Note: This publication is currently undergoing major revisions. The current publication will be replaced with a new publication based on stakeholder requirements and scientific advances. We expect to begin sharing details on this soon. If you have input on content, format, or publication frequency at any time, please contact us at cbrfc.webmasters@noaa.gov.San Juan Water Supply Outlook, January 1, 2009
-Model Soil Moisture/Observed Streamflow...Soil moisture for most of the upper basins in the San Juan
were below average in the fall. This was most likely due to limited monsoonal precipitation over the
summer months. Observed streamflow for the month of December was mostly below average for the San Juan.
-Snowpack/Precipitation...Snowpack above Navajo Reservoir is currently 130 percent of average
while the Animas was 135 percent. Precipitation over the San Juan Basin for December was much above
average with 220 percent. Seasonal average precipitation for the San Juan Basin increased to 115 percent.
-Short Term Precipitation Forecast...The forecast models through next week keep the San Juan Basin
relatively dry with near average temperatures.
-General Discussion...The current snowpack and statistical forecast suggest the April-July forecast of
115 to 120 percent of average. However, the ESP guidance suggests a forecast of around 110 percent of
average due to lower than average soil moisture. The CPC guidance continues to show the possibility of
increased chances of below average precipitation for January through March across the San Juan Basin.
Differences between the full period forecasts and the residual forecasts may not exactly equal the actual observed volumes due to rounding conventions (see Definitions section).