In what context can we use them both? E.g can I say hay/hace una tormenta? Or ... Hay/hace mucho frío?
No, I'm afraid that when talking about the weather it is all idiomatic and these are "fixed" expressions. Some use "hay", some use "hace", but you can't mix them up...
It may vary a little bit from region to region, but we have reflected in the lesson what we consider is the general usage in most Spain.
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