There were several reports of downed trees and limbs in far southwest lower Michigan during the early morning hours of August 6th.
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.
There were several reports of downed trees and limbs in far southwest lower Michigan during the early morning hours of August 6th.
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 6, 5:41 AM EST, 1 hour 9 minutes earlier. Its key messages:
Area Forecast Discussion National Weather Service Grand Rapids MI 641 AM EDT Tue Aug 6 2024 .KEY MESSAGES... - Showers and Storms Likely Today - Dry Weather Favored Wednesday through Friday - Scattered Showers Possible Over the Weekend && .DISCUSSION... Issued at 219 AM EDT Tue Aug 6 2024 - Showers and Storms Likely Today Scattered showers and storms are ongoing this morning with more widespread activity arriving in the next few hours as a decaying squall line exits Wisconsin fed by the low level jet. The primary concern is locally heavy rainfall. PWAT values of 1.5-2 inches this morning and enhanced forcing from a mid-level FGEN axis are the meteorological drivers. Currently the heaviest rainfall is forecast south of M20. Widespread rainfall of 1-2 inches is expected with locally higher amounts possible in training storms or areas of better rainfall efficiency. The HREF LPMM supports this with isolated pockets of 3+ inches across the CWA. In terms of flooding, rivers should remain below flood stage though a few more responsive streams may make a run at action stage. Overall, lower soil moisture content suggests areal flooding will not be widespread. However localized flooding is possible and flood advisories may be needed for areas with the heaviest rainfall, especially in our urban areas. A low threat of gusty winds exists given high PWATs and deep layer shear of 30+ knots. Main concern is near to shortly after sunrise as the low-level inversion around 2kft weakens, mainly near I94 where around 1000 joules of CAPE builds in. Overall the threat is low given the elevated nature of any storms, but not zero so we'll be watching these storms as they move through. Rain chances slowly diminish after 18z Tuesday and dry conditions are expected for Wednesday as high pressure moves into the area. - Dry Weather Favored Wednesday through Friday Still favoring a dry forecast for the mid to late week period. Dry northeastly low level flow will be in place Wednesday into Thursday. Highs in the upper 70s are expected along with low humidity. Medium range guidance is pushing a cold front through the region Thursday night into Friday, though temperatures won't immediately feel much cooler yet. Currently NBM POPs are only about 10% with this front, so will keep mention of rain out of the forecast for now. - Scattered Showers Possible Over the Weekend Will introduce some scattered showers into the forecast for the weekend, mainly from I-96 to the north. ECE/GEFS ensemble mean 500 mb heights over the weekend show deep upper troughing along with cooler than average 850 mb temperatures as low as 8C. ECE probability for 0.01" or more, a good proxy for measurable rain, is higher than one would expect at 60-90% for areas along and west of US 131 (and north of I-96) Saturday into Sunday. The 24hr QPF chiclet chart for LDM shows the vast majority of members producing light showers. While not a washout, the likelihood for some scattered rain showers in a cold air advection regime seems to be going up a bit for the weekend period. NBM POPs are 20-30% at this time, which seems reasonable, though higher POPs may eventually be introduced as medium range guidance clarifies the depth of upper troughing. Highs will likely max out in the 70-75 range, possibly upper 60s along the lakeshore. && .AVIATION /12Z TAFS THROUGH 12Z WEDNESDAY/... Issued at 635 AM EDT Tue Aug 6 2024 Overall forecast remains the same, with mainly minor refinement of timing based on radar trends. Given the robust cell over southern Lake Michigan have added TSRA at BTL and AZO. Thunderstorms will impact all terminals through 15-16z. Gusts of 20-30 knots are possible in heavier storms, and gusts above 40 knots cannot be ruled out if the storms over the lake hold together. Cigs will fall to IFR with IFR and lower visbys as these thunderstorms roll through. Cigs will be slow to improve, not climbing until late afternoon into the evening. && .MARINE... Issued at 219 AM EDT Tue Aug 6 2024 A weakening squall line will move across the waters over the next few hours. Cloud to water lightning is likely and locally higher winds and waves are possible. Increased easterly winds are likely behind this line with gusts to around 25 knots. Will be issuing a Small Craft Advisory for all nearshore zones from 09z today to 06z Wednesday for the gusts. Easterly winds keep flow offshore so waves are not expected to be hazardous to small craft/no Beach Hazards Statement is needed. After this, hazards not expected for the rest of the work week. && .GRR WATCHES/WARNINGS/ADVISORIES... MI...None. MARINE...Small Craft Advisory until 2 AM EDT Wednesday for LMZ844>849. && DISCUSSION...Hoving/Thomas AVIATION...Thomas MARINE...Thomas
Hazardous Weather Outlook...CORRECTED National Weather Service Grand Rapids MI 235 AM EDT Tue Aug 6 2024 MIZ037>040-043>046-050>052-056>059-064>067-071>074-070645- Mason-Lake-Osceola-Clare-Oceana-Newaygo-Mecosta-Isabella-Muskegon- Montcalm-Gratiot-Ottawa-Kent-Ionia-Clinton-Allegan-Barry-Eaton- Ingham-Van Buren-Kalamazoo-Calhoun-Jackson- 235 AM EDT Tue Aug 6 2024 This hazardous weather outlook is for portions of southwest Lower Michigan. .DAY ONE...Today and Tonight Thunderstorms are expected through this afternoon. Widespread rainfall of 1-2 inches is likely with locally higher totals possible. Nuisance flooding is possible in spots. A low chance of damaging wind gusts exists near and south of I94 near sunrise through early afternoon. .DAYS TWO THROUGH SEVEN...Wednesday through Monday Hazardous weather is not expected at this time. .SPOTTER INFORMATION STATEMENT... Spotter activation may be needed through this afternoon. LMZ844>849-070645- 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- 235 AM EDT Tue Aug 6 2024 This hazardous weather outlook is for portions of southwest Lower Michigan. .DAY ONE...Today and Tonight Thunderstorms with heavy downpours and frequent cloud to water lightning are likely through this afternoon. Locally higher winds and waves are possible with any storms. Winds will be hazardous to small craft from early Tuesday morning to early Wednesday morning. .DAYS TWO THROUGH SEVEN...Wednesday through Monday Hazardous weather is not expected at this time. .SPOTTER INFORMATION STATEMENT... Spotter activation may be needed through this afternoon.
Preliminary Local Storm Report
National Weather Service Grand Rapids MI
719 AM EDT Tue Aug 6 2024
..TIME... ...EVENT... ...CITY LOCATION... ...LAT.LON...
..DATE... ....MAG.... ..COUNTY LOCATION..ST.. ...SOURCE....
..REMARKS..
0650 AM Tstm Wnd Gst 42 W Douglas 42.67N 87.03W
08/06/2024 M51 MPH LMZ876 MI Mesonet
Mesonet station 45007 Southern Lake Michigan
Buoy.
&&
ThomasPreliminary Local Storm Report
National Weather Service Grand Rapids MI
746 AM EDT Tue Aug 6 2024
..TIME... ...EVENT... ...CITY LOCATION... ...LAT.LON...
..DATE... ....MAG.... ..COUNTY LOCATION..ST.. ...SOURCE....
..REMARKS..
0736 AM Tstm Wnd Gst 2 ESE Hartford 42.19N 86.13W
08/06/2024 M40 MPH Van Buren MI Mesonet
Mesonet station MC162 I-94 Mile Marker 47.7.
&&
ThomasThe Grand Rapids radar (KGRR), 86 km away, was scanning. The volume nearest the first event began at 11:47 UTC.
3 thunderstorm wind. Local standard time, as filed.
Law enforcement reported that several large trees and limbs were blown down near Lawrence, Decatur and Lawton.
Several trees were blown down near Allegan.
Several trees were blown down near Schoolcraft.
After NWS Directive 10-1605, the rules offices file Storm Data by.
Every storm in Michigan in 2024Every state in 2024This day in weather historyWarnings in Michigan, August 2024
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: 1212824, 1212825, 1212826.