Precipitation, Aerosols, and Pacific Atmospheric Rivers Experiment
photo by Jessie Creamean
CalWater is a field campaign focusing on two key phenomena that play key roles in the variability of the water supply and the incidence of extreme precipitation events along the West Coast of the United States. These phenomena include the role of:
  1. Atmospheric Rivers (ARs) in delivering much of the water vapor associated with major storms along the U.S. West Coast, and
  2. Aerosols from local sources as well as those transported from remote continents—and their modulating effects on western U.S. precipitation.

Observation Platforms

The CalWater 2/ACAPEX observational strategy will use high- and low-altitude aircraft, a ship with the AMF2, and a ground-based network.

Terrain Base Map

Terrain base map of northern California showing wind profiler sites and S-PROF radars operation during the HMT and CalWater field campaigns (pink circles and red triangles, respectively).

Recent News and Announcements

18 December 2014 – Press Conference held at AGU Fall Meeting in San Francisco, CA
At right: Download the new handout about the experiment
link to pdf
12 December 2014 – Scientists use Major West Coast Winter Storm to Prepare for Upcoming Field Experiment pier image from Scripps