For myself anything over 80° is excessive when working outside unless the humidity is really low. Temperature is a pleasant 58° at 7am this morning but this is going to change as the NWS has declared an Excessive Heat Watch from Friday afternoon through Saturday.
An Excessive Heat Watch is issued by the National Weather Service of the United States when the heat index is expected to be greater than 105 °F across the northern states or 110 °F across the southern states during the day, and/or nighttime low temperature will be at least 75 °F or higher for two consecutive days.
Note that even with the usual northern/southern criteria, local offices, particularly those with deserts or mountainous terrain, often have their own criteria. High values of the heat index are caused by temperatures being significantly above normal and high humidities, and such high levels can pose a threat to human life through conditions such as heat stroke.
Temperatures will be on the increase starting today, with even hotter conditions expected for Friday and Saturday. Temperatures will be in the 80s today, with 90s likely away from Lake Michigan Friday and Saturday. Heat indices will be around 100 degrees on Friday, with over 100 degrees on Saturday. Dry conditions are expected until Sunday. I am seeing a projected low of 80° for Saturday night for Grand Rapids and mid to upper 70s for most of the rest of the area.
Temperatures will remain warm through most of next weeks with temperatures mainly in the low to mid 80s. Below are the projected temperature and dew points for the next 4 days from the NAM models. You can click to enlarge these.
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