Extended Streamflow Guidance
Issued by NWS

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000
FGUS65 KSTR 041902
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

                      APRIL 4, 2019

The 2019 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. However, it should be emphasized that
snow typically accumulates into April and May in the Upper Green
and Bear River basins. The threat of spring flooding will largely be
determined by hydrometeorologic events that occur during the next two months.
into April, therefore conditions may change before the runoff begins.

Current model guidance is forecasting below average to average
peak flows and is not indicating any locations to hit flood flow.
However,specific forecast procedures and flood flow levels do not exist
for all streams.

March precipitation was near average for areas in southwest
Wyoming. Water year precipitation (October-March) is also
currently near average. Precipitation and snow conditions as of
April 1st are listed below.

PRECIPITATION AND SNOWPACK (% OF AVERAGE):

SUBBASIN                     MAR    OCT-MAR     APR 1
                          PRECIP     PRECIP      SNOW
----------------------    ------     -------     -----
GREEN ABV FLAMING GORGE      90        100        100
BEAR RIVER HEADWATERS       110        110        105


Although spring temperatures affect the pattern of snowmelt runoff
and consequently the magnitude of peak flows, peak flows may roughly
correspond to volumetric flows. Current volume forecasts for the
April through July runoff period in southwest Wyoming are below to near
average.

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 May
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

$$

C






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