Hmmmm. Maybe the cables are exposed somewhere, so the storm affects the hardwiring, thus affecting the wifi? I haven't had this happen before, but whenever the net has an issue, my hardwired modem goes down, so therefore so does my wireless. The router is attached to the hardwire modem right, giving you internet? It must be something with the cables underground and the rain. My grandma's phone goes out when it rains. Same concept?