It's rained every weekend for nearly two months in the Northeast. Here's what's causing it and when it might end

Prepare for another dose of wet weekend weather in the Northeast, but this time, the dreary déjà vu comes with a twist - some snowflakes may fly in high elevations.

It has rained on a Saturday or Sunday in parts of the Northeast and mid-Atlantic every weekend since late August. Other locations have managed to stay dry for a weekend here and there, but have endured mostly dreary conditions for almost two full months.

In Philadelphia and New York City, this weekend is shaping up to be the seventh consecutive wet weekend, and the eighth wet weekend since late August.

It's not just been miserable. Wet weekend weather has also put a damper on vital fall foliage tourism in New England.

Why is the Northeast stuck in this seemingly-never-ending loop? Meteorologists say to blame the upper atmosphere, where a stubborn weather pattern has opened the door for storms to cross the region.

"We have these overall patterns that generally last roughly six to eight weeks with storm systems coming through every six to eight days," Sarah Johnson, meteorologist for the National Weather Service in Mount Holly, New Jersey, told CNN.

These storms are progressive in nature, which means they track across the country at a consistent pace without slowing down significantly or stalling.