Metro Detroit weather: Great Thursday, but storm threat approaches

Thursday highs in low 80s

Metro Detroit weather: Great Thursday, but storm threat approaches, June 17, 2021, noon update
Metro Detroit weather: Great Thursday, but storm threat approaches, June 17, 2021, noon update

DETROITToday’s sunrise was at 5:56 a.m.

Our Thursday started off on a great note, and it’ll be a great day ahead with mostly sunny skies and highs rebounding into the low to mid 80s. Humidity will remain low, and we’ll have a south wind moving at 5 to 10 mph.

Today’s sunset is at 9:12 p.m.

Thursday evening looks super for whatever after-dinner plans you may have.

Then clouds will increase overnight and we have a thunderstorm chance late at night.

Thursday night storm chance

A special kind of thunderstorm cluster called a mesoscale convective system (MSC) that will develop Thursday night west of Michigan, and then track eastward or east-southeastward. Three of four high-resolution computer models suggest that the best potential for severe weather -- primarily damaging wind gusts -- will be south of the state line, but this remains a very close call so I strongly urge you to make sure your weather radio is set before you go to bed -- especially if you are south of M-59/Hall Road/Highland Road.

Temperatures Thursday night will only drop into the mid 60s as the humidity starts to creep back up. A south wind will blow at 5 to 10 mph.

Break Friday morning, then more rain

Once the showers and thunderstorms end Friday morning, we’ll get a break with partly cloudy skies developing. It will become noticeably humid, which, combined with highs reaching the mid to upper 80s, means it will be an uncomfortable day for those without air conditioning.

A cold front will approach Friday evening, so scattered thunderstorms will pop by late afternoon Friday and continue into Friday evening. There still remains some uncertainty regarding the severe threat with these storms, as there are some meteorological parameters strongly favoring strong storms, but some factors arguing against them. Friday morning’s upper air data, as well as a better estimate of the front’s timing, will help nail this down. So the prudent thing to remember is to frequently check our app’s real-time radar if you have outdoor plans later Friday into Friday evening.

Holiday weekend forecast

Storms should end before dawn Saturday, with lows in the mid 60s ... but it will take a while to reach this temperature, as the humidity will be around at least through the first half of the Friday night, if not longer.

As long as that cold front moves through Friday night, Saturday should be partly cloudy to mostly sunny, with less humidity and highs in the mid 80s -- what a day for Juneteenth celebrations, Father’s Day weekend and Royal Oak’s Rock ‘n’ Rides!

Saturday night will be mostly clear with comfy lows in the upper 50s.

Sunday, Father’s Day, will be mostly sunny to partly cloudy with highs in the mid to upper 80s. A warm front will cross the area during the day and, right now, I don’t expect any rain to come with it. But, you know what I always say: Never trust a warm front.

I’ll be monitoring the situation. Stay tuned!

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About the Author:

Local 4 meteorologist Paul Gross was born in Detroit and has spent his entire life and career right here in southeast Michigan. Paul has researched, written and produced eight half-hour documentaries for WDIV, as well as many science, historical and environmental stories.