As October ends and the month of November begins, there will be a very active and stormy weather pattern over the first part of the forecast period.
This will be because of a jet stream over the region, heading from the Pacific Northwest into the southern plains.
Expect a changeable, back-and-forth temperature pattern with cool-downs behind a series of fronts followed by warm-ups out in advance of the next cold front.
There should not be any arctic blasts because the air masses moving into the Lower 48 states will be coming from the Pacific Ocean rather than the Arctic or Siberia.
Even though this is the case, there will be quite a few chances for mountain snow to continue to build up the snowpack, since it is late enough in the season not to need true arctic air for snow to fall.
As time progresses, a strong ridge of high pressure will flex its muscles over the Pacific Northwest and will cause storms to take a more southerly track, meaning the stormy pattern will likely slacken off, especially across northern regions.
Places to the south of Denver may stay rather active through the next 30 days or so.
Even late in the period, there are no signs of true arctic air being able to head south.
