Flood Potential Outlook
Issued by NWS Denver/Boulder, CO

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FGUS75 KBOU 102347

Water Supply Outlook
National Weather Service Denver/Boulder CO
546 PM MDT Fri May 10 2019

...Water Supply Outlook for north central and northeast Colorado as
of May 2019...

From the NRCS Colorado Water Supply Report: "After the plentiful
precipitation experienced during March, sunshine and dry skies
prevailed over Colorado`s mountains during much of April...mountain
snowpack transitioned to spring-like conditions during April.
Increasing sunshine and warm temperatures took hold the latter half
of the month, leading to the onset of snowmelt in most locations.
Colorado`s mountains lost several inches of snow water equivalent
before a cold storm at the end of April delivered considerable new
snowfall across the state...In most of the state`s major river
basins, the bulk of April`s moisture fell during the last four days
of the month."

At the beginning of May, the north central Colorado mountain snow
water equivalent had fallen to 118% of normal in the upper Colorado
River basin west of the Continental Divide, and 108% of normal in
the South Platte and North Platte basins east of the divide.
Snowfall increased at the end of April and early May boosting the
snowpack to 143% of normal in the upper Colorado River basin, 120%
of normal in the South Platte, and 109% of normal in the North
Platte basin by May 10th.

Combined reservoir storage was 103 percent of average in the South
Platte basin and 93 percent of average in the upper Colorado River
basin on May 1st. Most U.S. Geological Survey stream gages (with
long historical records) had near to much above normal flows in
early May. National Weather Service streamflow volume forecasts are
near to below average east of the divide, and near to above average
west of the divide.

                                       Median Forecast
                                      Volume      Percent
Stream and Station         Period     1000 AF      of Avg
__________________         ______     _______     _______
South Platte River
 Antero Reservoir inflow   May-Sep      10          69
 Spinney Mtn Res inflow    May-Sep      40          84
 11-Mile Canyon Res inflow May-Sep      44          87
 Cheesman Lake inflow      May-Sep      76          79
 South Platte              May-Sep     153          91

Bear Creek
 Morrison                  May-Sep      14          84

Clear Creek
 Golden                    May-Sep      91          79

Saint Vrain Creek
 Lyons                     May-Sep      65          74

Boulder Creek
 Orodell                   May-Sep      38          83

South Boulder Creek
 Eldorado Springs          May-Sep      18          50

Cache La Poudre River
 Canyon Mouth              May-Sep     212         112

North Platte River
 Northgate                 May-Sep     278          98

Colorado River
 Granby                    May-Jul     230         112

Willow Creek
 Willow Creek Res          May-Jul      61         142

Fraser River
 Winter Park               May-Jul      18.5        99

Williams Fork River
 Williams Fork Reservoir   May-Jul      92         102

Blue River
 Dillon Res                May-Jul     192         125
 Green Mtn Res             May-Jul     300         118

Muddy Creek
 Wolford Mtn Res Blw       May-Jul      53         115

Colorado River
 Kremmling                 May-Jul     900         115

These forecasts reflect natural flow only. Actual observed flow will
likely be affected by upstream water management.

Additional supportive information
- Visit the Missouri Basin RFC information webpage for water supply
forecasts east of the divide at weather.gov/mbrfc/water.
- Visit the Colorado Basin RFC for water supply forecasts west of
the divide at cbrfc.noaa.gov/lmap/lmap.php?interface=wsup.
- Visit our website at weather.gov/bou for additional local
weather...climate and stream information.
- Long range precipitation and temperature outlooks are available at
- Snowpack and reservoir data are available from the Natural
Resources Conservation Service at www.wcc.nrcs.usda.gov/snow/.


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