*Update 6/9/2016: A newer dataset with larger spatial extent and more recent data: 1/16 degree, CONUS + Mexico + S. Canada, 1950-2013 is available for download here: http://www.colorado.edu/lab/livneh/data The available data are at a daily time step and VIC simulations are also available. The citation describing the newere data can be found here: Livneh B., T.J. Bohn, D.S. Pierce, F. Munoz-Ariola, B. Nijssen, R. Vose, D. Cayan, and L.D. Brekke, 2015: A spatially comprehensive, hydrometeorological data set for Mexico, the U.S., and southern Canada 1950-2013, Nature Scientific Data, 5:150042, doi:10.1038/sdata.2015.42. *Update 3/17/2015: The daily VIC outputs are posted in both ASCII and netCDF while the derived 3-hourly data have been posted in ASCII format. At present there is no immediate plan to convert the ASCII 3-hrly files to netCDF *Update 12/9/2014: VIC-simulated SWE output was observed to 'glaciate' which is a long-standing issue in the snow model in which inter-year snowpacks accumulate to result in large (and in many cases) unrealistic accumulation totals. A decision was made to identify these grid cells on the basis of multi- year accumulation of >=200 mm of SWE over the period 1915-2011 and reset SWE to 0.0 at the start of each water year, regardless of the severity of the glaciation, which varies considerably across cells and regions. A list of affected grid cells is included in the file: glaciated.cells.txt and the amoutn of snow removed each year is included in files in the directory glacier.fix/ *Update 3/19/2014: The forcing dtata have been revised as version 1.2 after QA/QC geared towards temperatures (see DATA.STATUS.txt). Please use this citation if using any of these data: Livneh, B., E. A. Rosenberg, C. Lin, B. Nijssen, V. Mishra, K. M. Andreadis, E. P. Maurer, and D. P. Lettenmaier, 2013: A Long-Term Hydrologically Based Dataset of Land Surface Fluxes and States for the Conterminous United States: Update and Extensions. J. Climate, 26, 9384~9392. Description of data: These meteorological data represent approximately 20,000 stations across CONUS, (including a smaller number of Enviro-Can stations for the Canadian portion of the Columbia river) gridded to 211687 points at a 1/16 degree spatial resolution, running from 1 Jan 1915 - 31 Dec 2011 and with the following fields: Meteorology.nc.v.1.2.1915.2011.bz2: netCDF format -- see ascii columns below for fields available. Meteorologyasc.v.1.2.1915.2011.bz2: ASCII format columns: Daily VIC-derived outputs: Fluxes.asc.v.1.2.1915.2011.bz2/ ASCII Daily VIC outputs, model v.4.1.2.c Fluxes.nc.v.1.2.1915.2011.bz2/ netCDF Daily VIC outputs -- descriptions from VIC global file: OUTFILE VIC_fluxes_Livneh_CONUSExt_v.1.2_2013 12 OUTVAR OUT_EVAP (mm/s) Total ET rate-- includes Canopy, Sub-canopy Evaporation, Transpiration, and Snow Sublimation OUTVAR OUT_RUNOFF (mm/s) Surface Runoff OUTVAR OUT_BASEFLOW (mm/s) Baseflow OUTVAR OUT_SOIL_MOIST (mm) Three layer values of Soil Moisture, i.e. three columns starting with upper layer OUTVAR OUT_SWE (mm) Snow Water Equivalent OUTVAR OUT_WDEW (mm) Canopy Water OUTVAR OUT_SENSIBLE (W/m^2) Net Upward Sensible Heat Flux OUTVAR OUT_LATENT (W/m^2) Net Upward Sensible Heat Flux OUTVAR OUT_GRND_FLUX (W/m^2) Net Heat Flux into Ground OUTVAR OUT_R_NET (W/m^2) Net Downward Radiation Flux OUTVAR OUT_RAD_TEMP (K) Average Radiative Surface Temperature OUTVAR OUT_PREC (mm/s) Incoming Precipitation Rate Sub-daily VIC outputs Derived.Subdaily.Outputs.asc.v.1.2.1915.2011.bz2 ASCII sub-daily outputs (3-hrly) -- descriptions from VIC global file: OUTFILE VIC_subdaily_fluxes_Livneh_CONUSExt_v.1.2_2013 8 OUTVAR OUT_PREC mm/s Total precipitation rate OUTVAR OUT_AIR_TEMP K Near surface (2m) air temperature OUTVAR OUT_WIND m/s Near surface (10m) wind speed OUTVAR OUT_REL_HUMID fraction Near surface (2m) relative humidity OUTVAR OUT_SHORTWAVE (W/m^2) Downward solar radiation OUTVAR OUT_NET_SHORT (W/m^2) Net solar radiation OUTVAR OUT_LONGWAVE (W/m^2) Downward longwave radiation OUTVAR OUT_NET_LONG (W/m^2) Net longwave radiation The 4-field forcing data willbe available in either ASCII or netCDF format in the directories listed above. netCDF format for the derived variables will be posted, and we will make an effort to post the ASCII data as well, however, space limitations may prevent this. Questions regarding these data can be directed towards Ben Livneh: ben.livneh@colorado.edu, or Dennis Lettenmaier, dennisl@uw.edu. These data are available in both netCDF and ASCII formats, which were compressed with the bzip2 utility. To uncompress simply type: % bunzip2 Additional reference: Maurer E.P., A.W. Wood, J.C. Adam, B. Nijssen, and D.P. Lettenmaier: 2002: A long-Term Hydrologiclaly Based Dataset of Land Surface Fluxes and States for the Conterminous United States, J. Clim., 15, 3237-3251.