How to Prepare Your Home for a Flood Watch or Warning
Most homeowners know a flood watch is serious — but few have a clear, prioritized action list for what to actually do. The difference between a flood watch and flood warning is also widely misunderstood. Here's what each means and, more importantly, what you should be doing during each window.
The Critical Distinction: Watch vs Warning
| Alert | Meaning | Timeframe | Action Mode |
|---|---|---|---|
| Flood Watch | Conditions are favorable for flooding — it hasn't started yet | 12–48 hours ahead | Prepare. You still have time. |
| Flood Warning | Flooding is occurring or is imminent | 0–6 hours | Act immediately or evacuate. |
| Flash Flood Warning | Rapid flooding is occurring now | Minutes | Evacuate. Do not stay to protect property. |
A flood watch is your operational window. Use it. A flood warning means you're in execution mode. A flash flood warning means human safety overrides everything else.
During a Flood Watch: Your Action List
Exterior (1–2 hours)
- Deploy water-activated flood bags or barriers at doorways, the garage threshold, and any below-grade entries
- Move patio furniture, vehicles, trash cans, and any portable items to higher ground or indoors
- Clear gutters and downspouts if you haven't recently
- Check that sump pump is running and float triggers correctly
- Confirm battery backup is charged
Interior (1 hour)
- Move valuables, electronics, documents, and irreplaceable items from basement and ground floor to upper floors
- Elevate appliances (washer/dryer) if possible using furniture risers or blocks
- Take photos/video of your home's contents — this is your documentation baseline if you need to file a claim
- Locate your main electrical panel and water shutoff. Know where they are before you might need them in the dark.
Administrative (30 minutes)
- Find your flood insurance policy number and carrier contact information
- Charge phones and backup power banks
- Fill your car's gas tank (pumps may be out of service post-storm)
- Withdraw cash (ATMs and card readers go offline)
- Know your evacuation route — decide the trigger condition before you're in a crisis
During a Flood Warning: Execution Mode
At this point, the preparation window is largely closed. Your actions shift to execution:
- Deploy any remaining barriers that weren't placed during the watch
- Shut off electricity to lower floors if water entry appears imminent — do this before water reaches electrical outlets
- Do not use electrical appliances in affected areas
- Monitor water level actively — if rising faster than expected, escalate to evacuation decision
- Keep escape route clear — do not block interior doors with furniture moved from flood path
The Evacuation Decision
If local authorities issue an evacuation order, leave. The legal, safety, and insurance implications of ignoring an official evacuation order are uniformly negative.
Even without an order, evacuate if:
- Water is rising faster than your barriers can contain
- You have children, elderly family members, or pets that would complicate a late departure
- You don't have structural confidence in your home's ability to withstand a serious event
- You live in a mobile or manufactured home (these should always be evacuated during flood warnings)
No property is worth a life. The decisions you made during the watch window are the ones that protect your home. Your job during a warning is to protect yourself.
After the Water Recedes
See our post-flood recovery guide for the step-by-step process for documentation, insurance claims, water extraction, and mold prevention. The first 72 hours after a flood are as important as anything you did before it.
If you haven't already prepared your home for flood season, start with our Spring Prep Checklist — most of the protective measures there can be implemented before the next watch is issued.