Well, I don't totally know about it, but I've heard that its power is equivalent to an exploding star:
I find it incredible that Storm occupies the center of the thermodynamics table (it reminds me of a moment in the issue X-men #377), with the potential to reach the extremes between the two temperatures, both with different effects, but which can cause enormous destructive power.
I would love to see Storm accomplish this feat, where Thor says Ororo's power over the cold can bring down the ice giants!
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In a current battle between the two, Storm would win because she has more willpower and control over the weather elements, but in a head-to-head confrontation, I think she would lose, not because she's weak, but because she needs more "superhuman" moments, she is a Goddess, should have, lol.
It depends on the interpretation of each one, I find it more interesting to use the element itself, and thus fold it.
About the sweep of Storm's body in flames, if it weren't for Yukio having thrown the Ororo into the sea, she would have probably died, very interesting that the flames are also phoenix-shaped ..