Wednesday Hi 58, partly cloudy, winds NW 10 to 11 to 3 MPH, G15 to 18 to 15 MPH until 7p
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Wednesday and Wednesday Evening …
No Weather Hazards expected …
The Great Lakes upper low that has remained locked in place for the past several days will finally migrate eastward off the Atlantic coast into tonight. Rising heights aloft and a warming airmass overhead in its wake will support moderating temperatures over the next couple of days, though daily lake breezes will keep things cooler near the lake.
DISCUSSION…
The western periphery of the cloud cover associated with the Great Lakes upper low continues to reside near the western shores of Lake Michigan early this morning. With primarily clear skies currently in place across much of my IL counties west of the immediate Chicago area, much of the area will experience a good deal of sunshine today. However, there is likely to be another increase in mid and higher level cloud cover late this afternoon as a weak impulse tracks southward across the area into early this evening. In spite of this, temperatures today will have no problem warming above yesterdays values, especially for inland sections of northern IL, where highs should top the 60 degree mark. Closer to the lake, however, onshore winds behind an inland progressing lake breeze will keep conditions several degrees cooler this afternoon.
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O’HARE FORECAST …
Forecast Beginning Wednesday, May 03, 2023
Today: Mostly sunny, with a high near 58. North wind around 10 mph becoming east northeast in the afternoon. Winds could gust as high as 20 mph.
Tonight: Partly cloudy, with a low around 40. East wind 5 to 10 mph becoming light and variable in the evening. Winds could gust as high as 15 mph.
Thursday: Sunny, with a high near 69. Light south wind becoming east southeast 5 to 10 mph in the morning. Winds could gust as high as 20 mph.
Thursday Night: Partly cloudy, with a low around 51. South southeast wind around 10 mph, with gusts as high as 15 mph.
Friday: Partly sunny, with a high near 69. South southeast wind 10 to 15 mph, with gusts as high as 20 mph.
Friday Night: Mostly cloudy, with a low around 52.
Saturday: Partly sunny, with a high near 69.
Saturday Night: Partly cloudy, with a low around 52.
Sunday: Mostly sunny, with a high near 71.
Sunday Night: A chance of showers after 1am. Partly cloudy, with a low around 54.
Monday: A chance of showers. Mostly sunny, with a high near 75.
Monday Night: A chance of showers. Partly cloudy, with a low around 57.
Tuesday: A chance of showers. Partly sunny, with a high near 77.
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SUNLIGHT DATA FOR SECURITY, TRAFFIC SAFETY, AND SPORTS
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NIGHT SKY THIS MONTH …
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Area Forecast Discussion
National Weather Service Chicago/Romeoville, IL
627 AM CDT Wed May 3 2023
.SHORT TERM… Issued at 307 AM CDT Wed May 3 2023
Through Thursday…
The Great Lakes upper low that has remained locked in place for the past several days will finally migrate eastward off the Atlantic coast into tonight. Rising heights aloft and a warming airmass overhead in its wake will support moderating temperatures over the next couple of days, though daily lake breezes will kee Pthings cooler near the lake.
The western periphery of the cloud cover associated with the Great Lakes upper low continues to reside near the western shores of Lake Michigan early this morning. With primarily clear skies currently in place across much of my IL counties west of the immediate Chicago area, much of the area will experience a good deal of sunshine today. However, there is likely to be another increase in mid and higher level cloud cover late this afternoon as a weak impulse tracks southward across the area into early this evening. In spite of this, temperatures today will have no problem warming above yesterdays values, especially for inland sections of northern IL, where highs should top the 60 degree mark. Closer to the lake, however, onshore winds behind an inland progressing lake breeze will keep conditions several degrees cooler this afternoon.
Light surface winds under a surface high moving across the area into tonight, combined with clearing skies overnight, will support another chilly night tonight. Overnight temperatures are likely to bottom out into the mid to upper 30s in the typical cold spots, with lower 40s expected in the more urban areas. While this does not appear to be a night supportive of widespread frost development, we certainly cannot rule out some patchy early morning frost in the typical cold spots. Otherwise, expect temperatures to rebound quickly through the morning hours on Thursday.
Winds will turn south-southwesterly across most of the area on Thursday following the eastward departure of the weak surface high. As this occurs, the accompanying influx of warmer air from the southwest, in combination with mostly sunny skies, will support another significant jump in inland temperatures (into the lower 70s) on Thursday. Another lake breeze is likely again on Thursday, so temperatures will be several degrees cooler near the northeastern IL lakeshore during the afternoon.
KJB/NWS Chicago
