Is this a spike on this Phal?

[Skycat]

Awesome! I thought I'd need to put my Phals outside for the temperature drop before any of them would spike (I hadn't put them outside already because I never got around to figuring out where I'd put them where they'd get light, but not have all these thunderstorms dump a ton of rain into their crowns... also I wasn't sure they'd like all the 90+ degree days)