Friday Hi 69, partly cloudy, winds SW to W to NW to N, 10 to 8 to 13 MPH, G16 to 14 to 18 MPH into Saturday
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IMPORTANT NOTE ON NWS DATA
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Saturday Evening …
No (?) Weather Hazards …
O’HARE FORECAST …
Forecast Beginning Saturday, May 20, 2023
O’HARE FORECAST …
Sorry, incomplete forecast, built from Thursday.
Saturday: Sunny, with a high near 68.
Saturday Night: Mostly clear, with a low around 52.
Sunday: Sunny, with a high near 76.
Sunday Night: Mostly clear, with a low around 49.
Monday: Sunny, with a high near 69.
Monday Night: Mostly clear, with a low around 52.
Tuesday: Sunny, with a high near 77.
Tuesday Night: Mostly clear, with a low around 56.
Wednesday: Sunny, with a high near 81.
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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SAT MAY 20 2023 NOT RETRIEVED
Area Forecast Discussion
National Weather Service Chicago/Romeoville, IL
626 AM CDT Fri May 19 2023 (Long Term is available)
.SHORT TERM… Issued at 217 AM CDT Fri May 19 2023
A recent hand surface analysis places a baggy trough axis along a weak cold front stretching from central Wisconsin to far northwestern Illinois and into the Southern Plains. Low- to mid- level moisture ahead of the front is fairly scant with surface dew points only in the low to mid 50s and mean 700-300mb relative humidity values of only around 30-40% (re: 00Z DVN RAOB). As the front drifts eastward slowly this morning, so should the ongoing scattered showers from eastern Iowa into northern Illinois while gradually decreasing in intensity and coverage given the aforementioned antecedent dry airmass in place. However, the temporal intersection of the approaching upper-level shortwave and afternoon “daytime” heating should support an increase in shower coverage this afternoon primarily near and east of I-55. In fact, shallow low-level moisture advection ahead of the front may provide just enough low-level instability to support a thunderstorm or two as equilibrium levels nose toward -20C. In spite of appreciable deep-layer shear afforded by a 50kt 500mb jet along the periphery of the upper-level shortwave, the low- centroid and marginal character of instability suggests thunderstorm intensity should be rather weak (by the standards of May, at least) with threats for only locally gusty winds and occasional lightning strikes. Such threats appear greatest after 12 PM (and again, near and east of I-55).
Behind the cold front, breezy northwest winds will settle into the region with partially clearing skies. Experimental RAP-SMOKE output continues to advertise downward mixing of Canadian wildfire smoke toward the ground right behind the front from mid-morning to early afternoon, which seems plausible given upstream observations of visibility ranging from 7 to 9 miles. It`s tough to say whether the smoke will really be noticeable at the ground as the simulated total vertically integrated plume appears to lessen in concentration into northern Illinois and northwestern Indiana. Regardless, any remaining smoke should clear out tonight as a surface high pressure system builds into the area and crashes mixing heights and associated surface winds. Ideal radiational cooling conditions will allow for overnight lows to drop into the mid to upper 40s.
Saturday looks quiet with a surface high overhead leading to light winds and sunny skies (e.g. no smoke). Highs will climb into the upper 60s to lower 70s with locally cooler conditions along the Lake Michigan shore.
.LONG TERM… Issued at 217 AM CDT Fri May 19 2023
Sunday through Thursday…
Sunday through at least Friday look unusually quiet thanks to an upper-level blocking pattern across the eastern United States and a resident dry surface high pressure system parked over the Great Lakes. Highs will climb from the upper 70s on Sunday to the lower 80s on Monday/Tuesday and then mid 80s on Wednesday/Thursday. Locally cooler temperatures will occur along the Lake Michigan shoreline in the wake of daily lake breezes. Low humidity levels and light surface winds will prevail, and no precipitation is in our forecast. The fly in the ointment in an otherwise spectacular late-May pattern is another upper-level plume of Canadian wildfire smoke poised to stream over the Great Lakes starting Sunday. With column-average winds stagnating by the middle of the week, any smoke that spreads over the Great Lakes may become “trapped” and linger for days. Accordingly, a murky appearance to the sky appears all but likely at times next week.
Looking beyond the 7-day period, EPS/GEFS meteograms of mean 24-hour QPF advertise a return of precipitation chances toward Memorial Day.