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Natural hazards · Allison

Allison, IA natural hazards

Most of the natural-hazard damage FEMA expects in Allison comes from inland flooding, and overall the risk is high for a U.S. community. 4 federal disasters brought FEMA money into town.

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

How exposed is Allison?

78
High
vs. U.S. communities

FEMA expects yearly storm and flood damage to homes and buildings in Allison to be higher than in 78% of U.S. communities, mostly from inland flooding.

Inland flooding56%Drought15%Tornadoes12%Cold waves7%Strong wind6%Everything else5%
By hazard

What Allison faces

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

Inland flooding

56% of expected damage
Well above average · higher than 91% of U.S. places
Recorded about 3 times a year in the area

Drought

15% of expected damage
Recorded about 19 times a year in the area

Tornadoes

12% of expected damage
Well above average · higher than 92% of U.S. places
Recorded about once every 12 years in the area

Cold waves

7% of expected damage
Well above average · higher than 77% of U.S. places
Recorded about 10 times a year in the area

Strong wind

6% of expected damage
Well above average · higher than 96% of U.S. places
Recorded about 5 times a year in the area

Lower here

HurricanesHailIce stormsWinter weatherHeat wavesWildfireEarthquakesLandslidesLightning

Not a risk here

Coastal floodingAvalanchesTsunamisVolcanic 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 Allison flood?

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

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

4 federal disasters brought FEMA money here

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

Brought FEMA money into AllisonDeclared for Butler County only
2008

Severe Storms, Tornadoes, and Flooding

7 households applied for aid $11K aid approved $20K to the City of Allison for repairs
2007

Severe Winter Storms

$11K to the City of Allison for repairs
2004

Severe Storms, Tornadoes, and Flooding

5 households applied for aid $2K aid approved
1999

Severe Storms, Flooding, and Tornadoes

$6K to the City of Allison for repairs
Butler County has had 20 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. Allison 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 Allison’s own flood-insurance community; household aid to the registrant’s city; repair grants to the City of Allison. 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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