The following conditions influenced this month's forecasts:

Precipitation:
Seasonal October through May precipitation was 90 percent of average in the Upper Green basin. May precipitation was 120 percent of average.

Snow:
On June 1st, the basinwide snowpack was 95 percent of average. However, the upper part of the basin, above 10,000 feet in elevation, is not gaged. The water year snowpack peaked on April 15th at much below the average peak.
--- Upper Green basin snow water equivalent plot.

Streamflow:
May streamflow was near 20 percent of average.

Soil Moisture:
Modeled soil moisture states ranged from below average to near average heading into the winter.

Climate Forecasts:
Climate forecasts were not a factor because there is not a strong correlation between El Nino conditions and winter precipitation in the Upper Green basin.

Forecast Summary:
Due primarily to the much below average water year peak snowpack, the April through July streamflow volume forecasts are much below average. These forecasts range between 47 and 73 percent of average, with a median value of 55 percent. The June through July streamflow volume forecasts range between 54 and 82 percent of average, with a median value of 60 percent.

The following conditions influenced this month's forecasts:

Precipitation:
Seasonal October through May precipitation was 95 percent of average in the Yampa/White basin. May precipitation was 110 percent of average.

Snow:
June 1st snow water equivalent was 80 percent of average in the basin as a whole. The seasonal snowpack peaked on April 10th at 80 percent of the average peak. This year cooler temperatures retained some of the snowpack later into the season.
--- Yampa basin snow water equivalent plot.

Streamflow:
May streamflow was near 85 percent of average.

Soil Moisture:
Modeled soil moisture states were near average heading into the winter for the Little Snake and White River basins. Modeled states ranged from below average to near average heading into winter for the Yampa basin.

Climate Forecasts:
Climate forecasts were not a factor because there is not a strong correlation between El Nino conditions and winter precipitation in the Yampa/White basin.

Forecast Summary:
Due to the near average precipitation to date, and because some of the snowpack was retained later into the season because of cooler temperatures, the April through July streamflow volume forecasts are near average at this time. These forecasts range between 54 and 128 percent of average, with a median value of 105 percent. The June through July streamflow volume forecasts range between 51 and 115 percent of average, with a median value of 80 percent.

The following conditions influenced this month's forecasts:

Precipitation:
Seasonal October through May precipitation was 80 percent of average in the Duchesne basin. May precipitation was 90 percent of average.

Snow:
June 1st snow water equivalent was 85 percent of average in the basin as a whole.
--- Duchesne basin snow water equivalent plot.

Streamflow:
May streamflow was near 40 percent of average.

Soil Moisture:
Modeled soil moisture states were much below average to below average heading into the winter.

Climate Forecasts:
Climate forecasts were not a factor because there is not a strong correlation between El Nino conditions and winter precipitation in the Duchesne basin.

Forecast Summary:
Due to below average water year precipitation, below average seasonal snowpack, and much below average soil moisture heading into winter, the April through July streamflow volume forecasts continue to be much below average. These forecasts range between 34 and 76 percent of average, with a median value of 55 percent. The June through July streamflow volume forecasts range between 25 and 73 percent of average, with a median value of 65 percent.

The following conditions influenced this month's forecasts:

Precipitation:
Seasonal October through May precipitation was 95 percent of average in the headwaters of the Lower Green basin. May precipitation was 90 percent of average.

Snow:
June 1st snow water equivalent was 50 percent of average in the Price and San Rafael basin. Elsewhere within the Lower Green the snow was essentially depleted.
--- Price basin snow water equivalent plot.

Streamflow:
May streamflow was near 50 percent of average.

Soil Moisture:
Modeled soil moisture states were much below average heading into the winter.

Climate Forecasts:
Climate forecasts were not a factor because there is not a strong correlation between El Nino conditions and winter precipitation in the Lower Green basin.

Forecast Summary:
Due to the below average seasonal snowpack, and the much below average soil moisture heading into winter, the April through July streamflow volume forecasts continue to be much below average. These forecasts range between 32 and 61 percent of average, with a median value of 45 percent. The June through July streamflow volume forecasts range between 45 and 65 percent of average, with a median value of 50 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).