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There are several interactive layers on this page:
Hydrographs: This layer (circles) includes the most current observations of California hydrographs that can be clicked to view the most recent and/or forecast data. These colored circles are shaded based on the current stage height provided by the River Forecast Center and update when new data are provided.
GPS IWV: This layer (rectangles) includes current observations of the GPS-derived integrated water vapor (IWV) at different locations (rectangles with number in centimeters inside). Clicking on these rectangles will open a four-day time series of the IWV. The data are provided by UCAR and plotted/analyzed by CW3E. The data are updated each hour for available sites. Not all site data are available each hour.
Snow Depth: This layer (rectangles) includes current daily observations of the snow depth at different locations (rectangles with number in inches inside). Clicking on these rectangles will open a link to view more data at NOHRSC. The data are provided by the NOAA/NWS CNRFC and NOHRSC. The data are updated each day at 12:00 PT.
Snow-Level Radar: This layer (triangles) includes a link to the most recent snow-level radar plots provided by the NOAA Earth Systems Research Laboratory. The two images are loaded include a time-height anlaysis of doppler vertical velocity and a time-height analysis of reflectivity. Each plot shows color shading of vertical radial velocity and circles depicting the freezing level indicated by a radar bright band when bright band precipitation is present. Each plot shows the previous 48 hours of data with time moving from left to right. Data are updated each hour and are provided by NOAA ESRL.
Disdrometer: This layer (plus signs) includes a link to a comparison between S-band radar at multiple sites as well as disdrometer and tipping bucket rain gauge data. Data shown for the previous 24 hours with time moving from left to right. Data are updated each hour and provided by NOAA ESRL/CW3E. The locations of these markers are shifted 0.05 degrees longitude west to minimize overlap with SLR markers
Microrain Radars: This description of this layer will be updated soon.
Soil Moisture: This layer (orange rhombus/diamonds) includes a link to surface meteorological data time series provided by NOAA ESRL that is currently just for the Russian River watershed. Data are updated each hour. The locations of these markers are shifted 0.05 degrees longitude east to minimize overlap with other markers
ARO Flux Obs: This layer (stars) includes a link to the most recent analysis of water vapor flux from "Atmospheric River Observatories" as provided by the NOAA Earth Systems Research Laboratory. For more information on these plots, please visit here.
Meteorology Obs: The four bottom layers in the queue will present as text icons on the map with their respective value (e.g., temperature in deg. F) and when clicked will load time series plots of temperature, dewpoint temperature, relative humidity, and wind speed/direction provided by MesoWest from their website at http://mesowest.utah.edu. The data update each hour.
F. Martin Ralph, PhD., Director
Center For Western Weather and Water Extremes (CW3E)