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 Parameters
section.
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.
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 application
allows 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 meteorological
display 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 grids
have 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 link
to 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 forecast
or archived meteorological datasets and download them to the PC for
use with the PC HYSPLIT dispersion model. Links to the programs can be found
in the left navigation bar of READY or below:
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 under
the link to PC HYSPLIT Training Workshops or go to this address:
In an attempt to transition READY from an IBM AIX server to
a LINUX server, a new Beta version of READY has been released
for viewing at https://www.ready.noaa.gov.
It is planned to completely move to the LINUX server within the next
few 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 under
the link to PC HYSPLIT Training Workshops or go to this address:
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 current
Interactive Map program has been made available for testing on the Current and Archived Meteorology
pages of READY. This version does not rely on the NCAR Graphics software, but makes use
of 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 we
will 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 converted
from NCAR Graphics to the freely available PSPLOT fortran routines. Graphics are converted
from 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 the
forecast 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 depending
on the time of day.
3 Source Locations
Users now can enter up to 3 different
trajectory source locations instead of just one. All trajectories
will 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 users
to turn on or off the source location symbol on the trajectory
map. This is useful for the trajectory matrix display.
Rerun the model using user-defined defaults
A much needed
option has been implemented to allow users to rerun a trajectory
calculation by modifying the user entered defaults of that
particular run to produce a new calculation with its own Job ID
number.
July 12, 2006 - HYSPLIT and Google Earth -
Google Earth output is now available to all READY HYSPLIT users (see May 15, 2006 below for
details).
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 under
the link to PC HYSPLIT Training Workshops or go to this address:
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.
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.
READY News