Hurricane watch vs warning: what each one means
A watch says conditions are possible; a warning says they are expected. The difference is about 12 hours and it defines what you should be doing now.
The two terms sound alike and the gap between them is hours of margin. Confusing them is what leads people to start buying water when there is none left, or to still be tying things down in the yard when the wind is already on them.
Watch: prepare
A hurricane watch covers a broad area for several hours and means the atmosphere has what it takes to produce hurricane conditions. It does not mean one is present.
Under a watch you should be buying what is missing, filling tanks, clearing the yard and deciding whether you stay or go.
Warning: shelter now
A hurricane warning means conditions are expected. It covers a smaller area and a shorter interval, and the margin is tighter because by then it is known to be coming.
Under a warning, outdoor preparation should already be finished. What is left is securing the interior, moving to the safest room, and leaving if an evacuation order applies.
| Watch | Warning | |
|---|---|---|
| What it says | Conditions possible | Conditions expected |
| Typical lead time | 48 hours | 36 hours |
| What to do | Prepare, buy, decide | Finish, secure, shelter |
| Outdoors | Bring in and tie down | Should already be done |
The cone is not the danger zone
The forecast cone graphic is probably the most misread element of a hurricane forecast. It shows where the centre of the storm may be, with an error margin that widens with time.
It says nothing about how far the effects reach. A large hurricane produces destructive wind, torrential rain and surge hundreds of miles from the centre, well outside the drawn cone.
The category measures wind and only wind
The Saffir-Simpson scale rates hurricanes 1 to 5 by sustained wind speed. It is useful for estimating structural wind damage and measures nothing else.
A slow, very wet Category 1 can kill more people than a fast Category 4, because it dumps more rain on the same area. That is why it pays to read the specific warnings — wind, surge, flash flooding — rather than fixating on the number.
The storm surge warning stands on its own
Storm surge is the rise in ocean water a hurricane pushes ashore, and it has historically caused the greatest share of deaths. It is warned separately because its reach does not match the wind field: there can be a surge warning along stretches where the wind never reaches hurricane force.
- What to do in the 96 hours before a hurricane The useful window closes far earlier than people think. What to do at 96, 72, 48, 24 and 6 hours before landfall, hour by hour.
- When to evacuate for a hurricane and what to take An evacuation order is not a suggestion. How to find out whether your address is in an evacuation zone, when to leave and what fits in the car.
Gear that covers this
Products that match what the guide above recommends.
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- View on Amazon
NOAA weather radio
Warnings go out over weather radio even with no cell service and no power. It is the one channel that does not depend on the infrastructure the storm will knock down.
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High-capacity power bank
Following the forecast drains a phone exactly when there is nowhere to recharge. A spare battery keeps it running through the critical phase.
Frequently asked questions
What is the difference between a hurricane watch and a warning?
A watch means hurricane conditions are possible in the area, typically within 48 hours. A warning means they are expected, typically within 36 hours. A watch is for preparing; a warning is for finishing and taking shelter.
Does the forecast cone show where the hurricane will hit?
No. The cone shows the probable track of the storm centre, not the extent of its effects. Wind, rain and storm surge reach areas well outside the cone.
Does the category measure the total danger?
No. The Saffir-Simpson scale measures sustained wind speed only. It does not reflect storm surge or rainfall, which cause most hurricane deaths.
What is a storm surge warning?
A separate warning from the hurricane warning that flags life-threatening inundation from rising ocean water. It can be issued in places where wind will not reach hurricane force.