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  • Tim McGill

Not Done With 90s Yet

There have been 25 90-degree days so far this year. An average year would see 14 90-degree days. There are more to come this year. We will be near 90° today, tomorrow and Sunday. The most likely days to see highs of 90° or more though will be Monday through Thursday next week. In other words, we will most likely double the average number of 90-degree days we see in an average year.


The highs today will reach into the upper 80s with lower 80s along the lakefront because of a breeze off the lake.

The heat builds next week with forecast models looking at the most likely period of 90s to occur Monday through Thursday. There will be in increase in humidity also but it isn't expected to be at oppressive levels.

The pattern that brings the heat next week also cuts down our chances for any significant rainfall. The GFS model suggests a possibility of some rain Monday and Wednesday but the chances are small for anything significant.



The total rainfall forecast through next Friday (August 28th) from the GFS model is anywhere between a couple tenths of an inch of rain to just under a half inch. Since July 1st O'Hare is down just under 4 inches compared to average.



More rain will be needed than that to help us avoid slipping into a drought soon. The latest U.S. Drought Monitor now has an expanding area of "abnormally dry" conditions moving into our area. It includes portions of Cook, DuPage, Will, Kane and Kendall counties. The area that falls into the abnormally dry category has almost tripled compared to a week ago. I blogged about the worsening conditions a few days ago. If this worsens even more, the next category portions of northern Illinois could fall into would be "moderate drought".



We do find hope though looking longer range. The 6-10 day and 8-14 day precipitation probability forecasts have us outlooked for above average rainfall from August 26th through September 3rd.



The long range temperature probability has us outlooked for a continuation of above average temperatures overall from August 26th through the 30th then normal temperatures overall from August 28th through September 3rd.



Here is my 7 day forecast:


Today: Sunny skies High: 87 (83 Lakefront)


Saturday: Sunny skies Low: 66 High: 89


Sunday: Partly to mostly sunny Low: 68 High: 88


Monday: Partly to mostly sunny Low: 69 High: 90


Tuesday: Mostly sunny Low: 70 High: 91


Wednesday: Mostly sunny Low: 70 High: 92


Thursday: Mostly sunny Low: 70 High: 92

#ilwx

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