🌖 🌗 🌑 🌓 Waning Gibbous Moon, flurries with snow showers, sky cover overnight Sun. to Mon. 92% to 60% to 70%, winds SW to W to WNW, 7 to 15 to 9 MPH, Low 28, 5a to 7a
IMPORTANT NOTE ON NWS DATA
NIGHT FORECASTS …
NOTE: Keep in mind lunar rise and set times don’t always correspond with night weather and early morning lows because on some days during the month the moon is visible in the sky predominantly during the daytime hours.
Overnight Sunday/Monday …
Weather Hazards expected
Limited Snow risk.
Periods of snow showers will result in occasional sharply reduced visibility and spotty coatings of snow, including on some roads.
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O’HARE FORECAST …
Forecast Beginning Sunday Night, Mar. 12, 2023 …
Sunday Night: Snow showers before 9pm, then scattered snow showers after 2am. Low around 28. West wind 10 to 15 mph, with gusts as high as 25 mph. Chance of precipitation is 80%. New snow accumulation of less than a half inch possible.
Monday: Scattered snow showers before 1pm, then scattered flurries between 1pm and 4pm, then isolated snow showers after 4pm. Cloudy, with a high near 35. Breezy, with a north northwest wind 10 to 20 mph, with gusts as high as 25 mph. Chance of precipitation is 40%.
Monday Night: Isolated snow showers before 7pm, then scattered flurries between 7pm and 1am. Mostly cloudy, with a low around 21. North northwest wind 10 to 15 mph, with gusts as high as 20 mph. Chance of precipitation is 10%.
Tuesday: Sunny, with a high near 35. North northwest wind around 10 mph, with gusts as high as 15 mph.
Tuesday Night: Mostly clear, with a low around 22.
Wednesday: Mostly sunny, with a high near 48.
Wednesday Night: Mostly cloudy, with a low around 39.
Thursday: Showers likely, mainly after 1pm. Cloudy, with a high near 51.
Thursday Night: Rain. Cloudy, with a low around 37.
Friday: A chance of rain and snow. Mostly cloudy, with a high near 41. Breezy.
Friday Night: Mostly cloudy, with a low around 23. Breezy.
Saturday: Partly sunny, with a high near 33. Breezy.
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
242 AM CDT Mon Mar 13 2023
.SHORT TERM… Issued at 242 AM CDT Mon Mar 13 2023
* Frequent flurries and occasional snow showers sharply reducing visibility and bringing quick accums under one inch today; the more robust snow showers are favored over northeast Illinois at times this morning and northwest Indiana during midday
* Lake effect snow showers in far northwest Indiana late today and tonight with amounts generally under two inches in that time
* Blustery and unseasonably chilly through midday Tuesday, with the lowest wind chills of single digits to lower teens during early Tuesday morning
A cold look to the satellite water vapor imagery this morning, with a closed low centered across southern Wisconsin moving southeast. Mid-level temperatures observed near the center last evening on the 00Z MPX sounding fell in the coldest tenth percentile for mid March. Regional radar imagery indicates spiraling areas of snow showers spanning a couple hundred miles around this circulation, spawned by strong differential cyclonic vorticity advection (DCVA) and steepened lapse rates from those cool temperatures aloft. This radar presentation should largely hold through the morning as the upper level low tracks to the Michiana region.
In the low-levels, a re-enforcing cold front will be forced southward over the forecast area this morning into early afternoon and this will align with the continued forcing noted above. The convergence along this front will be greatest in northeast Illinois into northwest Indiana, and there is signal for a semi- concentrated area of robust snow showers within this strongly forced zone. Upstream early this morning that is evident in east central Wisconsin. Forecast profiles for the Chicago area from 9-11 A.M. indicate positive CAPE and the upper portion of the unstable layer intersecting the dendritic growth zone (DGZ). Already early this morning here in Romeoville we saw some larger sized flakes within snow showers, so seems like the DGZ will be in play with any snow showers today. Will have to keep an eye on this mid to late morning activity near that front, with shar Preductions in visibility and quick accumulations of one half to one inch within an hour possible. These snow showers are also ahead of an abrupt wind speed increase, with a period of gusts to 30 mph and even 35 mph near the lake shore. So if these elements align, it could bring brief snow squall-like behavior. One key uncertainty though is that some convection-allowing models (CAMs) take all of this heavy snow shower signal offshore of northeast Illinois. Most though do bring some of it into northwest Indiana by early this afternoon, with continued forcing for a few hours during the first half of the afternoon. So will message the potential for some robust snow showers for motorists during the mid-morning through early afternoon period.
With cold advection behind the front and widespread clouds, temperatures will basically go nowhere during today. Flurries and occasional snow showers should continue from the cloud deck into this evening, with some diurnal component able to keep coverage u Pin the afternoon. The subsidence inversion will finally lower enough to erode the cloud deck late tonight into early Tuesday morning with high confidence.
As for lake effect snow showers, far northwest Indiana looks to be under streaming lake effect snow showers later today and tonight, with peak coverage into Porter County (and points east) during the evening hours. The difference between the 850 mb temperatures and lake surface is around 15C and that or higher is usually good for lake effect if enough saturation, and that doesn`t look to be a problem. Lake-induced cloud tops are forecast around 7 kft. so not off the charts. With a 9-12 hour period of snow showers, seemingly a couple inches to maybe even three inches on the high end could materialize in Porter County.
Tuesday will be sunny for most, with lake effect clouds fading over northwest Indiana by midday. High pressure of 1030 mb will pass during the afternoon. Temperatures over the snow cover areas of far northern Illinois will see similar highs to today, while south of there upper 30s are on track.