Watch vs. warning vs. advisory: what NWS alert levels mean

The National Weather Service (NWS) sorts most of its alerts into three levels: watch, warning and advisory. The names are short on purpose. Each one tells you how likely the hazard is and how much you should change your plans. Mixing them up is easy, and it matters most on the days when there's least time to look things up.

Here is what each level means, what NWS suggests doing, and a few details that trip people up.

The short version

These are paraphrased from NWS offices' explanations, such as NWS San Angelo's page. The national pages for each hazard, like tornadoes, floods, heat and cold, use the same three ideas.

Warning: act now

A warning is the level that asks you to do something. The hazard is under way or expected soon, and it's serious enough to threaten life or property.

What "act" means depends on the hazard. For a Tornado Warning, NWS advises going to an interior room on the lowest floor of a sturdy building, away from windows. If you're in a mobile home, a vehicle or outdoors, the advice is to get to sturdier shelter. For a Flood Warning, it's moving away from flood-prone areas to higher ground. A Flash Flood Warning is more urgent still, because water can rise within minutes.

Warnings usually cover a smaller area than watches. A Tornado Warning is drawn around the storm's path and can cover part of a county. The local NWS office issues it when a tornado has been reported or radar indicates one.

Watch: get ready

A watch means conditions favour the hazard, but it hasn't formed yet, or its location and timing aren't settled. It's the time to prepare.

A Tornado Watch, for example, is issued by the Storm Prediction Center for a broad area, often many counties and sometimes parts of several states, for a span of hours. Most places inside a watch never see a tornado. A watch is still the moment to work out where you'd shelter, charge your phone, and make sure you'll hear a warning if one comes, including at night.

Advisory: take care

Advisories are for weather that's a real nuisance or a hazard if you're careless, but below warning level. Typical ones are a Winter Weather Advisory for slick roads, a Heat Advisory, a Dense Fog Advisory or a Wind Advisory. An advisory usually doesn't mean "leave" or "take shelter". It means slow down, leave extra time, check on people who are more at risk, and keep watching for an upgrade.

Statements and "emergencies"

Two other kinds of alert sit alongside the three main levels.

A Special Weather Statement covers hazards that need extra attention but don't meet advisory or warning criteria. Examples are a strong but sub-severe thunderstorm, black ice or a band of heavy snow. Other statements update an existing warning, for example to say a storm has weakened or the warning has been cancelled.

At the other end, NWS sometimes uses "emergency" wording. A Tornado Emergency or a Flash Flood Emergency is the highest level of a warning, used rarely, when a violent tornado is confirmed or catastrophic flooding is under way. In NWS data these aren't separate alert types: they are tags inside a Tornado Warning or Flash Flood Warning (NWS impact-based warning examples). If you see that wording, treat it as the most urgent kind of warning.

Common alerts by hazard

Some names changed recently, so older articles may use the old ones. In March 2025, NWS renamed the Excessive Heat Watch and Warning to Extreme Heat Watch and Warning. In October 2024, it replaced the Wind Chill products with Extreme Cold Watch, Extreme Cold Warning and Cold Weather Advisory. NWS has also said that, in a future change with at least six months' notice, it plans to replace most "Advisory" and "Special Weather Statement" headlines with plain-language headlines (Hazard Simplification FAQ). As of October 2026, the live alert feed still uses both names.

Who issues them

Most alerts come from the 122 NWS Weather Forecast Offices, each responsible for its own set of counties. That's why an alert names an office, such as "NWS Fort Worth TX". National centres handle some products. The Storm Prediction Center issues tornado and severe thunderstorm watches, and the National Hurricane Center issues coastal tropical storm, hurricane and storm surge watches and warnings.

Evacuation orders, road closures and shelter openings come from local and state officials, not from NWS. When officials give an instruction for your area, follow it.

Where to get them

Official channels come first, and it's worth having more than one.

• Wireless Emergency Alerts (WEA) arrive on most phones with no app or sign-up. NWS sends WEA for the most dangerous warnings: tornado, hurricane, storm surge, extreme wind, tsunami, dust storm and snow squall warnings. Flash flood warnings go out only when tagged considerable or catastrophic, and severe thunderstorm warnings only when tagged destructive. Watches and advisories aren't sent this way. FEMA's WEA page explains how local agencies use the same system.
• NOAA Weather Radio broadcasts around the clock from over 1,000 transmitters and can wake you with a tone. It needs a dedicated receiver.
• weather.gov shows every active alert for a location, and local TV and radio carry them too.

Because WEA leaves out watches and advisories, it helps to check a forecast source on days when your local office is talking about a risk.

How Herebeat labels NWS alerts

Herebeat shows NWS alerts with the level NWS gave them: "Official warning", "Official watch", "Advisory" or "Statement", next to the alert's own name and the issuing office. It never raises an alert's level. If the data is ambiguous, it shows the lower one, and an alert with no level word stays a plain "Official alert". Each item links to the original NWS text.

Habits that help

Read the whole alert, not just the headline. The details say where, when and what to expect, such as a river crest time or expected snowfall rates. Note the expiry time, and remember an alert can be extended, upgraded or cancelled. Know which county you're in, and which ones you drive through. And keep your phone's emergency alerts switched on.