🌔 🌕 🌗 🌑 Waxing Gibbous Moon, sky cover overnight Thu. to Fri. 98% to 22% to 64%, winds SSW, 14 to 18 MPH, G22 to 29 MPH, Low 30, 3a
NWS CHGO | NWS HRLY | /NWSchicago | 🌡
ARLINGTON HEIGHTS WEATHER
▴ forecast7 (Arl. Hts.) | RADAR | WIDE RADAR
IMPORTANT NOTE ON NWS DATA
Overnight Thursday/Friday …
No Weather Hazards expected…
Gusty winds into Friday and through Saturday.
Steadily, slightly rising temperatures overnight Thursday to Friday in the low 30s.
Gusty winds Friday through Saturday with gusts of 40 to 45 mph expected.
Chance for light rain showers and/or drizzle late Friday afternoon and evening along a cold front.
Rapidly cooling temperatures Friday night behind the front.
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O’HARE FORECAST …
Forecast Beginning Thursday Night, Dec. 1, 2022
Thursday Night: Cloudy during the early evening, then gradual clearing, with a low around 30. South wind around 15 mph, with gusts as high as 30 mph.
Friday: A slight chance of drizzle after 2pm. Partly sunny, with a high near 50. Breezy, with a south wind 15 to 25 mph, with gusts as high as 35 mph.
Friday Night: A chance of rain before midnight, then a slight chance of drizzle between midnight and 3am. Cloudy, then gradually becoming partly cloudy, with a low around 22. Windy, with a south southwest wind 25 to 30 mph becoming west northwest after midnight. Winds could gust as high as 45 mph. Chance of precipitation is 30%.
Saturday: Sunny, with a high near 30. Blustery, with a west northwest wind 15 to 20 mph decreasing to 10 to 15 mph in the afternoon. Winds could gust as high as 40 mph.
Saturday Night: Partly cloudy, with a low around 21. West wind 5 to 10 mph, with gusts as high as 15 mph.
Sunday: Sunny, with a high near 40.
Sunday Night: Partly cloudy, with a low around 25.
Monday: A chance of rain after noon. Mostly cloudy, with a high near 41.
Monday Night: A chance of rain before midnight. Mostly cloudy, with a low around 31.
Tuesday: A chance of snow after noon. Mostly cloudy, with a high near 38.
Tuesday Night: Mostly cloudy, with a low around 23.
Wednesday: Mostly sunny, with a high near 34.
Wednesday Night: Partly cloudy, with a low around 20.
Thursday: Partly sunny, with a high near 34.
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
530 PM CST Thu Dec 1 2022
.SHORT TERM… Issued at 326 PM CST Thu Dec 1 2022
Key forecast messages through Saturday: *Gusty winds Friday through Saturday with gusts of 40 to 45 mph expected.
*Chance for light rain showers and/or drizzle late Friday afternoon and evening along a cold front.
*Rapidly cooling temperatures Friday night behind the front.
The surface high that is responsible for the sunny skies today continues to move eastward into the northeast this afternoon as a developing surface low moves into the northern Plains ahead of an upper-level trough that is moving through the Pacific northwest. The surface low is expected to continue to deepen as it moves into the northern Great Lakes and southern Canada through the day on Friday which will create a tightening pressure gradient across northeastern Illinois and northwest Indiana ahead of a cold front that will swing through the area Friday evening. This will allow gusty southerly winds to develop across the area late tonight and linger into the day on Saturday with wind gusts of 30 to 35 mph on Friday becoming westerly 40 to 45 mph Friday night into Saturday morning behind the cold front. There continues to be some uncertainty in exactly how strong the winds will become especially in the warm advection wing Friday afternoon, but if the atmosphere is able to mix as forecast soundings suggest higher gusts could certainly be realized during the afternoon and evening hours. The strongest winds are expected to arrive behind the cold front as strong cold advection takes over and allows the atmosphere to tap into a strong low-level jet and brings 40 to 45 mph gusts to the surface. While these winds are close to wind advisory criteria I decided to hold off on a formal issuance for now given the lingering uncertainty and time range of the strongest winds, but one may be needed with the overnight forecast update.
In addition to the winds, the cold front will also bring with it the chance for light rain showers and/or drizzle late Friday afternoon into the early part of Saturday morning. Forecast soundings continue to show that while the low-levels are rather saturated the mid- levels are expected to remain dry. This dry air should limit the development of more robust precipitation and keep any showers light and confined mostly to the cold front. However, some pockets of drizzle do look to be possible late Friday afternoon as surface moisture surges into the region. Precipitation chances will come to an end as the front passes with most areas expected to be rain-free by Saturday morning.
Lastly, temperatures will be a roller coaster to close out the week and start the weekend. The warm advection ahead of the front will allow temperatures to warm into upper 40s and lower 50s Friday afternoon and evening, but once the front passes the strong cold advection behind it will cause temperatures to plummet heading into Saturday morning. Lows on Saturday morning are expected to start off in the upper teens and lower 20s with wind chills in the single digits for most areas. Highs on Saturday will also be cold with temperatures struggling to reach freezing. Despite the cold temperatures skies will clear out through the day on Saturday as high pressure builds back into the area with winds gradually easing through the day as well.