Greetings,
I am sorry to hear of this disaster.
An effective tried-and-true method is to get an aerial/satellite view of the area you wish to influence.
Vibrate a Sanskrit mantra for water (or a rune with watery properties) while visualizing clouds gathering and raining/flooding/ etc. on the area you wish to affect.
This is an old and extremely effective method that still used and taught by many occultist and remote influencers.
Its applications can range from influencing the weather on a specific area to encouraging destruction of an area (eg. from a close-up satellite view-- seeing bombs being dropped on Israel's crowded wailing wall).
Here's a great link for looking up words in Sanskrit. You can experiment with them and ask here if you need help with their proper pronunciations.
https://dsal.uchicago.edu/dictionaries/macdonell/
HS.