Hot temperatures have dominated parts of the Midwest, Plains and East during the first week of September, with highs topping out well into the 80s and 90s at times. While some might be enjoying this late-summer heat and humidity, others are probably ready for the air to have more of a fall feel east of the Rockies. For those in the latter camp, we do have some good news on the horizon thanks to a rearrangement of the jet stream pattern.
The jet stream is a ribbon of fast winds aloft in the upper atmosphere that helps dictate the weather conditions we see near the surface of the earth. Given that the fall equinox is just over two weeks away, we know that weather conditions are becoming much more changeable as the jet stream strengthens and amplifies, resulting in more movement north and south.
Since early last week, the jet stream has been well to the north in central and eastern Canada, resulting in the widespread above-average warmth we've been seeing lately in the Midwest, Plains and East. During this coming week, the jet stream pattern will flip.
For the Midwest and parts of the East, the jet stream will dip south, allowing temperatures to drop to near-average or even below-average levels as the week progresses. In fact, some cities in the Midwest may see high temperatures drop 20 degrees or more from Sunday into late this week.
The jet stream is a ribbon of fast winds aloft in the upper atmosphere that helps dictate the weather conditions we see near the surface of the earth. Given that the fall equinox is just over two weeks away, we know that weather conditions are becoming much more changeable as the jet stream strengthens and amplifies, resulting in more movement north and south.
Since early last week, the jet stream has been well to the north in central and eastern Canada, resulting in the widespread above-average warmth we've been seeing lately in the Midwest, Plains and East. During this coming week, the jet stream pattern will flip.
For the Midwest and parts of the East, the jet stream will dip south, allowing temperatures to drop to near-average or even below-average levels as the week progresses. In fact, some cities in the Midwest may see high temperatures drop 20 degrees or more from Sunday into late this week.
Story from: http://www.wunderground.com/news/pattern-change-september-cooler-midwest-east-south
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