The following conditions influenced this month's forecasts:

Precipitation:
Seasonal October through May precipitation was 80 percent of average in the Upper Green basin as a whole. May precipitation was 45 percent of average. May was the third month in a row with much below average precipitation.

Snow:
On June 1st, only two SNOTEL locations in the Upper Green had any remaining snow. The snow water equivalent for these two sites was 25 percent of average. As of June 5th, these locations have melted out. It is important to note that the highest measuring location is at 9800 feet in the Upper Green; however, the basin extends to elevations up to 13,000 feet. Nearly half of the basin is not represented by the SNOTEL network. It is possible there is still small amounts of remaining snow at the highest elevations.
--- Upper Green basin snow water equivalent plot.

Streamflow:
May streamflow was near 70 percent of average.

Soil Moisture:
Modeled soil moisture states indicated near average to above average soil moisture conditions last fall prior to snow accumulation.

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 Green basin.

Forecast Summary:
The Upper Green had above average and much above average precipitation in October, November, January, and February. However, warm and dry conditions persisted from March through May resulting in decreased snow accumulation and early snowmelt. As a result of the warm and dry spring, the seasonal runoff forecasts have been continually reduced since March. Current April through July streamflow volume forecasts in the Upper Green have decreased by 5 to 15 percent since May. Forecasts for locations on the North Slope of the Uintas are in the bottom three of the historical record. April through July forecasts now range between 47 and 83 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 60 percent of average in the Yampa/White basin. May precipitation was near 25 percent of average. May was the third month in a row with much below average precipitation.

Snow:
The snow had melted out of nearly all the SNOTEL measuring locations by June 1st. Many of these locations had record or near record early melt out dates.
--- Yampa basin snow water equivalent plot.

Streamflow:
May streamflow was 40 percent of average over the basin as a whole.

Soil Moisture:
Modeled soil moisture states indicated above average to much above average soil moisture conditions last fall prior to snow accumulation.

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

Forecast Summary:
Near average precipitation in October and November was followed by multiple months, with the exception of February, of much below average precipitation and above normal temperatures. These conditions lead to decreased snow accumulation and record early snowmelt in the Yampa River Basin. As a result of the unseasonably warm and dry spring, seasonal runoff forecasts have continually decreased since March. Current April through July streamflow volume forecasts in the Yampa have decreased by 10 to 20 percent since May. Many of the April through July forecasts are in the bottom five of the historical record. April through July forecasts now range between 25 and 53 percent of average with a median value of 38 percent.

The following conditions influenced this month's forecasts:

Precipitation:
Seasonal October through May precipitation was 70 percent of average in the Duchesne basin. May precipitation was 15 percent of average. May was the third month in a row with much below average precipitation.

Snow:
The snow had melted out of nearly all the SNOTEL measuring locations by June 1st. Many of these locations had record or near record early melt out dates.
--- Duchesne basin snow water equivalent plot.

Streamflow:
May streamflow was near 70 percent of average over the basin as a whole. However, some low elevation locations had monthly volumes less than 50 percent of average.

Soil Moisture:
Modeled soil moisture states indicated much above average soil moisture conditions last fall prior to snow accumulation.

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

Forecast Summary:
A wet October was followed by multiple months of below to much below average precipitation in the Duchesne basin. Warm and dry conditions persisted from March through May resulting in decreased snow accumulation and early snowmelt. As a result of the unseasonably warm and dry spring, seasonal runoff forecasts have continually decreased since March. Current April through July streamflow volume forecasts in the Duchesne have again decreased by 10 to 20 percent April through July forecasts now range between 11 and 56 percent of average with a median value of 44 percent.

The following conditions influenced this month's forecasts:

Precipitation:
Seasonal October through May precipitation was 70 percent of average in the Lower Green basin. May precipitation was 10 percent of average. May was the third month in a row with much below average precipitation.

Snow:
The SNOTEL locations have been melted out since late April in the Lower Green. All of the snow in the Lower Green has melted. Many of these locations had record or near record early melt out dates.
--- Lower Green basin snow water equivalent plot.

Streamflow:
May streamflow was near 45 percent of average over the basin as a whole.

Soil Moisture:
Modeled soil moisture states indicated near average to above average soil moisture conditions last fall prior to snow accumulation.

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

Forecast Summary:
A wet October was followed by multiple months of below to much below average precipitation,with the exception of February, in the Lower Green. Warm and dry conditions persisted from March through May resulting in decreased snow accumulation and early snowmelt. As a result of the unseasonably warm and dry spring, seasonal runoff forecasts have continually decreased since March. Current April through July streamflow volume forecasts in the Lower Green have again decreased by 10 to 15 percent. Many of the forecasts in the Lower Green are in the bottom five of the historical record. April through July forecasts now range between 15 and 43 percent of average with a median value of 36 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).