Precipitation (mm)
4 layers: Precipitation (mm), Precipitation (mm) GCM Ensemble 2010-2040, Precipitation (mm) GCM Ensemble 2040-2070, Precipitation (mm) GCM Ensemble 2070-2100
Layers
| Layer | Period | Units | Earth Engine | Download | Catalog |
|---|---|---|---|---|---|
| Precipitation (mm) | released 2026-11-02 | mm/year | Precipitation_mm | 79 KB | item |
| Precipitation (mm) GCM Ensemble 2010-2040 | 2010 to 2039 | mm/year | Climate_Ensemble_2010-2040_Precipitation_mm | 79 KB | item |
| Precipitation (mm) GCM Ensemble 2040-2070 | 2040 to 2069 | mm/year | Climate_Ensemble_2040-2070_Precipitation_mm | 79 KB | item |
| Precipitation (mm) GCM Ensemble 2070-2100 | 2070 to 2099 | mm/year | Climate_Ensemble_2070-2100_Precipitation_mm | 79 KB | item |
Description
Precipitation (mm)
Mean annual precipitation for the 1981–2020 historical period, derived from the University of Washington Climate Impacts Group (CIG) bias-corrected WRF-NARR historical dataset (Mauger and Won 2024).
The WRF-NARR dataset dynamically downscales the NCEP North American Regional Reanalysis (NARR) with the Weather Research and Forecasting (WRF) mesoscale model. CIG provided hourly precipitation on a 6 km grid across the Puget Sound region and bias-corrected the dataset with the percentile-delta method against PRISM daily precipitation; Mauger and Won (2024) document the method, the evaluation of model skill, and the choice of PRISM as the observational reference.
Mean annual precipitation was calculated for each grid cell over the 1981–2020 period. This layer is the historical reference for the GCM ensemble precipitation layers.
Precipitation (mm) GCM Ensemble 2010-2040
Mean annual precipitation for the 2010–2040 climate normal period, derived from the University of Washington Climate Impacts Group (CIG) bias-corrected ensemble of WRF-CMIP5 climate projections (Mauger and Won 2024).
Mean annual precipitation was calculated for each grid cell over the 2010–2040 period. The period includes 2010 and runs through 2039; the end year is exclusive. Compare with the historical (1981–2020) precipitation layer to see the projected change.
Precipitation (mm) GCM Ensemble 2040-2070
Mean annual precipitation for the 2040–2070 climate normal period, derived from the University of Washington Climate Impacts Group (CIG) bias-corrected ensemble of WRF-CMIP5 climate projections (Mauger and Won 2024).
Mean annual precipitation was calculated for each grid cell over the 2040–2070 period. The period includes 2040 and runs through 2069; the end year is exclusive. Compare with the historical (1981–2020) precipitation layer to see the projected change.
Precipitation (mm) GCM Ensemble 2070-2100
Mean annual precipitation for the 2070–2100 climate normal period, derived from the University of Washington Climate Impacts Group (CIG) bias-corrected ensemble of WRF-CMIP5 climate projections (Mauger and Won 2024).
Mean annual precipitation was calculated for each grid cell over the 2070–2100 period. The period includes 2070 and runs through 2099; the end year is exclusive. Compare with the historical (1981–2020) precipitation layer to see the projected change.
How the GCM ensemble layers were made
The projections dynamically downscale CMIP5 global climate models (GCMs) with the Weather Research and Forecasting (WRF) mesoscale model under the RCP 8.5 emissions scenario. The Heatmap uses 11 of these projections; each gives hourly precipitation for 1970–2099. CIG bias-corrected each projection with the percentile-delta method against PRISM daily precipitation and provided it on the same 6 km grid as the historical WRF-NARR dataset (the WRF projections ran at 12 km). The method keeps the relative changes simulated by each model and anchors the corrected distribution to the observed PRISM climatology.
The ensemble value is the mean of the annual precipitation totals across the 11 ensemble members.
Layer Access in Earth Engine
The JavaScript below loads this layer in the Earth Engine Code Editor. An Earth Engine account is required. The "open" links above show each asset's details in the Code Editor.
This page covers 4 layers: "Precipitation (mm)", "Precipitation (mm) GCM Ensemble 2010-2040", "Precipitation (mm) GCM Ensemble 2040-2070", "Precipitation (mm) GCM Ensemble 2070-2100".
// Import the layer data dictionary
var data = require('users/stormwaterheatmap/apps:data/public')
// To view data dictionary, print to the console:
print('Data:', data)
// Get this layer from the layer data dictionary:
var layer_name = data.rasters["Precipitation (mm)"]
// Add the styled layer to the map:
Map.addLayer(layer_name.layer)
// Raw image for analysis:
var raw_image = layer_name.layer.eeObject
Map.addLayer(raw_image, {}, 'Precipitation (mm)')
Visualization
Colormap rain, from 500 to 3800 mm/year.