What Are Hurricanes and How Do You Assess Your Hurricane Risk?
A hurricane is a tropical cyclone with sustained winds of at least 74 mph (Category 1 on the Saffir-Simpson scale). You assess your own risk in two steps: check the hurricane and coastal flood rating for your county or neighborhood, then match your preparation to that rating and the storm category approaching. This applies to anyone living in or owning property along the U.S. Gulf and Atlantic coasts, Hawaii, and U.S. territories in the Pacific and Caribbean — inland counties still face the rainfall and tornado side of the same storms.
How a hurricane forms
Three conditions have to line up:
- Warm ocean water — roughly 80°F (27°C) or warmer down through the upper layers, which supplies the heat and moisture the storm feeds on.
- Moist, unstable air — rising warm air condenses into towering thunderstorms; the release of latent heat keeps the circulation going.
- Favorable wind shear — winds that do not change speed or direction much with height. Strong shear tears a developing storm apart before it can organize.
When these hold, a tropical disturbance can progress through tropical depression and tropical storm stages to hurricane. Once over cooler water or land, the storm loses its fuel and weakens.
Hurricane categories and what each one means
The Saffir-Simpson scale rates a storm by its maximum sustained winds. It does not rate storm surge, rainfall, or tornadoes — a slow-moving Category 1 can flood an area worse than a fast Category 3.
| Category | Sustained winds | Typical damage |
|---|---|---|
| 1 | 74–95 mph | Roof, shingle, and gutter damage; downed trees; power outages |
| 2 | 96–110 mph | Major roof and siding damage; shallow-rooted trees uprooted; near-total power loss |
| 3 | 111–129 mph | Structural damage to well-built homes; many trees down; electricity and water unavailable for days |
| 4 | 130–156 mph | Severe structural damage; most trees snapped or uprooted; areas uninhabitable for weeks |
| 5 | 157 mph or higher | High percentage of framed homes destroyed; prolonged isolation of residential areas |
The four hazards a hurricane actually delivers
Category tells you about wind. Your real risk usually comes from the other three:
- Storm surge — seawater pushed ashore by wind and low pressure. It is the leading cause of hurricane deaths in the U.S. and depends on the storm's size, angle of approach, and your local shoreline shape, not just its category.
- Heavy rain and freshwater flooding — slow-moving or stalled storms can drop feet of rain far inland, well outside the coastal evacuation zone.
- Wind — the direct structural threat, and the reason for most power outages.
- Tornadoes — hurricanes frequently spawn tornadoes in their outer rainbands, often with little warning.
How to check your hurricane risk
Augurisk's platform presents disaster and societal risk reports for a home, city, or neighborhood, and its state index pages pair crime with the dominant local hazard — for example "Crime & Flood Risk in Florida," "Crime & Flood Risk in Louisiana," and "Crime & Flood Risk in Texas." The site describes the reports as instant and free, and states the platform includes 12 proprietary risk models. Ratings are shown on a five-level scale: Very Low, Low, Moderate, High, Very High.
To use it:
- Enter your home address, city, or neighborhood in the risk check on the homepage.
- Read the hurricane and coastal flooding rating for that location.
- Compare it against nearby counties — risk is highly local, and a rating one county over may differ sharply.
- Cross-check with your state or county emergency management agency's evacuation zone map, which is the source officials use when ordering evacuations.
The rating tells you how exposed your location is. It does not tell you what to do when a specific storm is approaching — that comes from the National Hurricane Center's forecast cone and your local emergency alerts.
Preparing once a storm is named
- Know your zone and route. Look up whether you are in a coastal evacuation zone and where you would go. Surge zones evacuate first; inland residents usually shelter in place.
- Build a kit now, not at the warning. Water, non-perishable food, medications, batteries, a hand-crank or battery radio, chargers, cash, and copies of key documents.
- Protect the house. Storm shutters or plywood over windows, clear gutters and drains, bring in or tie down anything outdoors that can become a projectile, and trim limbs near the roof.
- Plan for power loss. Assume multi-day outages in Category 2 and above. If anyone in the household depends on powered medical equipment, that is a reason to leave early rather than shelter.
- Track official sources. Follow the National Hurricane Center and your county emergency management office; heed evacuation orders when issued rather than waiting for the storm to strengthen.
The practical sequence is: find your risk rating, learn your evacuation zone, prepare the kit and the house before the season starts, and act on official orders rather than on the category number alone.