Two words decide what you should be doing as a storm approaches: watch and warning. They sound alike and get mixed up constantly — but they mean very different things, and confusing them costs preparation time you can't get back.
Watch = be ready. Warning = act now.
- A Watch means the hazard is possible in your area. Get ready.
- A Warning means the hazard is expected in your area. Take action now to protect life and property.
The timing built into each
The lead times are deliberate — tied to when it stops being safe to work outside:
- Hurricane Watch — hurricane conditions (sustained winds 74 mph or greater) are possible, issued about 48 hours before tropical-storm-force winds arrive. It comes early because it isn't safe to prepare once the wind is already up.
- Hurricane Warning — hurricane conditions are expected, issued about 36 hours ahead so you can finish preparing or evacuate.
- Tropical Storm Watch / Warning — same 48-hour / 36-hour timing, for sustained winds of 39-73 mph.
What it looks like on a timeline
Say a hurricane is three days out. Around two days before the winds would reach you, NHC raises a Hurricane Watch — your cue to review the plan, fuel up, and gather supplies while stores are open and roads are clear. Around a day and a half before, if the threat firms up, that becomes a Hurricane Warning — finish up, and if you're told to evacuate, leave. Notice the warning lands 36 hours before tropical-storm-force winds, not before the eye: once those winds arrive, your window to act — or to drive out — is already closing.
Don't overlook the separate Storm Surge Watch and Warning
Because the water is the deadliest part of a hurricane, NHC issues a Storm Surge Watch (life-threatening inundation possible, generally ~48 hours) and a Storm Surge Warning (life-threatening inundation a danger, generally ~36 hours) on their own — independent of the wind warning. You can be under a Storm Surge Warning even where the wind warning is lower, so check both.
What to do at each stage
- Watch issued: review your plan, fuel up, charge devices, gather supplies, refill prescriptions, and confirm your evacuation zone.
- Warning issued: finish preparations early, secure or bring in loose outdoor items, and if officials tell you to evacuate, go immediately — don't wait for conditions to worsen.
Bottom line
Watch means get ready; warning means do it now. Track both the wind and the storm-surge versions, and let the warning — not the sky outside your window — tell you when your time is up.