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.Upper Colorado Water Supply Outlook, January 1, 2011
Upper Colorado Water Supply Outlook, January 1, 2011
The following conditions influenced this month's forecasts:
Precipitation:
Seasonal October through December precipitation
was near 155 percent of average in the Upper Colorado mainstem basin.
December precipitation was near 195 percent of average.
Snow:
January 1st snow water equivalent was near 145 percent of average in the basin
as a whole; this is 60% of the seasonal peak.
--- Upper Colorado basin snow
water equivalent plot
Streamflow:
December streamflow was near 120 percent of average.
Soil Moisture:
Modeled soil
moisture states were near to above average heading into the winter.
Climate Forecasts:
Climate forecasts were not a factor because there is not a strong correlation
between La Nina conditions and winter precipitation in the Upper Colorado mainstem basin.
Forecast Summary:
Monthly precipitation has been above to much above average in the Upper Colorado
mainstem each month of the water year so far, with December being the highest
yet. As of January 1st both the seasonal precipitation and snow water
equivalent are near 150% of average. However, it is early in the snow
accumulation period (January 1st snow water equivalent is 60% of the average seasonal peak)
and our models assume near normal precipitation into the future.
Therefore, current April through July streamflow volume forecasts
range between 113 and 139 percent of average with a median value of 120 percent.
The following conditions influenced this month's forecasts:
Precipitation:
Seasonal October through January precipitation was 150 percent of average
in the Gunnison basin. December precipitation was 210 percent of average.
Snow:
January 1st snow water equivalent was 160 percent of average in the Gunnison basin.
--- Gunnison basin snow
water equivalent plot
Streamflow:
December streamflow was 115 percent of average.
Soil Moisture:
Modeled soil
moisture states were below to near average heading into the winter.
Climate Forecasts:
Climate forecasts were not a factor because there is not a strong correlation
between La Nina conditions and winter precipitation in the Gunnison basin.
Forecast Summary:
January precipitation throughout the Gunnison basin was 210% of average. January 1st snow water equivalent for the Gunnison was much above average
with 160%. However, it is early in the snow accumulation period (January 1st snow water equivalent is 65% of the average seasonal peak)
and our models assume near normal precipitation into the future. Therefore, current April through July streamflow volume forecasts
range between 103 and 146 percent of average with a median value of 115 percent.
The following conditions influenced this month's forecasts:
Precipitation:
Seasonal October through January precipitation was 140 percent of average
in the entire Dolores basin. December precipitation was 220 percent of average.
Snow:
January 1st snow water equivalent was 125 percent of average in the Dolores basin.
--- Dolores basin snow
water equivalent plot
Streamflow:
December streamflow was 115 percent of average.
Soil Moisture:
Modeled soil
moisture states were average to slightly below average heading into the winter.
Climate Forecasts:
The correlation of El Nino and April through July water volumes in the Dolores basin is small that
it did not influence the forecast process.
Forecast Summary:
January precipitation throughout the Dolores Basin was 220% of average. Seasonal October through January precipitation in the Dolores basin was much above average with
140%. However, it is early in the snow accumulation period (January 1st snow water equivalent is 50% of the average seasonal peak)
and our models assume near normal precipitation into the future. Therefore, current April through July streamflow volume forecasts range between
106 and 109 percent of average, with a median value of 105 percent.
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).
Reservoir Monthly Inflow Forecasts
Upper Colorado End of Month Reservoir Contents (kaf)