Water Supply Outlook National Weather Service Portland OR 435
21 juin 2022 Precipitation so far this water year (October 1 2021 to present) is below average for most of Oregon
Seasonal Climate Forecast: October-December 2022
16 sept. 2022 Precipitation forecast is less certain. 1956 was wet but 1971 & 2008 were drier than average. Their “blend” yields near-average rainfall.
Precipitation Intensity Trend Detection using Hourly and Daily
18 févr. 2017 and hourly records from 24 rain gages in Portland Oregon (OR)
Appendix A. Stormwater Design Methodologies
13 juil. 1998 City of Portland Stormwater Management Manual—Month Year. A-1 ... corresponding to 90% of the average annual rainfall can be determined by ...
Precipitation Intensity Trend Detection using Hourly and Daily
18 févr. 2017 The hourly data were used to calculate intensity as a ratio of the monthly totals in rainfall volume. (mm) to hours of rainfall (h). Portland ...
Ecoroof Stormwater Monitoring
Average annual rainfall in Portland Oregon is 37 inches
Annual CSO and CMOM Report - FY 2020
Portland's integrated combined sewer overflow (CSO) system and the FY 2020 was a below average rainfall year for the City of Portland. The area-.
2013 Stormwater Management Facility Monitoring Report
Bureau of Environmental Services • City of Portland. 2013. Stormwater Figure HA-4: Monthly rainfall and associated runoff retention.
Modelling Rainwater-Harvesting System Reliability Based on
Based on Historical Precipitation Data for Portland. Mrinali Mathur Box and Whisker plot depicting variability in monthly precipitation in Portland.
NGBS Green Interpretation - 2020 NGBS Appendix D WRI (2 of 2)
20 sept. 2021 the full monthly rainfall value as EffectiveRainfall. ... The Portland reference homes were impacted a bit more with the application.
Days per Month Year and Water Year with Rainfall of
1 N (normal) is the climate normal (1991-2020) for Portland Airport Due to rounding of the monthly values the year total may not equal the sum of the monthly values 2 WY is Water Year which is includes rainy season is defined as the period from 1 October through 30 September
Seasonal Climate Forecast: May-July 2023 - Oregongov
given to this month’s analog years (1972 2001 & 2012) nWhile highly anomalous weather may continue through May and June things should “settle down” by July nHigher elevations will take longer to warm because of the well-above-average snowpack That snow-melt should further improve the drought
How many days a year does it rain in Portland Oregon?
PORTLAND 726980 45 58N 122 58W 12 101 18 -8 00 NAP 7201 Annual Heating and Humidification Design Conditions 99 6 99 DP HR MCDB DP HR MCDB WS MCDB WS MCDB MCWS PCWD 2 3a3b4a4b 4c 4d4e 4f 5a5b 5c 5d6a6b 1 -5 6 -2 8 -13 8 1 1 -4 1 -10 0 1 6 -0 4 13 9 0 3 12 5 2 0 6 0 120 Annual Cooling Dehumidification and Enthalpy Design Conditions
State of Oregon Department of Environmental Quality Guidelines
These guidelines describe a rainfall method for calculating current or prevailing sewage flowrates It is a shortcut method for using published rainfall statistics to determine peak monthly and daily flows which have specific recurrence intervals or probabilities of occurrence
State of Oregon Department of Environmental Quality Clean
Portland Stormwater Management Manual The Portland Stormwater Manual uses the 10-year 24-hour storm as the design storm for managing runoff volume recognizing that few sites will be able to retain this volume of stormwater without discharge The water quality treatment standard is a volume treatment goal of 90 percent of the average annual
How many days does it rain in Portland?
- Portland is, after all, a rainforest. The South can get 60 to 70 inches of rain a year. Again, we’re at 42, but they only get maybe 60 days of rain, where we get 130. That’s the difference. 130 days of rain sounds like a lot, but that’s only a little over a third of the year.
What is the average monthly weather in Portland Oregon?
- The coldest month in Portland is December, when the average daily low is 35 °F (2 °C) and the daily high is 46 °F (8 °C) . January and February are very similar, averaging 36–47 °F (2–8 °C) and 36–51 °F (2–11 °C) respectively.
What is the weather like in Portland?
- The Pacific Northwest is known for warm, dry summers and cool, wet winters—and Portland is no exception. Compared to Seattle and Vancouver, Portland is both warmer and drier all year round.
What is the annual snowfall for Portland?
- The rainiest season is Spring when it rains 34% of the time and the driest is Autumn with only a 11% chance of a rainy day. An annual snowfall of 2.6 inches in Portland means that it is less snowy than most places in Oregon. December is the snowiest month in Portland with 0.9 inches of snow, and 3 months of the year have significant snowfall.
Water Supply Outlook
National Weather Service Portland OR
400 PM PST Tuesday June 6 2023
Online version posted Thursday June 8, 2023
...OREGON WATER SUPPLY SUMMARY AS OF JUNE 6TH 2023...The water supply forecast for the summer of 2023 is above average for almost all Oregon watersheds. Spring
precipitation resulted in major increases in streamflow and reservoir storage statewide, especially for central
and eastern Oregon, areas previously impacted by multi-year drought.Precipitation so far this water year (Oct 2022 - May 2023) is slightly below average for the Cascades, along
with most of western and north-central Oregon. Water year precipitation is above average for eastern,
central, and portions of southwest Oregon. Spring precipitation, March through May, was notably above
average for most of Oregon, helping to boost mountain snowpack and spring and summer water supply volumes.Despite recent improvements, drought impacts remain for portions of the state. Drought declarations from
the Oregon Governor`s Office are in effect for Crook, Deschutes, Grant, Harney, Jefferson, Lake, Sherman and
Wasco counties.
Refer to the sections below and links provided for details regarding precipitation, temperatures, seasonal
climate outlooks, reservoirs, streamflow, and water supply forecasts. This is the final water supply summary of the season. Updates will resume in January 2024.PRECIPITATION AND TEMPERATURES ACROSS OREGON
Precipitation for the 2023 water year thus far (Oct 2022 - May 2023) ranges from 70 to 110 percent of average
in Oregon, with most of the state being below average. However, spring precipitation, March through May,
was above average for most of the state and resulted in major increases in streamflow, reservoir storage, and
summer water supply forecasts. Temperatures through most of the winter and spring were below average.
May precipitation was above average for central and eastern Oregon and below average for western and northern Oregon. May temperatures were 1 to 3 degrees above average, with periods of hot weather in mid and late May.Details on precipitation and temperatures:
NOAA NWS - Northwest River Forecast Center
NOAA NWS - California-Nevada River Forecast Center (Klamath basin) Westwide Drought Tracker Precipitation & Temperature graphics wrcc.dri.edu/wwdt/index.php?region=orPRECIPITATION AND TEMPERATURE OUTLOOK
The Climate Prediction Center produces monthly and seasonal outlooks, in which there is a weighing of the
odds of near normal, above normal, or below normal temperatures and precipitation.The June outlook shows an enhanced likelihood of above-average temperatures, especially for the northern
half of Oregon. The outlook also shows a slightly enhanced likelihood of above-average precipitation for most
of the state, especially for eastern Oregon. The big message for the July through September outlook is an enhanced likelihood of above-averagetemperatures. Precipitation amounts during this time are typically not significant in terms of water year totals
and are likely to be a little below average. Visit www.cpc.ncep.noaa.gov for more about seasonal outlooks.RESERVOIRS
Reservoir storage increased greatly in April and May for most irrigation reservoirs across the state. Several
reservoirs that were at or near record low storage in late winter are now full or near full.Owyhee Reservoir, the largest irrigation project in the state, had observed storage on June 5th of about
571,000 acre-feet, an increase of about 60,000 acre-feet from a month ago. This represents 80 percent of
capacity and is 107 percent of average for this time of year.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.usbr.gov/pn/hydromet/select.html www.wcc.nrcs.usda.gov/basin.htmlOBSERVED STREAMFLOW
Observed runoff so far this water year has
been above average for southeast and central Oregon, near average for northeastOregon basins and western Oregon coastal
watersheds, and below average elsewhere.Runoff in May was above average for most
of the state but near-average for much of western Oregon. Several rivers in central and eastern Oregon had flooding due to rapid snowmelt along with periods of rain.Visit waterwatch.usgs.gov for details on
observed streamflow. Runoff data is also available at www.nwrfc.noaa.gov/natural/index.html at water year and monthly time scales for several locations in Oregon.WATER SUPPLY SEASONAL FORECASTS
Water supply forecasts for April-September runoff volume are above average for most Oregon watersheds,
with only a smattering of near or below average forecasts around the state. Forecasts are notably high for
central and east-central Oregon, ranging from 150 to 300 percent of average, and even higher for a few small
watersheds.The forecast for the Columbia River at The Dalles, which is a good index of conditions across the Columbia
Basin, is 90 percent of average for April-September, an decrease of 3 percent from a month ago.Details on basin-scale water supply forecasts:
NOAA NWS - Northwest River Forecast Center www.nwrfc.noaa.gov/ws/NOAA NWS - California-Nevada RFC Klamath basin)
USDA Natural Resources Conservation Service
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