Water Supply Outlook January 2010

Updated: January 11, 2010

Mountain runoff forecasted natural volumes for March through September 2010

  • Milk River basin
    • Below 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, 2010

    • Oldman River basin: Moderately variable, but generally Average to Above Average.
    • Bow River basin: Highly variable, but generally Average to Above Average.
    • Red Deer: Much above average, based on 2 locatations (Lime and Skoki pillow stations).
    • Upper Peace River basin in British Columbia: Near Normal, as indicated in British Columbia's Snowpack and Water Supply Outlook. Locations near the upper Smoky River basin range from 114 to 145% of normal

    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) as of January 1 2010 is shown here, and as a % of normal here. Although southern plains snowpack is indicated as over 200% of normal, snow water content amounts are only moderate.
    • 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 January 3, 2010 is available here.

    Long Lead Precipitation Outlooks

    Environment Canada (issued on January 1, 2010): normal temperature and precipitation, except below normal precipitation for Southwestern and Northern Alberta, for the January through March 2010 period.

    National Oceanic and Atmospheric Administration (NOAA) (issued on December 17, 2010): below normal precipitation and above normal termperatures in Southern Alberta for January through March 2010.

    Climate indicators: The NOAA reported on January 7, 2010 that El Nino conditions are expected to continue at least into Spring 2010. El Nino strengthened during December 2009.

    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