Effect of impact of a pure gas comet?

I'm not even sure if gas comets can exist naturally -- feel free to comment on that in the answers. But assume that somehow a large block of frozen hydrogen/helium/oxygen/nitrogen is tumbling through space and approaches earth. As it nears earth, it melts, then boils, but I presume it still holds together as a mass from gravity. Now it hits Earth. What happens? Everything I've read about comet impacts assume some sort of solid core -- ice, stone, metal. Would a gas comet hit us like a big wind, generating a high-pressure region and dissipating? Lots of heat? Or does is there some size where it would have enough coherence that it could still make a crater?

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Effect of impact of a pure gas comet?

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