gov.noaa.nws.ohd.hdsc: OHD-HDSC-NOAAAtlas14V6v2011-CA NOAA/NWS/Office of Hydrologic Development, Hydrometeorological Design Studies Center 20110408 raster digital data NOAA Atlas 14 Volume 6 Silver Spring, MD, USA NOAA/NWS/Office of Hydrologic Development, Hydrometeorological Design Studies Center http://hdsc.nws.noaa.gov/hdsc/pfds/pfds_gis.html http://hdsc.nws.noaa.gov/hdsc/pfds/ http://www.nws.noaa.gov/ohd/hdsc/index.html This GIS grid atlas contains precipitation frequency estimates for California based on precipitation data collected between 1850-2010. This atlas is an updated version of volume XI (California) of NOAA Atlas 2, published in 1973 and volume 1 of NOAA Atlas 14 (Semiarid Southwest), published in 2006. The grids provide information for durations from 5 minutes through 60 days, and for return periods of 1 year through 1000 years. The grid data also contains estimates for Semiarid Southwest from NOAA Atlas 14 Volume 1 Version 5. Please see the metadata page for the Semiarid Southwest portion of the grid. Precipitation frequency (PF) estimates are used as basic design criteria for a wide variety of hydraulic structures such as culverts, roadway drainages, bridges and small dams. This dataset is for the display and/or analyses of spatially distributed point PF estimates. None 18501001 20101231 Climatological period from which the point precipitation observations were taken. Complete As needed. -124.75420 -102.98762 42.970820 31.329200 NASA GCMD Science Keywords Atmosphere > Precipitation > Precipitation Frequency ISO 19115 Topic Category climatologyMeteorologyAtmosphere None Southwest California Southwestern United States NASA GCMD Location Keywords Vertical Location > Ground Layer 1 NASA GCMD Science Keywords Atmosphere > Precipitation > Precipitation Frequency n/a, no restrictions apply and data is public domain. Acknowledgement of NOAA/National Weather Service, Office of Hydrologic Development, Hydrometeorological Design Studies Center (HDSC) NOAA/National Weather Service, Office of Hydrologic Development, Hydrometeorological Design Studies Center mailing and physical address

NOAA/NWS/Office of Hydrologic Development

SSMC2, W/OHD 12

1325 East-West Highway

Silver Spring MD 20910 USA (301) 713-0640 (301) 713-0963 hdsc.questions@noaa.gov 9 a.m. to 5 p.m. Eastern, Monday-Friday http://hdsc.nws.noaa.gov/hdsc/pfds/meta/images/ca1_web_thumbnail.png CA 100-year 24-hour PNG None Unclassified None Microsoft Windows XP NOAA/National Weather Service, Office of Hydrology 1973 document NOAA Atlas 2 Vol 11 Silver Spring, MD, USA NOAA/National Weather Service, Office of Hydrology http://www.nws.noaa.gov/ohd/hdsc/noaaatlas2.htm http://www.wrcc.dri.edu/pcpnfreq.html NOAA/National Weather Serivce, Office of Hydrology 2004 document NOAA Atlas 14 Vol 6 v2 Silver Spring, MD, USA NOAA/National Weather Serivce, Office of Hydrology http://hdsc.nws.noaa.gov/hdsc/pfds/ http://www.wrcc.dri.edu/pcpnfreq.html U.S. Weather Bureau and U.S. Department of Agriculture 1964 document Technical Paper No. 49 Silver Spring, MD, USA U.S. Weather Bureau http://www.nws.noaa.gov/ohd/hdsc/studies/prcpfreq.html All attributes created during the creation process were tested for internal consistency. In addition, thorough comparisons where conducted with NOAA Atlas 2. All data were based on precipitation-reporting stations that had at least 20 years of 15-minute, hourly, and/or daily precipitation data between 1850 and 2010. Similar quality assurance procedures were used with all input data sets. Observed point precipitation values originated from a variety of sources. All station data were subjected to quality control checks by the National Climatic Data Center (NCDC), the Bureau of Reclamation and the National Weather Service. Some data what was not already digitized by NCDC was done so by the Bureau of Reclamation. National Climatic Data Center (NCDC) 2010 tabular digital data DSI3240 None Asheville, NC National Climatic Data Center (NCDC) http://cdo.ncdc.noaa.gov/pls/plclimprod/cdomain.abbrev2id?datasetabbv=DS3240&countryabbv=&GEORegionabbv=&Forceoutside= online 19480101 20101231 ground condition NCDC Climate Data Online -Precipitation Data, Hourly, http://gis.ncdc.noaa.gov/website/ims-cdo/preciphr/, 20110531 hourly precipitation information National Climatic Data Center (NCDC) 2010 tabular digital data DSI3260 None Asheville, NC National Climatic Data Center (NCDC) http://lwf.ncdc.noaa.gov/oa/ncdc.html online 19480101 20101231 ground condition NOAA National Climatic Data Center (NCDC) ArcGIS Services, http://gis.ncdc.noaa.gov/rest/services/cdo/precip15/MapServer,20110531 15-minute precipitation information National Climatic Data Center (NCDC) 2010 tabular digital data DSI-3200, DSI-3202, DSI-3206, DSI-3210 None Asheville, NC National Climatic Data Center (NCDC) http://lwf.ncdc.noaa.gov/oa/ncdc.html online 19480101 20101231 ground condition NOAA National Data Center (NCDC) Online Store, http://www1.ncdc.noaa.gov/pub/data/documentlibrary/tddoc/td3202.pdf, 20110531 daily precipitation information Alameda County Flood Control & Water Conservation District Unknown tabular digital data None None Hayward, California 94544-1395 Alameda County Flood Control & Water Conservation District http://www.acgov.org/pwa/ online 18880701 20091031 ground condition Hydrologic Data. ACFCD. http://www.acgov.org/pwa/. 4/24/2009 daily, hourly, and alert precipitation information California Nevada River Forecast Center (CNRFC ) Unknown None None Sacramento, CA 95821-6373 CNRFC online 19970401 20061231 ground condition Hartman, Ron. ALERT data. March 2007. E-mail. daily alert precipitation information U.S. Army Corps of Engineers (USACE) Unknown None None Sacramento, CA 95814 U.S. Army Corps of Engineers http://www.spk.usace.army.mil disc 19400101 20061231 ground condition U.S. Army Corps of Engineers.’’Daily and hourly precipitation’’.January 2007.DVD. daily and hourly precipitation information Contra Costa County Flood Control and Water Conservation District Unknown None None Sacramento, CA 95814 Contra Costa County Flood Control and Water Conservation District http://www.co.contra-costa.ca.us/ online 19521001 20080731 ground condition Contra Costa County Flood Control and Water Conservation. http://www.co.contra-costa.ca.us . July 2008. 5-min, daily, precipitation information California Department of Water Resources (CDWR) Unknown None None Sacramento, CA 94236-0001 California Data Exchange Center (CDEC) http://cdec.water.ca.gov disc 19450101 20070331 ground condition CDWR.”Hourly and daily precipitation”.April 2007.DVD. hourly and daily precipitation information Fresno Metropolitan Flood Control District Unknown None None Fresno, CA 93727 Fresno Metropolitan Flood Control District http://www.fresnofloodcontrol.org disc 20020701 20070228 ground condition Fresno Metropolitan Flood Control District.”15-min and hourly precipitation”. May 2007.DVD. 15-min and hourly precipitation information Claire Trower Unknown None None Wilderidge, CA Claire Trower electronic mail system 19800101 20101231 ground condition Trower, Claire.””Daily Precipitation Data”.December 2010.E-mail. daily precipitation information Jim Goodridge, California State Climatologist Unknown tabular digital data None None Chico, California Jim Goodridge, California State Climatologist disc 19831001 20101031 ground condition Goodridge, Jim.”Hourly precipitation data”. February 2007.DVD. hourly precipitation information LA County, Department of Public Works Water Resources Division (LADPW) Unknown tabular digital data None None Los Angeles, California LADPW http://dpw.lacounty.gov/wrd/index.cfm disc 18720201 20070131 ground condition LACDPW County of Los Angeles. 5-min and daily precipitation data. March and June 2007.DVD. Daily and 5-min precipitation data Marin County Flood Control and Water Conservation District Unknown tabular digital data None None San Rafael, CA 94903 Marin County Civic Center http://www.co.marin.ca.us/ electronic mail system 18771001 20080331 ground condition Conatser, Neal.”Precipitation Data”.March 2008.E-mail. n-min, hourly, daily precipitation AMS data NCDC Unknown None None Asheville, NC National Climatic Data Center (NCDC) http://www.ncdc.noaa.gov/oa/ncdc.html online 19730101 20071231 ground condition NCDC. http://www.ncdc.noaa.gov/oa/ncdc.html .September 2010. n-minute precipitation information Orange County Public Works, Orange County Watersheds Unknown tabular digital data None None Orange County, California Orange County Public Works, Orange County Watersheds http://www.parks.ca.gov/ disc 19710701 20071130 ground condition California Department of Parks and Recreation.”ALERT data”.May 2007.DVD. ALERT precipitation information Remote Automated Weather Stations (RAWS) Unknown tabular digital data None None Reno, Nevada 89512 Western Regional Climate Center (WRCC) http://www.raws.dri.edu/index.html online 19661001 20101031 ground condition Hourly Remote Automated Weather Stations (RAWS) data.Western Regional Climate Center (WRCC).http://www.raws.dri.edu/index.html .March 2008. precipitation information Riverside County Flood Control and Water Conservation District (RCFCWCD) Unknown None None Riverside, CA 92501 Hydrologic Data Collection Section, RCFCWCD http://www.floodcontrol.co.riverside.ca.us/ electronic mail system 19400101 20070731 ground condition Clark, Steven.”Precipitation data”.July 2007.E-mail. ALERT and hourly precipitation information San Bernardino County Flood Control District Unknown None None San Bernardino, California San Bernardino County Flood Control District electronic mail system 19451001 20100930 ground condition San Bernardino County Flood Control. “Precipitation data.” September 2010. DVD ALERT precipitation information County of Santa Barbara, Flood Control and Water Conservation District Unknown None None Santa Barbara, CA 93101 Santa Barbara County Flood Control District http://www.countyofsb.org/pwd/pwwater.aspx disc 18671101 20070531 ground condition Santa Barbara County Flood Control District. “Precipitation Data”.July 2007.DVD. ALERT, hourly, and daily precipitation information Santa Clara Valley Water District Unknown tabular digital data None None San Jose, CA 95118 Santa Clara Valley Water District http://www.valleywater.org/ disc 18730701 20100731 ground condition Santa Clara Valley Water District. “Precipitation data”. October 2010.DVD. ALERT and daily precipitation data San Diego Flood Control District Unknown None None San Diego, CA 92123 San Diego Flood Control District, Department of Public Works http://sdcfcd.org electronic mail system 18501001 20070228 ground condition Allen, Rand. “ALERT precipitation data”.March 2007.E-mail ALERT, 15-minute, hourly, and daily precipitation information Natural Resources Conservation Service, SNOTEL Precipitation Data Unknown None None Portland, Oregon 97232-1274 Natural Resources Conservation Service http://www.wcc.nrcs.usda.gov/snotel/California/california.html online 19031001 20100930 ground condition daily and hourly precipitation data. NRCS. http://www.wcc.nrcs.usda.gov/snotel/California/california.html .September 2010. daily precipitation information Ventura County Watershed Protection District Unknown None None Ventura CA 93009 Ventura County Watershed Protection District http://www.vcwatershed.org/hydrodata disc 18730701 20070131 ground condition Ventura County Watershed Protection District.”Precipitation data”.February 2007.DVD ALERT and daily precipitation data This spatial dataset was prepared by spatially interpolating point precipitation frequency estimates. The precipitation frequency estimates were calculated using regional L-moment statistics based on an annual maximum data series. The spatial interpolation of the point precipitation frequency estimates was accomplished with PRISM coupled with a derivation process called the cascade, residual add-back (CRAB) procedure. So-called "index flood," otherwise known as the mean annual maximum, grids were created using PRISM, Parameter-elevation Regressions on Independent Slopes Model, at Oregon State University. PRISM is an analytical tool that uses point data, a digital elevation model, and other spatial data sets to generate gridded estimates of climatic parameters. PRISM is uniquely designed and constantly updated to map climate in the most difficult situations, including high mountains, rain shadows, temperature inversions, coastal regions, and other complex climatic regimes. Meanwhile, CRAB is used to actually derive the precipitation frequency grids. CRAB is a derivation process that utilizes the strong, linear relationship between a particular duration and frequency (e.g. 50-year 24-hour) and the next higher frequency (e.g. 100-year 24-hour). In fact, within an L-moment region this relationship is constant and known as the Regional Growth Factor (RGF). With the CRAB procedure however, a global (all-region) relationship is developed based on actual observing-site data, then the linear relationship is applied to the preceding grid (i.e. 50-year 24-hour) to establish a first guess 100-year 24-hour grid. Knowing regional differences occur, residuals (predicted minus observed) are calculated for each observing-site and then normalized (divided by) by the preceding estimate (50-year 24-hour). These (point) normalized residuals are then spatially interpolated to a grid. The resultant grid is then un-normalized by multiplying it by the preceding grid to obtain a grid of actual residuals, in inches. The last step is to simply add the residual grid to the first guess grid to arrive at the final 100-year 24-hour grid. The process, as the term cascade implies, utilizes a previously derived grid to derive the next grid. So the same process is followed for deriving the 200-year 24-hour grid, but instead of the 50-year 24-hour grid being used as the predictor, the new 100-year 24-hour grid is used. For more details about the processes used to create this grid, please see the project quarterly reports posted here: <http://www.nws.noaa.gov/ohd/hdsc/current-projects/project.html> or the NOAA Atlas 14 Documention. 20100301 Raster integer Grid Cell 1397 2612 1 0.00833333 0.00833333 Decimal degrees North American Datum of 1983 Geodetic Reference System 80 6378137.000000 298.257222 precipitation frequency grid cell value ASCII integer Self-evident precipitation frequency grid cell value gridded precipitation frequency estimates NWS/OHD/HDSC Sequential unique whole numbers that are automatically generated. Value Feature geometry. Grid cell precipitation in inches*1000 HDSC 0 9999999 1000ths of inches; -999 is missing .01 measurement accuracy of precipitation gauges in inches NOAA/NWS/OHD/Hydrometeorological Design Studies Center mailing address

NOAA/NWS/Office of Hydrologic Development

SSMC2, W/OHD 12

1325 East-West Highway

Silver Spring MD 20910 USA (301) 713-0640 Downloadable data. Users must assume responsibility to determine the appropriate use of these data. ASCII 17.2 HDSC PFDS; swXyrYY (X = return period, YY = duration; u = upper limit, l= lower limit) for partial duration series, _ams for annual maximum series Web download None A grid- or raster-based GIS, such as ArcInfo (GRID) or Arcview 3.x/8.x/9.x (with Spatial Analyst Extension). The grids can however be converted into GRASS ASCII grids by manipulating the header. 20110408 NOAA/NWS/OHD/Hydrometeorological Design Studies Center N/A mailing address

NOAA/NWS/Office of Hydrologic Development

SSMC2, W/OHD 12

1325 East-West Highway

Silver Spring MD 20910 USA (301) 713-0640 (301) 713-0963 hdsc.questions@noaa.gov 9 a.m. to 5 p.m. Eastern, Monday-Friday FGDC Content Standard for Digital Geospatial Metadata FGDC-STD-012-2002 local time