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  • Tim McGill

Wildfire Smoke Will Dim Sun Again Today

Smoke From A Distant Fire


Wildfires that have raged out west will continue to spread smoke our way today. California has seen more than 3 million acres burned so far for a record breaking year. The jet stream has carried that smoke along with smoke from fires in Oregon and Washington State all the way to the east coast. Yesterday the smoke gave the sun a milky or hazy look and it will do so again today. The smoke is aloft and not reaching the surface but it is still impacting our weather. It will diminish the sun enough to keep us a couple of degrees cooler today.


Below is the RAP model vertically integrated smoke forecast for Tuesday afternoon showing the spread of smoke across the country.



So with the smoke today we will see high temperatures right around average. Look for middle to upper 70s today. We will warm more on Wednesday with highs in the lower 80s.



Dramatic Drop Developing


From the 80s Wednesday we will fall into the 40s for lows early Friday morning in some spots. This dramatic drop in temperatures is a result of a cold front crossing through the area late Wednesday. Back below average Thursday through Saturday with highs only in the 60s before warming up again by early next week.


The longer range forecasts suggest we may end the month above average. The 6-10 day temperature probability forecast has us outlooked to be near normal from September 20th through the 24th but the 8-14 day forecast has us outlooked above average overall from September 22nd through the 28th.



Slim End Of September Rainfall Chances


Rainfall will be limited to just a few chances through a week from this Thursday. A few showers are possible Wednesday night with the arrival of the cold front. The next decent chance at rain would be a week from Thursday with possible scattered showers and thunderstorms.



The GFS model total precipitation accumulation forecast through Sunday does squeeze out some rain for Chicago and northern Illinois. It has between a tenth of an inch to around a third of an inch in total here. That may be a little overdone based on previous rainfall forecasts and the fact that the cold front Wednesday night will have limited moisture to work with as it comes through.



While we are more than an inch above average with rainfall this month we could still use some more. We are still down about four inches from average since the start of July and the long range forecasts aren't promising for rainfall. Both the 6-10 and 8-14 day precipitation probability forecasts have us outlooked for below average precipitation for the period of September 20th through the 28th.




Here is my 7 day forecast:


Today: Partly to mostly sunny, hazy High: 78


Wednesday: Partly to mostly sunny Low: 58 High: 81


Thursday: Partly to mostly sunny, breezy Low: 57 High: 67


Friday: Mostly sunny Low: 51 High: 64


Saturday: Mostly sunny Low: 49 High: 66


Sunday: Mostly sunny Low: 50 High: 74


Monday: Mostly sunny Low: 54 High: 78

#ilwx

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