Just because schools may not be having classes for students this Thursday and Friday does not mean that schools will necessarily be closed. Some will be serving a role that is invaluable to the community that goes beyond the classroom.
If you read anything about evacuation shelters in places like Houston and Florida last year, you may have seen that many of those shelters were local public schools.
Here in North Carolina, it is no different.
Check out https://www.ncdps.gov/florence.
Those schools in my opinion are high-performing. Don’t need an secret algorithm to calculate that.