NatHaz Toolkit: Manage Threat of Natural Hazards

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Flood

High

High Hazard (Pink) High hazard flood zones have at least a 1% annual chance of flooding to the shown footprint and are commonly referred to as 100-year flood zones

Moderate

Moderate Hazard (Yellow) Moderate hazard flood zones have at least a 0.2% annual chance of flooding to the shown footprint and are commonly referred to as 500-year flood zones.

Earthquake

50-year (Indigo) A ≥ 2% annual probability of damaging earthquake ground motion. This represents a Severe relative risk.

100

100-year (Red) A 1 to 2% annual probability of damaging earthquake ground motion. This represents a High relative risk.

250

250-year (Orange) A 0.4 to 1% annual probability of damaging earthquake ground motion. This represents a Moderate relative risk.

500

500-year (Green) A 0.2 to 0.4% annual probability of damaging earthquake ground motion. This represents a Moderate relative risk.

>500

>500-year (White) A < 0.2% annual probability of damaging earthquake ground motion. This represents a Low relative risk.

No Data

No Data (Striped)

Hail (U.S. only)

Moderate

Moderate (Green) The Moderate hail zone is based on an equivalent hail size of ≤ 1.75 in. (44mm) over a 15-year return period.

Severe

Severe (Pink) The Severe hail zone is based on an equivalent hail size of > 1.75 in. (44mm) and ≤ 2 in. (51mm) over a 15-year return period.

Very Severe

Very Severe (Dark Pink) The Very Severe hail zone is based on an equivalent hail size of > 2 in. (51mm) over a 15-year return period.

Freeze

100-Year Daily Minimum Temperature

> 20°F / -6.7°C

20°F / -6.7°C

15°F / -9.4°C

10°F / -12.2°C

5°F / -15°C

0°F / -17.8°C

-5°F / -20.6°C

-10°F / -23.3°C

-15°F / -26.1°C

-20°F / -28.9°C

-25°F / -31.7°C

-30°F / -34.4°C

-35°F / -37.2°C

-40°F / -40°C

-45°F / -42.8°C

-50°F / -45.6°C

-55°F / -48.3°C

-60°F / -51.1°C

-65°F / -53.9°C

-70°F / -56.7°C

-75°F / -59.4°C

≤ -80°F / -62.2°C

About NatHaz Maps

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