The phase of the El Niño Southern Oscillation (ENSO) and the Pacific Decadal Oscillation (PDO) serve as some of the best predictors of mid-range climate conditions. This web application provides a tool to explore the interactions of the two oscillations and how they impact Montana climate across the state.
The dataset includes years from 1915-2011. Results are reported as anomalies, or departures from the average values of the entire length of record. The anomalies are calculated as the average of the years between 1915 and 2011 that meet the conditions specified in the drop down menus minus the average of the full historical record. Results are given in millimeters and °C for precipitation and temperature, respectively.
The overall methodology is based on the University of Washington Climate Impact Group's (UW-CIG) Pacific Northwest Climate Maps. If you are interested in more details please visit the UW-CIG About these Maps webpage.
This web application was funded by the Montana Fertilizer Advisory Committee through the MT Fertilizer Tax Research Fund awarded to Dr. Bruce Maxwell, Dr. Judit Barroso, and Dr. Clain Jones, Montana State University, Land Resources and Environmental Sciences. Additional support from the Montana Climate Office.
The web application was inspired by the University of Washington Climate Impact Group's Pacific Northwest Climate Maps.
The interpolated climate data used to calculate the anomalies was provided by: Livneh, B., E. A. Rosenberg, C. Lin, B. Nijssen, V. Mishra, K. M. Andreadis, E. P. Maurer, and D. P. Lettenmaier, 2013: A Long-Term Hydrologically Based Dataset of Land Surface Fluxes and States for the Conterminous United States: Update and Extensions. J. Climate, 26, 9384~9392.
Currently, it is necessary to zoom in and click on the center of a grid-cell to get an accurate anomaly value. Clicking while zoomed out at the state-scale or near the boundaries of a grid-cell will give erroneous values. I am working hard to figure out why this is and will remove this "Bug report" once it is fixed. Thanks for your patience.