February 1, 2024 - HYSPLIT Upgraded to Version 5.3.2
All HYSPLIT calculations on the READY website will be using the upgraded version.
December 4, 2023 - HYSPLIT Upgraded to Version 5.3.0
All HYSPLIT calculations on the READY website will be using the upgraded version.
May 5, 2023 - e-Hysplit repaired
The e-Hysplit system for running HYSPLIT trajectories via email had an issue of receiving emails. This is fixed.
April 19, 2023 - Emergency reboot
To address a hardware issue, READY was rebooted at about 8am, outside the scheduled maintenance window.
December 9, 2022 - Time change for preventive maintenance
Future preventive maintenance will be performed from 8am to 9:30am.
January 24, 2022 - HYSPLIT Upgraded to Version 5.2.0
All HYSPLIT calculations on the READY website will be using the upgraded version.
January 10, 2022 - Locust Forecast Upgraded to Version 0.5.3
A new optional feature for water-landing-avoidance is added.
August 23, 2021 - READY Web API Upgraded to Version 0.0.2
Seven additional meterologies are supported by the READY Web API for sounding profile.
May 19, 2021 - HYSPLIT Upgraded to Version 5.1.0
All HYSPLIT calculations on the READY website will be using the upgraded version.
January 22, 2021 - Meteorological data update issue
NCEP's NOMADS is unavailable from 1/21 12:00Z to 1/22 07:00Z for maintenance. READY will not receive meteorological data files during the NOMADS outage. Please refer to https://www.weather.gov/media/notification/pdf2/scn20-118nomads_outageaaac.pdf for details.
November 17, 2020 - Unscheduled Maintenance
The READY site will be down from 5pm EST today for an urgent maintenance. We expect it to be back within an hour.
August 27, 2020 - Server Migration
The READY site has been migrated to a new server.
June 4, 2020 - HYSPLIT Upgraded to Version 5.0.0
All HYSPLIT calculations on the READY website will be using the upgraded version.
May 13, 2020 - Locust Forecast
A web application for locust forecast is now available at https://locusts.arl.noaa.gov.
January 10, 2020 - Center-of-Mass Trajectory
HYSPLIT dispersion has a new option to compute and output the center-of-mass trajectory. The standard deviations of the center-of-mass coordinates are included in the output.READY utilizes the new option and plots the center-of-mass trajectory along with ellipses of uncertainty.The option is located on the Model Run Details page of a dispersion model, under the Runtime Parameterssection.
August 30, 2017 - Automated HYSPLIT Dispersion Forecasts
HYSPLIT has been configured to automatically produce atmospheric dispersion forecasts for several locations four times daily. These locations may change based on the needs of NOAA and its partners. The model assumes a unit of mass emission over 6 hours and produces graphics for two concentration grids: a fine grid (~ 1km horizontal resolution) and a coarse grid (~10 km horizontal resolution). Output on the fine grid extends from hour 1 to hour 12 each hour, while the coarse extends from hour 2 to hour 60 every 2 hours.
To view the model results you need to be a HYSPLITregistered user. The URL is:https://www.ready.noaa.gov/READY_hyauto.php
June 26, 2017 - READY paper published
A research paper providing an overview of READY titled "Real-time Environmental Applications and Display sYstem: READY" is now available. Any research paperspublished using READY products should include a reference to this paper.
October 17, 2016 - New READY web site -
A new READY web site was brought online on Monday, October 17. Some new features include:
- Access to 3 km High Resolution Rapid Refresh (HRRR) meteorological data forecasts and archives on sigma and pressure surfaces through READY meteorological display programs and the HYSPLIT dispersion model. HRRR forecast animations are also available.
- Access to the 4 km CONUS Nest forecasts on sigma-hybrid pressure surfaces in READY and HYSPLIT
- Short-Range Ensemble Forecast (SREF) dispersion products that can be moved by ARL to an ongoing event location that includes dispersion forecasts for individual members and ensemble statistical plots (HYSPLIT runs using the SREF forecasts will be coming soon)
- Trajectory frequency analysis of HYSPLIT trajectories based on up to 31 day trajectories
- Faster processor and more memory for calculations
August 8, 2016 - HRRR and 4 km NAM CONUS Nest added to forecast extract -
The High Resolution Rapid Refresh (HRRR) model and 4 km NAM CONUS Nest forecasts were added to the READY forecast data extract program (https://www.ready.noaa.gov/ready2-bin/extract/extractf.pl).For those that need to download a portion of these high resolution data sets, this applicationallows the user to extract the data based on an area and/or time.
August 1, 2016 - The High Resolution Rapid Refresh (HRRR) model added to READY -
The High Resolution Rapid Refresh (HRRR) model was added to all HYSPLIT and meteorologicaldisplay programs. The HRRR contains sigma level forecast data every hour from forecast hours 0 to 15 on a 3 km 1799 x 1059 grid covering the United States and Southern Canada.
January 14, 2015 - New 1 degree GFS forecasts -
NCEP upgraded their Global Forecast System (GFS) forecasts and the result was the 1 degree GFS was extended from 192 hours to 240 hours, while the GFSLR was reduced to 240-384 hours but went from a 2.5 degree horizontal resolution to a 1 degree horizontal resolution grid for READY/HYSPLIT. More details can be found:
https://www.ready.noaa.gov/archives.php
December 30, 2014 - 32 km North American Regional Reanalysis (NARR) data added -
The NARR 32 km horizontal resolution grid was added to READY. This data set has data available on 22 pressure levels every 3 hours over North America from 1979 to 2014. Details on the data set can be found by clicking on this link and scrolling down to the NARR:
https://www.ready.noaa.gov/READYmetdata.php
October 16, 2014 - 0.5-degree GFS forecast added -
A 0.5-degree latitude-longitude horizontal resolution grid was added to READY. This data set has data available on 56 sigma-pressure hybrid levels. Details on the data set can be found by clicking on this link:
https://www.ready.noaa.gov/READYmetdata.php
November 13, 2012 - HYSPLIT Forum created -
A phpBB Forum for HYSPLIT has been created to allow users of HYSPLIT to communicate questions, problems, and ideas for upgrades with other users and developers. Users need to register to post to the site. The site can be found by clicking on this link:
https://hysplitbbs.arl.noaa.gov/
May 1, 2012 - RAP replaces RUC meteorological data -
The Rapid Refresh Model replaced the RUC model at NOAA NCEP and as a result the RAP data is now used by READY. The RAP output is identical to the RUC except that the forecast goes out to 18 hours instead of 12. Details on the data set can be found by clicking on this link:
https://www.ready.noaa.gov/READYmetdata.php
April 25, 2012 - Updated HYSPLIT Verification web site -
The HYSPLIT Verification using the DATEM tracer archive web site has been thoroughly reviewed and updated to make the results more understandable to the user. Details can be found by clicking on this link:
https://www.ready.noaa.gov/HYSPLIT_datem.php
October 25, 2011 - New NAM Grids -
As a result of recent upgrades to the NAM model at NCEP, several new gridshave been added to READY including a 2 km Hawaii NAM NEST and a 12 km Alaska grid. In addition, several new fields have been added to the NAM Tiles. Details can be found by clicking on this link:
https://www.ready.noaa.gov/READYmetdata.php
May 6, 2010 - Gulf of Mexico Trajectories -
Automated trajectories over the Gulf of Mexico have been added to the current U.S. Trajectories web page. Details can be found by clicking on the linkto the Gulf of Mexico at:
https://www.ready.noaa.gov/READY_traj_pick.php
April 15, 2010 - 2010 HYSPLIT Workshop Registration -
A 3 day HYSPLIT workshop will be given June 23 - 25, 2010 in Silver Spring, Maryland. The workshop will focus on the use of the recently updated version 4.9 of the model and its Graphical User Interface (GUI).
January 29, 2010 - Online Meteorological Data Extract -
A new web-based program has been posted to READY that will allow users to create an extract (time, area, or both) of our forecastor archived meteorological datasets and download them to the PC foruse with the PC HYSPLIT dispersion model. Links to the programs can be found in the left navigation bar of READY or below:
- Forecast Extract
- Archive Extract
January 28, 2010 - HYSPLIT Model Version 4.9 Update Release
An update to the HYbrid Single-Particle Lagrangian Integrated Trajectory (HYSPLIT) model was released to the public, as a downloadable version, through the Air Resources Laboratory's web site on January 28. Many of the changes made by ARL since the last update (February 2009) are technical improvements and bug fixes. The model is available for download for Windows or Apple systems.
June 8, 2009 - 2009 HYSPLIT Training Documents Made Available -
The training materials from the recent HYSPLIT Training Workshop held in Silver Spring, Maryland, are now available on the HYSPLIT webpage underthe link to PC HYSPLIT Training Workshops or go to this address:
https://www.arl.noaa.gov/HYSPLIT_workshop.phpAugust 25, 2009 - Beta version of READY available
In an attempt to transition READY from an IBM AIX server to a LINUX server, a new Beta version of READY has been releasedfor viewing at https://www.ready.noaa.gov.It is planned to completely move to the LINUX server within the nextfew weeks.
February 24, 2009 - HYSPLIT Model Version 4.9 Release
A major update to the HYbrid Single-Particle Lagrangian Integrated Trajectory (HYSPLIT) model was released to the public, as a downloadable version, through the Air Resources Laboratory's web site on February 24th. Many of the changes made by ARL since the last update (February 2008) are technical improvements, including the availability of higher spatial resolution meteorological data archives and forecasts. There also have been substantial modifications to the user interface to provide a more consistent color scheme through all the menus. The model is available for download for Windows or Apple systems.
May 5, 2008 - 2008 HYSPLIT Training Documents Made Available -
The training materials from the recent HYSPLIT Training Workshop held in Silver Spring, Maryland, are now available on the HYSPLIT webpage underthe link to PC HYSPLIT Training Workshops or go to this address:
https://www.arl.noaa.gov/HYSPLIT_workshop.phpOctober 19, 2007 - PDF Output Option -
Added an option in most READY programs to add a link to a PDF file of the graphics.
October 18, 2007 - New Meteorological Mapping Tool -
A new meteorological mapping program that performs most of the functions of the currentInteractive Map program has been made available for testing on the Current and Archived Meteorologypages of READY. This version does not rely on the NCAR Graphics software, but makes useof the freely available PSPLOT fortran routines, which creates PostScript output. The graphics are converted from PostScript to gif for smaller file sizes. At some point in the future wewill be removing the Interactive Map program and the Java-Based Interactive Map program as we cannot support NCAR Graphics.
September 28, 2006 - READY Meteorological Programs Updated -
The meteorogram, profile, stability, windgram and windrose programs have all been convertedfrom NCAR Graphics to the freely available PSPLOT fortran routines. Graphics are convertedfrom Postscript to gif.
September 21, 2006 - HYSPLIT Web-Version Update
Many additional features were recently added to the registered users web version of HYSPLIT trajectories.- GFS Forecast Data
An option has been added to theforecast trajectories to enable trajectories that run off the chosen meteorology grid (in time or space) to continue running with the current Global Forecast System (GFS) meteorological data if the date range is available. The current GFS forecast dataset contains 48 hours of analysis and 84 hours of forecast data. CAUTION: the initialization times of the chosen meteorological dataset and the GFS may be different dependingon the time of day.
- 3 Source Locations
Users now can enter up to 3 differenttrajectory source locations instead of just one. All trajectorieswill be calculated for all specified levels (1, 2 or 3) for a total of up to 9 trajectories per run.
- Trajectory Matrix Option
A trajectory matrix option will produce a grid of trajectories bounded by the first 2 entered source locations (trajectory 1 is the lower left grid point and trajectory 2 is the upper right grid point) and evenly spaced with a grid increment given by the distance between the lower left grid point (trajectory 2) and trajectory 3. Only one height is allowed.
- Trajectory Ensemble Option
A trajectory ensemble option will produce multiple trajectories from the first user-selected starting location. Each member of the trajectory ensemble is calculated by offsetting the meteorological data by a fixed grid factor (one grid meteorological grid point in the horizontal and 0.01 sigma units in the vertical). This results in 27 members for all-possible offsets in X,Y, and Z. Note: the starting height should be greater than 250 m for optimal configuration of the ensemble.
- Source Location Symbol
An option has been added to allow usersto turn on or off the source location symbol on the trajectorymap. This is useful for the trajectory matrix display.
- Rerun the model using user-defined defaults
A much neededoption has been implemented to allow users to rerun a trajectorycalculation by modifying the user entered defaults of thatparticular run to produce a new calculation with its own Job IDnumber.
July 12, 2006 - HYSPLIT and Google Earth -
Google Earth output is now available to all READY HYSPLIT users (see May 15, 2006 below fordetails).
May 19, 2006 - HYSPLIT Training Documents Made Available -
The training materials from the recent HYSPLIT Training Workshop held in Silver Spring, Maryland, are now available on the HYSPLIT webpage underthe link to PC HYSPLIT Training Workshops or go to this address:
https://www.arl.noaa.gov/HYSPLIT_workshop.php
The updated HYSPLIT model executables for this training workshop are not yet publicly available, but should be made available in late June or July.
May 15, 2006 - HYSPLIT and Google Earth -
HYSPLIT is now capable of exporting trajectories, air concentrations and deposition into the Google Earth software application. Google Earth, a free program to display layers of information on a three dimensional map of the earth, is available from:
Programs were developed at ARL to convert the trajectory endpoints and contours of concentration and deposition generated by HYSPLIT into Google Earth files. Google Earth provides the user with a method of overlaying a seemingly endless amount of free geo-referenced information onto the HYSPLIT output and providing the user with a tool to move about and within the model results. This capability is now available to registered users of HYSPLIT, both on the PC and the ARL web server. After a period of testing by registered users, the product will be made available to non-registered users of the web version as well.
January 25, 2006 - Date format change to profile output -
The header for the profile text listing has been reformatted to include a 2 digit month, day and hour and a 4 digit year.
January 18, 2006 - NAM 45 km Alaska grid data added to READY -
NAM 45 km horizontal resolution, 3 hourly, 36 hour forecast data is now available for use by HYSPLIT and meteorological display programs on the READY website.
