The Vog Measurement and Prediction Program (VMAP) provides real-time vog forecasts. With the help of our project collaborators vog forecasts are available to the public through this web site. Comments and inquiries can be directed to the appropriate contact. We welcome constructive comments from all VMAP users, and strive to provide the best possible service consistent with our mission and resources. Inquiries into actual measured values and concerns regarding hazardous conditions should be directed to the appropriate agency such as the Hawaii State Department of Health (HDOH). The VMAP website is intended to be complementary to the data provided by other state and federal agencies.

Vog is primarily a mixture of sulfur dioxide (SO2) gas and sulfate (SO4) aerosol. SO2 (invisible) reacts with oxygen and moisture in the air to produce SO4 aerosol (visible). SO2 is expected to be the main problem in areas near the vent (Hawai`i Volcanoes National Park, Pahala, Na`alehu, Hawaiian Ocean View Estates) and SO4 aerosol is expected to be the main problem at locations far from the vent (Kona and farther north and west). For more information on vog visit the FAQ page here.

Disclaimer: The information contained in the VMAP website is for general information purposes only. While we endeavor to keep the information accurate and up-to-date, we make no representations, warranties, or guarantees about the completeness, accuracy, reliability, suitability, or availability with respect to the VMAP website or the information, products, services, or related graphics contained on the VMAP website for any purpose. Although every effort is made to avoid interruptions to VMAP access, any reliance upon any information presented is strictly at your own risk. In no event will the University of Hawaii at Manoa, the UH-M Department of Atmospheric Sciences, the VMAP team, or any personnel or collaborator associated with VMAP be liable for any losses or damages (direct or indirect) without limitation whatsoever in connection with the use of the VMAP website. The general public is welcome to use the VMAP at this time and by its use implicitly agrees to the terms of this disclaimer.


Vog Forecast Discussion

Big Island logo image

Forecast discussion explains the expected distribution of vog concentrations over the Hawaiian Islands as a result of the interaction of the volcanic emissions and the current and forecast weather. (Photo credit: Mila Zinkova)

Vog Model

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The Vog model guidance page provides output in graphical form from the HYSPLIT dispersion model.

Model Performance

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The model performance page is being revamped and will return with exciting new graphics and content.

University of Hawai‘i at Mānoa

  • Steven Businger, Director, Dept. of Atmospheric Sciences (ATMO)
  • Lacey Holland, Dept. of Atmospheric Sciences (ATMO)
  • Tiziana Cherubini, Dept. of Atmospheric Sciences (ATMO)
  • Ryan Lyman, Dept. of Atmospheric Sciences (ATMO)
  • Ron Merrill and David Schanzenbach (ITS)


News and Items of Interest

Recent Publications