Some patchy fog will be around during the morning hours as well for areas, so make sure to drive carefully.
Anyone overcome by heat should be moved to a cool and shaded location, and help for them should be sought by calling 911 immediately. Temperatures remain above average in the upper 80s and lower 90s with high heat index values.
But it felt hotter, with most heat indexes surpassing 100 degrees Friday.
The heat and humidity will create uncomfortable conditions, especially today.
There is a chance of thunderstorms Wednesday for July 4th. These factors along with an increase in high and mid-level clouds will all contribute to near-record high overnight temperatures again tonight, again providing no relief from the heat, especially in the Chicago "heat island".
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Even through we didn't have much in the ways of storms today. There could be some patchy valley fog but nothing that widespread or dense. Afternoon thunderstorm chances with current forecast guidance looks likely, but we'll be keeping an eye on it with more consistent model runs as we head into next week. The next several nights will feature low temperatures not getting below 70 degrees, so these nights will be very warm and sticky and ones where you'll want to have the windows closed and the AC on for sleeping. Heat index values as high as 100.
This weekend is so hot, that is can be downright risky; otherwise its great to enjoy water activities.
Wear lightweight, light-colored clothing. More heat is expected next week.
The hottest June 30 on record was in 1954 which saw a high of 99 degrees that day, Mott said. The air temperature in Rochester got to the low 90s on Saturday, with a 'heat index, ' a term reflecting how it feels with the humidity, topping 100 degrees. That will keep us in sunshine and heat with highs in the middle 90s.