Measurements at NOAA's Mauna Loa Observatory stopped following the recent eruption of the Mauna Loa volcano, when lava flow blocked staff access and took out power lines to the facility.

Under an emergency agreement, NOAA and the University of Hawaii have established a temporary measurement site at the nearby Mauna Kea volcano for the critical CO2 record and other atmospheric measurements taken at the observatory.

Media can contact: Theo Stein (303) 819-7409 ( or Karin Vergoth 303-632-6413‬ (


NWS logo National Weather Service Honolulu Forecast Office

What does this program measure?

The Max/Min Temperature Unit records 24 hour Maximum/Minimum temperatures in degrees Fahrenheit. The Standard Rain gauge records 24 hour rainfall in hundreds of an inch.

How does this program work?

The data is measured manually by MLO personnel and and relayed to the Honolulu Forecast office by telephone through the ROSA system.

  • A 20-cm rain gauge is recorded 5 times per week at MLO.
  • A 20-cm rain gauge is recorded 1 time per week at Kulani Mauka.
  • A rain gauge and tipping bucket are measured continuously at MLO.

Why is this research important?

The temperature and rainfall data are transmitted daily via telephone to the Honolulu Forecast office through a network called PRONET which is entered in the AWIPS computer bank to be used as a forecasting aid.

Are there any trends in the data?

The data are used by the Forecast Office as a guide in updating their forecast. The data are mainly used as “real time” data.

How does this program fit into the big picture?

What is it's role in global climate change?

Same as above.

Comments and References

Lead Investigator(s):

Wilfred Laplante

MLO Contact(s):

David Nardini
808-933-6965 (x229)
Paul Fukumura
808-933-6965 (x223)

Web Site(s)

Date Started

December 23, 1998

Related Programs

NWS Max Min Temperature

NWS Meteorology Sensor
Temperature sensor
8 Inch Rain Guage at MLO
8" rain guage sampling tube

Dipping Stick For 8 Inch Rain Guage
Measuring rain

Measuring Rain at MLO
Measuring stick

Dialing ROSA info
Dialing info in to ROSA