NOUS41 KWBC 081812



Technical Implementation Notice 15-58

National Weather Service Headquarters Washington DC

212 PM EST Tue Dec 8, 2015. 


To:       Subscribers:

          -Family of Services

          -NOAA Weather Wire Service

          -Emergency Managers Weather Information Network


          Other NWS Partners, Users and Employees


From:     Timothy McClung

          Portfolio Manager

          Office of Science and Technology Integration


Subject:  Ozone Air Quality Prediction Update Effective

          January 26, 2016


Effective on or about Tuesday, January 26, 2016, beginning with

the 1200 Coordinated Universal Time (UTC) run, the National

Centers for Environmental Prediction (NCEP) will upgrade the 

Air Quality Model (AQM) capability that uses the Community 

Multi-scale Air Quality (CMAQ) modeling system to provide ozone

air quality predictions.


The scope of this upgrade includes:


- Providing fine particulate matter (PM2.5) model predictions

- Making analog ensemble bias correction for fine particulate

  matter (PM2.5) forecast guidance

- Increasing the number of CMAQ vertical levels from 22 to 35

- Contributing dust-related aerosol species at the CMAQ

  lateral boundaries using the NEMS Global Aerosol Capability

  (NGAC) forecasts

- Incorporating file name standardization changes


The expected impact of these changes include:

- First public distribution of PM2.5 products

- Improved raw and bias corrected fine particulate matter

  (PM2.5) products

- Slight improvement in surface ozone predictions


Predictions from the updated CMAQ model will be made available

through a parallel feed at the following locations starting

November 2015.


1. Output Changes:  


The file names will change as follows on the NCEP servers:



    aqm.tCCz.1ho3-max.227.grib2 -> aqm.tCCz.max_1hr_o3.227.grib2

    aqm.tCCz.8ho3-max.227.grib2 -> aqm.tCCz.max_8hr_o3.227.grib2

    aqm.tCCz.1hro3.227.grib2    -> aqm.tCCz.ave_1hr_o3.227.grib2

    aqm.tCCz.8hro3.227.grib2    -> aqm.tCCz.ave_8hr_o3.227.grib2


    aqm.tCCz.8ho3.196.grib2     -> aqm.tCCz.ave_1hr_o3.196.grib2

    aqm.tCCz.1ho3.196.grib2     -> aqm.tCCz.ave_8hr_o3.196.grib2

    aqm.tCCz.8ho3-max.196.grib2 -> aqm.tCCz.max_8hr_o3.196.grib2

    aqm.tCCz.1ho3-max.196.grib2 -> aqm.tCCz.max.1hr_o3.196.grib2


    aqm.tCCz.8ho3.198.grib2     -> aqm.tCCz.ave_8hr_o3.198.grib2

    aqm.tCCz.1ho3.198.grib2     -> aqm.tCCz.ave_1hr_o3.198.grib2

    aqm.tCCz.8ho3-max.198.grib2 -> aqm.tCCz.max_8hr_o3.198.grib2

    aqm.tCCz.1ho3-max.198.grib2 -> aqm.tCCz.max_1hr_o3.198.grib2


*Where CC is the cycle time


Files under the NCEP Gateway (former TOC) servers will remain



Web graphics will remain available at:


2. New Products:


The new raw PM2.5 products will be distributed to the NCEP

http/ftp servers for CONUS, Alaska and Hawaii. The new bias

corrected PM2.5 will be distributed for CONUS.










*Where FF is forecast hour 01-48


The new PM2.5 maps and products will be publicly available from

the NCEP EMC web site below and NCEP directories. Posting of PM

maps at will follow at a later date.


The hourly and daily maximum ozone and PM maps are available at


For questions regarding these updated model forecast guidance,

please contact:


 Ivanka Stajner


 Silver Spring, MD 20910



For questions regarding the data flow, please contact:


 Carissa Klemmer

 NCEP Central Operations Dataflow Team

 College Park, MD



NWS National Technical Implementation Notices are online at: