Lava fountains and flows erupted primarily from the north vent, and the south vent was largely obscured by the north vent activity. Fountains from the north vent quickly reached estimated heights of more than 500 feet, according to scientists with the USGS Hawaiian Volcano Observatory.

Night-time incandescence from episode 21 lava deposits was visible near the active vent region and along the northern margin of Halemaumau crater.” No significant activity has been noted along Kilauea’s East or Southwest Rift Zones.