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Natural hazards · Walnut

Walnut, IA natural hazards

Most of the natural-hazard damage FEMA expects in Walnut comes from inland flooding, and overall the risk is moderate for a U.S. community. 7 federal disasters brought FEMA money into town.

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

How exposed is Walnut?

57
Moderate
vs. U.S. communities

FEMA expects yearly storm and flood damage to homes and buildings in Walnut to be higher than in 57% of U.S. communities, mostly from inland flooding and tornadoes.

Inland flooding38%Tornadoes25%Hail10%Drought8%Strong wind7%Cold waves7%Everything else6%
By hazard

What Walnut faces

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

Inland flooding

38% of expected damage
Above average · higher than 59% of U.S. places
Recorded about once a year in the area

Tornadoes

25% of expected damage
Well above average · among the top 1% of U.S. places
Recorded about once every 12 years in the area

Hail

10% of expected damage
Well above average · higher than 92% of U.S. places
Recorded about 6 times a year in the area

Drought

8% of expected damage
Recorded about 9 times a year in the area

Strong wind

7% of expected damage
Well above average · higher than 93% of U.S. places
Recorded about 5 times a year in the area

Cold waves

7% of expected damage
Above average · higher than 73% of U.S. places
Recorded about 5 times a year in the area

Lower here

Ice stormsWinter weatherHeat wavesWildfireEarthquakesLandslidesLightning

Not a risk here

Coastal floodingHurricanesAvalanchesTsunamisVolcanic 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 Walnut flood?

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

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

7 federal disasters brought FEMA money here

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

Brought FEMA money into WalnutDeclared for Pottawattamie County only
2019

Severe Storms and Flooding

2 households applied for aid $5K aid approved
2010

Severe Winter Storm

$4K to the City of Walnut for repairs
2009

Severe Winter Storms and Snowstorm

$3K to the City of Walnut for repairs
2008

Severe Storms, Tornadoes, and Flooding

1 household applied for aid
2007

Severe Storms, Flooding, and Tornadoes

19 households applied for aid $18K aid approved $40K to the City of Walnut for repairs
2007

Snow

$3K to the City of Walnut for repairs
2004

Severe Storms, Tornadoes, and Flooding

2 households applied for aid $68 aid approved
Pottawattamie County has had 24 natural disasters declared since 1953, most often severe storms and floods.
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. Walnut is smaller than a census tract, so it shares the figures of the tract around its center.
Money that reached townFlood claims are matched to Walnut’s own flood-insurance community; household aid to the registrant’s city; repair grants to the City of Walnut. FEMA’s model follows property values, so a place that recently lost many homes can rate lower than it feels.

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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