Hydrologic Outlook
Issued by NWS Portland, OR
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000 FGUS76 KPQR 062100 ESFPQR Water Supply Outlook National Weather Service Portland OR 200 PM PDT Tuesday June 6 2017 ...OREGON WATER SUPPLY OUTLOOK AS OF JUNE 6TH 2017... The water supply forecast for the summer of 2017 is above-average statewide. April through September runoff-volume forecasts range from 100 to 170 percent of average, with above-average forecasts for most rivers basins in Oregon, except near-average forecasts for a few basins in coastal western Oregon and northeast Oregon. Snowpack as of June 5th is limited to elevations above 5500 feet in the Cascades and 7000 feet in eastern Oregon mountains, with minimal area of snow coverage remaining. This year`s above-average seasonal snowpack peaked in March and April. The June 2017 outlook by the Climate Prediction Center calls for enhanced possibility of below-average precipitation in western Oregon, with equal chances of near, above, or below-average precipitation for central and eastern Oregon. The temperature outlook for June and through the summer calls for an enhanced possibility of above-average temperatures for Oregon. For more details, visit www.cpc.ncep.noaa.gov. Refer to the sections below and links provided for details regarding snowpack, precipitation, reservoir conditions, and water supply forecasts for individual basins. This is the final water supply outlook for the season. The next outlook is scheduled to be issued February 2018. ============================================================ Snowpack across Oregon Some snow remains above 5500 feet in the Cascades and above 7000 feet in eastern Oregon mountains. Seasonal snowpack peaked at 120 to 150 percent of average in March and April. Additional snowpack information: NOAA National Weather Service - Northwest River Forecast Center www.nwrfc.noaa.gov/snow/ USDA Natural Resources Conservation Service www.nrcs.usda.gov/wps/portal/nrcs/main/or/snow/ ============================================================ Precipitation and Temperatures across Oregon Precipitation for the 2017 water year thus far (Oct 1, 2016 through May 31, 2017) ranges from 120 to 150 percent of average in Oregon, but May precipitation was below-average, especially so in central and eastern Oregon. May temperatures were 1 to 3 degrees above- average across the state. Details on precipitation and temperatures: NOAA National Weather Service - Northwest River Forecast Center www.nwrfc.noaa.gov/water_supply/wy_summary/wy_summary.php NOAA NWS - California-Nevada River Forecast Center (Klamath basin) www.cnrfc.noaa.gov/water_resources_update.php ============================================================ Reservoirs Reservoir storage increased somewhat in May, adding to the major increases through the spring. As of early June, most irrigation reservoirs around the state are 95 to 100 percent full. Note that Owyhee Reservoir, Oregon`s largest irrigation reservoir, filled to 100 percent of capacity in late April and remains full as of early June. Reservoir data is provided by the Natural Resources Conservation Service, the Bureau of Reclamation, and the US Army Corps of Engineers. Additional reservoir information: www.wcc.nrcs.usda.gov/basin.html www.usbr.gov/pn/hydromet/select.html www.nwd-wc.usace.army.mil/nwp/teacup/willamette/ ============================================================ Observed Streamflow Observed streamflow in May 2017 was above-average for nearly all Oregon rivers and especially high for rivers draining the Cascades. Visit waterwatch.usgs.gov for details on observed streamflow. Water year and monthly runoff data is available at www.nwrfc.noaa.gov for several locations in Oregon. ============================================================ Forecast Streamflow and Seasonal Runoff Volumes Forecasts for April-September runoff volume range from 100 to 170 percent of average, with the highest values generally in southwestern and eastern Oregon and the lowest values in northwest Oregon. Seasonal forecasts have trended upward through the spring. The June 5th forecast for the Columbia River at The Dalles, which is a good index of conditions across the Columbia Basin, is 132 percent of average for April-September, an increase of 3 percent from the forecast on May 4th. Details on basin-scale water supply forecasts: NOAA National Weather Service - Northwest River Forecast Center www.nwrfc.noaa.gov/ws/ USDA Natural Resources Conservation Service www.wcc.nrcs.usda.gov/wsf/ Bryant $$

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Portland, OR 97230-1089
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Page last modified: 6-Jun-2017 9:00 PM
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