Extended Streamflow Guidance
Issued by NWS

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000
FGUS65 KSTR 052122
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, 2020

The 2020 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.
The snowpack is near normal and near to below average peaks are expected
in the Upper Green River and Bear River basins.

Currently, the following sites are forecast to have mean daily peak flows
at or above the listed threshold at the given exceedance level:

  Segment                     Threshold   Exceedance Value
                                          (probability)
  -------                     --------    -------------
  Bear near UT/WY Stateline   Bankfull        10
  Bear at Evanston            Bankfull        10
  Green near La Barge         Bankfull        25


Precipitation and snow conditions as of May 1st are listed below.

  PRECIPITATION(% OF AVERAGE) AND SNOWPACK (% OF MEDIAN):

    SUBBASIN                    APR      OCT-APR     MAY 1
                              PRECIP     PRECIP      SNOW
    ----------------------    ------     -------     -----
    GREEN ABV FLAMING GORGE      80         90        100
    BEAR RIVER HEADWATERS        65         90         90

It is 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.

A list of specific spring peak flow forecasts is 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

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

CBRFC/Nielson






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