Convinced the light would disappear again at any moment (especially the way those clouds were scuddering around in the wind), I rushed back in to grab my wee pocket Canon (a PowerShot ELPH). I think it did a pretty decent job, actually, even managing to grab some of that surfspray illuminated mid-air.
Powerfully beautiful, isn't it? Almost makes up for the septic woes. Almost. (Fellow's supposed to arrive this afternoon. Crossing my fingers that diagnostic and repair visit are all one.)