O’HARE FORECAST …
Today: Mostly cloudy, with a high near 39. West wind 10 to 15 mph, with gusts as high as 20 mph.
Tonight: Rain and snow likely, mainly after 3am. Cloudy, with a low around 33. South southwest wind 10 to 15 mph, with gusts as high as 25 mph. Chance of precipitation is 70%. New snow accumulation of less than a half inch possible.
Sunday: Rain and snow likely before noon, then a chance of rain and snow showers between noon and 5pm, then a chance of snow showers after 5pm. Cloudy, with a high near 40. Breezy, with a south southwest wind 15 to 20 mph becoming northwest in the afternoon. Winds could gust as high as 30 mph. Chance of precipitation is 60%. New snow accumulation of less than a half inch possible.
Sunday Night: Partly cloudy, with a low around 26. Northwest wind 10 to 15 mph, with gusts as high as 30 mph.
According to the NWS Chicago office, the primary forecast concern in the short term is the arrival of another winter system late Saturday night into Sunday, bringing snow chances and strong winds to the area.
Aside from a few light flurries/drizzle across the metro, all is quiet in the immediate near term after a busy day Friday featuring snow showers and squalls. Surface temperatures have been holding fairly steady in the mid-30s in most areas overnight. The closed upper low will continue its gradual departure to the northeast today. A stray flurry/sprinkle is possible Saturday morning, but overall the mid-levels look too dry for any formal forecast precipitation mention through the daylight hours. The high today will only top out in the upper 30s to around 40.
0.4 inch of slushy snow possible early Sunday in Arlington Heights
On the heels of the upper low, a clipper system will dig across the Northern Plains, reaching the area overnight into Sunday morning. In advance of the surface low, model guidance develops an axis of warm advective precipitation across central Illinois into our southern zones tonight. It may take some time for precipitation to reach the surface, with some dry air noted in the mid-levels that will take time to saturate. Another region of precipitation will be tied closer to the center of the surface low moving across southern Wisconsin. By Sunday morning, precipitation will expand in coverage across much of the area, with rain/snow/drizzle mix possible at times. Soundings trend a bit more convective by Sunday afternoon, suggesting additional rain/snow showers will be possible before the system departs to our east. Minor slushy accumulations less than an inch are expected thanks to above freezing surface temperatures, with the exception being areas along the IL/WI border which could see closer to an inch as well as over in northern Porter county where lake effect snow will persist into Sunday evening.
In addition to the precipitation potential, winds are expected to be gusty out of the northwest up to 30-40 mph Sunday afternoon with a tightening pressure gradient, and strong low-level jet winds mixing down to the surface. This will result in building waves along the northwest Indiana shore Sunday afternoon and evening, which could result in lakeshore flooding potential, especially along the Porter County shore.
Grass damp from precipitation. Vehicle metal and glass dry. Dew point depression 4°F to 5°F, gusty winds, and mostly cloudy conditions overnight.
Weather Radar shows light precipitation (might be virga in your area) moving from northwest to southeast at 6:20 a.m.
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