Dear Lazyweb: gweather icons?

Like most pilots, I’m a weather junkie. I need a regular weather fix even if I’m stuck indoors and not flying. GNOME’s Weather Report panel applet (gweather-applet, technically) is a great fast fix if all I need to know is “Is it raining at the airport right now?”

GNOME Weather Report

Aside from fantastic customisability, gweather has really cool icons for seemingly every combination of weather conditions. I’d love to use some of these icons in my own work (as per whatever license they’re under, of course!) but I can’t seem to find them on my /system files. There must be some way to coax this information out of my system (Ubuntu 8.04 Hardy Heron) but my commandline-fu is weak in this.

So, anyone know where gweather tucks it’s icons away?