This combination is not too frequent.

I met once that combination Storm Porch when they spoke on a place with huge amounts of snow falling in winters (Alaska?). By that SP they meant a secondary entrance (not so pretty as the main entrance) which was easily opening and leading to the road.

The second meaning I can recall is a part on ship's deck covered by roof for passage in storm conditions.

Recall also that "storm door" means the outer door when you have double doors.

I would like to congratulate you with coming New Year!

Sincerely yours,
Dr. T.S. Tagirov