Tuesday Hi 53, partly sunny, winds NW 17 to 20 to 11 MPH, G26 to 31 to 16 MPH until midnight
⏪ Hrly Data Table | Hrly Future Graph ⏩
IMPORTANT NOTE ON NWS DATA
⏪ Hrly Data Table | Hrly Future Graph ⏩
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Tuesday and Tuesday Evening …
Weather Hazards expected …
Elevated Fire Weather Risk this afternoon.
Elevated Freeze Risk tonight.
The combination of gusty northwest winds and low relative humidity will result in an elevated risk for fire spread this afternoon in areas mainly along and southwest of a Dixon to Watseka Illinois line.
O’HARE FORECAST …
Forecast Beginning Tuesday, May 02, 2023
Today: A slight chance of showers before 9am, then a slight chance of showers after 3pm. Mostly cloudy, with a high near 53. Breezy, with a northwest wind 15 to 20 mph, with gusts as high as 30 mph. Chance of precipitation is 20%.
Tonight: Cloudy during the early evening, then gradual clearing, with a low around 35. Breezy, with a north northwest wind 15 to 20 mph decreasing to 10 to 15 mph after midnight. Winds could gust as high as 30 mph.
Wednesday: Mostly sunny, with a high near 58. North northwest wind around 10 mph becoming northeast in the afternoon. Winds could gust as high as 15 mph.
Wednesday Night: Partly cloudy, with a low around 41. East northeast wind around 5 mph becoming calm in the evening. Winds could gust as high as 10 mph.
Thursday: Sunny, with a high near 67. South southwest wind 5 to 10 mph becoming east southeast in the afternoon.
Thursday Night: Partly cloudy, with a low around 50.
Friday: Partly sunny, with a high near 69.
Friday Night: Mostly cloudy, with a low around 51.
Saturday: Mostly sunny, with a high near 71.
Saturday Night: Partly cloudy, with a low around 53.
Sunday: A chance of showers. Partly sunny, with a high near 76.
Sunday Night: A chance of showers. Mostly cloudy, with a low around 59.
Monday: A chance of showers. Partly sunny, with a high near 79.
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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Area Forecast Discussion
National Weather Service Chicago/Romeoville, IL
624 AM CDT Tue May 2 2023
.SHORT TERM… Issued at 325 AM CDT Tue May 2 2023
The persistent Great Lakes upper low will again pinwheel a couple additional impulses across our area today before it finally begins to migrate towards the Atlantic Coast on Wednesday. While these impulses will result in another day of breezy weather with mainly cloudy skies and some additional small chances for showers, there is likely to be a lot more dry time than what we have experienced the past couple of days. We will also have another day of below normal temperatures, especially across eastern sections of the area, but readings will be a couple of degrees warmer than yesterday.
All is currently dry across the area early this morning. In fact, we have even had a period of mainly clear skies across western and southwestern sections of the area for several hours overnight. Unfortunately, however, cloud cover is quickly shifting southward back over the area in advance of our next approaching impulse currently shifting down the western shores of Lake Michigan. This disturbance may support a short period of light rain and drizzle across parts of far northwestern IN and perhaps parts of far northeastern IL near Lake Michigan as it shifts across southern Lake Michigan shortly after daybreak this morning. Otherwise, our next small chance for light showers for eastern sections of the area is likely to hold off until our next impulse approaches the area during the mid to late afternoon hours.
Temperatures today are likely to be warmest in my southwest, where a much drier lower level airmass will also reside. Similar to yesterday, some peaks of sun and deeper mixing into this drier airmass will support temperatures topping out around 60 this afternoon. Expect readings to be a bit cooler farther to the east, with highs generally into the low to mid 50s. It will also be another breezy day as the surface gradient remains enhanced across the region between the Great Lakes low and high pressure over the Plains. Accordingly, frequent gusts of 30 to 35 mph are expected across a good portion of the area through the day. While not expected to reach advisory criteria, these wind speeds could support a period of enhanced fire weather concerns this afternoon as a much drier airmass (dewpoints in the teens and 20s) tries to creep as far northeast as parts of La Salle, Livingston and Ford counties. We will highlight this potential with an SPS.
Decreasing cloudiness and abating winds through the evening will support a chilly night across the area as readings fall off into the 30s. We could even see a few of the colder spots of northern IL fall to around freezing! Fortunately it appears that we will keep a 5 to 10 mph wind component for much of the night, so widespread frost development appears unlikely.
Dry and warmer weather is expected for Wednesday, with inland temperatures likely to top out in the lower 60s. Cooler conditions are likely near the lake as lighter winds under a surface ridge of high pressure will favor an afternoon lake breeze.