NOUS41 KWBC 061850 AAB



Technical Implementation Notice 16-05 Amended

National Weather Service Headquarters Washington DC

250 PM EDT Mon Jun 6 2016


To:       Subscribers:

          -NOAA Weather Wire Service

          -Emergency Managers Weather Information Network


          Other NWS Partners, Users and Employees


From:     Timothy McClung

          Chief Operating Officer

          NWS Office of Science and Technology Integration


Subject:  Amended: Hybrid Single-Particle Lagrangian Integrated

          Trajectory (HYSPLIT) Model Update

          Effective date July 6, 2016


Amended to change the date from TBD to July 6, 2016


Effective Wednesday, July 6, beginning with the 1200 Coordinated

Universal Time (UTC) run, the National Centers for Environmental

Prediction (NCEP) will upgrade the HYSPLIT modeling system that

produces operational predictions of wildfire smoke and dust from

dust storms as well as volcanic ash. The output file names on the

NCEP ftp servers will change.


- Science Upgrades


1. No scientific enhancements to the smoke and dust products were



2. For volcanic ash, the wet deposition technique was

modified.  The new wet deposition technique has been shown to

give improved deposition results when there is precipitation for

an analogous application  (particulate from the Fukushima Nuclear

Power Plant), and hence is expected to also apply to volcanic


New volcanic ash trajectory products will be generated:


6 hour forward trajectories from the GFS at 1525, 3050, 4550,

6100, 9100, 12200, and 15200 m AGL for each of these volcanoes in



Akutan, Aniakchak, Atka, Augustine, Churchill, Cleveland, Dutton,

Gareloi, Great Sitkin, Griggs, Hayes, Iliamna, Kaguyak, Kanaga,

Kasatochi, Katmai, Mageik, Makushin, Martin, Novarupta, Okmok,

Pavlof, Pavlof Sister, Redoubt, Seguam, Semisopochnoi,

Shishaldin, Spurr, Trident, Ugashik-Peulik, Veniaminof, Westdahl,

and Wrangell.


- Expected Benefits


1. Improved Volcanic Ash predictions for ash in and near areas of

precipitation. Ash well-above clouds and precipitation will not

be affected.


2. Consistent GRIB2 smoke/dust output file name structure

3. New Volcanic Ash trajectories products for user (NWS,

USGS) requirements


- File name changes


The files found under this operational server will change:


1. The smoke directory and file name formats will change:


CONUS GRIB2 directory and files:         

/smoke.yyyymmdd -> /smokecs.yyyymmdd

smoke.t06z.grib2_pbl.1hr_227 -> smokecs.t06z.pbl.1hr_227.grib2

smoke.t06z.grib2_sfc.1hr_227 -> smokecs.t06z.sfc.1hr_227.grib2


Alaska GRIB2 files:    

smokeak.t06z.grib2ak_pbl.1hr_198 ->


smokeak.t06z.grib2ak_sfc.1hr_198 ->



Hawaii GRIB2 files:          

smokehi.t06z.grib2hi_pbl.1hr_196 ->


smokehi.t06z.grib2hi_sfc.1hr_196 ->



2. Additional files will be available:


The forecast duration HYSPLIT-formatted NAM CONUS Nest files will

be extended from 24-h to 48-h with the following files:





  hysplit.yyyymmdd/hysplit.tCCz.namsf42.CONUS, where CC=00,06,12,

or 18 and yyyymmdd is year, month, day.


For some meteorological situations, there may be improved HYSPLIT

dispersion guidance using NAM CONUS Nest predictions for longer

times (up to 48 hours) into the forecast.     


- Parallel data


Forecasts from the updated HYSPLIT model will be made available

through a parallel feed starting in late February, 2016. The

HYSPLIT smoke GRIB2 products for all three domains, CONUS

(continental US), Alaska and Hawaii and dust for CONUS from the

parallel feed are disseminated via the NCEP website:


The products for smoke and dust will be displayed through:


- Current operational HYSPLIT model will continue providing forecasts through:


Graphical display for smoke and dust at:


Display for Volcanic ash at:


More details about the HYSPLIT are available at:


For questions regarding these updated predictions, please contact:


Barbara Stunder

NOAA Air Resources Laboratory

College Park, Maryland



Jeff McQueen


College Park, Maryland



For questions regarding the dataflow aspects of these data sets please contact:


Carissa Klemmer

NCEP Dataflow Team

College Park, Maryland 20740



NWS National Technical Implementation Notices are online at: