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  • Tim McGill

Deja Vu All Over Again

If you liked yesterday then you'll like today and chances are you'll like tomorrow too. Tuesday's high of 86° at O'Hare was 8° above average. It was the first day above average after three straight days below average. Highs today should climb into the middle to upper 80s with the help of plenty of sunshine. A wind off the lake will keep it cooler lakeside with highs there in the middle to upper 70s.

The hourly forecast for O'Hare has highs near 90° Thursday and 90° on Friday. As the heat builds the humidity will build a bit too but never to oppressive levels. Dew points climb from the comfortable middle 50s to the slightly muggy lower 60s by Friday. The heat index never climbs much above the air temperature through the end of the week.

The pattern we are in with a ridge of high pressure controlling our weather the next few days means there isn't a lot of mixing going on in the atmosphere. Pollutants will build in this stagnant air. For that reason an air quality alert is in effect for most areas until midnight.

Here are more details from the National Weather Service:

An air pollution action day is declared when weather conditions are such that widespread ozone and or particulate levels are expected to be at or above the unhealthy for sensitive groups category of the air quality index. Active children and adults especially people with pulmonary or respiratory disease such as asthma should limit prolonged outdoor activity.

It should remain dry through most of the rest of the week. An unsettled pattern settles in for the weekend and early next week though. Periods of showers and thunderstorms could begin as early as late Friday. The highest chance of rain comes late Saturday into early Sunday and then again on Monday.

Rainfall for the month of June is down about 1.14" below average. We could make up much of that deficit this weekend according to the GFS model. The total precipitation accumulation forecast through Sunday afternoon suggests a half inch to an inch and a quarter of rain could fall in total across northern Illinois and Indiana.

The longer range 6-10 day temperature probability forecast has us outlooked for below average temperatures overall from June 22nd through the 26th. We flip back to above average overall temperatures in the 8-14 day forecast for June 24th through the 30th.

It appears that June could end on a warmer than average note and July could start off that way too. The multi-ensemble model forecast for the week ending on July 10th has most of the midwest (and country for that matter) above average overall for the start of next month.

Here is my 7 day forecast:

Today: Sunny skies, very warm High: 87 (76 Lakefront)

Thursday: Sunny skies, hot Low: 65 High: 88 (82 Lakefront)

Friday: Partly to mostly sunny, hot, sct. t-storm late? Low: 68 High: 91 (86 Lakefront)

Saturday: Partly to mostly cloudy, sct. showers & t-storms Low: 70 High: 85

Sunday: Shower/t-storm possible early, partly cloudy Low: 68 High: 85 (82 Lakefront)

Monday: Partly cloudy, sct. showers & t-storms Low: 66 High: 83

Tuesday: Partly cloudy, sct. showers & t-storms Low: 63 High: 80



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