What is the temperature of thunderstorm clouds, where the lightning has been? It is possible to seed the clouds simply with water at \(\approx80^oC\).
If water is sprayed, it will have to be hotter at the nozzle such that the fine mist that forms at the end of its trip is at \(80^oC\).
What you would see is lightning, as the spray mixes with the clouds.
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