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-------- Original Message -------- 794 NOUS41 KWBC 191106 PNSWSHTechnical Implementation Notice 13-16, Amended
National Weather Service Headquarters Washington DC 705 AM EDT Fri Jul 19 2013To: Subscribers:
-Family of Services
-NOAA Weather Wire Service
-Emergency Managers Weather Information Network
-NOAAPORT
Other NWS Partners, Users and Employees
From: Timothy McClung
Science Plans Branch Chief
Office of Science and Technology
Subject: Amended to postpone Hybrid Single-Particle Lagrangian
Integrated Trajectory (HYSPLIT) update date to
Tuesday, July 30, 2013 due to the delay in the
transition of the NCEP production suite to the WCOSS
supercomputer.
Amended to set the final effective date to July 30, 2013
Effective on or about Tuesday, July 30, 2013, beginning with the 1200 Coordinated Universal Time (UTC) run, the National Centers for Environmental Prediction (NCEP) will upgrade the HYSPLIT modeling system including smoke, dust and volcanic ash. The NOAA Air Resources Laboratory HYSPLIT subversion number 339 will be implemented as NCEP version 7.0.0 on NCEPs new Weather and Climate Operational Supercomputing System (WCOSS), scheduled to become the operational machine on July 30, 2013. A separate TIN will be issued announcing the operational switch to the WCOSS system. In the event that switch date is changed, this TIN will be modified to reflect that change in implementation date. Forecasts from the updated HYSPLIT model were made available through a parallel feed from WCOSS starting around June 19, 2013. The smoke and dust HYSPLIT GRIB products from the parallel feed are disseminated via the NCEP website: http://www.emc.ncep.noaa.gov/mmb/aq/hysplit/grib/ and the products will be displayed through NCEPs website: http://www.emc.ncep.noaa.gov/mmb/aq/hysplit/web/html/#pictureCurrent operational HYSPLIT model will continue providing
forecasts through NCEP Central Computing System (CCS) until the WCOSS machine goes live on July 30, 2013. At that time updated WCOSS smoke and dust predictions will be distributed through ftp://tgftp.nws.noaa.gov/SL.us008001/ST.opnl/DF.gr2/DC.ndgd/GT.a q/AR.conus/ ftp://tgftp.nws.noaa.gov/SL.us008001/ST.opnl/DF.gr2/DC.ndgd/GT.a q/AR.alaska/ ftp://tgftp.nws.noaa.gov/SL.us008001/ST.opnl/DF.gr2/DC.ndgd/GT.a q/AR.hawaii/ and displayed at http://airquality.weather.gov/ The scientific enhancements include the following:-- Improved wet removal by reducing in-cloud particle wet
removal coefficient, allowing wet removal to occur only when both precipitation and clouds are defined in the same grid cell, and turned off precipitation field spatial interpolation -- revised horizontal puff dispersion rate to be more consistent with particle dispersion -- set Kanthar-Clayson vertical mixing parameterization as default -- maximum plume rise limits relaxed -- fires pre-processer modified for daily emission cycling The model has been tested with these updates for all HYSPLIT applications at NCEP. Overall the results showed generally similar results, except for simulations of the wet deposition from the Fukushima nuclear power plant incident of 2011, in which significant improvements occurred. There are no changes to existing products or their contents. More details about the HYSPLIT are available at:http://www.ready.noaa.gov/HYSPLIT.php For questions regarding these updated predictions, please
contact:Ivanka Stajner
NOAA/NWS/OST Silver Spring, MD 20910 ivanka.stajner@xxxxxxxx 301 713 9001 x 185NWS National Technical Implementation Notices are online at: http://www.nws.noaa.gov/os/notif.htm $$
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