Minigunner
Terrarian
The way I see it, slimes probably wouldn't be able to hold their form so well in weather conditions as chaotic as a Thunderstorm, so I whipped up these sprites for the regular slimes to show what heavy wind (and/or rain) could do to them. I think adding something like this would add another dramatic effect to Thunderstorms.
The ripple effect itself could probably be done as a post-process effect rather than manually edited in like shown here.