Extended Streamflow Guidance
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311
FGUS65 KSTR 132319
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

                       FEBRUARY 13, 2018


The 2018 spring runoff flood potential due to snowmelt is
not high at this time in the Upper Green River and Bear River
Basins of southwest Wyoming due average and below
average snowpack. However, it is still early in
the snow accumulation season in southwest Wyoming and
conditions can change before runoff begins.

Month to date precipitation for the month of February so far has
been above average in parts of the Upper Green River above Fontenelle
reservoir and below to much below average for other areas in
southwest Wyoming. Precipitation as February 1st and current
snow conditions are listed below.

PRECIPITATION AND SNOWPACK (% OF AVERAGE):

SUBBASIN                    JAN      OCT-JAN     FEB 13
                          PRECIP     PRECIP      SNOW
----------------------    ------     -------     -----
GREEN ABV FLAMING GORGE      85         90        105
BEAR RIVER HEADWATERS        75         80         70


The current volume forecasts for the April through July runoff period
are near average in the Upper Green River and below average in the
Bear River Basin. Although spring temperatures affect the pattern of snowmelt
runoff and consequently the magnitude of peak flows, peak flows may
roughly correspond to volumetric flows.

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.

The spring runoff flood potential will be re-evaluated in early March
and an updated product will be issued at that time.

CBRFC/Nielson

$$








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