Applications deployed unto the Google App Engine would not be affected by the Hurricane. When applications are deployed to the Google App Engine, the files and application are stored at remote locations rather than on local hard disks or disk-based storage. Copies of these files are safely stored in different locations all around the world.
That being said, the
documentation explains in more details disaster recovery plans in Google Cloud Platform. Similarly, more details are shared on this
documentation about how to protect your application against the unlikely event of the loss of an entire region due to natural disaster, using a disaster recovery plan.
I suspect that your VM Instance is not necessary an App Engine Instance, can you kindly confirm which Instance you refer?