Water Supply Outlook January 2015

Updated: January 6, 2015

Mountain runoff forecasted natural volumes for March through September 2015

  • Milk River basin
    • average to above average

    Precipitation can have a major impact on water supply between now and the end of September. The forecasts above assume that precipitation over the remainder of the winter period and through the summer will be normal. However, the range of possible precipitation scenarios is large, therefore probable range forecasts and potential minimum forecasts of natural runoff volumes are also provided. As more information becomes known over time, forecast ranges will narrow. Streamflow volume forecasts are updated monthly from February to May, and again in July.

    Check our Forecaster's Comments for updated information regarding runoff conditions.

    Mountain snowpack

    Snow accumulations measured in the mountains as of January 1, 2015

    • Oldman River basin: Highly variable, but generally below average.
    • Bow River basin: Moderately variable, but generally below average.
    • Red Deer: Below average, based on 2 locations (Limestone Ridge and Skoki Lodge pillow stations).
    • Upper Peace River basin in British Columbia: Data not available.

    It is early in the winter, and snow measurements are only conducted at about half the locations. A full data set will be available in February. Mountain snowpack is an important source of water supply to reservoirs in the spring. Accumulation at this time of year typically accounts for nearly two-fifths of the seasonal total.

    Plains snowpack

    • Information on plains area snowpack will be available in March as snow course measurements will be conducted near the beginning of the month.
    • Environment Canada map of satellite estimation of plains snow water equivalent (SWE): No data available.
    • Alberta Agriculture publishes maps of modelled plains snow accumulations and accumulations as compared to normal.


    Contoured maps of precipitation amounts and as a percent of normal for the past month and for current and recent seasons are available here. Maps of precipitation amounts for the most recent day, week and month to date are available here.

    Soil Moisture

    Alberta Agriculture models soil moisture for non-mountainous, agricultural areas of Alberta. Modelled soil moisture compared to average as of November 30, 2014 is available here.

    Long Lead Precipitation Outlooks

    Environment Canada (issued on December 31, 2014): normal temperatures and above normal precipitation for Central, Southern and Northern Alberta during the January to March 2015 period.

    National Oceanic and Atmospheric Administration (NOAA) (issued on December 18, 2014): below normal precipitation and below normal temperatures in Southern Alberta for January through March 2015.

    Climate indicators: The NOAA reported on December 4, 2014 there is an El Niño Watch. There is an approximately 65% chance that El Niño conditions will be present during the Northern Hemisphere winter and last into the Northern Hemisphere spring 2015.

    Note that forecasting weather for such a long time period into the future is very difficult, and so the historical accuracy has been variable, dependent on location and time period, and is often low, more so for precipitation than temperature. Environment Canada provides an assessment of their forecast method's historical accuracy on their website.

    Reservoir storage

    Water storage volumes in the major irrigation and hydroelectric reservoirs of the Milk, Oldman, Bow, Red Deer North Saskatchewan, and Athabasca River basins is updated each weekday and is available in the Provincial Reservoir Storage Summary.


    Background information on the Water Supply Outlook is available in Frequently Asked Questions

    Media Contact:
    Communications Division, Alberta Environment
    Phone: (780) 427-6267