Severe storms resulted in numerous reports of wind damage.
Every event with a place to put it. Tap one for its entry below.
Deaths and injuries are direct and indirect together, as the offices filed them. Damage is property and crops in the dollars of the year, not adjusted for inflation, and only where an office estimated it.
The episode as NWS GRR wrote it up.
Severe storms resulted in numerous reports of wind damage.
The local office's own words before the first event, as it sent them, from the Iowa Environmental Mesonet's archive of National Weather Service text.
NWS Grand Rapids, MI wrote its last area forecast discussion before the first event at Aug 24, 2:15 PM EST, 45 minutes earlier.
Area Forecast Discussion National Weather Service Grand Rapids MI 315 PM EDT Tue Aug 24 2021 LATEST UPDATE... Synopsis/Discussion/Marine .SYNOPSIS... Issued at 315 PM EDT Tue Aug 24 2021 - Uncertain convective evolution tonight and Wednesday - Multiple chances of storms Thursday through Sunday night - Cooler and less humid early next week && .DISCUSSION...(This evening through next Tuesday) Issued at 315 PM EDT Tue Aug 24 2021 -- Uncertain convective evolution through Wednesday -- The first order of business is the line of showers and storms out over Lake Michigan and East Central Wisconsin. The line has been trying to hold its own as it moves to the East, although it has weakened considerably over the last couple of hours. Obviously, the lake has helped to weaken it a bit. The other factor is that the 0-3 km shear vectors are oriented from SW to NE. This is parallel to most of that line, except for the very northern edge which is over the cooler lake. This will limit the threat of severe winds with it. We will need to monitor it as it comes onshore and encounters a little better instability. It is around 1,000 J/kg up toward Ludington, much less than further south in the warm sector. Elsewhere, we can not rule out a pop up storm or two with peak heating. CAPEs are as high as 3,000+ J/kg with the heat and high dew points in place. DCAPEs over 1,000 J/kg will support an isolated wind threat, and thick -10 to -30C CAPE and mid level lapse rates around 7.0 C/km will support a large hail threat. Deep layer shear values continue to be limited here, which will limit the severe threat some. Another threat of storms will come tonight and into early Wednesday. A low level jet that will ramp up over Wisconsin this evening will support additional convection over there. We eventually see the eastern flank of this low level jet move in later tonight and Wednesday morning. It will not be ideal for organized convection as by the time the moisture transport arrives, it will be diminishing in strength. This will limit the severe potential for our area. The bigger threat will be locally heavy rainfall with precipitable water values around 2 inches. We do not see a widespread flooding event as the low level jet will be progressing east. It would be more localized in nature. This should be pushing out of the area by early afternoon. -- Multiple chances of storms Thursday through Sunday night -- The threat for storms will continue for Wednesday night and Thursday, although it does not look likely at this time. We will remain in the very warm and humid air until later Thursday as the front will finally sink south through the entire area. For this period, there does not look to be a good signal of an organized wave or low level jet to help organize convection. The break in the threat for storms looks to short lived, as the next feature could spark storms late Thursday night into Friday morning. The front will be trying to move back north as a warm front as the next wave ramps up the low level jet. Where the fronts at the surface and aloft end up as the low level jet develops will dictate where exactly the additional development takes place. The favored area for storms will be further north and west, closer to the nose of the low level jet. This could end up riding SE along the boundary. This low level jet does persist in some form through Friday, likely focused on Northern Lower and Upper Michigan. There will be a chance of showers and storms Friday night through early Sunday, but widespread convection is not expected. We will be mostly in the warm sector, with the warm front to our north, and the cold front well to our west. A better organized threat for storms will come late on Sunday as the cold front and supporting upper wave approach the area later in the day. Timing of this is a bit uncertain out 5 days, but there is some potential that the timing could be conducive for severe weather. Wind fields aloft will become more favorable with the arrival of the wave, helping the cause for some possible organization. -- Cooler and less humid early next week -- At this time, the cold front looks like it should be through the area by sunrise on Monday. Cooler and drier air will be filtering into the area for Monday and Tuesday. This could be short lived as return flow may be setting up just after this period and advecting warm and humid air back over the area. && .AVIATION...(For the 18Z TAFS through 18Z Wednesday afternoon) Issued at 153 PM EDT Tue Aug 24 2021 Low confidence in tstm potential and timing over the next 24 hours. The storms currently moving east from WI, or new storms triggered from their outflow, may impact the TAF sites later this afternoon and evening so have include a 4 hr period of VCTS for this potential. If storms do end up impacting the terminals, brief IFR or low vsbys in heavy rain may occur along with a wind gust in excess of 30 kts. Beyond 06Z tonight into Wednesday, tstm potential will still exist. However given the low confidence will not include thunder in later periods until a risk is more apparent. There are a few MVFR cigs around early this afternoon but those should lift into VFR category in the next couple hours. && .MARINE... Issued at 315 PM EDT Tue Aug 24 2021 We do not anticipate needing any marine headlines (outside of thunderstorms) at least through Wednesday, and even maybe through the end of the week. Conditions will not be calm out on the waters over the next 2-3 days, but winds and waves do not look to be sustained long enough or high enough to need a Small Craft Advisory at this time. We could see some general winds approach 20 knots and some waves up to about 3 ft. We will have some increase in wind tonight with the low level wind max coming through, and again late Wed and/or Thu behind the front. Those winds will be strongest north of our area, and will be offshore in nature. && .GRR WATCHES/WARNINGS/ADVISORIES... MI...None. LM...None. && SYNOPSIS...NJJ DISCUSSION...NJJ AVIATION...Meade MARINE...NJJ
Hazardous Weather Outlook National Weather Service Grand Rapids MI 322 PM EDT Tue Aug 24 2021 MIZ037>040-043>046-050>052-056>059-064>067-071>074-250830- Mason-Lake-Osceola-Clare-Oceana-Newaygo-Mecosta-Isabella-Muskegon- Montcalm-Gratiot-Ottawa-Kent-Ionia-Clinton-Allegan-Barry-Eaton- Ingham-Van Buren-Kalamazoo-Calhoun-Jackson- 322 PM EDT Tue Aug 24 2021 This hazardous weather outlook is for portions of southwest Lower Michigan. .DAY ONE...This Afternoon and Tonight Thunderstorms will be possible through tonight. Severe storms are not likely, but some could become locally severe. The strongest storms will be capable of heavy rain, wind gusts to 60 mph, and large hail up around the size of a quarter. Hot and humid conditions this afternoon will push heat index values into the 90s to around 100. .DAYS TWO THROUGH SEVEN...Wednesday through Monday Thunderstorms will be possible each day from Wednesday through Sunday. Warm and humid conditions will persist into the weekend with heat index values rising into the 90s at times. .SPOTTER INFORMATION STATEMENT... Spotter activation is possible through tonight. LMZ844>849-250830- St Joseph to South Haven MI-South Haven to Holland MI- Holland to Grand Haven MI-Grand Haven to Whitehall MI- Whitehall to Pentwater MI-Pentwater to Manistee MI- 322 PM EDT Tue Aug 24 2021 This hazardous weather outlook is for portions of southwest Lower Michigan. .DAY ONE...This Afternoon and Tonight Thunderstorms will be possible through tonight. Severe storms are not likely, but some could become locally severe. The strongest storms will be capable of heavy rain, wind gusts to 60 mph, and large hail up around the size of a quarter. .DAYS TWO THROUGH SEVEN...Wednesday through Monday Thunderstorms will be possible each day from Wednesday through Sunday. .SPOTTER INFORMATION STATEMENT... Spotter activation is possible through tonight. DUKE NJJ
PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE GRAND RAPIDS MI
356 PM EDT TUE AUG 24 2021
..TIME... ...EVENT... ...CITY LOCATION... ...LAT.LON...
..DATE... ....MAG.... ..COUNTY LOCATION..ST.. ...SOURCE....
..REMARKS..
0330 PM TSTM WND GST 6 W LUDINGTON 43.95N 86.55W
08/24/2021 M43 MPH LMZ868 MI BUOY
BUOY 45024 5 W LUDINGTON.
&&
JSKThe Grand Rapids radar (KGRR), 133 km away, was scanning. The volume nearest the first event began at 19:59 UTC.
6 thunderstorm wind. Local standard time, as filed.
Several trees were blown down along US-31.
Several trees were blown down.
The public reported that several trees were blown down near US-131.
Numerous downed tree limbs and power outages were reported along M-91 between Greenville and Turk Lake.
Isolated tree damage was reported.
A trained spotter reported a severe storm wind gust of around 60 mph.
After NWS Directive 10-1605, the rules offices file Storm Data by.
Every storm in Michigan in 2021Every state in 2021This day in weather historyWarnings in Michigan, August 2021
NOAA National Centers for Environmental Information, Storm Events Database, compiled from the National Weather Service’s monthly Storm Data. Complete through 2026-06; NCEI adds each month about 75 days after it ends and revises past years a few times a year. Rebuilt 2026-09-24. Each event’s entry at NCEI: 973852, 973853, 973854, 973855, 973856, 973857.