Extended Streamflow Guidance
Issued by NWS
FGUS65 KSTR 061646
National Weather Service
Colorado Basin River Forecast Center
Salt Lake City, Utah
May 4, 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 60%
Sevier River Basin 50%
Price/San Rafael River Basin 10%
Duchesne River Basin 30%
--Bear River Basin 20%
--Weber River Basin 20%
--Six Creeks Basin 15%
--Utah Lake 25%
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 the state. In particular, volume forecasts in the southern
portion of the state and Great Basin are well below average.
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