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Excessive Heat Watch

Posted on by MichaelV (Otsego)

 

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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Category: Michigan Weather Forecast

33 thoughts on “Excessive Heat Watch”

  7. Hey Folks Long Time No Cue. Hope You all are Having A Nice Summer.
    Been Really Busy Lately Running Back and Forth To Doctors in GR.
    Looks Like a Real Bonfid Heat WAAVVEE on Tap. Stay Cued For Some FRYday Morning HOT TUNES or CUES. PEACE!!

  9. Hopefully a few “summer days” are on the horizon. We’ll have to cobble together the few we receive this year, to determine wether or not it amounts to a summer. Fingers crossed for summer weather.

  10. WOOD says get ready. The Excessive Heat Watch is expected to be upgraded into an Excessive Heat Warning soon.

    1. So if we get the 110 heat index they are saying that only happens 0.02% of the time in Grand Rapids in the summer. Woah!

  12. This is what INDY calls a heat wave 95* or better as the eye can see on a weather map this could be one for the records hold on yeaaaa!! INDYDOG14!!

  13. Latest GFS runs has 95-100 degrees for Lower Michigan for July 4th, 5th, and 6th. Wow!

  14. Mookie this weekend is for you bud! Don’t forget the sun screen! Anybody wants to join me going to Holland beach tomorrow stay cool INDYDOG14!!

    1. Going for more 90 degree days we have seen in awhile. One word “Hot”. It’s summer and this year it’s been hot.

    2. Woah! What happened to it just being a “2-3 day heat wave” as some were calling it?

  16. While we are faced with the upcoming heat wave just to cool you off here is a look back at this past April when the Midwest was having one of its coldest April’s on record. Here in lower Michigan this is how April 2018 ended up.
    The only location not in the top ten was Detroit. Here is the ranking of April 2018 across Southern lower Michigan
    Detroit 13th coldest
    Flint 1st coldest
    Saginaw 2nd coldest
    Grand Rapids 4th coldest
    Lansing 8th coldest
    Muskegon 3rd coldest
    All rankings are per the NWS
    Slim

  17. “As for how hot it gets, we are in a classic position with the building upper high. The 1000/925 thickness forecast from the NAM, which typically does very well with those numbers would suggest highs near 100 degrees.” NWS GRR

  18. One has to wonder just how humid it will become this weekend. Off to our SW the current DP’s are very high. In Missouri the DP now ranges from 70 to 79 in southern Illinois it is 72 to 79 in western Kentucky it is also 72 to 79 and in Iowa it is 70 to 79. Here in Michigan it is in the mid to upper 60’s in the south to upper 50’s to low 60’s to the north.
    Slim

  19. I am not sure how many “Heat waves” Grand Rapids has had over the years. Back in the 1930’s there were several that stand out but it was dry in those years so the humidity may have been lower. Of course we have no idea as to how long this hot period will last but in the recent past in 2013 Grand Rapids had a 7 day “heatwave” from July 14th to the 20th when highs were 91,95,93,95,96 and 88. In the very hot July of 2012 Grand Rapids had 2 hot heat waves the first one was from June 27th until July 9th with highs of 90,97,89,89.91,96,96,99,101,104,99. There was a “break” on the 10th when the high was still a warm 86 and then from July 11th to the 18th highs reached 89,90,94,91,97,99, and 91.
    Slim

  20. Only home 1 day and I miss the cool dry air out West already. The second we stepped off the plane in GR it was like trying to breathe under water, just thick, dense air. Feels just miserable, and only looks worse in the coming days. On the positive side, best trip ever for my wife and I to celebrate 25 years of marriage!

    2. Welcome back!! Congrats to you and your wife on 25 years of marriage.

    1. Not sure if the “official” reading will reach 100 but a lot of back yards will. Back in 2012 on the day the “official” high was 104 I had 109 and have several pictures that show it. I will post them may be on this weekends post
      Slim

    2. Nice call, Indy! A lot of people thought you were crazy when you said it might hit 100 in GR. Now it’s looking better and better.

  23. First Excessive Heat Watch in 6 years! WOOD now has 88, 92, 95, 90, 88, 89, 90, 88. Talk about a hot and humid next 8 days!

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