Tuesday Hi 81, partly sunny to partly cloudy, winds WNW to NW to NE, 3 to 15 MPH, G15 to 21 MPH until 12a Wed.
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IMPORTANT NOTE ON NWS DATA
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Tuesday and Tuesday Evening …
No Weather Hazards …
Wind gusts to 20 MPH.
O’HARE FORECAST …
Forecast Beginning Tuesday, May 16, 2023
Tuesday: Partly sunny, with a high near 81. West northwest wind 5 to 15 mph, with gusts as high as 20 mph.
Tuesday Night: Partly cloudy, with a low around 48. North northeast wind 10 to 15 mph, with gusts as high as 25 mph.
Wednesday: Sunny, with a high near 62. Northeast wind around 10 mph, with gusts as high as 15 mph.
Wednesday Night: Mostly clear, with a low around 47. Northeast wind 5 to 10 mph becoming southeast after midnight.
Thursday: Sunny, with a high near 75. South southeast wind around 10 mph.
Thursday Night: A 20 percent chance of showers after 1am. Partly cloudy, with a low around 56.
Friday: A 50 percent chance of showers. Mostly sunny, with a high near 73.
Friday Night: A chance of showers. Partly cloudy, with a low around 52.
Saturday: Sunny, with a high near 69.
Saturday Night: Mostly clear, with a low around 53.
Sunday: Sunny, with a high near 73.
Sunday Night: Mostly clear, with a low around 51.
Monday: Sunny, with a high near 73.
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 …
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Area Forecast Discussion
National Weather Service Chicago/Romeoville, IL
620 AM CDT Tue May 16 2023
.SHORT TERM… Issued at 232 AM CDT Tue May 16 2023
Primary (only) forecast concern in short term is well advertised pneumonia front expected to blow in off the lake late this afternoon.
Convectively enhanced shortwave trough passing to our south this morning still looks to bring a few sprinkles or light showers to far southern portions of our CWA early this morning. Otherwise, look for decreasing cloudiness from north to south today, with the afternoon expected to feature mostly sunny skies northern CWA. Clouds will be a bit slower to depart the farther south you get of I-80 and this will keep temps a bit cooler there. To the north of I-80, sunshine, deep mixing, and 925mb temps in the upper teens will support highs around 80 or in the lower 80s. West to northwest winds should allow for a weak lake breeze to move inland across northwest IN and the southeast side of Chicago, likely keeping temps a bit cooler there as well this afternoon.
The bigger short term headline is obviously the back door lake enhanced cold front that will result in a rapid drop in temps this afternoon. Guidance has trended ever so slightly slower (an hour or so) and have made similar adjustments in the grids. Continue to favor the faster guidance given the tendency for these fronts to outpace guidance a bit. Weak lake breeze and associated cooling ahead of the front will likely temper the tem Pfall over NW IN and southeast side of Chicago. Along the north shore of the lakefront, still looks like temps should drop from around 80 into the 50s in minutes with the fropa between about 22-00z. Gusty north northeast winds are expected behind the front, especially close to the lake where winds could gust to around 30 mph behind the front.
Deep mixing is expected ahead of the front with what little boundary layer moisture there is expected to mix out this afternoon. The chances of any high based showers along or just behind the front over NC IL and Rockford area look pretty low. Maintained some slight chance pops NW CWA just in case, but most areas (everyone?) will probably not see any rain.
Wednesday will be sunny and pleasant. Synoptic northeasterly flow should result in a larger than typical footprint of lake cooling downwind of the lake. Highs should range from 70s across central IL and out toward the I-39 corridor, with 60s common across the Chicago metro area. Temps will likely hold in the 50s right along the lakefront.
– Izzi/NWS Chicago