Extended Streamflow Guidance
Issued by NWS
FGUS65 KSTR 031919
National Weather Service
Colorado Basin River Forecast Center
Salt Lake City, Utah
April 3, 2015
FLOOD POTENTIAL OUTLOOK
The 2015 spring runoff flood potential due to snowmelt is not high at this time
for the Great Basin, as well as the Sevier, Virgin, Price/San Rafael, and the
Duchesne River Basins.
Current snowpack conditions in the below basins are below average. Current
seasonal snowpack conditions as a percent of median are:
Virgin River Basin 35%
Sevier River Basin 45%
Price/San Rafael River Basin 40%
Duchesne River Basin 40%
--Bear River Basin 45%
--Weber River Basin 40%
--Six Creeks Basin 35%
--Utah Lake 30%
No sites are currently forecasted to reach flood or bankfull stage at this time.
Specific forecast procedures and flood flow levels do not exist for all streams.
Given current snowpack conditions, below average peaks may be anticipated
throughout the state
Current volume forecasts for the April through July runoff period are below
average for much of the state. In particular, volume forecastsin the southern
portion of the state and Great Basin are well below average.
It should be emphasized that snow conditions could change significantly before
seasonal runoff begins. While spring temperatures affect the pattern of
snowmelt runoff and, consequently, the magnitude of peak flows, peak flows also
approximately correspond to volumetric flows. It is also important to recognize
that an extended period of much above average temperaturesor heavy rainfall
during the melt period can cause or exacerbate flooding problems in any year.
A list of specific spring peak flow forecasts are available at:
A map of the current spring peak flow forecasts is available at:
CBRFC/W.P. Miller, A.Nielson, T. Cox