Hurricane Categories: Saffir-Simpson Scale Guide

What the Category Number Actually Means

When a hurricane warning hits the news, the category number gets top billing. But that number tells you only one thing: how fast the wind is spinning at the storm’s surface. It says nothing about rainfall totals, tornadoes embedded in the outer bands, or — most critically — storm surge.

Understanding what each category actually means for your home, your family, and your decision to stay or leave is the foundation of hurricane preparedness.

The Saffir-Simpson Scale: All 5 Categories

The Saffir-Simpson Hurricane Wind Scale was developed in the early 1970s by civil engineer Herbert Saffir and National Hurricane Center director Robert Simpson. It classifies hurricanes into five categories based on maximum sustained wind speed (one-minute average at 10 meters above surface).

Category	Wind Speed	Storm Surge	Damage Level	What to Expect
Cat 1	74 to 95 mph	4 to 5 ft	Minimal	Roof/siding damage, downed trees, power outages days to a week
Cat 2	96 to 110 mph	6 to 8 ft	Moderate	Major roof damage, many trees snapped, power out days to weeks
Cat 3	111 to 129 mph	9 to 12 ft	Extensive	Devastating damage to framed homes, power out weeks to months
Cat 4	130 to 156 mph	13 to 18 ft	Extreme	Catastrophic structural damage, most trees down, long-term uninhabitable areas
Cat 5	157 mph or higher	18 ft or higher	Catastrophic	Total roof failure and wall collapse on many homes, massive storm surge, months of recovery

Category 1 (74 to 95 mph)

A Category 1 is a real storm — don’t dismiss it. Expect roof shingle and gutter damage, downed branches, and snapped small trees. Older mobile homes and poorly maintained structures can suffer significant damage. Power outages of three to seven days are common. Storm surge of 4 to 5 feet is dangerous for beachfront properties and low-lying coastal areas.

Hurricane Irene (2011) made landfall in North Carolina as a Category 1 and caused over 7 billion dollars in damage — mainly from inland flooding, not wind. Category doesn’t equal total impact.

Category 2 (96 to 110 mph)

Winds become destructive to structures not built to current codes. Shallow-rooted trees snap or uproot in large numbers, blocking roads for days. Power outages extend from several days to a few weeks. Storm surge of 6 to 8 feet can flood coastal roads and low-lying inland areas. Mobile and manufactured homes should be evacuated.

Category 3 (111 to 129 mph) — Major Hurricane Threshold

Category 3 is the first “major hurricane” classification. At this threshold, well-built framed homes can suffer major damage. Electricity and water are unavailable for days to weeks after the storm. Storm surge of 9 to 12 feet can overtop seawalls and penetrate miles inland in flat coastal terrain.

Hurricane Katrina made its final Louisiana landfall as a Category 3. The Category 5 damage came from the storm surge — up to 27 feet in some Mississippi coastal areas — not the wind speed at landfall.

Category 4 (130 to 156 mph)

At Category 4, catastrophic damage is expected. Well-built homes can lose most of their roof structure. Nearly all trees are snapped or uprooted, isolating residential areas. Power outages last weeks to months. Storm surge of 13 to 18 feet inundates everything in its path.

Hurricane Harvey (2017) hit Texas as a Category 4. The resulting floods killed 36 people directly and caused 125 billion dollars in damage — second only to Katrina at the time.

Category 5 (157 mph or higher)

Category 5 is the top of the scale, but not the top of nature’s capability. Sustained winds above 157 mph cause complete roof failure and wall collapse on many residential structures. A high percentage of framed homes are destroyed. Virtually all trees are felled. Storm surge exceeds 18 feet over large areas. Affected areas may be uninhabitable for weeks to months.

Only four Category 5 landfalls have struck the continental United States: the 1935 Labor Day Hurricane, Camille (1969), Andrew (1992), and Michael (2018). The Florida Keys were essentially wiped off the map by Camille’s predecessor — the Labor Day storm — with winds estimated at 185 mph.

Storm Surge: The Number the Category Doesn’t Tell You

The National Hurricane Center estimates that storm surge accounts for approximately half of all hurricane-related deaths. Wind kills buildings. Storm surge kills people.

Storm surge is ocean water driven ashore by the storm’s rotation and forward movement. In a Category 4 or 5 hurricane, the surge can arrive as a wall of water 13 to 18 feet or higher — moving faster than you can run, carrying debris, and persisting for hours as the storm passes.

What drives surge beyond category:

Track and angle of approach: Storms making a perpendicular landfall concentrate surge more than those running parallel to shore
Coastline shape: Funnel-shaped bays (like Tampa Bay) amplify surge dramatically
Seafloor slope: Gradually sloping seafloors allow surge to travel farther inland
Storm speed: Slower storms pile up more water

The NHC publishes SLOSH (Sea, Lake, and Overland Surges from Hurricanes) model maps for every major coastal county. Your county’s evacuation zones are drawn from these maps — not from wind speed alone.

Evacuation Zones vs. Shelter in Place

Know Your Zone Before the Storm

Every coastal county in the United States maintains evacuation zone maps (typically lettered A through E or numbered 1 through 5, depending on the state). Zone A (or Zone 1) contains the highest storm surge risk — coastal areas, barrier islands, and low-lying land adjacent to water. Zone E (or Zone 5) covers inland areas with much lower risk.

Find your zone now, not when a storm is 48 hours out:

Florida: floridadisaster.org/know-your-zone
Texas: hcoem.org (Harris County) or check your county emergency management site
All states: ready.gov/hurricanes → link to your state’s resources

When to Evacuate

Evacuate if any of these apply:

You are in Zone A or Zone B (or equivalent highest-risk zones)
You live in a mobile home, manufactured home, or RV
Your home is on the waterfront or in a flood plain
Local officials issue a mandatory evacuation order for your zone
You have household members who need extra time (elderly, disabled, infants, pets)

The timing rule: Leave when evacuation is voluntary, not when it becomes mandatory. Voluntary orders typically come 72 to 96 hours before landfall. Mandatory orders come 48 hours out — by which point highways are gridlocked and fuel stations are running dry.

When Sheltering in Place Is Appropriate

Sheltering in place is appropriate only if:

You are inland, well outside the storm surge inundation zone
Your home is a solidly built structure (concrete block, reinforced frame, or elevated above flood level)
The storm is forecast as Category 1 or 2 with no surge risk at your location
You cannot leave due to medical needs or other constraints

If you shelter in place for a Category 3 or stronger storm, identify the interior room on the lowest floor (not the ground floor if flooding is possible) with no windows as your safe room. Bring your go-bag, water, and food there before the eyewall arrives.

Hurricane Prep by Lead Time

7-Day Prep List

When a storm enters the 7-day forecast cone for your area:

72-Hour Prep List

When the storm enters the 72-hour warning window:

24-Hour Prep List

Final actions before the storm arrives:

Final headcount — everyone accounted for, including pets
Fill vehicle gas tank one final time if staying
Move vehicles to garage or away from large trees
Identify your safe room and move supplies there
Unplug major appliances to protect from surge damage
Turn refrigerator and freezer to their coldest settings
Download offline maps (cell service will be disrupted)
Know the “all clear” process: do NOT go outside until local emergency management confirms the storm has passed

Power Outage Prep for Hurricanes

Hurricanes are not 24-hour power outages. They are multi-day to multi-week events with systematic destruction of the distribution grid.

Minimum prep for any Category 3 or stronger storm: 14 days without grid power.

After Hurricane Maria in Puerto Rico (2017, Category 4), median time to power restoration was 84 days. The last areas were restored after 11 months.

Tiered Power Strategy

Tier 1 — Phone and communication (72 hours minimum):

High-capacity battery bank: 20,000 to 40,000 mAh
Solar charging panel (foldable, 25 to 60 watts)
Hand-crank NOAA weather radio with USB charging

Tier 2 — Essential appliances (7 to 14 days):

Portable power station (1,000 to 2,000 Wh): runs fans, small medical devices, lighting
Propane camp stove for cooking (store 5 to 10 lbs minimum)
LED lanterns with rechargeable batteries

Tier 3 — Whole-home backup (extended outages):

Standby generator (whole-home, 10 to 20 kW) wired to a transfer switch
Or a dual-fuel portable generator (7,500+ watts) with a safe outdoor operating setup
7 to 10 days of fuel stored (rotate every 6 months using fuel stabilizer)

Generator Safety: CO Poisoning Kills More Than the Storm

Carbon monoxide poisoning from improperly used generators kills dozens of Americans after every major hurricane. This is preventable.

Generator rules — no exceptions:

Operate only outdoors, at least 20 feet from any window, door, or vent
Never run in a garage, even with the door open
Install battery-operated CO detectors on every floor
Never refuel a running generator

FEMA data from 2004 to 2019 shows that generator-related CO deaths spike in the days immediately after hurricanes — when people are exhausted and taking shortcuts. Set these rules before the storm so they’re automatic when you’re sleep-deprived and stressed.

Post-Hurricane Safety

Do Not Go Outside During the Eye

The eye of a hurricane can feel like the storm is over. Winds drop, rain stops, blue sky may even appear. This calm typically lasts 20 to 45 minutes before the opposite eyewall — which can be even stronger than the leading eyewall — arrives.

Going outside during the eye is a documented cause of hurricane deaths every season. Stay inside until your battery-powered weather radio or official local emergency management confirms the storm has completely passed your location.

Floodwater Is Hazardous

Post-hurricane floodwater is not rainwater. It contains sewage, chemicals from flooded industrial sites, downed power lines, submerged debris, and biological contaminants.

Floodwater rules:

Six inches of moving water can knock an adult off their feet
One foot of moving water can sweep away most passenger vehicles
Never drive through a flooded road — the surface may be completely gone
Do not let children play in or near floodwater
Wear rubber boots, gloves, and eye protection when wading through any flooded area
Wash hands thoroughly with clean water and soap after any flood contact

Structural Assessment Before Re-Entry

After the storm, before re-entering any structure:

Check for visible structural damage (bowed walls, sagging roof, cracked foundation)
Smell for gas before entering — if you smell gas, do not enter, call your utility company
Check the electrical panel before restoring power — do not flip breakers with wet hands or if you see water damage to the panel
Photograph all damage before cleanup for insurance documentation
Contact your insurance company within 24 to 48 hours of the storm

Hurricane Season: When to Have Your Preps Ready

The Atlantic hurricane season runs June 1 through November 30, with peak activity between mid-August and mid-October. The statistical peak is September 10.

The rule: All hurricane preps should be complete by May 31. Do not wait for a named storm to start building supplies. By the time a storm is forecast for your area with 72 hours of lead time, water and fuel shelves at local stores are already cleared.

Build your preparedness infrastructure in the off-season (December through April) when prices are normal and competition is zero. See our emergency preparedness checklist for a full build-out list, and our natural disaster preparedness guide for coverage of other regional threats alongside hurricanes.

The Bottom Line

A storm’s category tells you about its wind. Your survival depends on knowing far more than that: your evacuation zone, the surge forecast for your specific location, the structural integrity of your home, and whether you have the supplies to sustain yourself and your family without outside support for two weeks.

The Saffir-Simpson scale is a starting point — not the full picture. Use it as the trigger that tells you how seriously to take a storm, then drill down to your local NHC storm surge maps, your county’s evacuation zone, and your own preparedness level to make the actual decision.

Category 1 storms with direct landfall on your home can be more dangerous than Category 4 storms tracking 50 miles offshore. Your address — not the category number — is the variable that matters most.

Frequently Asked Questions

What is the Saffir-Simpson scale?

The Saffir-Simpson Hurricane Wind Scale rates hurricanes from Category 1 to Category 5 based on maximum sustained wind speed. It was developed in the early 1970s by civil engineer Herbert Saffir and meteorologist Robert Simpson. The scale predicts potential property damage but does NOT account for storm surge, rainfall flooding, or tornado spin-offs — which are often the deadliest components.

What is the most dangerous part of a hurricane?

Storm surge — the wall of ocean water pushed ashore by the storm — kills more people than any other hurricane hazard. A Category 4 hurricane can produce a storm surge of 13 to 18 feet, which inundates entire coastal neighborhoods in minutes. Wind speed determines the category, but storm surge determines the death toll.

When should I evacuate for a hurricane?

Evacuate immediately if you are in a Zone A or Zone B evacuation area, live in a mobile or manufactured home, or are within the potential storm surge inundation zone. Do not wait for a mandatory order — voluntary evacuation warnings are issued 48 to 72 hours before landfall to give you time to leave before roads become gridlocked. Sheltering in place is only appropriate if you are inland, in a well-built structure, and outside the storm surge zone.

How long do power outages last after a hurricane?

Category 1 and 2 hurricanes typically cause outages lasting hours to a few days. Category 3 storms can knock out power for one to two weeks. Category 4 and 5 strikes can cause outages lasting weeks to months in the hardest-hit areas. Hurricane Maria left parts of Puerto Rico without power for over 11 months. Plan your power prep around a two-week minimum for any Cat 3 or stronger storm.

Is it safe to go outside during the eye of a hurricane?

No. The eye brings a temporary lull in wind and rain that can feel like the storm is over, but the other eyewall — often the strongest part of the storm — arrives within 20 to 45 minutes. Going outside during the eye is a leading cause of hurricane deaths. Stay inside until official all-clear from local emergency management.