Unseasonably Cool Weather Expected This Week

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TOPEKA, Kan. WIBW Expert Forecasters say the United States could see some extreme weather next week - thanks to "a giant trough in the jet stream" expected to dip down from Canada, according to CBS Boston chief meteorologist Eric Fisher.

It's expected to happen starting Sunday in the Upper Midwest, then keep digging into Tuesday across the central and eastern portions of the nation.

What would that mean?

Very cool air for July taking over the middle and eastern U.S. with 60s and 70s for highs, lots of 40s and maybe even some 30s for lows near the Canada border.

And a lot of stormy weather - possibly severe - Monday and Tuesday in particular, with a heavy rain threat for the East that may pan out Tuesday and Wednesday with a flash flood risk.

"This is a pattern very similar to what we saw all winter," Fisher said. "It really hasn't gone anywhere since then - just a few interruptions here and there, but it keeps re-establishing itself."

The National Weather Service's Storm Prediction Center says, "A substantial severe risk may develop across the Northeast Megalopolis on Tuesday. Over 60 million people (could have) at least a 30 percent probability of severe storms."

The West could see the opposite - higher-than-usual temperatures, especially in the Pacific Northwest, Fisher said.


What would that mean for us (NE Kansas)?

This "trough or dip in the jet stream" will begin to affect us on Monday night into Tuesday where temperatures will steeply drop off into the 50's and we will warm up only into the Lower 70s, for what is typically the warmest week of the entire year! We will not begin to warm into the 80's until possibly Friday. This bids as fantastic news for Fiesta Mexicana with early spring-like temperatures and clear skies!

This even has been nicknamed the "Polar Vortex", however this is not Meteorologically Accurate it is on a smaller scale than THE Polar Vortex-which is on a Planetary scale, or what we call a 'synoptic scale', albeit it is still a large trough and the nickname has gained so much popularity following a similar event this previous winter over the same region. In reality the cause of the big cool down is due to a pattern change in the jet stream that was caused by the typhoon in Japan.

The image of this "dip in the jet stream" is shown in the pictures above the trough is where we see the cooler temperatures drop down into the central plains. Below this dip is where the warmer temperatures will be held for the duration of the trough's movement-this is fantastic news for us!

Make plans for next week!