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After early forecasts showed Hurricane Ana threatening the Hawaiian Island chain, Ana missed a direct hit on both U.S. Climate Reference Network sites on the Big Island. Maximum sustained winds reached 85 mph about 150 miles southwest of Kailua-Kona, but the main onshore impacts were due to heightened surf and heavy rains. Ana did bring a record 24-hour rainfall to the Mauna Loa station, with 5.38 inches falling between sunset on October 17 and sunset on October 18. However, there were no particularly high intensity short duration rainfall periods or wind gusts. The USCRN station at Hilo also received more than five inches of rain from Ana, as did much of the windward portion of the island, triggering local flash flooding and stream flooding. For more information, including a discussion of the Hawaiian snow that preceded the arrival of Ana, please see the full article.

USCRN Overview

The U.S. Climate Reference Network (USCRN) consists of 114 stations in the conterminous U.S.; an eventual total of 29 stations in Alaska (with 16 as of the end of the summer of 2014); and 2 in Hawaii, that are developed, deployed, managed, and maintained by the National Oceanic and Atmospheric Administration (NOAA) in the continental United States for the express purpose of detecting the national signal of climate change. The vision of the USCRN program is to maintain a sustainable high-quality climate observation network that 50 years from now can with the highest degree of confidence answer the question: How has the climate of the nation changed over the past 50 years? These stations were designed with climate science in mind. Three independent measurements of temperature and precipitation are made at each station, insuring continuity of record and maintenance of well-calibrated and highly accurate observations. The stations are placed in pristine environments expected to be free of development for many decades. Stations are monitored and maintained to high standards, and are calibrated on an annual basis. In addition to temperature and precipitation, these stations also measure solar radiation, surface skin temperature, and surface winds, and are being expanded to include triplicate measurements of soil moisture and soil temperature at five depths, as well as atmospheric relative humidity. Experimental stations have been located in Alaska since 2002 and Hawaii since 2005, providing network experience in polar and tropical regions. Deployment of a complete 29 station USCRN network into Alaska began in 2009 and should be complete by 2022. This project is managed by NOAA's National Climatic Data Center and operated in partnership with NOAA's Atmospheric Turbulence and Diffusion Division.

Our full list of publications includes information on how to best cite USCRN data use.

USCRN Station