Chicago Weather Forecast (O'Hare Official) 12:58 pm CDT Aug 6, 2017 with Forecast Discussion

This Afternoon: Scattered showers. Cloudy, with a high near 74. South wind around 5 mph. Chance of precipitation is 40%.

Tonight: Scattered showers, mainly before 1am. Mostly cloudy, with a low around 60. South southeast wind around 5 mph becoming calm in the evening. Chance of precipitation is 30%.

Monday: A 20 percent chance of showers before 1pm. Partly sunny, with a high near 75. North northeast wind 5 to 10 mph, with gusts as high as 15 mph.

Monday Night: Mostly clear, with a low around 58. North northeast wind 5 to 10 mph, with gusts as high as 15 mph.

Tuesday: Sunny, with a high near 81. West northwest wind around 5 mph.

Tuesday Night: Partly cloudy, with a low around 62.

Wednesday: Mostly sunny, with a high near 81.

Wednesday Night: Partly cloudy, with a low around 63.

Thursday: Mostly sunny, with a high near 81.

Thursday Night: Partly cloudy, with a low around 64.

Friday: Mostly sunny, with a high near 82.

Friday Night: A slight chance of showers. Partly cloudy, with a low around 64.

Saturday: A chance of showers and thunderstorms. Partly sunny, with a high near 81.

National Weather Service Chicago/Romeoville, IL
642 AM CDT Sun Aug 6 2017

313 AM CDT

Through Monday...

Several features of interest on satellite early this morning to act as triggers for showers, but it may be that coverage of precipitation today may be a bit less.

There is a fairly stout upper disturbance across the Dakotas that will rotate southeastward today, with several MCS complexes across the southern plains and the Ozarks. It does not seem based on the current fgen axis and warm air advection wing will really shift strongly north, and it is being held up a bit by the convection. There are hints that some higher based WAA/FGEN in conjunction with the northern stream wave will allow for scattered showers to develop as early as mid morning, and there have even been a few decaying radar echoes from this early this morning. Satellite and forecasted RH progs suggest anything in the near term would be minimal. The RAP and other short term convective allowing models are less aggressive then the global guidance in the northward WAA influence. There are still signals with the elevated WAA axis and shortwave troughing that at least a scattered showers will be around at times. Thunder chances still appear low.

With the upper jet in the region the surface low associated with the southern plains activity may invigorate lift and also strengthen the associated surface low as it will move northeast through the Ohio valley, but both the NAM and now the 0z EC have latched onto the more southern low track that would also keep the bulk of the precipitation south and east of the area. Will hang onto a chance rain mention this evening, then lower chances Monday as the trough axis slides through coupled with a weak cold front.


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