🌔 🌕 🌗 🌑 Waxing Gibbous Moon, sky cover overnight Sat. to Sun. 5% to 18% to 3%, winds W to SW, 8 to 11 MPH, G14 to 0 to 18 MPH, Low 22, 8a to 9a
NWS CHGO | NWS HRLY | /NWSchicago | 🌡
ARLINGTON HEIGHTS WEATHER
▴ forecast7 (Arl. Hts.) | RADAR | WIDE RADAR
IMPORTANT NOTE ON NWS DATA
Overnight Saturday/Sunday …
No Weather Hazards expected…
Quiet weather with moderating temperatures are expected into Monday. Only real weather concern is low chances of light rain or drizzle Monday afternoon. At this time have maintained dry forecast except for northwest Indiana (Sun Dec 4 2022 at 1:55 AM).
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O’HARE FORECAST …
Forecast Beginning Saturday Night, Dec. 3, 2022
Saturday: Mostly clear, with a low around 20. West wind 5 to 10 mph, with gusts as high as 15 mph.
Sunday: Sunny, with a high near 39. Southwest wind 10 to 15 mph, with gusts as high as 25 mph.
Sunday Night: Partly cloudy, with a low around 28. Southwest wind around 10 mph, with gusts as high as 15 mph.
Monday: A 20 percent chance of rain after noon. Mostly cloudy, with a high near 43. South southwest wind 10 to 15 mph, with gusts as high as 20 mph.
Monday Night: Mostly cloudy, with a low around 28.
Tuesday: Mostly cloudy, with a high near 39.
Tuesday Night: A chance of rain before midnight. Mostly cloudy, with a low around 32.
Wednesday: Partly sunny, with a high near 42.
Wednesday Night: Mostly cloudy, with a low around 30.
Thursday: Mostly cloudy, with a high near 41.
Thursday Night: A chance of snow. Mostly cloudy, with a low around 31.
Friday: A chance of snow. Partly sunny, with a high near 40.
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 526 AM CST Sun Dec 4 2022
.SHORT TERM… Issued at 155 AM CST Sun Dec 4 2022
Quiet weather with moderating temperatures are expected into Monday. Only real weather concern is low chances of light rain or drizzle Monday afternoon. At this time have maintained dry forecast except for northwest Indiana.
Current GOES vapor imagery and 00Z upper air analysis depicts fast, largely zonal flow across the Midwest early this morning. The core of the upper jet was overhead, with DVN and ILX`s evening RAOBs sampling 155-165 kt just above the tropopause. At the surface, an elongated area of high pressure stretched from the southern Plains through the Ohio Valley, with a 1032 mb center over far southern Illinois. Farther north, deep low pressure was located over northern Saskatchewan. A series of sheared mid-level short wave features will track north of the jet axis across southern Canada through today, with the aforementioned surface low eventually passing north of Lake Superior tonight. Meanwhile, the surface high over the Ohio Valley will slowly move east. Between these areas of lower and higher pressure, warm advection was already underway (above our stable boundary layer at least) within a breezy west-southwest wind regime aloft. Other than some high jet-induced cirrus across the far southern cwa this morning, our dry atmosphere will again allow for plentiful sunshine across the area today. Southwest surface winds and warm advection will combine with the December sun to moderate temps into the upper 30s/around 40 by this afternoon. Southwest winds gusting 15-20 mph will still make it feel a little chillier however with wind chills in the lower 30s.
As the elongated area of surface high pressure to our south moves east tonight, and a surface cold front trails the low north of Lake Superior across the upper Mississippi Valley and Plains, some moisture return will begin to develop south and southwest of our region. This will initially work its way into the Midwest as an increase in mid and high level cloud cover late tonight into Monday morning. Thus after clear evening skies, we will see an increase in high clouds after midnight. Low level moisture looks to arrive during the day Monday, ahead of the aforementioned cold front which will move into the western parts of the cwa late in the day. Various model forecast soundings differ with the depiction of the depth of the low-level moisture layer, but even the most robust guidance depicts this moisture generally below 800-850 mb. NAM-based guidance would potentially support a deep enough cloud layer for some patchy drizzle to develop by afternoon, though the NAM-based models generally have a higher low level moisture bias and other guidance generally depicts a shallower saturated layer. HREF ensemble max QPF (less than 0.10″) generally focuses chances for any light preci Pnorth of the area across Wisconsin, and across our far southeast counties from parts of central Illinois into northern Indiana. Thus will maintain a generally dry forecast for most of the area, but will carry some slight chance pops for light rain east of the IL/IN border Monday afternoon. Though cloud cover will be thickening across the area Monday, persistent low level warm advection should support temps further moderating into the low-mid 40s across the area.
Area Forecast Discussion
National Weather Service Chicago/Romeoville, IL
1056 PM CST Sat Dec 3 2022
.SHORT TERM… Issued at 127 PM CST Sat Dec 3 2022
Through Sunday night…
Quiet but cold conditions will continue tonight as a strong 1032+ mb surface high shifts eastward across Mid-Mississippi Valley. Clear skies and light winds with this high should allow temperatures to fall back into the teens in most areas outside of the city tonight. While this will be setting up a chilly start to the day Sunday, warm air advecton is expected to quickly ramp u Poverhead following the eastward departing surface high. This in combination with ample sunshine should thus allow temperatures to moderate back into the mid to upper 30s for highs Sunday afternoon, though at the cost of some breezy southwest winds.
Quiet weather will continue Sunday night, though we will begin to see an increase in higher level cloudiness in advance of the next approaching weather disturbance moving across the Upper Midwest.