low 100s will be in jeopardy of falling early this week.
Even normally cooler San Francisco, which typically enjoys most days in the lower 70s this time of year, will take a run at the mid-80s again on Monday, which would rank it among the warmest days this year. Temperatures reached 87 degrees on June 16.
Typically hotter parts of Greater L.A., including Burbank and the Inland Empire, will reach triple digits. Even residents and visitors to the Pacific Coast will need to break out the shorts.
This unusual warmth has been well advertised here at AccuWeather.com.
AccuWeather.com Western Expert Ken Clark warned on his blog last week that excessive heat was on its way. Clark also warned about the potential effects of the heat on health.
"It is not advisable for anyone to overexert themselves from the middle morning hours into the early evening when it is the hottest," says Clark.
Both Clark and AccuWeather.com Meteorologist Anthony Sagliani added that very dry air would increase the fire threat.
"Relative humidity levels will plummet to less than 10 percent in many locations," said Sagliani. "With most of the region abnormally dry, a mere spark could ignite a fire; throw in gusty afternoon and evening winds, and an explosive fire threat will be present."
Though the record-challenging heat will be confined to early this week, the unseasonably warm air will persist through midweek before more-seasonable temperatures take hold this weekend.
A blast of chilly air from western Canada will focus toward the northern Plains and not the interior West during the middle of the week.
The first widespread ice storm of the season will slowly diminish over parts of the southern and central Plains, but areas of slippery travel will continue into Sunday morning.
After another brief shot of chilly air over the weekend, the month of December will start out milder across the Northeast.
The reprieve from heavy rain across southern India will not last with the threat for flooding downpours set to return for the final days of November.
December will begin with a roar across the Northwest as rounds of rain, mountain snow and even ice are in store into late week.
The strongest El Nino in 50 years will unfold this winter and significantly alter the chances for a white Christmas across the country.
As millions head home from their Thanksgiving ventures the weather may cause trouble on the roads and at the airports from the southern Appalachians to the central Rockies on Sunday.
Havre, MT (1896)
Minus 51 degrees.
New England (1945)
Severe "nor'easter" in New England - winds in Boston averaged 40.5 mph over a 24-hour period. The rain changed to snow which accumulated to 16 inches in interior New England. Thirty-tree deaths were attributed to the storm.
November 1972 was one of the wettest on record for the Northeastern U.S. As of the 27th, NYC had its wettest November ever with 11.36 inches. This broke the old record of 9.97 inches. Binghamton, NY, had a monthly total of 7.11 inches -- the wettest November in the 75-year history of record keeping at Broome County Airport. Binghamton also had 19.4 inches of snow -- exactly a foot above normal.