How Many Severe Storms Hit Macomb County in a Typical Year?

Ask a homeowner how many severe storms hit Macomb County in a typical year and you will hear a guess. Ask an insurance actuary and you will get a database query. The NOAA Storm Events Database logs severe weather in the United States county by county, event by event, with dates, times, and measurements where they exist. Thunderstorm wind, hail, and tornado entries can all be pulled for Macomb County specifically. That means the question in this note's title is not a matter of opinion, and neither is the conclusion it points to: a roof here is not specified against one bad day. It is specified against a documented annual diet.

01 /What counts as a severe storm on the federal ledger

The word severe has a definition. The National Weather Service classifies a thunderstorm as severe when it produces wind gusts of 58 mph or greater, hail 1 inch in diameter or larger, or a tornado. Anything below those thresholds, however loud and dramatic, does not make the severe ledger. That means every entry in the county's severe record represents weather that has already crossed the line where asphalt shingles start to lose. Wind ratings on standard shingles begin failing in exactly the gust range where the severe category begins, and 1 inch hail is the commonly cited threshold where bruising to the shingle mat becomes a live question, a subject we cover in our note on the hail size that starts damaging roofs.

02 /What the Macomb County counts look like

Here is where this note holds itself to the standard we would demand of any contractor quoting statistics at a kitchen table: no number gets printed without the database entry behind it. The specific annual figures belong here, pulled directly from the county query: (see NOAA's Storm Events Database). What can be said without qualification is the shape those counts take, because it is the same shape severe records show across southeast Michigan. Thunderstorm wind reports dominate the ledger, arriving multiple times in a typical warm season. Hail entries come in second, most of them small, with the roof damaging sizes appearing at longer intervals. Confirmed tornadoes are the rare line item, the one that makes the news, and we keep separate notes on the county's tornado history and its hail history for readers who want those ledgers in full.

The proportions matter more than the totals. If you think of severe weather as tornado sirens, you will check your roof once a decade. If you read the ledger the way an actuary does, you see that the workhorse threat is straight line thunderstorm wind, the least cinematic entry on the list and the one that shows up year after year after year. It does not take the roof off. It creases tabs, breaks sealant bonds, and scours granules, a few shingles at a time, every season.

03 /Reading the record like an actuary, not a headline

An actuary does not ask whether a severe storm will cross Macomb County. The record already answers that; they arrive on a schedule loose enough to feel random and tight enough to price policies on. The better questions are the ones the ledger forces: how many severe wind events will a 20 year old roof have absorbed over its life, and how many of them found a tab that never resealed after the one before? This county already carries a federal exhibit for what the top of the range looks like. The August 2023 storms damaged Macomb County severely enough that FEMA issued major disaster declaration DR-4757 covering the county, and homeowners are still discovering slow damage from that event years later. For how single reports are read, and how a storm becomes a federal disaster, see our companion notes on reading NWS storm reports and how storms become disasters.

Read that way, the frequency record stops being trivia and becomes a maintenance argument. A roof in a county with this severe weather diet should be inspected after documented events, not on a calendar habit, because damage compounds. A creased tab from one June gust is the leak path a February ice dam exploits.

04 /What the frequency record means for your roof

Three practical conclusions. First, after the next severe report that names your part of the county, get eyes on the roof; we inspect for free across Macomb County, at no cost or obligation, and you get photos either way. Second, catch damage while it is a repair, because repairs run $350 to $3,200 (larger or complex repairs can run higher), a fraction of what the same neglected damage becomes. If a documented storm caused it, our storm damage and insurance claims guide walks the process and we can meet your adjuster on site; no contractor can promise what a carrier approves, but a complete file helps. Third, if the roof is old enough that the ledger has already had its way with it, the 60 second cost calculator puts an honest range on replacement, and the storm damage service page and guides library cover the rest. The severe record is public and it is not going to shrink. The free inspection is how you find out what it has cost your roof so far.