A small leak is a big deal
Mitigation means acting quickly to stop the damage from getting worse, without necessarily fixing the damage. The key to storm mitigation is stopping water leaks and minor flooding so materials can dry within 24-48 hours. This prevents the further damage of structural weakening or wood rot, and stops the growth of mold on damp surfaces.
Even while it is still raining or an active leak is present, there are ways to mitigate the damage. The key is to not wait. Even if your home has been spared from acute flooding, what seems like "minor" water damage from leaks and other water intrusions can turn into major problems over time – and need to be addressed immediately.
When a leak is discovered do not delay calling to get the clean up started.