# Washington | Snow Survey & Water Supply Program

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-  Washington | Snow Survey & Water Supply Program 

The NRCS Snow Survey Program provides mountain snowpack data and streamflow forecasts for the western United States.  Common applications of snow survey products include water supply management, flood control, climate modeling, recreation, and conservation planning.

## Interim Issue Resolution: Air Temperature Data Bias

The extended range air temperature sensors used at SNOTEL sites in the continental U.S. calculate temperature from sensor output voltage using a linear least-squares regression algorithm. It has been determined that use of the linear least-squares regression algorithm has resulted in a data bias. The Snow Survey and Water Supply Forecasting Program is actively working on a correction technique for this issue.

### **More Information:**

              - Air Temperature Bias Correction Metadata and Resources
              - Map based debiasing progress webpage

##   Snow Survey Data, Products, and Reports

        Snow & Precipitation    

###                     Snow & Precipitation                

### I. Today's Summary Reports, Maps & Graphs

                                  - **Daily Snow and Precipitation Update Report**
                                  - **Interactive Map**
                                  - **Report Generator data Search**
                                  - **Weekly Water and Climate Update**
                                  - **List-Based Access to SNOTEL Data**   -Contains most recent hourly data  (where available)
                                  - **Water Year Graph of Snowpack & Precipitation**  (Current water year and 30-yr average data)

### II. Monthly Data​​​​​

                                  - Water Supply Forecast Products
                                  - Basin Data Reports (Includes snow courses, SNOTEL, Precipitation, Reservoir & Forecasts)
                                  - **Monthly Reservoir Reports and Graphics**
                                  - Basin Average Map of Western US Snowpack (historic thru 2018)
                                  - Basin Average Map of Columbia Basin Snowpack    (historic thru 2018)

        Water Supply    

###                     Water Supply                

### I. Streamflow Forecasting

                                  -  **Water Supply Forecast Charting Tool  NEW** 
                                  -  **Western US Streamflow Forecast Map (50% probability)** 
                                  -  **Western US Streamflow Forecast Tables** 
                                  -  **Daily Water Supply Forecast Charts** 

### II. Reservoir Storage

                                  -  **Current Washington Reservoir Storage Report** 
                                  -  **Current Western US Reservoir Storage Graphic** 

        Climate    

###                     Climate                

### I. Additional Resources for Climate Information

                                  -  **Field Office Guide to Climate Data** 
                                  -  **Climate Analysis for Wetlands and Beyond (By individual county/station, eFOTG)** 
                                  -  **Washington Climate Anomaly Maps and Tables** 
                                  -  **Washington Climate Summaries** 
                                  -  **Long Range Weather Forecasting** 
                                  -  **United States Drought Monitor** 

        Interactive Map    

###                     Interactive Map                

                                  - Includes popup graphics for current SNOTEL and Basin conditions

##   2024 Water Supply Outlook Reports

Jan. 2024 Washington Water Supply Outlook Report (7.38 MB)

Feb. 2024 Washington Water Supply Outlook Report (8.6 MB)

March 2024 Washington Water Supply Outlook Report(7.65 MB)

April 2024 Washington Water Supply Outlook Report(8.23 MB)

May 2024 Washington Water Supply Outlook Report(11.71 MB)

June 2024 Washington Water Supply Outlook Report(7.37 MB)

##   2023 Water Supply Outlook Reports

January 2023 Washington Water Supply Outlook Report(3.47 MB)

February 2023 Washington Water Supply Outlook Report(2.86 MB)

March 2023 Washington Water Supply Outlook Report(2.51 MB)

April 2023 Washington Water Supply Outlook Report(2.63 MB)

May 2023 Washington Water Supply Outlook Report(2.7 MB)

## Additional Snow Survey Information & Quick Links

              - USDA  Drought Resources
              - Today's Snowpack & Precipitation Update Report:  Washington

##   Water Conditions at a Glance by year

2010 Washington Conditions at a Glance(234.73 KB)

2011 Washington Conditions at a Glance(251.16 KB)

2012 Washington Conditions at a Glance(246.32 KB)

2013 Washington Conditions at a Glance(263.65 KB)

2014 Washington Conditions at a Glance(269.63 KB)

2015 Washington Conditions at a Glance(252.88 KB)

2016 Washington Conditions at a Glance(243.79 KB)

2017 Washington Conditions at a Glance(266.29 KB)

2018 Washington Conditions at a Glance(259.31 KB)

2019 Washington Conditions at a Glance(301.35 KB)

2020 Washington Conditions at a Glance(225.33 KB)

2021 Washington Conditions at a Glance(241.61 KB)

2022 Washington Conditions at a Glance(270.7 KB)

##   Washington Water Supply Outlook Reports by year

If you wish to receive an email notification when the report is available or if you require reports previous to 2010 please contact Scott Pattee (scott.pattee@wa.usda.gov).

2010 Washington Water Supply Outlook.pdf(2.81 MB)

2011 Washington Water Supply Outlook.pdf(2.44 MB)

2012 Washington Water Supply Outlook.pdf(2.35 MB)

2013 Washington Water Supply Outlook.pdf(7.37 MB)

2014 Washington Water Supply Outlook.pdf(3.81 MB)

2015 Washington Water Supply Outlook.pdf(5.6 MB)

2016 Washington Water Supply Outlook.pdf(5.79 MB)

2017 Washington Water Supply Outlook.pdf(4.92 MB)

2018 Washington Water Supply Outlook.pdf(6.97 MB)

2019 Washington Water Supply Outlook.pdf(10.29 MB)

2020 Washington Water Supply Outlook.pdf(10.47 MB)

2021 Washington Water Supply Outlook.pdf(8.92 MB)

2022 Washington Water Supply Outlook.pdf(13 MB)