Extended Streamflow Guidance
Issued by NWS

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FGUS65 KSTR 051648
ESGCO

NATIONAL WEATHER SERVICE
COLORADO BASIN RIVER FORECAST CENTER
SALT LAKE CITY, UT


                      SPRING FLOOD POTENTIAL
             FOR THE COLORADO RIVER BASIN WITHIN COLORADO

                         JANUARY 5, 2018


The 2018 spring runoff flood potential due to snowmelt is not high at this time
for the Yampa/White, Upper Colorado mainstem, Gunnison, Dolores and San Juan
basins.  It should be emphasized that it is very early in the snow accumulation
season and conditions could change quite a bit before the runoff begins.

December precipitation was below to much below average in all basins across
western Colorado with values between 20 and 65 percent of average; lowest values
occurred in the southern basins and highest in the northern basins.  Seasonal
precipitation is below average in all basins.  January 1st snow water equivialent
is between 25 and 70 percent of average and follows the same pattern as the
December precipitation.

The current volume forecasts for the April through July runoff period are
below to much below average in all basins.

Although spring temperatures affect the pattern of snowmelt runoff and
consequently the magnitude of peak flows, peak flows also 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.



CBRFC/Moser




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