It’s still August, but up to 10 inches of snow could fall in the Northern Rockies through Tuesday. Snow at this time of year in the high elevations of the Mountain West is not unusual but, along with the waning hours of daylight, is a stark reminder that fall and winter are closing in.

Winter weather advisories are posted in Wyoming’s Teton and Bighorn mountain ranges as well as the area around Yellowstone National Park. In Montana, the West Glacier Region and the northern and southern Rocky Mountain front are under advisories.

Weather.com reported that these were the first winter weather advisories posted in the Lower 48 since June.

The advisories mostly affect regions above 6,000 feet in elevation, and the heaviest snow, exceeding four inches, is expected above 9,000 feet.

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At the lower elevations, it’s unseasonably cold, windy and rainy. The National Weather Service was predicting the lowest high temperature on record for Aug. 27 around Billings, Mont. — only in the upper 50s.

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The wintry conditions were brought on by a strong cold front and dip in the jet stream. The front was welcomed by many, helping to clear out the persistently smoky conditions from the wildfires in the western United States and western Canada.

But on the flip side of this jet stream trough, a heat dome is bulging to the northeast into New England, where 56 million people are under a heat advisory.

If you’re reading from the eastern half of the nation, where it’s sweltering, here are pictures of this early season snowfall to help cool you off. …

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