MORNING PREVIEW: Weather, Traffic Friday, October 22, 2021

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


Today: Mostly sunny through mid morning, then becoming cloudy, with a high near 55. Northwest wind around 5 mph.

Tonight: Partly cloudy, with a low around 40. North northwest wind around 5 mph becoming calm in the evening. BE ALERT for FROST in Arlington Heights or north and west of Arlington Heights.

Saturday: Sunny, with a high near 56. Calm wind becoming north northwest around 5 mph. Winds could gust as high as 10 mph.

There are no major weather concerns through the next 36 hours outside of frost tonight across north-central Illinois.

Currently, a sprawling upper-level low pressure system is centered on the southern tip of Hudson Bay with several short-wavelength troughs are embedded within. One such wave is in northern New York, with another in northwestern North Dakota. Our area is in a stagnant zone in between the upper-level waves, which is allowing a pesky low-level stratus deck to remain parked over areas from I-88 south. With little to no wind to advect dry air (or the clouds themselves) through the next 12 hours or so, the clouds should remain in place. So, areas north of I-88 will be greeted by sun and perhaps a few pockets of fog this morning, while areas to the south will wake up to gloomy skies. As the aforementioned upper-level wave currently in North Dakota approaches this afternoon, clouds will spread over the entire area. Highs will accordingly have limited time to warm, with the low to mid 50s expected areawide. Most area should stay dry today, with areas southeast of I-55 having the best chance for a few sprinkles from time to time (shouldn`t be a washout).

Tonight, clouds should gradually clear from northwest to southeast and winds will stagnate as a surface pressure col slides over the western Great Lakes. Confidence is reasonably high that that overnight lows will drop into the low to mid 30s across most of our area with the coldest temperatures across north-central Illinois. Frost appears all but probable northwest of a line from Mendota to Aurora to Antioch, and especially at around the Rockford Area. — NWS Chicago.


Light dew on grass and vehicles in Arlington Heights.


Weather Radar in northeast Illinois was clear at 6:35 a.m. |




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