Overnight
The tsunami that is white is the most scary tsunami of all. It doesn't come in and destroy everything. No, it comes in, goes inside your door, then stays at your place overnight, without even asking!
Imagine the white tsunami knocking on your door, walking into your house, and then just laying down on your bed. You try to tell it to leave, but it's a tsunami, and it says it will be staying overnight thank you very much.
はく
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Your cat walks up to the white tsunami that's staying overnight and decides it doesn't like it, so it hacks (はく) up a hairball on it. Even that doesn't get the tsunami to leave.
See the hairball slowly sinking into the tsunami. The cat hacks up another one.