You've not added any stabilizer since being here, did you add any in before or have it checked before?
It could be right. especially if it was low at start, and you've had to add a lot of water. Your FC drops will drop quickly, which it needs to come down a lot to compensate, with a 0 CYA so if it is correct that should be your 1st adjustment. Then Per Pool Math CYA calculation for your pool size. You'll want it around 40-50ppm (no higher so shot for 40ppm, and if it goes over a little you'll still be below 50ppm).
We'll see how OCLT goes tonight, and go from there but do recheck the CYA and add accordingly if correct because it will help that chlorine hold a lot.
Sounds good ride the storm out shut off pump if lightening and get ya some rest
Edited for addition of content: Here is the Chlorine cya chart your Shock level for current CYA is only like 10-12 ppm, so start letting it drop some to avoid any equipment damage.
The dry stabilizer 100% cyanuric acid is what you need to get. I have a pic of the last batch I bought if unsure what to get. The dry powder form CYA can take a week to show up so it should be fine to add while allowing those levels to come down. http://www.troublefreepool.com/content/128-chlorine-cya-chart-slam-shock
Are you familiar with how to do the Sock method for adding CYA by placing it in front of the return? If not holler and I've got a pic I can give you of what it looks like too.
As you can see from your CC readings (1.5 in both tests you've posted), you're not quite done yet with elimination of algae, even though the pool looks much improved from your impromptu SLAM process. So, you'll want to keep your FC level high enough to continue the SLAM, using the chlorine/CYA chart to find the right level of chlorine for your CYA. Once you start adding CYA, dose with chlorine according to the target level of CYA you're aiming for. For example, if someone is currently at 20 CYA and has just put stabilizer in a sock in the pool to go up to 40, they would use a SLAM FC target as if that 40 ppm CYA were already fully dissolved.