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Coolest Weather Since May ... Here to Stay?

Josh Larson @ 11:00 PM

For the next 36 to 48 hours, we'll hold onto the coolest weather we've seen since late May. But this weekend we'll see a quick warm-up (and increase in cloud cover), with temperatures rebounding into the 80s. By Monday, however, another cold front will barrel through, dropping temperatures back to somewhat below normal levels again for the remainder of the week.


Spectacular! After a crisp start to the day -- with temperatures in the mid 40s across the coolest suburbs to the low 50s downtown -- we'll see temperatures quickly rise into the 60s by late morning. Expect abundant sunshine for the afternoon, with lighter winds than yesterday, and a high near 70. Clear and quite cool once again tonight, with lows again in the 40s and 50s.


Forecast Confidence: Medium-HighStill delightful. After another cool start Friday morning, expect plenty of sunshine throughout the day with slightly milder highs approaching 75 in the afternoon. Partly cloudy and not nearly as chilly Friday night, with lows ranging from the mid 50s to lower 60s.

The Weekend

Forecast Confidence: Medium-HighNot too bad. The flow aloft from the northwest, chiefly responsible for the cool readings yesterday and today, will quickly switch around to the southwest, which will allow for warmer temperatures as well as increase cloud cover and precipitation chances for the weekend.

Expect more clouds than sun on Saturday, though there will still be peaks of sunshine, a slight chance of a stray shower, and a high near 82. A stray shower may linger Saturday night, with mild overnight lows in the mid 60s. On Sunday, expect mostly cloudy skies with a 40% chance of showers and thunderstorms, especially during the second half of the day, as a result of an approaching cold front; much of the day, however, will be dry. Highs will likely reach 83, with cooler overnight lows near 60.


Pattern Overview
Notwithstanding the brief warm-up we'll experience this weekend, our forecast for the next 10 days looks decidedly autumnal, befitting the official start of fall -- this weekend. We have a trough over the Northeast at the moment, and it appears that by Monday another cold front (and associated trough) will push into the Great Lakes/Northeast. A look at the PNA and NAO, which may be having a subtle impact on our current pattern, suggests that slightly cooler than normal conditions may likely persist through the remainder of next week.

Above: the GFS' depiction of another shot of cool air pushing from central Canada to the East Coast by Monday; courtesy Unisys.

Next week's forecast
Forecast highs/lows: 73/53 (normal = 76/58)
Forecast precip: Below-normal

Forecast Confidence: Medium-HighExpect skies becoming mostly sunny on Monday with much cooler temperatures once again: highs will be near 70 with overnight low from the mid 40s to low 50s. Tuesday and Wednesday look to feature abundant sunshine with highs from 68-73 and overnight lows from the upper 40s to mid 50s. A weak frontal system may increase cloud cover as well as chances for precipitation on Thursday, but temperatures will remain rather steady. Sunshine should return on Friday, with highs in the mid 70s and lows from 50-55.

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