why couyldn't he do the same to spidey then?? spidey beat him w/ electricity before and storm can make the electricity stronger than the few wires spidey was using. besides she can just pick him up in a big tornado like the ones above the ocean and try to keep him in there and shock him from there. besides water can evaporate from heat and she can make it over 100 and can keep blasting him w/ lightning which can be over 50,000 degrees
Storm can generate from her body what she calls lightning but in real world terms its an electrical discharge with the same power level as lightning. This electricity she generates herself can flow from her continuously as she has displayed countless times throughout the years and storm has mental control over its flow and can change its direction so wherever hydro goes it will hit the mark. Not only that but she can also summon actual lightning simultaneously. Storm is also capable of dramatically and quite speedily reducing the ambient moisture in the air. If spiderman can beat hydro with an electric cable then storm who can summon lightning, generate her own electrical discharges and dramatically reduce ambient moisture in the air could easily win. All she would hav to do is avoid his attacks which her flight capabilities and atmospheric control should anable her to do. I know some of u hate storm but its like accepting someone could beat a robot with a magnet then arguing against magneto being able to do the same.
Storm is highly resistant to atmospheric changes be they temperature or humidity related she can reduce or increase the humidity and ambient moisture levels in and around her person as all xmen readers know she has displayed before. Hydros ability to reduce the moisture in someones body to my knowledge has never been used to take out spiderman his major enemy and while i dont think she would be able to hold out indefinitely her natural high resistant to such changes within and around her person plus the nature of her abilities would allow her to resist and hold out long enough for her to evaporate that mutha.