All Weather News

Major Cool-Down to Take Over the Western U.S.

20 Sep 2017, 4:00 pm

Just in time for the first weekend of Fall, a major cool-down will bring perfect conditions for scarves and pumpkin spice lattes.

Temperatures will swing from more than 10 degrees above normal to more than 20 degrees below normal in a matter of just a few days.

It Starts Up High in the Atmosphere

The jet stream, or steering winds, high up in the atmosphere have already been showing signs of a seasonal change. Large ridges and troughs (ups and downs) have been responsible for the drastic temperature differences in various parts of the U.S. This is very typical come this time of year and often the culprit for those cold-snaps.

The jet stream is going to dip deep across the western states in the coming days, opening the door for another round of pre-winter arctic air to spill in.

Ground Level

On the ground, this means a very potent cold front will bring those cooler temperatures just in time for the start of Fall.

Will it Last?

Short answer, no.

But you might want to keep out some of the cold-weather gear through the middle part of next week!

Here are a few 7-day forecasts showing the below-average temperatures  will linger through the first couple days of the work week.

Next Week is Not Looking too Good Either

For WeatherNation — Meteorologist Jeremy LaGoo

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