Chicago Weather Forecast (O'Hare Official) 4:18 am CDT Sep 11, 2017 with Forecast Discussion

Today: Sunny, with a high near 74. Light southeast wind becoming east 5 to 10 mph in the afternoon.

Tonight: Mostly clear, with a low around 55. East northeast wind around 5 mph.

Tuesday: Mostly sunny, with a high near 76. East northeast wind 5 to 10 mph.

Tuesday Night: Partly cloudy, with a low around 59. Northeast wind 5 to 10 mph.

Wednesday: A 20 percent chance of showers. Partly sunny, with a high near 73. East wind around 5 mph.

Wednesday Night: Mostly cloudy, with a low around 60.

Thursday: Mostly sunny, with a high near 76.

Thursday Night: Mostly clear, with a low around 59.

Friday: Sunny, with a high near 79.

Friday Night: Mostly clear, with a low around 62.

Saturday: Sunny, with a high near 82.

Saturday Night: A slight chance of showers and thunderstorms. Partly cloudy, with a low around 63.

Sunday: A slight chance of showers and thunderstorms. Mostly sunny, with a high near 80.

Amf Ohare IL
 41.98°N 87.9°W

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National Weather Service Chicago/Romeoville, IL
GO Current Forecast Discussion


253 AM CDT Mon Sep 11 2017


Through tonight...

No significant weather expected.

- Izzi



Tuesday through Sunday...

Only real weather potential weather of note in the longer term period is with remnants of Irma.

Upper level ridging over the Great Lakes early this week will hel Pdeflect the remnants of Irma westward as it gain latitude. The result looks to be Irma`s leftovers potentially getting close enough to our area to bring some rain showers and certainly a marked increase in cloud cover. High cloudiness from Irma will spread in from the southeast Tuesday with shower chances slowly creeping in from the southeast as well by Tuesday night and particularly Wednesday. Irma and associated forcing will be weakening as it approaches and our area is forecast to be on the northwest flank of the system, so rainfall amounts at this point look like they`ll be pretty light and may not amount to anything northwest half of the CWA.

Irma`s remnants is progged to get picked up by the westerlies later Wednesday, exiting our region stage right Wednesday night. In its wake, medium range guidance suggests a transition toward a western trough/eastern ridge pattern late in the week which would result in a warm up to above average temps by next weekend. Weak cold front looks to move through later Sunday or Monday, which an associated risk for some rain and eventually cooler temps in its wake.

- Izzi


.AVIATION... For the 06Z TAFs...

Clear skies will make way for increasing cirrus from the southeast through the afternoon and evening. High pressure over the eastern Great Lakes will slowly drift a bit farther east today, which will still support an east wind though a tad lighter than in past days. KMD



High pressure over the eastern Great Lakes will shift to the New England coast by Tuesday, though the associated ridge axis will linger over the Lake Michigan for a good portion of the week. There is a cold front across Ontario, but Lake Michigan will remain on its warm side through the week. This will result in south-southwest wind of 15-25 kt across the north half of the lake today. Otherwise, conditions will be fairly quiet until possibly next weekend as another front will approach from the west and south winds will increase across the entire lake.




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