Skies were overcast until approximately 12:30am local time when it cleared. Bitter cold, -15F with sustained and gusting winds between 35 & 55 mph. Had two solid hours of continuous display. Quite active. Primarily overhead and to the south (which is unusual and the pink lights of Fairbanks to the south showed up). The brighter colors were not visible to the eye, but with the longer exposures, quite nice. Nikon D3s ISO's 3200 and 6400, 16mm f2.8 and 14-24 f2.8. 3-5 secs @ f2.8.