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PNSWSH

 

Technical Implementation Notice 16-03

National Weather Service Headquarters Washington DC

315 PM EST Fri Mar 4 2016

 

To:       Subscribers:

          -NOAA Weather Wire Service

          -Emergency Managers Weather Information Network

          -NOAAPORT

          Other NWS Partners, Users and Employees

 

From:     Tim McClung

          Portfolio Manager

          NWS Office of Science and Technology Integration

 

Subject:  Amended: Addition of GEFS/NAEFS Bias Corrected

          Products and Downscaled Products for Alaska and CONUS:

          Effective March 29, 2016

 

Amended to change the implementation date from Tuesday, March

22, 2016 to Tuesday, March 29, 2016

 

Effective on or about Tuesday, March 29, 2016, beginning with

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

Centers for Environmental Prediction (NCEP) will upgrade the

Global Ensemble Forecast System (GEFS) and the North American

Ensemble Forecast System (NAEFS). The upgrade will include:

 

-Adding one variable to bias-corrected products 1 degree

globally from GEFS 

-Increasing resolution of downscaled probabilistic products

for CONUS (from 5km to 2.5km) and Alaska (from 6km to 3km)

for GEFS and NAEFS

-Extending the CONUS domain to cover southern part of Canada

following the extended NDGD

-Upgrading FNMOC ensemble. Variable Total Cloud Cover will

use percentage (%) instead of fraction (0-1)

-Directly distributing FNMOC’s bias corrected forecast

instead of NCEP produced bias corrected forecast

 

All filenames given below can be located on the NCEP servers at:

 

ftp://ftp.ncep.noaa.gov/pub/data/nccf/com/gens/prod/

 

http://www.ftp.ncep.noaa.gov/data/nccf/com/gens/prod

 

http://nomads.ncep.noaa.gov/pub/data/nccf/com/gens/prod

 

 

Addition of a New Variable

 

1. Adding the following one bias-corrected element:

Total cloud cover (TCDC) 

 

   Ensemble products with the one new variable listed include:

NCEP bias-corrected GEFS forecast for each member

GEFS filenames pgrb2a_bc/gep##

NCEP bias-corrected GFS forecast

GEFS filenames pgrb2a_bc/gegfs

 

Changes in File Names

 

The file names in the ndgd_gb2 sub-directory will be different

from those in current production 

 

1. File names for GEFS and NAEFS CONUS products (where ### is

000-384) 

 

10% probability forecast

GEFS filenames

ndgd_gb2/gefs.tCCz.ge10pt.f###.conus_ext_2p5.grib2

NAEFS filenames

ndgd_gb2/naefs.tCCz.ge10pt.f###.conus_ext_2p5.grib2

50% probability forecast

GEFS filenames

ndgd_gb2/gefs.tCCz.ge50pt.f###.conus_ext_2p5.grib2

NAEFS filenames

ndgd_gb2/naefs.tCCz.ge50pt.f###.conus_ext_2p5.grib2

 

90% probability forecast

GEFS filenames

ndgd_gb2/gefs.tCCz.ge90pt.f###.conus_ext_2p5.grib2

NAEFS filenames

ndgd_gb2/naefs.tCCz.ge90pt.f###.conus_ext_2p5.grib2

 

Ensemble mean forecast

GEFS filenames

ndgd_gb2/gefs.tCCz.geavg.f###.conus_ext_2p5.grib2

NAEFS filenames

ndgd_gb2/naefs.tCCz.geavg.f###.conus_ext_2p5.grib2

 

Ensemble mode forecast 

GEFS filenames

ndgd_gb2/gefs.tCCz.gemode.f###.conus_ext_2p5.grib2

NAEFS filenames

ndgd_gb2/naefs.tCCz.gemode.f###.conus_ext_2p5.grib2

 

Ensemble spread forecast

GEFS filenames

ndgd_gb2/gefs.tCCz.gespr.f###.conus_ext_2p5.grib2

NAEFS filenames

ndgd_gb2/naefs.tCCz.gespr.f###.conus_ext_2p5.grib2

 

2. File names for GEFS and NAEFS Alaska products:

     

10% probability forecast

GEFS filenames

ndgd_gb2/gefs.tCCz.ge10pt.f###.alaska_3p0.grib2

NAEFS filenames

ndgd_gb2/naefs.tCCz.ge10pt.f###.alaska_3p0.grib2

 

 

50% probability forecast

GEFS filenames

ndgd_gb2/gefs.tCCz.ge50pt.f###.alaska_3p0.grib2

NAEFS filenames

ndgd_gb2/naefs.tCCz.ge50pt.f###.alaska_3p0.grib2

 

90% probability forecast

GEFS filenames

ndgd_gb2/gefs.tCCz.ge90pt.f###.alaska_3p0.grib2

NAEFS filenames

ndgd_gb2/naefs.tCCz.ge90pt.f###.alaska_3p0.grib2

 

Ensemble mean forecast

GEFS filenames

ndgd_gb2/gefs.tCCz.geavg.f###.alaska_3p0.grib2

NAEFS filenames

ndgd_gb2/naefs.tCCz.geavg.f###.alaska_3p0.grib2

 

Ensemble mode forecast 

GEFS filenames

ndgd_gb2/gefs.tCCz.gemode.f###.alaska_3p0.grib2

NAEFS filenames

ndgd_gb2/naefs.tCCz.gemode.f###.alaska_3p0.grib2

 

Ensemble spread forecast

GEFS filenames

ndgd_gb2/gefs.tCCz.gespr.f###.alaska_3p0.grib2

NAEFS filenames

ndgd_gb2/naefs.tCCz.gespr.f###.alaska_3p0.grib2

 

Upgrade of FNMOC Raw and Bias Corrected Ensemble:

 

1. Upgrade the following one element:

     Total cloud cover(TCDC): use percentage(%)instead of

fraction (0-1)

 

   Ensemble products with the one upgraded variables listed

include:

FNMOC raw ensemble forecast for each member

      FNMOC filenames pgrb2a/ENSEMBLE.MET.fcst_et###

 

2. Changing file names for FNMOC bias corrected products 

      FNMOC bias corrected forecast for each member

      FNMOC filenames pgrb2a_bc/ENSEMBLE.MET.fcst_bc0###

 

3. GRIB2 packing change for FNMOC bias corrected products 

      Maximum Temperature and Minimum Temperature: Parameters

      for discipline in temperature category are updated to WMO

      standard                                                        

 

4. Add two new variables for FNMOC bias corrected products 

      2-meter dew point temperature

      Upward long wave radiation flux (OLR) at the top of the

      atmosphere

 

 

A consistent parallel feed of both GEFS and NAEFS data will be

available on the NCEP server via the following URLs:

 

http://para.nomads.ncep.noaa.gov/pub/data/nccf/com/gens/para

 

NCEP encourages all users to ensure their decoders are flexible

and are able to adequately handle changes in content order,

changes in the scaling factor component within the product

definition section (PDS) of the GRIB files, and also any volume

changes which may be forthcoming. These elements may change with

future NCEP model implementations. NCEP will make every attempt

to alert users to these changes prior to any implementations.

 

For questions regarding these changes, please contact:

 

      Yuejian Zhu

      NCEP/EMC Global Modeling Branch

      College Park, Maryland

      Phone: 301-683-3709

      Email: Yuejian.Zhu@noaa.gov

 

For questions regarding the dataflow aspects of these data sets,

please contact:

 

        Justin Cooke

        NCEP/NCO Dataflow Team

        College Park, Maryland

        Phone:  301-683-0567

        Email:  ncep.list.pmb-dataflow@noaa.gov

 

NWS National Technical Implementation Notices are online at:

 

     http://www.weather.gov/os/notif.htm

 

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