Friday Hi 33, gradual clearing skies to partly sunny, winds WNW to W to NW, 8 to 5 MPH
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ARLINGTON HEIGHTS WEATHER
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Friday and Friday Night …
Weather Hazards expected…
Radar clear, but risk of slippery surfaces from overnight snow flurries and frozen road surfaces.
DISCUSSION…
A mix of patchy very light snow, drizzle and freezing drizzle (which was on and off overnight until about 4:00 a.m. Friday) may result in ongoing slick spots on elevated and untreated surfaces early Friday morning across parts of far northeast Illinois and northwest Indiana.
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O’HARE FORECAST …
Forecast Beginning Friday, Jan. 06, 2023
Friday: Cloudy, with a high near 34. West wind 5 to 10 mph.
Friday Night: Mostly cloudy, with a low around 24. West northwest wind around 5 mph.
Saturday: Mostly sunny, with a high near 36. North wind around 5 mph.
Saturday Night: Mostly cloudy, with a low around 27. East wind around 5 mph.
Sunday: Partly sunny, with a high near 37. Calm wind becoming north around 5 mph in the afternoon.
Sunday Night: Mostly clear, with a low around 25.
Monday: Mostly sunny, with a high near 40.
Monday Night: Mostly cloudy, with a low around 31.
Tuesday: Mostly cloudy, with a high near 38.
Tuesday Night: Mostly cloudy, with a low around 28.
Wednesday: Mostly cloudy, with a high near 37.
Wednesday Night: Mostly cloudy, with a low around 29.
Thursday: A chance of rain and snow. Mostly cloudy, with a high near 37.
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SUNLIGHT DATA FOR SECURITY, TRAFFIC SAFETY, AND SPORTS
SunCalc.net data with solar azimuth and trajectory, times for dawn, sunrise, solar noon, sunset, dusk …
NIGHT SKY THIS MONTH …
Backyard stargazers get a monthly guide to the northern hemisphere’s skywatching events with “Tonight’s Sky.” Check the night sky objects for this month and past months in the playlist from the Space Telescope Science Institute YouTube channel (Musical track The Far River written by Jonn Serrie, from the album And the Stars Go With You courtesy of New World Music Ltd).
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Area Forecast Discussion
National Weather Service Chicago/Romeoville, IL
530 AM CST Fri Jan 6 2023
.SHORT TERM… Issued at 247 AM CST Fri Jan 6 2023
Through Saturday…
Main forecast concerns are lingering very light snow/drizzle across far northeast IL and northwest IN early this morning. Some patchy very light freezing drizzle is possible, though no major travel impacts are expected with temps around the freezing mark and precip very light.
Early morning GOES vapor imagery indicates our slow moving upper low had drifted east of the forecast area across the central Great Lakes. Several smaller-scale mid-level vorts were noted within the north-northwest flow west of the low, including one tracking southeast across northern IN, another moving south-southeast across eastern WI and a more sheared short wave further upstream across the eastern Dakotas/western MN. Regional radar composite depicted light returns over eastern WI, northeast IL and northern IN as of 245 am, where slightly deeper low level moisture and forcing associated with deep cyclonic flow and embedded waves were producing light snow, flurries and some patchy drizzle. Temperatures were generally at or above 32F where radar-detectable precipitation was occurring, though some patchy very light freezing drizzle has been noted along the western periphery of the radar returns where temps have fallen to around 30F. Here at our office in Romeoville, some elevated surfaces have accumulated some very thin bumpy ice (like sand paper), though sidewalks and parking lots show no signs of slipperiness. Not expecting any significant impacts to road surfaces early this morning, but will issue a special weather statement shortly to mention some very light patchy freezing drizzle is possible through about sunrise across far northeast IL/northwest IN before precipitation ends shortly thereafter.
Otherwise, shallow low clouds will likely linger across especially east and northeast parts of the forecast area today in a weak cool advection regime, while some partial clearing is possible over far west and southwest sections of the cwa later this afternoon. Skies will remain partly cloudy tonight and into Saturday within a col (intersection of lingering weak surface trough and weak high pressure ridge). Light, convergent surface winds and partly cloudy conditions may allow for patchy fog development tonight in some spots outside the urban core of the Chicago metro.
Surface winds turn light northeast on Saturday, in response to low pressure developing from the Plains into the lower Missouri Valley associated with a mid-level short wave trough (currently seen in vapor imagery over southern CA/NV/AZ) propagating toward the region. Dry weather expected to persist through the day locally however, as moisture return and forcing associated with this approaching wave remain focused south of the forecast area cross the lower Missouri and lower Ohio/Mississippi valleys. Temperatures through the short term period will remain near/slightly above average for early January, with daytime highs in the low-mid 30s and lows tonight in the teens and 20s.
Ratzer/NWS Chicago
