Extended Streamflow Guidance
Issued by NWS

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FGUS65 KSTR 091331

National Weather Service
Colorado Basin River Forecast Center
Salt Lake City, Utah
April 5, 2018

                       FLOOD POTENTIAL OUTLOOK

Great Salt Lake, Sevier, Virgin, Price/San Rafael and Duchesne
River Basins.

The 2018 spring runoff flood potential due to snowmelt remains lower than normal
for this time of year. Near record, to record low snowpack conditions exist
as of April throughout most of Utah except in the Bear River basin.

Snowpacks in Utah range from 55 to 80 percent of median. Almost all of the
SNOTEL sites rank in the lowest 3 to 6 years on recorded with the remainder of
SNOTEL sites, except in the Bear Basin and Cottonwood Canyons, in the lowest
10th percentile for the POR.

Snowmelt peak flow forecasts this spring are expected to be below average at
this time. April-July streamflow volumes are also likely to be much below
average with recent forecasts average ranging between 35 and 45 percent
except in portions of the Bear headwaters where the median is 70 percent of

While flood related problems are not anticipated at this time due soley to
snowmelt, heavy rainfall can cause flood related issues in any year,
especially during spring runoff.

Further assessment will be made regarding any snow melt flood threat as
the season progresses.

CBRFC/B.Bernard, A.Nielson, Z.Finch, P.Kormos


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