NOUS41 KWBC 211249



Technical Implementation Notice 14-37

National Weather Service Headquarters Washington DC

850 AM EDT Thu Aug 21 2014


To:       Subscribers:

          -Family of Services

          -NOAA Weather Wire Service

          -Emergency Managers Weather Information Network


          Other NWS Partners, Users and Employees


From:     Timothy McClung

          Science Plans Branch Chief

          Office of Science and Technology


Subject:  Hybrid Single-Particle Lagrangian Integrated

          Trajectory (HYSPLIT) Model Update Effective

          September 30, 2014


Effective on or about Tuesday, September 30, 2014, 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. There is no change to

the format of the model output.


Forecasts from the updated HYSPLIT model are available through a

parallel feed. The smoke HYSPLIT GRIB products for all three

domains (Continental U.S. (CONUS), Alaska and Hawaii) and the

dust product for CONUS from the parallel feed are disseminated

via the NCEP website:


The products also will be displayed through the NCEP website:


Current operational HYSPLIT model will continue providing

forecasts through


and displayed at


The scientific enhancements include the following:


-- Updated automated detection of fires in Canada, Mexico and

Central America that provide inputs for smoke emissions for

smoke predictions


-- Added 3-D particle model approach to properly represent the

additional fires identified with automatic fire detection


-- Modified the North American Mesoscale (NAM) Analysis and

Forecast System by updating radiation, convective

parameterization, microphysics, advection, hybrid variational

ensemble GSI analysis, satellite bias correction, quality

control of observations, satellite radiance assimilation,

diabatic digital filter, etc.


More details about the HYSPLIT are available at:


For questions regarding these updated predictions, contact:


Ivanka Stajner


Silver Spring, MD 20910

301 713 9001 x 185


NWS National Technical Implementation Notices are online at: