October 20, 2012; 3:47PM
An unseasonable late-October warm-up is in store for much of the eastern half of the country early next week.A broad and strong area of high pressure will set up over the
mid-Atlantic, allowing for mainly sunny skies and increased surface
heating.The warmth will be aided by a rise in the jet stream, which will
settle just north of the high pressure. This will keep out cool storm
systems from Canada that would otherwise bring temperatures down.As a result, temperatures will rise significantly above average
across Chicago tomorrow through Thursday, even as a weak upper-level
disturbance crosses through Monday and Monday night.The peak of the heating will come on Wednesday when afternoon highs
climb into the middle 70s across downtown Chicago. The average high
temperature for the windy city next week is right at 60 degrees.By the end of next week, this high pressure will push off into the
Atlantic Ocean, allowing for a wetter, cooler pattern for next weekend.
This is what's called Indian Summer,which typically happens at this time of year,when,after an area receives their first freeze of the autumn,the weather warms up and you get a stretch of weather with temperatures some 10-20 degrees above normal for a time,such as this
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