Extended Streamflow Guidance
Issued by NWS

Home | Current Version | Previous Version | Text Only | Print | Product List | Glossary On
Versions: 1 2
079
FGUS65 KSTR 051700
ESGWY
COLORADO BASIN RIVER FORECAST CENTER
NATIONAL WEATHER SERVICE SALT LAKE CITY UTAH


                     SPRING FLOOD POTENTIAL
          FOR THE GREEN AND BEAR RIVER BASINS IN WYOMING

                   May 5, 2016

The 2016 spring runoff flood potential due to snowmelt is
is not high this at time for the Upper Green and Bear River
basins.

There are currently no sites forecast to peak at or above
bankfull or flood flow.

Below average peak flows are expected for southwest
Wyoming based on the current snow conditions. However, it is
important to note that specific forecast procedures and flood
flow levels do not exist for every stream.

April precipitation was mix of above and below average for southwest
Wyoming. The north slope of the Uintas,and the area between Fontenelle
and Flaming Gorge reservoirs had much above average precipitation. Areas
above Fontenelle reservoir had below or near average precipitation.  As
of May 1st, water yearprecipitation is near average in both the Upper
Green above Flaming Gorge and Bear River basins.

April 1st snow water equivalent for the Upper Green above Flaming Gorge
is 95% of median and 85% of median in the headwaters of the Bear River.
It is important to note that the variation in daily snow measurements
either due to melt or new snow from spring storms may cause the reading
to drop below or rise above the historical median for the day.

Although spring temperatures affect the pattern of snowmelt runoff and
consequently the magnitude of peak flows, peak flows also roughly correspond
to volumetric flows. The current volume forecasts for the April through
July runoff period are below average in all basins located in southwest
Wyoming.

It is also important to keep in mind that an extended period of
much above normal temperatures or heavy rainfall during the melt
period can cause or exacerbate flooding problems in any
year, regardless of snowpack conditions.

The spring runoff flood potential will be re-evaluated in mid April and an updated
product will be issued at that time

A list of specific spring peak flow forecasts are available at:
http://www.cbrfc.noaa.gov/rmap/peak/peaklist.php

A map of the current spring peak flow forecasts is available at:
http://www.cbrfc.noaa.gov/lmap/lmap.php?interface=peak

CBRFC/A.Nielson,P.Miller

$$








USA.gov is the U.S. government's official web portal to all federal, state and local government web resources and services.