Storm drops will usually occur in late midgame when the cost of a medic is pretty much nothing relative to your income.
Having 1 medic will probably mean all of your SCVs are healed back to 60hp by the time the next drop happens. I'd keep the medic slightly away from the mineral line so she doesn't die to the actual storm.
That's all, I thought this might be a useful 'niche idea' and fun to read. I hope someone finds it interesting enough to try out.
I plan to share some other ideas about niche tactics in the coming time.