------------------------------------------------------------------------ README ------------------------------------------------------------------------ Parsivel disdrometer data Center for Western Weather and Water Extremes (CW3E) Scripps Institution of Oceanography, UC San Diego Contact: Peter Yao (peyao [at] ucsd [dot] edu) Last updated: 2025-02-20 For more info on the disdrometers, please see our website: https://cw3e.ucsd.edu/cw3e_observations_disdrometers/ Data is available at: https://cw3e-datashare.ucsd.edu/CW3E_Disdrometer/ ------------------------------------------------------------------------ ACTIVE STATIONS ------------------------------------------------------------------------ The following stations are currently telemetered and running in real time Note: there may be some gaps in the listed date ranges, or ongoing outages that are not listed here *SOD data had sensor issues from Mar 2020-Nov 2020 Site | Site Name | Watershed | Start Date | End Date | Lat | Lon | Elev ------------------------------------------------------------------------------------------------------- HDW | Headworks | Green/Duwamish | Oct 2023 | Present | 47.3089 | -121.8558 | 269m PVC | Potter Valley Central | Russian | Feb 2019 | Present | 39.3209 | -123.1028 | 290m CAT | Catalina Island | Santa Ana | Sep 2021 | Present | 33.4462 | -118.4828 | 37m SOD | Seven Oaks Dam | Santa Ana | Mar 2020 | Present | 34.1148 | -117.0875 | 787m GPO | Granite Portal | Tuolumne | Jan 2022 | Present | 37.9077 | -119.9531 | 1312m HMD | Hodgdon Meadow | Tuolumne | Aug 2021 | Present | 37.7962 | -119.8582 | 1395m HRD | Henness Ridge Drive | Tuolumne | Jul 2021 | Present | 37.6455 | -119.7038 | 1866m WPO | West Portal | Tuolumne | Aug 2021 | Present | 37.8133 | -120.2874 | 630m CHZ | Central Sierra Snow Lab | Yuba/Feather | Feb 2024 | Present | 39.3256 | -120.3580 | 2097m DLA | Downieville | Yuba/Feather | Aug 2020 | Present | 39.5633 | -120.8243 | 906m NBB | New Bullards Bar Dam | Yuba/Feather | Mar 2020 | Present | 39.3964 | -121.1435 | 632m The following stations transmit precipitation type data only via GOES, so the full data and plots are not updated in real time Site | Site Name | Watershed | Start Date | End Date | Lat | Lon | Elev ------------------------------------------------------------------------------------------------------- YLI | BNSF Y-Line | Green/Duwamish | Sep 2023 | Present | 47.2108 | -121.4878 | 482m The following stations are not telemetered: they are running in real time, but data is only uploaded following a site visit Site | Site Name | Watershed | Start Date | End Date | Lat | Lon | Elev ------------------------------------------------------------------------------------------------------- LBH | Lower Bath House | Yuba/Feather | Apr 2021 | Present | 39.6241 | -120.5777 | 1685m ------------------------------------------------------------------------ DATA DESCRIPTION ------------------------------------------------------------------------ data: NetCDF files containing only several most commonly used variables from the processed files (e.g. rain intensity and radar reflectivity). In addition, the data is resampled to 5 min intervals. plots: Plots of rain intensity, radar reflectivity, and drop size distribution. Note, plots are created using the original processed 10 sec time step data, which is not currently available on the datashare site. precip_type: Csv files containing 15-minute precipitation type data. Time is in UTC, with values representing the midpoint of each 15-minute interval. Values are given for the WMO SYNOP Tables 4680 and 4677, and are also translated into the SHEF code format according to the below table. ------------------------------------------------------------------------ PRECIPITATION TYPE ------------------------------------------------------------------------ The precipitation type is reported by OTT Parsivel2 disdrometers also deployed by CW3E. The output is on 15 minute timesteps. Disdrometer data is recorded every 10 seconds, so the original data is resampled to 15 min timesteps by finding the most frequently occurring precipitation type during each 15 min window (aka the statistical mode). Note that "Drizzle with rain" and "Rain, drizzle with snow" do not have direct analogues in the SHEF code, so the corresponding codes were combined. Disdrometer classification | SYNOP Table 4680 code | SHEF output code ------------------------------------------------------------------------ Drizzle | 51, 52, or 53 | 3 Drizzle with rain | 57 or 58 | 13 Rain | 61, 62, or 63 | 1 Rain, drizzle with snow | 67 or 68 | 135 Snow | 71, 72, or 73 | 5 Snow grains | 77 | 7 Soft hail | 87 or 88 | 6 Hail | 89 | 9 Refer to the OTT Parsivel2 user manual (Appendix D) as well as the SHEF code manual (Table 17) for more info. ------------------------------------------------------------------------ CHANGE LOG ------------------------------------------------------------------------ Mar 31, 2021: - Added condensed netCDF files to ftp site June 17, 2021: - Updated plots (moved legend to top to reduce whitespace, made time axis clearer) - Added plots to ftp site Aug 5, 2021: - Added Henness Ridge Drive (HRD) and West Portal (WPO) Jan 25, 2022: - Added Hodgdon Meadow (HDM): historical data only - Reprocessed CAT data to fix error Mar 6, 2024: - Updated station table, clarified text Feb 20, 2025: - Added precipitation type csv files