🌘 🌑 🌗 🌕 Waning Crescent Moon, sky cover overnight Sun. to Mon. 3% to 10% to 41%, winds W to WNW to WSW, 9 to 6 MPH, G16 to 13 MPH, Low 11, 5a to 7a
IMPORTANT NOTE ON NWS DATA
Overnight Sunday/Monday …
No Weather Hazards expected…
Single digit to lower teen temps tonight-early Monday AM. The morning low forecast for Monday lowered from 15 to 11°F.
Brief chance for snow (possibly ending with freezing drizzle?) Monday 3:00 p.m. 5:00 p.m. into lesser amount until about 5:00 a.m. Tuesday with no more than a dusting expected. Time frame for Arlington Heights and nearby northwest suburbs.
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O’HARE FORECAST …
Forecast Beginning Sunday Night, Dec. 18, 2022 …
Sunday Night: Mostly clear, with a low around 11. West wind 5 to 10 mph, with gusts as high as 15 mph.
Monday: A chance of flurries after 3pm. Increasing clouds, with a high near 27. West northwest wind around 5 mph becoming south southeast in the afternoon.
Monday Night: A 20 percent chance of snow. Cloudy, with a steady temperature around 26. South wind around 5 mph, with gusts as high as 10 mph.
Tuesday: Partly sunny, with a high near 34. South southwest wind 5 to 10 mph becoming northwest in the afternoon.
Tuesday Night: Mostly cloudy, with a low around 16. North northwest wind 5 to 10 mph.
Wednesday: Mostly cloudy, with a high near 25.
Wednesday Night: Snow likely, mainly after midnight. Cloudy, with a low around 21. Chance of precipitation is 60%.
Thursday: Snow. Cloudy, with a high near 26.
Thursday Night: Snow. Cloudy, with a low around 7. Blustery.
Friday: Snow likely. Mostly cloudy, with a high near 14. Windy.
Friday Night: A chance of snow. Mostly cloudy, with a low around 0. Blustery.
Saturday: Partly sunny and cold, with a high near 9. Blustery.
Saturday Night: Partly cloudy, with a low around -1.
Christmas Day: Mostly sunny, with a high near 12.
O’Hare forecast archive and hourly weather observations archive are available HERE on the CARDINAL NEWS Magazine.
NIGHT SKY THIS MONTH …
Check the night sky objects for this month and past months in the playlist from the Space Telescope Science Institute YouTube channel Backyard stargazers get a monthly guide to the northern hemisphere’s skywatching events with “Tonight’s Sky” (Musical track The Far River written by Jonn Serrie, from the album And the Stars Go With You courtesy of New World Music Ltd. Musical track The Far River written by Jonn Serrie, from the album And the Stars Go With You courtesy of New World Music Ltd).
Telephoto lens, ISO 100, f/11, Shutter Speed 1/100 to 1/125 for the Moon.
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Telephoto lens, ISO 1600, f/11, Shutter Speed 2.5″ for the skyline. The skyline exposure was toned down, and brightness and contrast was adjusted in Photoshop.
Area Forecast Discussion
National Weather Service Chicago/Romeoville, IL
539 PM CST Sun Dec 18 2022
.SHORT TERM… Issued at 250 PM CST Sun Dec 18 2022
Through Tuesday morning…
* Single digit to lower teen temps tonight-early Monday AM.
* Brief chance for snow (possibly ending with freezing drizzle?) Monday PM into Tuesday AM with no more than a dusting expected.
Sunshine has made a triumphant (albeit an unfortunately brief) return today across northern Illinois and northwest Indiana! Despite the clearing skies, temperatures have remained rather chilly in the upper teens to lower 20s combined with the lingering breezy winds have kept wind chills mainly in the single digits today. Winds begin to ease after sunset as the gradient eases some. Assuming skies remain mostly cleared out overnight, temperatures likely drop into the single digits (with low teens where clouds linger or redevelop). Thus forecast lows may not be low enough in some spots and too low in others but the message of a chilly night and start to the day on Monday remains the same.
Warm advection picks back up during the day on Monday in response to an approaching low-amplitude wave emanating out of the southwest with temperatures warming back in the mid to upper 20s. This wave will bring increasing potential for flurries by late Monday afternoon and into the evening. The snow rate may end up high enough to result in a quick dusting in areas generally north of a LaSalle to O`Hare line tonight. Overall not expecting big impacts with this system though. Confidence remains too low to include in the gridded forecast, but will mention that there is still a signal for a loss of saturation in the mid-levels Tuesday morning with lingering low-level moisture and renewed lift which could spit out some light drizzle or poor quality snow flakes (aka “snizzle”).