MORNING PREVIEW: Weather, Traffic Thursday, November 4, 2021

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

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 O’HARE FORECAST … 

Today: Cloudy, then gradually becoming mostly sunny, with a high near 43. Light west wind becoming southwest 5 to 10 mph in the afternoon.

Tonight: Mostly clear, with a low around 33. South southwest wind around 5 mph.

Friday: Sunny, with a high near 51. South southwest wind 5 to 15 mph.

An area of stratus over Iowa has been spreading into northern Illinois early this morning. The stratus is the result of low level warm air advection, noted as some modest isentropic ascent (warm air lift above colder air) on the 280K and 285K surface. This isentropic ascent is forecast to weaken some later this afternoon, but probably not before an extensive stratus deck overspreads most of our CWA this morning. Model guidance indicates that the stratus is pretty thin, so given the presence of dry sub-cloud layer air, the precipitation threat appears low. There have been some weak echos showing up on radar over Iowa, but no surface observation of any precipitation. Radar is probably picking up on some virga.

While precipitation threat looks low, the stratus will have an impact on today’s temperatures. Northern portions of Chicagoland look to stay fairly cloudy through much of the day which should limit temp rise. The NWS Chicago office has scaled back the high temperature forecast a couple/few degrees this afternoon, mainly north of I-80. Stratus should clear out from southwest to northeast late this afternoon/early this evening. Mostly sunny skies and warm air advection should allow for a healthy jump in temperatures tomorrow with highs near or just above 50°F across Chicagoland.

FROST

Very light frost.

Weather Radar in northeast Illinois was clear at 8:00 a.m.

Arlingtoncardinal.com/clouds | Arlingtoncardinal.com/temps

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WEATHER OBSERVATIONS

NWS CHICAGO

Arlington Heights Weather

TRAFFIC

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Northwest Suburbs
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Chicagoland
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lakecountypassage.com

McHenry County
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DuPage County
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Kane County
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Will County
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Flights

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