A flood watch means conditions could produce flooding. A flood warning means flooding is happening or expected soon in the identified area. A flash flood warning requires prompt action because water can rise quickly. The next step depends on where you are, the warning’s affected area and the instructions from local officials.
If you are in immediate danger, call 911 from a safe location. Do not wait to finish an article, check a dashboard or photograph damage before taking protective action.
Use our live weather alert finder to check NWS messages, then read the full official instructions. For local agency resources, open the state-by-state emergency guide.
Flood watch vs. flood warning: the practical difference
What the alert means and what to do next
| Alert |
Meaning |
Next step |
| Flood watch |
Conditions favor flooding, but flooding is not certain. |
Check your plan, supplies and warning channels. Be ready to act if conditions change. |
| Flood warning |
Flooding is occurring or imminent in the affected area. |
Read the location and instructions immediately. Follow protective-action and evacuation directions. |
| Flash flood warning |
Rapid flooding is occurring or imminent. |
If you are in a flood-prone location, move to higher ground immediately using a safe route. |
| Flood advisory |
Flooding may cause disruption even when warning criteria are not met. |
Stay alert to changing conditions and avoid flooded roads and low spots. |
These meanings follow the National Weather Service’s flood alert definitions. An advisory is not permission to drive through water. A watch is not a guarantee that there will be time to finish preparations later.
What to do during a flood watch
Use the preparation window to make the next decision easier. The NWS recommends planning communications, knowing flood-prone routes, charging essential electronics and gathering supplies before flooding.
- Confirm how your household will reconnect. Choose a contact person and a meeting plan if people are separated.
- Identify higher ground and a destination. Think about routes from home, work and school. Check current road information before leaving.
- Prepare what you would carry. Keep necessary medicine, drinking water, a flashlight, phone power and essential documents accessible.
- Plan transportation early. If someone needs help leaving, arrange that help before roads deteriorate. Include pets in the plan.
- Do only safe property preparations. Moving belongings or setting up protection must not delay leaving a threatened location.
The CDC’s flood preparation guidance also recommends learning community evacuation routes and shelter arrangements, protecting essential documents and arranging transportation when a vehicle is unavailable. Ask local emergency management about accessible transportation and pet accommodations before assuming a particular shelter can meet those needs.
For organizing household checks well before a storm, use our water damage prevention checklist. A maintenance checklist is not a reason to stay during an evacuation.
What to do during a flood warning or flash flood warning
Prioritize people and a safe route. Follow evacuation orders promptly. If you are in a flood-prone area with a flash flood warning, move to higher ground. Do not enter floodwater on foot or in a vehicle, and do not drive around a closure or barricade. The NWS’s instructions for flooding emphasize avoiding floodwater and rooms where water may contact electrical equipment.
If water is already entering a basement or surrounding electrical equipment, do not go into it to reach a breaker, unplug an appliance or retrieve possessions. From safety, contact the appropriate emergency service or utility. If rising water traps you, move to the highest accessible safe point and call 911 when possible.
Do not use a different hazard’s shelter rule automatically. A basement may be a recommended tornado shelter in some circumstances, but it can be dangerous during flooding. When hazards overlap, read the current official instructions for your location.
How to tell whether an alert applies to you
Start with the affected area, not just the city in a headline. NWS alerts may use counties, forecast zones or a smaller mapped warning area. A statewide list includes alerts for different places. A city’s representative point may not describe conditions at your home, workplace or travel destination. The NWS geolocation guide explains these geographic differences.
Our alert finder shows the official area description, issuing office, instructions and message times. Its city selection is a starting point. Follow the Weather.gov link to check your exact location, and read your local emergency agency’s evacuation and road-closure information.
Read the times separately
- Issued: when the agency sent that version of the message.
- Event begins and ends: the stated window for the hazard, when supplied.
- Message expires: when that message stops being valid. Look for updates, extensions or replacement messages.
- Retrieved: when a website successfully fetched the data. This is not a new forecast or a new observation of flooding.
The finder displays times in UTC. Check the time zone before comparing them with a local schedule. For example, a watch retrieved today can describe a hazard expected tomorrow. A new retrieval does not change the agency’s event window. These distinctions help explain why an active message and a hazard happening at this moment are not always the same thing.
Does no alert mean it is safe?
No. A failed connection is different from a successful search that returns no active messages. Neither establishes that roads are passable or that a home is safe to enter. The NWS feed also does not contain every local or non-weather emergency notice, as its alert service documentation explains.
Keep local warning channels available. Check your state and local emergency resources for evacuation orders, road restrictions and shelter information. Treat screenshots and forwarded alerts as a prompt to check the current official message, not as a continuously updated source.
After a warning ends, when can cleanup begin?
A message expiring does not clear a building for reentry. Floodwater may leave contamination, damaged electrical systems and unstable materials. The NWS recommends waiting for authorities’ clearance before entering a flood-damaged building and following road-closure and utility instructions.
Once access is permitted and the relevant hazards have been assessed, use our flood damage cleanup guide to organize the recovery questions. Record observations made from a safe place in the incident and documentation log. Keep the original photos, messages and documents, and distinguish what you observed from what someone else reported.
Written by Water Damage Advisor. Sources checked November 13, 2026. This is general educational guidance, not a live warning or an assessment of a particular property.