Hurricane Preparedness: 48 Hours, 36 Hours, 30 Days

June 1 to November 30.

That is the Atlantic hurricane season as Ready.gov prints it, alongside May 15 for the eastern Pacific. It is also a useless number for planning anything, because six months of vigilance is not a thing a household does. What a household actually runs on is two much shorter clocks, and hurricane preparedness is mostly a question of knowing which one you are on.

The first is the one everybody knows. A hurricane watch goes up 48 hours out, a hurricane warning 36 hours out.

The second is 30 days long, it started in the spring, and it quietly decides how much of this storm you are going to pay for yourself.

June 1 to November 30, and the two numbers inside it

The tropical products are the most precisely timed alerts the National Weather Service issues, which makes them the most useful thing on this page.

The definitions are worth having exactly. A hurricane watch: hurricane conditions, sustained winds of 74 mph or greater, are possible within your area — issued 48 hours before the anticipated onset of tropical storm-force winds. A hurricane warning: those conditions are expected somewhere in the specified area, 36 hours ahead. Tropical storm watches and warnings run on the same 48 and 36, for sustained winds of 39 to 73 mph.

Read the fine print on the watch. The 48 hours are counted not to the eye passing overhead but to the first tropical storm-force winds, which is when ladders, plywood and highway driving stop being reasonable. Your usable window is shorter than the number suggests.

Storm surge carries its own pair, and it is issued separately on purpose: a storm surge watch when there is a possibility of life-threatening inundation from rising water moving inland from the shoreline, generally within 48 hours, a warning when there is a danger of it, generally within 36. A house can be under a storm surge warning and no hurricane warning at all.

Then there is the one you hope never to hear. An extreme wind warning means sustained winds of a major hurricane, 115 mph or greater, usually in the eyewall, are expected to begin within an hour. That alert is not a planning tool. It is an instruction to be in an interior room already.

Getting watch and warning the right way round is worth more than any purchase on this page, and the alert vocabulary is drilled hazard by hazard on the pillar this article belongs to.

Storm surge is the part that kills

Everyone pictures the wind. The roof peeling, the palm bent flat, the reporter in the poncho.

The National Hurricane Center is blunt about where the deaths actually come from. Storm surge — “an abnormal water level rise generated by a storm over and above the predicted astronomical tide” — is currently the leading cause of fatalities from hurricanes. When it coincides with normal high tide, storm tides reach up to 20 feet or more.

Twenty feet is a two-story house.

The NHC’s hazard page splits the country in two on this. Surge and large waves “pose the greatest threat to life and property along the coast”; inland, “flooding is the major threat from tropical cyclones,” from systems that drop more than six inches of rain on ground with nowhere to put it. Same storm, two different ways of drowning, and the second reaches people who never thought of themselves as coastal.

What follows is uncomfortable, because it is not a shopping conclusion. No object keeps surge out of a house. A door barrier is a real purchase against the few inches that come under a door in a downpour, and that reasoning sits in what to do in a flood. Against water with the ocean behind it, the only thing that has ever worked is not being there.

So the one purchase surge argues for is the one that makes leaving fast instead of frantic: a 40-liter roll-top dry bag^aff. living in a closet with the documents, the chargers and three days of clothes already in it. Not a suitcase packed at midnight. A bag you pick up.

Your evacuation zone is not your flood zone

This is the confusion that costs the most, and it comes from two maps that look similar and answer completely different questions.

A FEMA flood zone is an insurance and lending map. It describes the flood risk to a structure, it drives whether a lender requires coverage, and it prices a policy.

An evacuation zone is an operational map. State and county emergency managers draw it around how far storm surge is expected to push inland at each storm strength, and they draw it to be evacuated in blocks, in order, on a schedule that the roads can actually carry. The National Weather Service’s own instruction for finding yours is not a database lookup: find out if you live in a hurricane evacuation area by contacting your local government or emergency management office.

The consequence is the part people miss. You can sit in flood zone X, have never once been required to carry flood insurance, and still be inside evacuation zone B. No lender ever mentioned water to you, and the county still expects you on the road.

The overlay — one block, three official layers

Your evacuation zone and your flood zone are two different maps

Twelve parcels on a schematic stretch of coast. Switch the layer painted on them and watch which houses change color — the ones that change are the households that get the answer wrong.

FEMA flood zone What the insurance map says Evacuation zone What the county says Surge footprint Where the water actually goes Where they disagree Evacuation zone, no mapped flood risk

Storm strength Category 1Category 3Category 5

This block is a schematic, not a real neighborhood. Elevations, zone letters and surge footprints are drawn to make the comparison legible. Your own two answers come from your county's evacuation zone map and from the FEMA Flood Map Service Center, and they are free.

Two lookups, both free, both quick: your county emergency management page for the evacuation zone letter, the FEMA Flood Map Service Center for the flood zone at your address. Do them in one sitting and write both answers on the refrigerator, because the version of you who needs them will be reading a phone in the dark.

Hurricane preparedness before the cone: the work that only fits in spring

Here is the awkward arithmetic of this whole subject. Almost everything that genuinely reduces damage takes longer than 48 hours to arrange.

A flood policy: about 30 days. Panels cut and labeled for each opening: a contractor’s schedule. A roof inspection and the repair it finds: weeks. Trees cut back off the house and the service drop: an arborist who is not already booked solid.

The paperwork belongs to this calendar too, and it is the cheapest item on it. Photograph every room and the exterior once a year, store the pictures somewhere that is not the house, and put policy numbers, deeds, prescriptions and the vehicle titles in one fireproof and waterproof document bag^aff. that travels with you. An adjuster’s first question is what the room looked like before. The full list of what has to be reproducible from outside your house is in important documents in an emergency.

What none of this is: dramatic. It is a spring afternoon, a phone call to an agent, and a saw. It is also the entire difference between the two houses on the same street after the same storm.

The hurricane deductible is a percentage, not a number

Now the clause that produces the worst surprises in American property insurance, and it is one sentence long.

According to the National Association of Insurance Commissioners, as of June 2025 nineteen states and the District of Columbia have some form of hurricane or named storm deductible. Whether it applies to a claim depends on a trigger spelled out in the contract. It can be a fixed dollar amount but is more commonly a percentage of the home’s insured value, from 1 percent to as high as 15 percent. And it is applied separately from standard peril deductibles, typically at a higher dollar amount.

A percentage of the insured value. Not of the claim.

That distinction is why the clause hides so well. Your declarations page says “2%” in a column, which reads like nothing, and 2 percent of a home insured for 400,000 dollars is 8,000 dollars before the insurer pays a cent. At 5 percent it is 20,000. People discover the multiplication in the week they are least able to absorb it.

The worksheet — one storm, three payers

Who actually pays for the damage?

A hurricane deductible is a percentage of what your home is insured for, not a flat amount. Put your own numbers in and watch the line move.

Your home is insured for

$200k $300k $400k $600k $850k

Hurricane or named-storm deductible

None flat deductible only 1 % of insured value 2 % of insured value 5 % of insured value 10 % of insured value 15 % the top of the NAIC range

The damage comes to

$15k $40k $90k $180k $350k

What caused it

Wind Roof, siding, a tree on the garage Wind-driven rain Through the hole the wind made Storm surge Sea water came inland Rainfall flooding Water rose off the ground

Two follow-ups, both boring. Multiply your own percentage out on paper, so the number exists in your head before it exists in a letter. Then ask your agent which trigger your policy uses, because “named storm” and “hurricane” are not the same word.

Hour 48: the watch, and everything that needs a store or daylight

The watch is the whole game. It is the last block of time when the hardware store still has batteries, the pumps still have lines you can wait in, and it is light enough to be on a ladder.

Outside first, because outside needs daylight. Everything loose goes in or gets tied down — furniture, grill, trash cans, planters, the trampoline that becomes a sail. Rope goes slack and rope knots badly in the rain; a set of ratchet tie-down straps^aff. holds what a rope will not. Panels go on the windows. The car moves out from under the tree and off the low end of the street.

Inside, water is the item that runs out first and the one nobody has enough of. A gallon per person per day, and plan on a week rather than three days. If you are on a well, or on a building pump, the tap goes when the power does — which is the argument for a bathtub water storage bladder^aff., filled during the watch, holding roughly a hundred gallons of washing and flushing water that a tub alone loses through the drain overnight. The drinking supply is a separate and permanent thing, sized in emergency water storage.

Then the ordinary list: fuel in both vehicles, cash in small bills, prescriptions refilled, the freezer turned to its coldest setting, everything charged, the 72-hour emergency kit checked rather than assumed. The go bag comes out of the closet and stands by the door, and its contents are in the go bag checklist.

The last item is the one people skip: agree where you are going and tell someone. A destination, a route, a person expecting you, an out-of-area relative everyone texts. Local circuits are the ones that jam.

Hour 36: the warning, and the hour you stop moving

When the warning is posted, the outdoor phase is over. Anything not done is not getting done.

If you are in a zone that has been called, you leave — early, in daylight, before the column forms. The destination is inland of the surge and structurally sound, not far for its own sake. The loading order itself — people, animals, medications, documents, then property — is in a wildfire evacuation. Fuel and hotel rooms disappear along the interstate before they disappear anywhere else.

If you are staying, the house closes. Interior room, lowest floor that is not at flood risk, doors shut, nobody within two meters of a window on the windward side. Which room that is, and how to count the walls between it and the outside, is settled in tornado safety. Phones on low power mode from the start, because the cell network is on borrowed time and the phone is the only thing that carries a message out.

Light is the thing people get wrong. The phone’s flashlight drains in an hour the one object that keeps you reachable for a week. A battery-powered LED lantern^aff. lights a meal rather than a spot, and it cannot be knocked into a curtain the way a candle can, during exactly the days when fire response is slowest.

Information comes off the radio now, not off a feed. NOAA Weather Radio All Hazards broadcasts warnings and forecasts around the clock on its own transmitters, which is what makes it survive the tower that just lost its generator — the receivers are compared side by side in the emergency weather radio guide.

The week after the wind

The storm is the short part. The outage is the long one, and it is where hurricane preparedness either holds or stops.

Ready.gov’s rules on power outages are the ones to have memorized before the generator comes out of the shed: generators and fuel should always be used outdoors and at least 20 feet away from windows, doors and attached garages, with working carbon monoxide detectors on every level of the home. The refrigerator holds about four hours, a full freezer about 48. And if the power is out for more than a day, discard any medication that should be refrigerated, unless the drug’s label says otherwise.

Twenty feet is not a suggestion with room in it. A covered porch is not outdoors. An open garage is not outdoors. Carbon monoxide has no smell and no color, and it puts people to sleep before it hurts them, which is why a battery-operated carbon monoxide alarm^aff. on every floor is the least glamorous line on this page, and the most literally life-saving.

In an apartment there is no generator debate: a balcony is not twenty feet from anything. What runs a modem, lamps, phones and a fan without exhaust is a portable power station^aff., charged before the season and refilled from the car or a panel. A September outage is a heat problem too, handled the way a heat wave without AC is: person first, one room. The days that follow are worked out hour by hour in an extended power outage, and once the interruption stops being a storm and becomes a supply problem, it turns into long-term emergency preparedness.

The morning after looks safer than it is. Lines on the ground are live until someone says otherwise, and roadbeds are scoured out under water that has receded. Six inches of fast-moving water knocks an adult down, which is Ready.gov’s own line and the reason the campaign is called Turn Around, Don’t Drown.

Photograph everything before you move a single thing, room by room, exterior included. That is the evidence a claim runs on, and the deductible you just calculated comes off the top of it.

What does not help, including the thing everybody does

Tape on the windows. It holds shards in loose groups at best, it does nothing against a branch, and its real effect is that people feel protected and stand near the glass. What protects a window is a panel or a shutter. What protects a person is distance from it.

The generator bought in August for an apartment, which will never legally or safely run anywhere its owner can put it.

Buying flood insurance when the cone appears, which is the saddest one on the list because the intention is exactly right and the timing makes it worthless. Thirty days. The policy bought on the Tuesday a storm is named covers the storm after next.

And the sealed bucket sold as a hurricane kit, which holds the same whistle and foil blanket whether it ships to Tampa or to Tulsa. No water worth the name, no way to receive an official warning, no cooler — and after a landfall the cooler is what decides whether the week’s food survives, which makes days of ice retention the only spec worth comparing rather than how many cans it swallows. A hard cooler rated in days of ice retention^aff. earns its corner of the garage. What a household needs it mostly already owns, scattered across four rooms — the useful work is the count and the location, which is what the equipment page is for.

One more, harder to say because it sounds prudent: stocking a month of food in a zone that evacuates. Cases of cans you cannot carry are a reason to hesitate at the door. Depth belongs inland; on the water, the virtue is leaving in ten minutes.

The month this actually gets done in

Not this week, unless something is already in the forecast. The honest answer is a Saturday in April or May, and it is about three hours.

An hour on two lookups and a phone call: the evacuation zone, the flood map, the agent who can read you the deductible line and tell you what your trigger is. An hour in the yard and on the roof, with a list of what needs a professional. An hour on the bag, the documents and the water.

Then nothing, for months, which is what preparedness mostly looks like from the outside.

The question worth sitting with, if you live where the answer arrives every September: at what point in the forecast do you leave — the watch, the warning, or the phone call from a relative who saw the map? Decide it in April, with everyone in the room and nothing happening. The version decided at eleven at night, with the cat missing and the tank half empty, is never the same one.