MORNING PREVIEW: Weather, Traffic Saturday, October 30, 2021

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NWS FORECAST: KORD | KPWK | Forecast Graph O’Hare

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 O’HARE FORECAST … 

Today: Areas of drizzle with scattered showers before 11am. Mostly cloudy, with a high near 55. North northeast wind 10 to 15 mph, with gusts as high as 20 mph. Chance of precipitation is 30%.

Tonight: Partly cloudy, with a low around 43. West wind around 5 mph.

Sunday: Mostly sunny, with a high near 54. Northwest wind 10 to 15 mph, with gusts as high as 25 mph.




According to the National Weather Service Chicago, we are on Day 3 of the large upper-low affecting the area. The influence of the upper low will wane through the day. The low has devolved into several waves rotating around each other across the central Appalachians into the upper Ohio Valley. A trough axis extending northwest into lower Michigan from a distinct vort lobe over western Ohio will shift southwest across the area through daybreak. A stout ridge extending around the northwest flank of the low will then quickly build into the area, crossing Chicagoland in a weakening phase tonight.

An extensive area of light rain and drizzle roughly along and east of I-57 early this morning will gradually shift south with the passing wave which was forecast through daybreak. With large scale lift quickly diminishing after daybreak as mid-level moisture departs and a strong subsidence inversion develops and lowers to under 4000 feet, precipitation coverage will rapidly diminish through the morning hours. Any lingering light showers or patches of drizzle should remain confined to east of I-355/55 into northwest Indiana after daybreak and into early afternoon, where lake-modified profiles support a deeper saturated layer and a slightly less stable probable sufficient for some precipitation generation. With that said, coverage and intensity will be low with any remaining precipitation.




Low cloud-cover will be prevalent through at least the morning, but breaks in current upstream clouds and gradual dry air advection from the north should allow for a general clearing trend from north to south this afternoon and evening.

The flattening ridge will shift well east of Chicagoland by Sunday afternoon as the next longwave trough over the Canadian Prairies moves into the Upper Mississippi Valley. An associated cold front will push across the area Sunday morning. The northwest Canadian origin of the wave and low-level airmass combined with little time for moisture return into the area should yield a dry frontal passage with some scattered post-frontal cumulus before much drier air ushers in generally clear skies for the evening. — NWS Chicago with CARDINAL NEWS edits

DEW

Moisture from drizzle overnight.

Weather Radar showed very light if any precipitation hitting the ground moving northeast to southwest in northeast Illinois at 9:00 a.m.

Arlingtoncardinal.com/clouds | Arlingtoncardinal.com/temps

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Much of the weather information in this article consists of material from the National Weather Service, which is in the public domain. As required by 17 U.S.C. § 403, third parties producing copyrighted works consisting predominantly of the material appearing in NWS Web pages must provide notice with such work(s) identifying the NWS material incorporated and stating that such material is not subject to copyright protection.

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