UPDATE – (5 p.m.) – Episode 28 in the ongoing Kīlauea summit eruption ended abruptly at 1:20 p.m. HST. High lava fountaining lasted about 8 hours, and reached heights of approximately 1,200 ft (365 m).

The USGS Hawaiian Volcano Observatory says the end of the episode coincided with a change from deflation to inflation, and a decrease in seismic tremor intensity.

USGS webcam view of Episode 28 on Wednesday morning

(BIVN) – Episode 28 in the ongoing eruption at the summit of Kīlauea volcano got underway Wednesday morning. 

The latest episode began at 4:10 a.m. HST on July 9, and by 6 a.m., lava fountains from the north vent reached approximately 1000 feet (305 meters) high. 

UPDATE – (8:15 a.m.) – The Hawai’i County Civil Defense issued an alert to residents, advising:

• Tephra from the eruption is falling on Highway 11 between the 36 and 40 mile markers; drive with caution
• Expect slow moving traffic and traffic congestion in and around the National Park.  
• Please drive with caution as pedestrians and vehicles may be on or near roadways.

Volcanic ash, pumice, and Peleʻs hair were being blown to the south-southwest of the vent. “According to USGS weather stations just southwest of the summit, winds are blowing from the north-northeast direction at approximately 15 miles per hour, which suggests that volcanic gas emissions and volcanic material will be distributed south-southwest,” the USGS Hawaiian Volcano Observatory wrote in a 5 a.m. Volcanic Activity Notice, adding “such trade winds typically turn more to the northeast during daylight hours.” 

The plume from Episode 28 can be seen reaching thousands of feet into the air on this USGS webcam view from Mauna Loa Strip Road.

From the USGS HVO:

Episode 28 was preceded by gas pistoning cycles, some of which produced small lava overflows at the north vent yesterday. Fountains from the north vent are currently 150 feet (45 meters) high and feeding multiple lava streams at 5 a.m. HST.

Inflationary tilt reached approximately 14 microradians since the end of the last episode. Seismic tremor began increasing and tilt at UWD switched from inflationary to slightly deflationary at about 4:15 a.m. HST, a few minutes after lava flows began erupting onto the crater floor.

Most episodes of Halemaʻumaʻu lava fountaining since December 23, 2024, have continued for around a day or less and have been separated by pauses in eruptive activity lasting generally at least several days.

The USGS Volcano Alert Level/Aviation Color Code for Kīlauea remain at WATCH/ORANGE. All current and recent activity is within Hawaiʻi Volcanoes National Park.