Glad it still worked out for you especially with the luck of booking a hotel near Haneda.

I've seen some Sept 11 2025 videos of people driving through flooded areas and others walking barefoot down flooded metro stations & streets. Some people got stuck in a basement restaurant which was flooding down the stairs so empty stomach due to being driven back by the weather almost fortunate to bypass that type of "adventure". Sometimes you can find a vending machine with instant noodles or beer snacks in the hotel or buy a snack from airport convenience store on arrival, before you go to your hotel especially if isn't connected to the airport.

I usually pick up some shelf stable snacks and water & pre-charge devices if there is a typhoon warning while I'm traveling in Japan. A bit cautious but it can take a while for things to resume. As long as you're safe, dry, and fed, it's just easier to take it all in stride.