Watch vs warning: what's the difference?
Updated
A Watch means conditions are favorable for a hazard in your area within the next several hours to two days, so you should be prepared. A Warning means the event qualifies as occurring, imminent, or very likely, and you should take action now, usually within 30 to 60 minutes for severe storms. An Advisory is a step below a warning, for a hazard that will cause inconvenience but is not expected to be dangerous.
Right now283Warnings in effect nationwideas of Snow totals by state, measured
WeatherTotals issues no alerts or warnings. Official warnings: weather.gov.
Watch, warning, advisory side by side
| Term | What it means | How far ahead | Area | What to do |
|---|---|---|---|---|
| Watch | The hazard could develop in and near the watch area, with conditions favorable. | Typically hours to 2 days ahead. | Broad area, such as counties or parts of states. | Be prepared and stay informed. |
| Warning | The event has already begun, could start at any moment, or is very likely. | 30 to 60 minutes for severe storms; hours to a day for winter storms. | Smaller area: a polygon for tornadoes, severe storms, flash floods, and snow squalls; counties for winter storms. | Take action now and follow local instructions. |
| Advisory | A hazard that is expected to cause inconvenience but is below warning level. | Varies by hazard type. | Varies by hazard type. | Be aware and adjust plans. |
Common pairs
| Event | Watch issued by | Warning issued by | Phone alert? |
|---|---|---|---|
| Tornado | Storm Prediction Center | Local NWS office | Yes |
| Severe thunderstorm | Storm Prediction Center | Local NWS office | Yes, for destructive severe thunderstorm |
| Winter storm | Local NWS office | Local NWS office | No |
| Flash flood | Local NWS office | Local NWS office | Yes, for considerable or catastrophic flash flood |
| Extreme cold | Local NWS office | Local NWS office | No |
Why do people mix them up?
The two words sound similar, and 'watch' can seem more urgent than it is. The National Weather Service uses a kitchen analogy: a watch means the ingredients are on the counter, and a warning means they are in the oven. That image captures the difference in urgency.