The Generator Checklist for the 48 Hours After a Hurricane Watch
September 1, 2026
A hurricane watch is issued about 48 hours before tropical-storm-force winds are expected; a warning about 36 hours. That is the working window for a generator, and half of the list cannot be done in it.
What the watch and warning actually mean
The National Hurricane Center posts a hurricane watch when hurricane conditions are possible in the area, generally 48 hours before the onset of tropical-storm-force winds. A warning follows at roughly 36 hours. Preparation stops when tropical-storm winds arrive, not when the eye does, because nobody should be outside handling fuel or equipment in 40-mile-an-hour gusts.
So the real window is about a day and a half of daylight. The list below is ordered for that.
Hour zero to twelve: the things that need daylight
Start with a manual exercise run under load, not just the weekly self-test. The self-test proves the engine starts; a fifteen-minute run with the transfer switch moved to generator proves the house actually picks up. Watch the voltage and frequency on the controller and listen for anything new.
Then fuel. Propane tanks should be topped now, because delivery trucks stop running once the warning is posted. Natural gas needs nothing. Portables need fresh, stabilized gasoline in every can, and the cans need to be stored where they will not float.
- Run under load for 15 minutes; note voltage, frequency, and oil pressure if displayed.
- Top propane to the fill limit; confirm the tank is anchored.
- Check the battery date and terminals; a battery over three years old is the most common no-start.
- Clear the intake and exhaust sides of the enclosure; strap or remove anything that could blow into it.
Hour twelve to thirty-six: the household side
Set the thermostat plan now: a few degrees warmer during the outage keeps the compressor cycling less and the fuel lasting longer. Decide which loads will be shed if the system does not have automatic load management, and label the breakers so anyone in the house can do it.
Charge everything, freeze water in the gaps of the freezer, and put a battery carbon monoxide alarm on every sleeping level. The alarm matters most for portable users, but a standby installed too close to a window is the same hazard with a nicer enclosure.
What is already too late
A no-start found in the watch window is a generator repair call in a week when every technician on the Coast has the same call. Parts that ship from a warehouse will not arrive. A weak battery can sometimes be swapped from stock; a failed controller or a fuel regulator cannot.
This is the argument for the pre-season service in May. A maintenance visit before June changes oil and filters, load-tests the battery, checks the transfer switch, and finds the problem while there is still time to fix it.
During and after the storm
Standbys start themselves; the only job is to stay away from the enclosure while winds are up. Portables get started after the wind drops, outside, at least twenty feet from any door, window, or vent, never in a garage or carport. Refuel a portable only when it is off and cool.
After the storm, check the enclosure for water intrusion and debris before trusting it for a week. A standby that took surge water needs a professional look before it runs. For a Coast generator plan that survives the season, the checklist above is the routine; the survey and the spring service are what make the checklist short.
More from the blog
Quick Answers
Should the generator be turned off before the storm hits?
A standby should be left in auto. It will start when the utility drops and run through the storm; the enclosure is designed for wind and rain. Only a unit in the surge zone that cannot be elevated should be shut down and disconnected, and that is a decision to make with the installer.
How often should a standby run during a long outage?
Continuously, with a scheduled shutdown every 24 hours or so to check oil level and let the engine cool for a few minutes. Most controllers display run hours and will flag oil pressure or temperature problems before they become failures.
Can propane be delivered during a hurricane warning?
Usually not. Most Coast suppliers suspend deliveries once a warning is posted and roads become unsafe. The fill has to happen at the watch stage or, better, in the spring.