About 9:00 p.m. Friday The National Weather Service tweaked the morning low for Arlington Heights this Saturday morning September 19, 2020 from 50°F to 46° and that new low morning low was on target. The morning low for the hourly report at O’Hare was 46°F at 5:51 a.m. Chicago Executive Airport reported a low of 44. DuPage Airport in West Chicago reported a low of 37°F.
There was no frost reported in the northwest suburbs. A Canadian high pressure air mass centered over Lake Huron and the northern great lakes with clear skies and diminished winds allowed maximal radiational heat loss overnight in our area as it moved into lower Michigan. Saturday should heat up to the mid-60s as the air mass moves east and skies will be clear of clouds. There were some lake effect clouds overhead early Saturday morning, but skies will be clear and the high temperatures in Arlington Heights will hit 64°F about 3PM to 4PM.
Upper level smoke from the western wildland fires will remain west of Chicagoland through Saturday and then possibly move in to the area Saturday night into Sunday. Clears skies, except for smoke trapped with an upper ridge over the High Plains, might bring an interesting sunset Sunday evening, and Sunday’s daytime temperatures will be 1 or 2 degrees lower because of the upper level smoke. However a warming trend is expected later in the week with 80°F forecast by Wednesday in the always less reliable long-range forecast.
Dry conditions persist and will persist this week at least through Wednesday, September 23, 2020.
Weather Radar in northeast Illinois is clear.
Dry conditions continue into at least mid-week amid a gradual warming trend. While skies this weekend should remain mostly void of clouds, smoke from the western wildfires is expected to drift back over the area (but remain aloft) Sunday into Monday, leading to milky skies. pic.twitter.com/BGVnY0TP0j
— NWS Chicago (@NWSChicago) September 19, 2020
O’HARE FORECAST …
Today: Sunny, with a high near 64. South southeast wind 5 to 10 mph becoming east in the afternoon.
Tonight: Clear, with a low around 47. East wind around 5 mph.
Sunday: Sunny, with a high near 70. South southeast wind 5 to 10 mph.
Sunday Night: Mostly clear, with a low around 52. South southeast wind around 5 mph, with gusts as high as 15 mph.
Monday: Sunny, with a high near 75. South wind 5 to 10 mph, with gusts as high as 15 mph.
Monday Night: Mostly clear, with a low around 54.
Tuesday: Sunny, with a high near 79.
Tuesday Night: Mostly clear, with a low around 58.
Wednesday: Sunny, with a high near 80.
Wednesday Night: Partly cloudy, with a low around 59.
Thursday: Mostly sunny, with a high near 74.
Thursday Night: Mostly clear, with a low around 56.
Friday: Sunny, with a high near 76.
LAKE TEMPS …
SOUTHERN LAKE MICHIGAN WATER TEMPERATURES
NATIONAL WEATHER SERVICE CHICAGO/ROMEOVILLE IL
904 AM CDT Sat Sep 19 2020
LAKE MICHIGAN WATER TEMPERATURES…
WINTHROP HARBOR BUOY……….64.
MICHIGAN CITY BUOY……….M.
SOUTH MID LAKE BUOY……….66.
NORTH MID LAKE BUOY……….60.
M IS FOR MISSING DATA THAT IS NORMALLY AVAILABLE.
Chicago Weather Forecast for your MAC/PC/TABLET includes surrounding suburbs.
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SMOKE EARLIER IN WEEK …
Here is a visible satellite image valid at 2pm PDT showing the vast extent of the wildfire smoke. The area in the orange contour is smoke in the mid-upper levels of the atmosphere that has reached as far east as Michigan! The red contour is the dense smoke near the West Coast. pic.twitter.com/J0OEFVA4oD
— NWS Weather Prediction Center (@NWSWPC) September 13, 2020
The NASA smoke model not painting a pretty picture for the next 5 days in the Pacific NW. Also notice how the eastbound smoke gets wrapped up in Paulette later in the week. #idwx #orwx pic.twitter.com/aLL3tZFA87
— NWS Boise (@NWSBoise) September 14, 2020
Research has shown that exposure to wildfire smoke may alter the immune system for years—and children are especially at risk. Blood tests of 36 children exposed to wildfire smoke showed changes to a gene involved in the development and function of T cells https://t.co/gtcevY0nYA
— WIRED (@WIRED) September 15, 2020
— Fox News (@FoxNews) September 14, 2020