[Captain Tom]

For immediate protection get a small poly/tarp that will cover the roof and at least halfway down all the windows around it. Secure it with bungee cords that have hooks, clipping them onto the wheels or fender arches at the wheels. And then hope it's not too windy.

Plan B - park it inside a public garage or a hotel garage or in a friend's garage til the weather breaks.

 

[Captain Tom]

.... maybe you or someone can point to the drain holes....

 

[Captain Tom]

I looked into the crevices with a flashlight and I don't see anything even remotely resembling a drain hole. Of course it doesn't help that the car is 120°F and burned me right through my shirt, but I digress.

Can you please post another photo looking at that corner from the center of the car looking a bit to the left?

 

[Captain Tom]

Try finding the hole in the upper left corner where the purple circle is in this markup of your first photo. It's underneath the bottom edge of the wind deflector netting on our '12 S60.

 

[Captain Tom]

Here's where it is on ours. Follow the clothesline....

When you locate it on your car park it with that drain "downhill" or at least with the car parked flat. Add water in that area. See if it backs up. Your drain, or at least the 'gutter' around your sunroof, looks dry in that photo.

 

[Captain Tom]

It's progress on two fronts.
A. You ruled out the front left sunroof drain hose.
B. You have the top of the roof covered before the storm hits.

Here's a thread that includes some info about the windshield leaking. On a '12 S60. Post #28 is worth a look. You probably have time to check the whole thread.

The thread also has clues about removing the A-pillar trim as well as hints on cleaning up water stains on the trim pieces or the carpets. Whatever you do make sure the interior doesn't stay wet too long.....mold/mildew and all that, as you probably know in your area.