skip to main content


This content will become publicly available on October 30, 2018

Title: The Olympic Mountains Experiment (OLYMPEX)

The Olympic Mountains Experiment (OLYMPEX) took place during the 2015/16 fall–winter season in the vicinity of the mountainous Olympic Peninsula of Washington State. The goals of OLYMPEX were to provide physical and hydrologic ground validation for the U.S.–Japan Global Precipitation Measurement (GPM) satellite mission and, more specifically, to study how precipitation in Pacific frontal systems is modified by passage over coastal mountains. Four transportable scanning dual-polarization Doppler radars of various wavelengths were installed for this study. Surface stations were placed at various altitudes to measure precipitation rates, particle size distributions, and fall velocities. Autonomous recording cameras monitored and recorded snow accumulation. Four research aircraft supplied by NASA investigated precipitation processes and snow cover, and supplemental rawinsondes and dropsondes were deployed during precipitation events. Finally, numerous Pacific frontal systems were sampled, including several reaching “atmospheric river” status, warm- and cold-frontal systems, and postfrontal convection.
 [1] ;  [2] ;  [3] ;  [4] ;  [5] ;  [2] ;  [2] ;  [2] ;  [6] ;  [7] ;  [8] ;  [9] ;  [10] ;  [11] ;  [2] ;  [2] ;  [2] ;  [12] ;  [13] ;  [6]
  1. Univ. of Washington, Seattle, WA (United States); Pacific Northwest National Lab. (PNNL), Richland, WA (United States)
  2. Univ. of Washington, Seattle, WA (United States)
  3. NASA Marshall Space Flight Center, Huntsville, AL (United States)
  4. NASA Goddard Space Flight Center (GSFC), Greenbelt, MD (United States)
  5. Olympic National Park, Port Angeles, WA (United States)
  6. Colorado State Univ., Fort Collins, CO (United States)
  7. Environment and Climate Change Canada, King City, ON (Canada)
  8. California Inst. of Technology (CalTech), Pasadena, CA (United States). Jet Propulsion Lab.
  9. Univ. of Utah, Salt Lake City, UT (United States)
  10. Univ. of North Dakota, Grand Forks, ND (United States)
  11. Univ. of California, Los Angeles, CA (United States)
  12. National Center for Atmospheric Research, Boulder, CO (United States)
  13. Pacific Northwest National Lab. (PNNL), Richland, WA (United States)
Publication Date:
Report Number(s):
Journal ID: ISSN 0003-0007
Grant/Contract Number:
AC05-76RL01830; NNX12AL54G; NNX13AO58G; NNX14AJ72G; NNX14AO64G; NNX15AL38G; NNX15AT26G; NNX16AD75G; NNX16AK05G; AGS-1503155
Accepted Manuscript
Journal Name:
Bulletin of the American Meteorological Society
Additional Journal Information:
Journal Volume: 98; Journal Issue: 10; Journal ID: ISSN 0003-0007
American Meteorological Society
Research Org:
Pacific Northwest National Lab. (PNNL), Richland, WA (United States); Univ. of Washington, Seattle, WA (United States)
Sponsoring Org:
USDOE Office of Science (SC), Biological and Environmental Research (BER) (SC-23); National Aeronautic and Space Administration (NASA); National Science Foundation (NSF)
Country of Publication:
United States
OSTI Identifier: