As of the morning of November 29, lava from the eruption of the Mauna Loa volcano on Hawaii's Big Island has been confirmed to have crossed the access road to NOAA's Mauna Loa Observatory and taken out power lines to the site. These circumstances have resulted in a pause in data being collected at the observatory.

All NOAA staff from the Mauna Loa Observatory are safe.

At this point the facility is not accessible.

NOAA will continue to provide updates as the situation develops.

Media can contact: Alison Gillespie 202-713-6644 ( or Karin Vergoth 303-632-6413‬ (

General Information

Weekly ozonesondes are released from the balloon launch facility shared with the National Weather Service. From these sounding are obtained profiles of temperature, humidity, wind speed and direction, and ozone concentrations from sea level to 35 km altitude. This site is also the location for the MLO measurements of both wet and dry precipitation for the Hilo area. Hilo may have up to 200 inches (500 cm) of precipitation per year whereas the mountain site may have only 10% or less of that amount.




GPS Information

Latitude: 19.72° N
Longitude: 155.07° W
Elevation: 11m(36ft)
Time Zone: HST(-10 GMT)