Hurricane Watch vs Warning: What Each Alert Means and When It Comes
A hurricane watch means sustained winds of 74 mph (119 km/h) or higher are possible in the area, and a hurricane warning means they are expected. The National Hurricane Center (NHC) issues a hurricane watch 48 hours before tropical-storm-force winds are expected to begin, and a hurricane warning 36 hours before. NHC times both to those first winds because preparations become difficult once tropical-storm-force winds arrive.
What is the difference between a hurricane watch and a hurricane warning?
The difference is possible versus expected. Both use the same threshold: sustained winds of 64 knots (74 mph, 119 km/h) or higher. The watch comes first, 48 hours before tropical-storm-force winds of 39 mph or more are expected. The warning follows at 36 hours. The National Weather Service (NWS) says preparations should be complete when a hurricane warning is issued.
The NHC glossary adds one detail. A hurricane warning can stay in effect after winds drop below hurricane force if dangerously high water, or high water combined with waves, continues.
NHC moved tropical storm and hurricane watches and warnings 12 hours earlier starting with the 2010 season, according to its announcement of the change. NHC said growing coastal populations needed more time to prepare. It also pointed to better forecasts: average NHC track errors had been cut in half over the previous 15 years.
What do tropical storm watches and warnings mean?
A tropical storm watch means sustained winds of 39–73 mph (34–63 knots, 63–118 km/h) are possible in the area within 48 hours. A tropical storm warning means those winds are expected within 36 hours. A hurricane watch and a tropical storm warning can cover the same place at once. NHC’s 2026 cone map marks that overlap with diagonal pink and blue lines, as our guide to reading the NHC forecast cone shows.
What is a storm surge watch or warning?
Storm surge alerts are about water, not wind. A storm surge watch means life-threatening inundation from rising water moving inland from the shoreline is possible, generally within 48 hours. A storm surge warning means that inundation is expected, generally within 36 hours. NHC may issue either one earlier when other conditions, such as the early arrival of tropical-storm-force winds, would leave little time for evacuations. Both can also include places that are not expected to flood but could be cut off by flooding nearby.
The NWS and NHC first issued storm surge watches and warnings for the continental U.S. coast in the 2017 hurricane season. They also cover Puerto Rico and the U.S. Virgin Islands, and starting in 2026 the NWS can issue them for the main Hawaiian Islands. NHC calls storm surge the leading cause of fatalities from hurricanes.
What is an Extreme Wind Warning?
An Extreme Wind Warning is the shortest-fuse wind alert for a hurricane. The NWS issues it when sustained winds of 115 mph or greater, usually from the eyewall, are expected to begin within an hour. The NWS advises people in the warning area to take immediate shelter in the interior portion of a well-built structure.
How do the tropical watches and warnings compare?
| Alert | What it means | Timing | Issued by |
|---|---|---|---|
| Tropical storm watch | Sustained winds of 39–73 mph possible | Within 48 hours | NHC or CPHC |
| Tropical storm warning | Sustained winds of 39–73 mph expected | Within 36 hours | NHC or CPHC |
| Hurricane watch | Sustained winds of 74 mph or more possible | 48 hours before tropical-storm-force winds | NHC or CPHC |
| Hurricane warning | Sustained winds of 74 mph or more expected | 36 hours before tropical-storm-force winds | NHC or CPHC |
| Storm surge watch | Life-threatening inundation possible | Generally within 48 hours | NHC with local NWS offices |
| Storm surge warning | Life-threatening inundation expected | Generally within 36 hours | NHC with local NWS offices |
| Extreme Wind Warning | Sustained winds of 115 mph or more | Expected within 1 hour | NWS |
CPHC is the Central Pacific Hurricane Center in Honolulu. Sources: NHC glossary and the NWS page on hurricane watches, warnings and advisories.
Who issues hurricane watches and warnings?
NHC in Miami issues coastal tropical storm and hurricane watches and warnings for the Atlantic and eastern Pacific. It marks where each alert starts and ends with agreed coastal points called breakpoints. The Central Pacific Hurricane Center covers the area from 140°W to the International Date Line, which includes Hawaii. NHC advisories tell people in the United States to monitor their local NWS forecast office for possible inland watches and warnings. Local offices also issue Hurricane Local Statements with details on wind, surge, flooding rain and tornadoes for their areas.
Watches and warnings can come before a storm even forms. NHC can issue advisories, watches and warnings for a potential tropical cyclone, a disturbance that is not yet a tropical cyclone but threatens tropical storm or hurricane conditions on land. Since 2025, NHC may start these advisories up to 72 hours before storm surge or tropical-storm-force winds are expected on land, even before watches are needed. The NWS can also keep wind watches and warnings in place for post-tropical cyclones that still threaten land.
What does the NWS advise when these alerts are issued?
The NWS guidance for each alert is short:
- Hurricane warning: preparations should be complete; evacuate immediately if so ordered.
- Watches: follow instructions from local officials and evacuate if told to do so.
- Storm surge warning: check for evacuation orders from local officials.
- Extreme Wind Warning: take immediate shelter in the interior of a well-built structure.
NHC adds that everyone, including people outside highlighted storm surge areas, should follow evacuation orders from local officials.
Official watches and warnings appear on hurricanes.gov and in NWS alerts for each county and coastal zone. Our live list of NWS alerts by state shows them in one place, including active NWS alerts for Florida. How alerts reach phones is covered in our guide on how official emergency alerts reach you.
Bottom line
A watch means possible and a warning means expected, and both are timed to the first tropical-storm-force winds, 48 and 36 hours out. Storm surge watches and warnings are separate alerts for flooding from the sea. When any of them covers your area, follow your local officials and your NWS office.
FAQ
Can a hurricane warning stay up after the wind dies down?
Yes. NHC says a hurricane warning can remain in effect when dangerously high water, or high water combined with waves, continues even though winds are below hurricane force.
Is a hurricane advisory the same as a warning?
No. NHC’s Tropical Cyclone Public Advisory is a bulletin, not an alert level. It lists the storm’s position, winds, motion, hazards and the watches and warnings in effect. Our guide to watch vs warning vs advisory covers how the NWS uses the word advisory for other hazards.
Do inland areas get hurricane warnings?
Yes. NHC advisories direct people to local NWS offices for inland watches and warnings. Since 2026, NHC’s cone map also shows inland tropical storm and hurricane watches and warnings for the United States.
How far ahead does a storm surge warning come?
A storm surge warning means life-threatening inundation is expected, generally within 36 hours, and a watch means it is possible, generally within 48 hours. NHC can issue them earlier when tropical-storm-force winds would arrive first and cut preparation time.