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Natural hazards · South Lyon

South Lyon, MI natural hazards

Most of the natural-hazard damage FEMA expects in South Lyon comes from inland flooding, and overall the risk is very low for a U.S. community. 6 federal disasters brought FEMA money into town.

FEMA National Risk Index, December 2025 · OpenFEMA claims, aid & declarations
Expected damage

How exposed is South Lyon?

19
Very low
vs. U.S. communities

FEMA expects yearly storm and flood damage to homes and buildings in South Lyon to be higher than in 19% of U.S. communities, mostly from inland flooding and tornadoes.

Inland flooding42%Tornadoes32%Cold waves16%Everything else10%
By hazard

What South Lyon faces

Each hazard’s share of the damage FEMA expects here, and how that compares with the rest of the country.

Inland flooding

42% of expected damage
Below average · higher than 27% of U.S. places
Recorded about once a year in the area

Tornadoes

32% of expected damage
Well above average · higher than 91% of U.S. places

Cold waves

16% of expected damage
Above average · higher than 52% of U.S. places
Recorded about 3 times a year in the area

Lower here

HurricanesHailIce stormsWinter weatherHeat wavesWildfireEarthquakesLandslidesStrong windLightning

Not a risk here

Coastal floodingDroughtAvalanchesTsunamisVolcanic activity
Flood risk changes street by street. Check a specific address on FEMA’s flood map, and ask about flood insurance before you buy.
Flood insurance claims

Does South Lyon flood?

FEMA's records show no paid flood insurance claims in South Lyon.

of homes in flood zones
are insured
of all homes
are insured
No community discount. South Lyon isn’t in FEMA’s Community Rating System, which cuts flood insurance up to 45% in towns that do extra flood-proofing.
Insurance rates: Oakland County.
Disasters that hit South Lyon

6 federal disasters brought FEMA money here

Disasters the President declared that paid out in South Lyon itself: aid to households, or repair grants to the City of South Lyon.

Brought FEMA money into South LyonDeclared for Oakland County only
2023

Severe Storms, Tornadoes, and Flooding

99 households applied for aid $107K aid approved
2021

Severe Storms, Flooding, and Tornadoes

7 households applied for aid
2014

Severe Storms and Flooding

4 households applied for aid $714 aid approved
2004

Severe Storms, Tornadoes, and Flooding

3 households applied for aid $758 aid approved
2000

Snow

$13K to the City of South Lyon for repairs
1999

Mi - Severe Weather 1/2 /99

$8K to the City of South Lyon for repairs
Oakland County has had 12 natural disasters declared since 1953, most often severe storms and floods.
Around South Lyon

South Lyon and the towns around it

Lyon: Very low, mostly inland floodingGreen Oak: Low, mostly inland floodingMilford: Low, mostly inland floodingWixom: Very low, mostly tornadoesNovi: Very low, mostly inland floodingSalem: Very low, mostly inland floodingHamburg: Low, mostly inland floodingBrighton: Low, mostly inland floodingBrighton: Very low, mostly inland floodingNorthfield: Low, mostly inland floodingSouth Lyon: Very low, mostly inland flooding South LyonLyonGreen Oak
Very lowLowModerateHighVery high
Green Oakmostly inland floodingLow
South Lyonmostly inland floodingVery low
Lyonmostly inland floodingVery low
About these numbers

How to read this page

An average, not a forecastFEMA’s National Risk Index estimates the damage 18 kinds of natural hazards cause in a typical year, from decades of records and models. A quiet decade can follow a bad year.
Compared by rate“Higher than N%” compares yearly damage as a share of what’s here, so a big city isn’t rated riskier just for having more buildings. South Lyon covers 3 census tracts, combined by population.
Money that reached townFlood claims are matched to South Lyon’s own flood-insurance community; household aid to the registrant’s city; repair grants to the City of South Lyon. FEMA’s model follows property values, so a place that recently lost many homes can rate lower than it feels.

FEMA’s expected losses across South Lyon total about $3.2M a year, counting buildings, people and crops.

Sources: FEMA National Risk Index (December 2025); OpenFEMA: NFIP redacted claims, multiple-loss properties, community status book and residential penetration rates, housing assistance (owners and renters), public assistance funded projects, hazard mitigation properties and disaster declarations. Census tracts: U.S. Census Bureau.

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Boundary source: https://tigerweb.geo.census.gov/arcgis/rest/services/TIGERweb/Places_CouSub_ConCity_SubMCD/MapServer/18 · 2025-01-01
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