Standard National Flood Insurance Program policies generally do not take effect until 30 days after purchase. A named storm already approaching is too late — and insurers typically stop writing new policies when a storm is named.
What this means in practice
- If you do not have flood insurance today, you almost certainly cannot get it in time for a storm that is already forecast.
- There are limited exceptions to the 30-day rule (for example certain loan-related and map-revision situations). Confirm your own situation with an agent rather than assuming.
- Homeowners policies generally exclude flood. "Water damage" in a homeowners policy usually means burst pipes, not rising water.
If you have no flood coverage and a storm is coming
- Move valuables up and out of flood-prone areas — off floors, out of garages, upstairs if possible.
- Document everything now. You may still have a claim under another coverage, and proof of what you owned matters regardless. See Document Your Home Before the Storm.
- Photograph the water line if flooding occurs, before it recedes and before you clean anything. That photograph is the evidence of how high it reached.
- Buy flood coverage anyway, for the next storm. The 30 days starts when you buy it. This is the entire argument for doing it on a sunny day.
General information, not insurance advice. Coverage terms, waiting periods and exceptions vary. Confirm with your insurance agent and the National Flood Insurance Program.