O’HARE FORECAST …
Today: Sunny, with a high near 43. South wind 5 to 10 mph increasing to 10 to 15 mph in the afternoon. Winds could gust as high as 25 mph.
Tonight: Mostly clear, with a low around 37. South wind around 15 mph, with gusts as high as 30 mph.
Wednesday: Mostly cloudy, with a high near 53. Breezy, with a south southwest wind 15 to 20 mph, with gusts as high as 35 mph.
Wednesday Night: A 30 percent chance of showers. Cloudy, with a low around 35. South southwest wind 10 to 15 mph becoming west northwest after midnight. Winds could gust as high as 25 mph.
Thanksgiving Day: Mostly cloudy, with a high near 41. Northwest wind 10 to 15 mph, with gusts as high as 25 mph.
A surface ridge of high pressure is overhead across the area early this morning. Light westerly winds and mainly clear skies have allowed temperatures to drop off into the lower to mid 20s across the area as of this writing. While it will be a chilly start to the day, the warm air advection will kick up over the area today as the lower level flow turns south-southwesterly today along the western fringe of the eastward moving surface ridge. A good deal of sunshine is also expected through the day as large scale descent under the building mid-level ridge keeps clouds to a minimum. Temperatures should thus respond nicely today, warming into the lower 40s for afternoon highs as the surface winds become a bit breezy from the south late in the day.
Temperatures will not drop much tonight as breezy southerly winds and warm air advection continue through the night. In fact, we could even see temperatures rising overnight after hitting a minimum in the evening. Wednesday will be the warmest day of the week as the heart of the warm airmass shifts overhead in advance of an area of low pressure, and associated cold front, extending from the Plains northeastward over the Upper Midwest. Temperatures Wednesday afternoon look to top out in the lower 50s, though some mid 50s will be possible, especially if cloud cover ends up a bit less than currently forecast. The main negative for Wednesday’s weather will be the strong gusty south-southwesterly winds expected with the tight surface pressure gradient developing ahead of the approaching cold front. Wind speeds are likely to gust to 35 to 40 mph during the day as we mix into some stronger winds off the surface. The threat for any rain looks to hold off until Wednesday night as the surface cold front begins to move over the area.
Light to moderate frost on grass and vehicle glass and metal. Dew Point Depression 12 to 14°F with clear skies and winds less than 8 MPH.
Weather Radar is clear at 5:30 a.m.
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