Update on Seasonal Conditions & Summer Weather Outlook
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1 Update on Seasonal Conditions & Summer Weather Outlook Andy Bryant National Weather Service Portland, Oregon June 6, 2018
2 Overview Quick review of winter and spring conditions Seasonal water supply forecasts for a few area rivers Summer outlook
3 Winter/Spring Review These are some monthly highlights for the Columbia Basin during this water year. For more details, visit
4 Seasonal Snowpack Kootenay Park, B.C. Glacier Nat l Park Mt Hood - Timberline Crater Lake Nat l Park Snowpack in the Columbia Basin was generally above-average in northern Washington, northern Idaho, western Montana, NW Wyoming, and British Columbia. Snowpack was below-average in most of Oregon and southwest Idaho. SNOTEL graphics from
5 Drought Monitor
6 Seasonal Water Supply Forecasts Willamette R at Salem This chart shows the evolution of the daily Ensemble Streamflow Prediction for the April-September runoff volume, starting at the beginning of the water year through the current date. The blue dot is the mean of each daily ensemble run. The text box shows the forecast for the April September and other periods. More details at
7 Seasonal Water Supply Forecasts Clackamas R at Estacada This chart shows the evolution of the daily Ensemble Streamflow Prediction for the April-September runoff volume, starting at the beginning of the water year through the current date. The blue dot is the mean of each daily ensemble run. The text box shows the forecast for the April September and other periods. More details at
8 Seasonal Water Supply Forecasts Sandy R near Bull Run This chart shows the evolution of the daily Ensemble Streamflow Prediction for the April-September runoff volume, starting at the beginning of the water year through the current date. The blue dot is the mean of each daily ensemble run. The text box shows the forecast for the April September and other periods. More details at
9 Seasonal Water Supply Forecasts Tualatin R at Farmington This chart shows the evolution of the daily Ensemble Streamflow Prediction for the April-September runoff volume, starting at the beginning of the water year through the current date. The blue dot is the mean of each daily ensemble run. The text box shows the forecast for the April September and other periods. More details at
10 June-July-August Temperatures: Long-Term Trend This chart shows the 3-month average for the daily average temperature averaged for multiple climate stations in the Willamette Valley, plotted for years
11 June-July-August Temperatures: Past 30 Years This chart shows the 3-month average for the daily average temperature averaged for multiple climate stations in the Willamette Valley, plotted for years
12 June-July-August Max Temperatures: Long-Term Trend This chart shows the 3-month average for the daily maximum temperature averaged for multiple climate stations in the Willamette Valley, plotted for years
13 June-July-August Max Temperatures: Past 30 Years This chart shows the 3-month average for the daily maximum temperature averaged for multiple climate stations in the Willamette Valley, plotted for years
14 Area River Temperatures This chart shows graphs of river temperature for multiple creeks and rivers in the Portland area, along with the average of all the rivers.
15 Summer Outlook: This Week This will be the first significant rainfall in NW Oregon since mid-april. Rain will begin Friday afternoon and continue through much of Saturday, with showers Sunday. Amounts will generally be a half-inch to an inch.
16 Summer Outlook: Next Week Visit for the latest 8-14 day, monthly, and seasonal outlooks.
17 Summer Outlook: June - August Visit for the latest 8-14 day, monthly, and seasonal outlooks.
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