Chicago Weather Forecast (O'Hare Official) 1:25 pm CDT Sep 5, 2017 with Forecast Discussion

This Afternoon: A 20 percent chance of showers or light rain after 3pm. Mostly sunny, with a high near 69. Northwest wind around 15 mph, with gusts as high as 20 mph.

Tonight: Mostly cloudy, with a low around 49. Northwest wind around 10 mph, with gusts as high as 15 mph.

Wednesday: A 30 percent chance of showers after 1pm. Partly sunny, with a high near 66. North northwest wind around 10 mph, with gusts as high as 15 mph.

Wednesday Night: Mostly cloudy, with a low around 50. West northwest wind 5 to 10 mph.

Thursday: Partly sunny, with a high near 68. West northwest wind 5 to 10 mph.

Thursday Night: Partly cloudy, with a low around 51.

Friday: Sunny, with a high near 71.

Friday Night: Mostly clear, with a low around 53.

Saturday: Sunny, with a high near 71.

Saturday Night: Mostly clear, with a low around 51.

Sunday: Sunny, with a high near 72.

Sunday Night: Mostly clear, with a low around 54.

Monday: Sunny, with a high near 75.

 Amf Ohare IL  41.98°N 87.9°W

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


556 AM CDT Tue Sep 5 2017


Through Wednesday Night...

Colder air is filtering into the area this morning in the wake of yesterday`s cold front. Look for much cooler temps today with morning sunshine giving way to bubbling cumulus field this afternoon with a couple light showers or sprinkles possible late as weak shortwave trough pivoting around the sharp trough rotates south toward the area. Fairly low equilibrium levels and limited moisture should keep shower coverage and intensity minimal.

Any afternoon showers will quickly fade this evening with the loss of daytime heating. Can`t rule out a couple more light instability showers or sprinkles Wednesday afternoon, but the prospects for measurable precip look pretty bleak. Otherwise, it does appear as though plume of lake effect showers and perhaps some isolated thunderstorms could make it as far west as Porter County at times late tonight through Wednesday night.

- Izzi



Thursday through Monday...

Quiet weather expected in the long term as trough moves east and heights begin to rise. Current indications are that we will enter an extended stretch of dry conditions as upper ridging develops over the area. Temperatures will gradually moderate through the period, likely rebounding back to near normal over the weekend.

- Izzi


.AVIATION... For the 12Z TAFs...

Overall quiet weather is expected across the area through the period. Expect prevailing west-northwesterly flow though much of the period as a large area of high pressure gradually builds southward over the Plains today. Expect wind speeds to become a bit more gusty up to around 20 KT during the day. VFR conditions are expected, with only a deck of Strato-Cu expected to develo Paround 5,000 feet this afternoon. A few isolated to widely scattered light showers are also possible across the area this afternoon, but impacts should be very low. Additional showers will be possible across the area on Wednesday.




Stiff north to northwesterly winds are expected to continue over most of the lake through at least Wednesday night as a large area of surface high pressure sets up over the Plains states. Initially there have been some reports of low end gale force winds with the onset of these northwest winds. These high wind speeds should be short lived, and will gradually settle into the 15 to 25 kt range this morning.

There will also be a threat of some lake effect showers/thunderstorms though early Thursday as lake induced instability increases with the cool autumn airmass shifting over the lakes. Waterspouts will also be a good possibility, especially tonight into Wednesday as a more focused area of lake effect showers/storms look to set up over central and southern portions of the lake. Wind speeds could also become locally higher near these showers/storms.

Because of these persistent northerly winds down the lake, expect waves in the 4 to 6 ft range to continue through Wednesday, especially over southern Lake Michigan. Therefore, small craft advisory conditions are likely to continue through at least Wednesday evening along the Indiana near shore waters.



.LOT WATCHES/WARNINGS/ADVISORIES... IL...None. IN...Beach Hazards Statement...INZ001-INZ002 until 10 PM Wednesday.

LM...Small Craft Advisory...IN nearshore waters until 10 PM      Wednesday.

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Arlington Heights Weather Forecast
Chicago allergy weather
Chicago arthritis weather
Chicago respiratory weather

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Hazardous Weather Outlook National Weather Service Chicago/Romeoville IL 416 AM CDT Tue Sep 5 2017

ILZ003>006-008-010>014-019>023-032-033-039-INZ001-002-010-011-019- 060930- Winnebago-Boone-McHenry-Lake Illinois-Ogle-Lee-De Kalb-Kane- DuPage-Cook-La Salle-Kendall-Grundy-Will-Kankakee-Livingston- Iroquois-Ford-Lake Indiana-Porter-Newton-Jasper-Benton- 416 AM CDT Tue Sep 5 2017 /516 AM EDT Tue Sep 5 2017/


.DAY ONE...Today and Tonight.


  High Swim Risk Indiana Lake Michigan beaches.

.DAYS TWO THROUGH SEVEN...Wednesday through Monday.

Wednesday...   High Swim Risk Indiana Lake Michigan beaches.


Spotter activation will not be necessary through tonight.