Know what’s close to home.

Modelled still-water depth at this exact point during a flood with a 1% chance of happening in any given year. Wave action is not included, and levees or seawalls are not modelled — this is the undefended hazard.

The intensity of short, extreme downpours — the driver of flash flooding away from any river. This is a rainfall measure, not modelled inundation: whether it actually floods also depends on paving, slope, soil, and how well the local storm drains are maintained.

Ground elevation relative to the local average high tide, for land that is hydraulically connected to the ocean. A screen for chronic tidal flooding and sea-level-rise exposure, not a storm-surge simulation.

The regulatory flood zone from FEMA’s National Flood Hazard Layer — the map that determines whether flood insurance is federally required and what it costs.

Annual burn probability from a model trained on observed burned area worldwide (2003–2023), using fire weather, climate, fuels, terrain and ignition sources. USFS FSim substitutes over the United States. Wildland probability is extended into adjacent wildland–urban interface pixels to represent structure exposure.

Peak 3-second gust at the 1% annual-chance level, from hurricanes and winter storms. Thunderstorm winds are counted separately under Derecho.

Annual chance of at least one EF2-or-stronger tornado within 25 miles, from 30 years of NOAA Storm Prediction Center records. US coverage only.

Frequency of derechos — long-lived thunderstorm complexes that produce damaging straight-line winds over hundreds of miles. This captures the thunderstorm wind that Extreme Wind leaves out. US coverage only, mostly east of the Rockies.

Annual probability of very large hail (5 cm / 2 in or bigger), from a statistical hail model applied to 70+ years of reanalysis and calibrated against European, US and Australian hail reports.

Annual hours with thunder detected nearby, from a satellite-calibrated global lightning dataset. A broad proxy for thunderstorm activity rather than a site-specific strike probability.

Annual maximum air temperature at the 10% annual-chance level — roughly the hottest day you would expect once a decade.

Annual maximum wet-bulb temperature — heat and humidity combined into the measure that determines whether the body can still cool itself by sweating.

Annual minimum air temperature at the 10% annual-chance level — roughly the coldest night you would expect once a decade.

Peak ground acceleration with a 10% chance of being exceeded in 50 years, on firm rock. Combines USGS and other regional seismic hazard models. Soil amplification, liquefaction and tsunami are not included.

Relative landslide susceptibility from USGS slope–relief models trained on more than 600,000 documented US landslides and 10 m elevation data. A screening index, not a site-specific slope-stability analysis.

Estimated rate of vertical ground-surface lowering, mostly driven by groundwater pumping and sediment compaction. The source dataset omits urban areas, so it can be unavailable exactly where it matters.

A screening score for severe multi-year drought, based on how little precipitation the surrounding river basin has left during a 1-in-25-year dry spell, ranked against basins worldwide.

Annual cooling degree days — the cumulative amount by which daily temperature sits above the 65 °F balance point. A temperature-only proxy for cooling energy demand.

Annual heating degree days — the cumulative amount by which daily temperature sits below the 65 °F balance point. A temperature-only proxy for heating energy demand.