HWRF Users Page | Redirect> </head> <body> If you are not redirected automatically, follow this <a href='https://dtcenter.org/community-code/hurricane-wrf-hwrf'>link</a>.  <div id="ncarheader"> <img src="/HurrWRF/users/images/header_HurrWRF.jpg" alt="Website header"> </div> <div id="googlesearch"> <form name="google" method="get" action="http://www.google.com/search" > <a href="https://www2.ucar.edu/advanced-search">advanced</a> <input type=hidden name=hq value="site:www.ucar.edu"> <input type=submit name=sa value="Search UCAR"> <input type=text name=q size=12 maxlength=255> </form> </div> </div>  <div id="breadcrumb_nav"> <ul> <li>You are here: <a href="/index.php">DTC </a></li> <li>• <i>Hurricane WRF Users Page</i></li> </ul> </div> <div id="column_pagenav"> <div id="pagenav"> <div class="suckerdiv"> <ul id="suckertree1"> <li><a href="/HurrWRF/users/index.php">Home</a></li> <li><a href="/HurrWRF/users/others/index_termsofuse_HurrWRF.php">Terms of Use</a></li> <li><a href="/HurrWRF/users/overview/index.php">Overview</a></li> <li><a href="/HurrWRF/users/support/index.php">User Support</a> <ul>  <li><a href="/HurrWRF/users/support/release_notes/index.php">HWRF Release Notes</a></li> <li><a href="/HurrWRF/users/support/faqs/index.php">HWRF FAQ</a></li> <li><a href="/HurrWRF/users/support/known_issues/index.php">HWRF and Tracker Known Issues</a></li> <li><a href="/HurrWRF/users/support/datasets/index.php">Sources of HWRF Data</a></li> <li><a href="/HurrWRF/users/support/release_notes/index.tracker.php">GFDL Tracker Release Notes</a></li> <li><a href="/HurrWRF/users/support/index_help.php">Contact WRF for Hurricanes Help</a></li> </ul> </li> <li><a href="/HurrWRF/users/downloads/index.php">Downloads</a> <ul> <li><a href="/HurrWRF/users/downloads/ahw_download/index.php">AHW System</a></li> <li><a href="/HurrWRF/users/downloads/index.php">HWRF System</a></li> <li><a href="/HurrWRF/users/downloads/index.tracker.php">GFDL Vortex Tracker</a></li> <li><a href="/HurrWRF/users/downloads/observations/index.php">HWRF Datasets</a> <ul> <li><a href="/HurrWRF/users/downloads/observations/index.php">HWRF Datasets</a></li> <li><a href="/HurrWRF/users/downloads/observations/index.tracker.php">GFDL Tracker Datasets</a></li> </ul> </li> <li><a href="/HurrWRF/users/downloads/internal/index.php">Internal Info (UCAR only)</a> <ul> <li><a href="/HurrWRF/users/downloads/internal/index.php">Internal Info for HWRF (UCAR only)</a> <li><a href="/HurrWRF/users/downloads/internal/index.tracker.php">Internal Info for GFDL Tracker (UCAR only)</a> </ul> </li> </ul> </li> <li><a href="/HurrWRF/users/docs/index.php">Documentation</a></li> <li><a href="/HurrWRF/users/overview/hwrf_idealized.php">Idealized</a></li> <li><a href="/HurrWRF/users/tutorial/index.php">Tutorials & Workshops</a> <ul> <li><a href="/HurrWRF/users/tutorial/2018/index.php">Upcoming Tutorial</a></li> <li><a href="/HurrWRF/users/tutorial/index.php">Past Tutorials & Workshops</a></li> <li><a href="/HurrWRF/users/onlinetutorial/index.php">Online Tutorial</a></li> </ul> </li> <li><a href="/eval/hurricane">Testing and Evaluation</a></li> <li><a href="/HurrWRF/developers/index.php" target="_blank">HWRF Developers Info</a></li> <li><a href="/HurrWRF/users/others/index_links_HurrWRF.php">Additional Links</a></li> </ul> </div> </div> </div> <div id="wrap_pagecontent"> <div id="column_pagecontent"> <div id="pagefeature"> <div id="headingdiv"><h1>Release Notes</h1></div> </div> <h1>HWRF release notes</h1> <h2>HWRF Version 4.0a </h2> <li>HWRF System Upgrades in v4.0a</li> <ul> <ul> <li>Compatible with the 2018 operational HWRF.</li> <li>WRF upgraded to v4.0, updated GSI.</li> <li>Horizontal resolution increased from 18/6/2 km to 13.5/4.5/1.5 km</li> <li>D02 and D03 domain size decreased to ~ 17.8 x 17.8 degrees and ~ 5.9 x 5.9 degrees respectively.</li> <li>Number of vertical levels increased to 75 with a model top of 10 hPa for all ocean basins.</li> <li>Miscellaneous upgrades and bug fixes in various physical parameterizations. </li> <ul> <li> New cloud overlap method in RRTMG radiation parameterization.</li> <li> Updated horizontal diffusion and convergence damping coefficients.</li> </ul> <li> Ocean upgrades </li> <ul> <li> New POM domain for the north Central Pacific basin </li> </ul> <li> Initialization upgrades </li> <ul> <li> Dropsonde drifting is considered when assimilation is done </li> <li> Assimilating new data sets with GSI (GOES-16 AMV, NOAA-20, SFMR, TDR from G-IV) </li> </ul> <li>Adding precipitation rate (PRATE) variable in GRIB2 files. </li> </ul> </ul> <h2>HWRF Version 3.9a </h2> <li>HWRF System Upgrades in v3.9a</li> <ul> <ul> <li>Compatible with the 2017 operational HWRF.</li> <li>WRF upgraded to v3.9.1 and GSI to v3.6.</li> <li>D02 and D03 domain size decreased to ~ 24x24 degrees and ~ 7x7 degrees respectively.</li> <li>Number of vertical levels increased to 75 with a model top of 10 hPa for the AL, EP, and CP basins and to 61 with a model top of 10 hPa for the WP basin and NIO.</li> <li>Miscellaneous upgrades and bug fixes in various physical parameterizations. </li> <ul> <li> Updated Scale Aware Simplified Arakawa Shubert scheme for cumulus parameterization.</li> <li> Updated GFS Hybrid-Eddy Diffusivity Mass Flux PBL scheme. </li> <li> Updated Ferrier-Aligo microphysics scheme. </li> <li>Updated momentum and enthalpy exchange coefficients (Cd/Ch) in surface layer parameterization.</li> <li>Updated partial cloudiness scheme for RRTMG.</li> </ul> <li> Ocean upgrades </li> <ul> <li> Reduced coupling time step from 9 min to 6 min for ocean coupling </li> <li> Increased vortex tracking frequency. </li> <li> Number of vertical levels in MPIPOM-TC increased from 24 to 41.</li> </ul> <li> Initialization upgrades </li> <ul> <li> Use of a new composite storm vortex for improved vortex initialization </li> <li> Assimilating new data sets with GSI (hourly Atmospheric Motion Vectors /AMV/, clear-water-vapor AMV's) </li> </ul> <li>New version of GFDL vortex tracker</li> </ul> </ul> <h2>HWRF Version 3.8a </h2> <li>HWRF System Upgrades in v3.8a</li> <ul> <ul> <li>Compatible with the 2016 operational HWRF.</li> <li>WRF upgraded to v3.8, GSI to v3.5, and UPP to v3.1.</li> <li>D02 and D03 domain size increased to 25x25 and 8.3x8.3 respectively.</li> <li> Reduced time step from 38 4/7 s to 30 s. </li> <li> Data Assimilation enabled by default for both Atlantic and Eastern North Pacific basins. </li> <li> Initialization with RTOFS data in the Eastern North Pacific basin. </li> <li>Atmosphere-ocean coupling enabled for all N. Hemispheric basins.</li> <li>Miscellaneous upgrades and bug fixes in various physical parameterizations. </li> <ul> <li> New Scale Aware Simplified Arakawa Shubert scheme for cumulus parameterization. Cumulus parameterization enabled by default for all 3 domains.</li> <li> New GFS Hybrid-Eddy Diffusivity Mass Flux PBL scheme. </li> <li>Updated momentum and enthalpy exchange coefficients (Cd/Ch).</li> <li>Enhanced Idealized capability with landfall option (for GFDL slab scheme).</li> </ul> <li>Enhanced products including simulated brightness temperatures for new satellite sensors in all basins</li> </ul> </ul> <h2>HWRF Version 3.7a </h2> <li>HWRF System Upgrades in v3.7a</li> <ul> <ul> <li>Compatible with the 2015 operational HWRF</li> <li>WRF upgraded to v3.7, GSI to v3.4, and UPP to v3.0</li> <li>Default horizontal resolution increased to 18/6/2 km (backward compatibility supported to run 27/9/3 km)</li> <li>Vortex initialization algorithm improved to utilize the increased resolution of both GFS and HWRF</li> <li>Coupled atmosphere-ocean and data assimilation supported for all ocean basins</li> <li>Improved atmospheric physics for all scales</li> <ul> <li>Replaced GFDL radiation parameterization with Rapid Radiative Transfer Model(RRTMG) and introduced sub-grid scale cloudiness parameterization</li> <li>Modified specification of drag coefficient for momentum in the surface layer parameterization </li> <li>Improved the GFS planetary boundary layer parameterization with specification of wind-speed dependent vertical mixing</li> <li>Replaced GFDL slab model with the Noah Land Surface Model</li> </ul> <li>Enhanced products including simulated brightness temperatures for new satellite sensors in all basins</li> </ul> </ul> <h2>HWRF Version 3.6a </h2> <li>HWRF System</li> <ul> <li>HWRF supported for all ocean basins, including Southern Hemisphere. Coupled forecast are supported only in AL and EP</li> <li>Revised set of scripts in Python language</li> <li>Bug fixes to address many of the Known Issues of v3.6b </li> <li>Updated to support new capabilities described above</li> </ul> <li>WRF model</li> <ul> <li>Upgraded WRF to v3.6a</li> <li>Revised nest tracking algorithm</li> </ul> <li>Princeton Ocean Model for Tropical Cyclones</li> <ul> <li>New MPIPOM-TC for running single transatlantic ocean domain and 3D coupling for Eastern North Pacific domain</li> <li>Increased resolution (1/12deg) with MPIPOM-TC </li> </ul> <li>Vertical levels and resolution</li> <ul> <li>HWRF now has 61 levels with model top at 2 hPa</li> <li>3-km nest has expanded to 7.1x7.1 deg and 9km nest expanded to 12 x 12 deg </li> </ul> <li>Data assimilation</li> <ul> <li>GSI upgraded to version 3.3. Configuration changed to perform assimilation only on HWRF 9- and 3-km domains. Many datasets assimilated, including satellite radiances, GPS Radio Occultation, and aircraft tail Doppler radar winds. </li> </ul> <li>Vortex Initialization</li> <ul> <li>Revised Vortex Initialization and cycling of INVEST storms</li> </ul> <li>Postprocessing</li> <ul> <li>Advanced diagnostic products</li> </ul> <h2>HWRF Version 3.5b </h2> <ul> <li>HWRF System</li> <ul> <li>Only minor changes from v3.5a</li> <li>Bug fixes to address many of the Known Issues of v3.5a </li> <li>Added capability to support initializing from GFS GRIB files</li> </ul> <li>WRF model</li> <ul> <li>Bug fix for compiling on AIX with XLF.</li> </ul> <li>Princeton Ocean Model for Tropical Cyclones</li> <ul> <li>No change from v3.5a</li> </ul> <li>Data preprocessing</li> <ul> <li>HWRF can now be run from GFS GRIB files</li> </ul> <li>Data assimilation</li> <ul> <li>Bug fix applied for TDR assimilation quality control.</li> </ul> <li>Vortex Initialization</li> <ul> <li>No change from v3.5a</li> </ul> <li>Postprocessing</li> <ul> <li>No change from v3.5a</li> </ul> <li>Scripts and wrappers</li> <ul> <li>Bug fix applied for POM-TC initialization script</li> <li>Update to support new capabilities described above</li> </ul> </ul> <h2>HWRF Version 3.5a </h2> <ul> <li>HWRF System</li> <ul> <li>Upgrade to contain 2013 HWRF operational capability</li> <li>Support for NetCDF and binary I/O format</li> </ul> <li>WRF model</li> <ul> <li>Upgraded to WRF v3.5a, the HWRF 2013 operational capability added to WRF v3.5</li> <li>GFS planetary boundary layer (PBL) parameterization (bl_pbl_physics=3) updated to use a variable critical Richardson number</li> <li>Revised algorithm for internal vortex tracking</li> <li>Nest-parent interpolation routines rewritten for faster computation</li> <li>Supported use in all Northern Hemisphere basins</li> <li>Tropical Cyclone idealized capability</li> <li>Ability to run with alternate microphysics schemes</li> <li>Configuration revised to use larger inner nest and shorter physics timesteps</li> </ul> <li>Princeton Ocean Model for Tropical Cyclones</li> <ul> <li>Upgrades on atmosphere-ocean fluxes to better represent storm intensity</li> </ul> <li>Data preprocessing</li> <ul> <li>New community supported tool, prep_hybrid, allows ingestion of spectral global model data in its native sigma vertical levels, in binary format</li> </ul> <li>Data assimilation</li> <ul> <li>Upgrade to Gridpoint Statistical Interpolation (GSI) v3.2</li> <li>Ability to use ensemble-variational hybrid data assimilation</li> <li>Ability to ingest Tail Doppler Radar from aircraft reconnaissance</li> <li>Support for First Guess at Appropriate Time (FGAT), a capability to assimilate observations over a time window using a time sequence of first guess backgrounds</li> </ul> <li>Vortex Initialization</li> <ul> <li>Upgrades for better representation of weaker storms</li> </ul> <li>Postprocessing</li> <ul> <li>Extended support for simulated synthetic satellite imagery</li> </ul> <li>Scripts and wrappers</li> <ul> <li>Update to support new capabilities described above</li> </ul> </ul> <h2>HWRF Version 3.4a </h2> <ul> <li>WRF model component upgraded to WRF v3.4a, the HWRF 2012 Operational Capability added to WRF v3.4</li> <ul> <li>Three domains, parent and two telescoping storm-following moving nests with 27-, 9- and 3-km horizontal grid spacing.</li> <li>Upgraded SAS cumulus scheme now with both deep and shallow convection.</li> <li>New internal vortex tracking algorithm designedfor high resolution.</li> <li>Improved physics interoperability, with additional physics schemes now working with the HWRF configuration.</li> <li>Updates to the PBL and microphysics schemes for improved forecasts.</li> <li>Optional high frequency (each time step) ascii output of storm location, maximum surface winds, and radius of maximum winds.</li> </ul> <li>Vortex initialization algorithm revised for the new high-resolution 3rd moving nest.</li> <li>East Pacific domain for the ocean component Princeton Ocean Model (POM) added.</li> <li>GSI upgraded to v3.1, with additional HWRF specific modifications.</li> <li>Postprocessing UPP upgraded to create satellite images.</li> <li>GFDL vortex tracker upgraded to include cyclogenesis tracking and hurricane diagnostics of thermodynamic phase.</li> <li>Revised HWRF system run scripts.</li> <li>Miscellanous bug fixes.</li> </ul> <h2>HWRF Version 3.3a </h2> <ul> <li>WRF model upgraded to WRF v3.3a, the HWRF 2011 Operational Capability added to WRF v3.3</li> <ul> <li>Simplified Arakawa Schubert (SAS) cumulus parameterization scheme upgraded to the scheme used in the GFS model</li> <li>Surface momentum and enthalpy flux calculation modified to better match observations</li> <li>CO2 transmission coefficient now calculated at run time</li> <li>Preliminary development towards optional third moving nest domain capability added</li> <li>Preliminary development towards alternate vortex following algorithm added</li> <li>Recent bug fixes made to SAS, microphysics, and radiation will make the answer of the community HWRF code differ from the code implemented for 2011 operations at NCEP. </ul> <li>Vortex initialization algorithm revised with improved storm size correction and improved initial mass-wind balance </li> <li>Grid-Point Statistical Interpolation (GSI v2.5) data assimilation capability added</li> <li>East Atlantic domain for the ocean component Princeton Ocean Model (POM) added</li> <li>Postprocessing upgraded from WPP to Unified Post Processor (UPP)</li> <li>Other bug fixes</li> </ul> <h2>HWRF Version 0.9 beta </h2> <ul> <li>The beta release consists of customized versions of the components, HWRF utilities, POM-TC, NCEP Coupler, GFDL Vortex Tracker, WRF, and WPP.</li> <li>The beta release uses the public release version of WPS.</li> </ul> </ul> </div> <div id="column_subcontent_wrap"> <div id="column_related_fullwidth1"> <div id="column_related_fullwidth1"> <h2>Events</h2> <div id="events"> <p>No Upcoming Events</p> </div> <div id="Announcements"> <h2>Announcements</h2> <ur> <li>5 November 2018</li> <p><a href="/node/631">HWRF v4.0a Release</a></p> <li>23-25 January 2018 <p><a href= "http://www.dtcenter.org/HurrWRF/users/tutorial/2018">Hurricane WRF Tutorial</a></p> </li> </ur> </div> <h2>Organizations contributing to this website</h2> <table border="0"> <tr> <td>Developmental Testbed Center <a href="http://www.dtcenter.org/" target="_blank" >(DTC)</a></td> </tr> <tr> <td> NCAR's Mesoscale & Microscale Meteorology Division <a href="http://www.mmm.ucar.edu/" target="_blank" >(MMM)</a></td> </tr> </table > </div> </div>  <div id="column_related_fullwidth1"> <h2>Sponsors of WRF for Hurricanes</h2> <table border="0"> <tr> <td><a href="http://www.noaa.gov/"><img src="/HurrWRF/users/images/NCAR_logo.jpg" alt="NCAR logo" width="120" height="120" /></a> </td> <td><a href="http://www.noaa.gov/"><img src="/HurrWRF/users/images/noaa_logo_small.gif" alt="NOAA logo" width="90" height="90" /></a> </td> </tr> <tr> <td><a href="http://www.ncar.ucar.edu" target="_blank" >National Center for Atmospheric Research (NCAR)</a> </td> <td><a href="http://www.noaa.gov/" target="_blank" >National Oceanic and Atmospheric Administration (NOAA)</a> </td> </tr> </table> </div> <div id="column_related_fullwidth1"> <h2> Community HWRF Website Visits since v4.0a</h2> <a href="https://m.maploco.com/details/4c45weqs"><img style="border:0px;" src="https://www.maploco.com/vmap/s/9910180.png" alt="Locations of Site Visitors" title="Locations of Site Visitors"/></a>  </div> </div> </div> <br class="clearboth"/>  <div id="footer"> <div id="footer"> <p> ©2023, DTC • Postal Address: P.O. 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