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000
NOUS41 KWBC 111156
PNSWSH

Technical Implementation Notice 16-02
National Weather Service Headquarters Washington DC
756 AM EST Thu Feb 11 2016

To:   Subscribers:
   -NOAA Weather Wire Service
   -Emergency Managers Weather Information Network
   -NOAAPORT
   Other NWS Partners, Users and Employees

From:   Timothy McClung
   Chief Operating Officer
   NWS Office of Science and Technology Integration

Subject:   Climatology Calibrated Precipitation Analysis
(CCPA)
   Changes: Effective March 22, 2016

On or about Tuesday, March 22, 2016, beginning with the 1200
Coordinated Universal Time (UTC) run, the Climatology Calibrated
Precipitation Analysis (CCPA) product will be updated.

The upgrade in the CCPA production suite will:

1. Update the regression coefficients with extended historical
training data sets of the National Centers for Environmental
Prediction (NCEP) Climate Prediction Center (CPC) Unified Global
Daily Gauge Analysis and the NCEP Environmental Modeling Center
(EMC) Stage IV 6-houly multi-sensor estimation from 2002 to
2015.

2. Change the computation of weights used in downscaling from
6-hourly CCPA to 3-hourly CCPA, by using Stage II to replace
Stage IV data in CNRFC where the latter has poor quality.

3. Extend the CCPA look-back period following the Stage IV
update schedule in 2015 implementation of the RTMA/URMA upgrade.
The job makes additional reruns at 1/3/5/7 days past the valid
date.

4. Add 2.5 km National Digital Guidance Database (NDGD) grid
output. This grid analysis is generated by interpolating from
the Hydrologic Rainfall Analysis Project (HRAP) grid to 2.5 km
NDGD grid. The 2.5 km NDGD CCPA covers the same domain as the
5km NDGD CCPA, and it is also available for both 3-hourly and
6-hourly accumulations.

Following the NCEP implementation standards, there will be
significant changes in CCPA product directory structure and
output file names.

Directory Changes:

CCPA files will be moved from the
gens/prod/gefs.YYYYMMDD/HH/ccpa directory structure to
ccpa/prod/ccpa.YYYYMMDD/HH

Files will be available on external servers in the following
directories:

NCEP NOMADS server:
http://nomads.ncep.noaa.gov/pub/data/nccf/com/ccpa/prod/ccpa.YYY
YMMDD/HH

NCEP FTP server:
http://www.ftp.ncep.noaa.gov/data/nccf/com/ccpa/prod/ccpa.YYYYMM
DD/HH
 or
ftp://ftp.ncep.noaa.gov/pub/data/nccf/com/ccpa/prod/ccpa.YYYYMMD
D/HH ,
where YYYYMMDD is the date and HH is the ending time (hour) of
the 6-hour accumulation period.


File Name Changes:

All existing files named ccpa_conus_GRID_tXXz_LLh_gb2 will be
replaced by ccpa.tXXz.LLh.GRID.conus.gb2, where GRID is the
spatial resolution, XX is the accumulation ending time, and LL
is the accumulation length.

There will be six files for each (XX,LL) pair corresponding to
the following six grids (GRID):
1. hrap: HRAP Grid (same as the Stage IV grid)
2. ndgd5p0: 5 km National Digital Forecast Database (NDFD)
  CONUS grid
3. ndgd2p5: 2.5 km National Digital Forecast Database (NDFD)
  CONUS grid
4. 0p125: 0.125 degree CONUS latitude/longitude grid (Grid
  ID 110)
5. 0p5: 0.5 degree latitude/longitude grid with data coverage
  over CONUS only
6. 1p0: 1.0 degree latitude/longitude grid with data coverage
  over CONUS only (Grid ID 3)

For specifications of Grid IDs 3 and 110, see

http://www.nco.ncep.noaa.gov/pmb/docs/on388/tableb.html

The timing of final data delivery will be delayed by this
implementation as some additional time will be needed to
generate the data at the 2.5km NDGD grid. The delay is expected
to be 7-8 minutes or less. Users are also advised to pay special
attention to additional updates with the extended look-back
periods: The rerun 1 day after the valid date may be delayed by
up to 7-8 minutes while the added updates 3/5/7 days after the
valid date will slightly improve the product accuracy.

A consistent parallel feed of both GEFS and NAEFS data will be
available on the NCEP server via the following URL:

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

Test data will be available at:
ftp://ftp.emc.ncep.noaa.gov/gc_wmb/yluo

More information regarding the CCPA and its scientific
implementation can be found at:
http://journals.ametsoc.org/doi/abs/10.1175/JHM-D-11-0140.1

http://www.emc.ncep.noaa.gov/gmb/ens/NAEFS-
5th/Session_3/Hou_precipitation_analysis.pdf

http://www.emc.ncep.noaa.gov/gmb/yzhu/imp/i201507/CCPA_upgrade_2
015.pdf


NCEP encourages all users to ensure their decoders are flexible
and are able to adequately handle changes in content order,
parameter fields changing 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 implementation.

For questions regarding these changes, please contact:

   Yan Luo
   NCEP/EMC Global Modeling Branch
   College Park, Maryland
   Phone:  301-683-3778
   Email:  Yan.Luo@noaa.gov

For questions regarding the dataflow aspects of this data set,
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.nws.noaa.gov/os/notif.htm





000
NOUS41 KWBC 111156
PNSWSH

Technical Implementation Notice 16-02
National Weather Service Headquarters Washington DC
756 AM EST Thu Feb 11 2016

To:   Subscribers:
   -NOAA Weather Wire Service
   -Emergency Managers Weather Information Network
   -NOAAPORT
   Other NWS Partners, Users and Employees

From:   Timothy McClung
   Chief Operating Officer
   NWS Office of Science and Technology Integration

Subject:   Climatology Calibrated Precipitation Analysis
(CCPA)
   Changes: Effective March 22, 2016

On or about Tuesday, March 22, 2016, beginning with the 1200
Coordinated Universal Time (UTC) run, the Climatology Calibrated
Precipitation Analysis (CCPA) product will be updated.

The upgrade in the CCPA production suite will:

1. Update the regression coefficients with extended historical
training data sets of the National Centers for Environmental
Prediction (NCEP) Climate Prediction Center (CPC) Unified Global
Daily Gauge Analysis and the NCEP Environmental Modeling Center
(EMC) Stage IV 6-houly multi-sensor estimation from 2002 to
2015.

2. Change the computation of weights used in downscaling from
6-hourly CCPA to 3-hourly CCPA, by using Stage II to replace
Stage IV data in CNRFC where the latter has poor quality.

3. Extend the CCPA look-back period following the Stage IV
update schedule in 2015 implementation of the RTMA/URMA upgrade.
The job makes additional reruns at 1/3/5/7 days past the valid
date.

4. Add 2.5 km National Digital Guidance Database (NDGD) grid
output. This grid analysis is generated by interpolating from
the Hydrologic Rainfall Analysis Project (HRAP) grid to 2.5 km
NDGD grid. The 2.5 km NDGD CCPA covers the same domain as the
5km NDGD CCPA, and it is also available for both 3-hourly and
6-hourly accumulations.

Following the NCEP implementation standards, there will be
significant changes in CCPA product directory structure and
output file names.

Directory Changes:

CCPA files will be moved from the
gens/prod/gefs.YYYYMMDD/HH/ccpa directory structure to
ccpa/prod/ccpa.YYYYMMDD/HH

Files will be available on external servers in the following
directories:

NCEP NOMADS server:
http://nomads.ncep.noaa.gov/pub/data/nccf/com/ccpa/prod/ccpa.YYY
YMMDD/HH

NCEP FTP server:
http://www.ftp.ncep.noaa.gov/data/nccf/com/ccpa/prod/ccpa.YYYYMM
DD/HH
 or
ftp://ftp.ncep.noaa.gov/pub/data/nccf/com/ccpa/prod/ccpa.YYYYMMD
D/HH ,
where YYYYMMDD is the date and HH is the ending time (hour) of
the 6-hour accumulation period.


File Name Changes:

All existing files named ccpa_conus_GRID_tXXz_LLh_gb2 will be
replaced by ccpa.tXXz.LLh.GRID.conus.gb2, where GRID is the
spatial resolution, XX is the accumulation ending time, and LL
is the accumulation length.

There will be six files for each (XX,LL) pair corresponding to
the following six grids (GRID):
1. hrap: HRAP Grid (same as the Stage IV grid)
2. ndgd5p0: 5 km National Digital Forecast Database (NDFD)
  CONUS grid
3. ndgd2p5: 2.5 km National Digital Forecast Database (NDFD)
  CONUS grid
4. 0p125: 0.125 degree CONUS latitude/longitude grid (Grid
  ID 110)
5. 0p5: 0.5 degree latitude/longitude grid with data coverage
  over CONUS only
6. 1p0: 1.0 degree latitude/longitude grid with data coverage
  over CONUS only (Grid ID 3)

For specifications of Grid IDs 3 and 110, see

http://www.nco.ncep.noaa.gov/pmb/docs/on388/tableb.html

The timing of final data delivery will be delayed by this
implementation as some additional time will be needed to
generate the data at the 2.5km NDGD grid. The delay is expected
to be 7-8 minutes or less. Users are also advised to pay special
attention to additional updates with the extended look-back
periods: The rerun 1 day after the valid date may be delayed by
up to 7-8 minutes while the added updates 3/5/7 days after the
valid date will slightly improve the product accuracy.

A consistent parallel feed of both GEFS and NAEFS data will be
available on the NCEP server via the following URL:

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

Test data will be available at:
ftp://ftp.emc.ncep.noaa.gov/gc_wmb/yluo

More information regarding the CCPA and its scientific
implementation can be found at:
http://journals.ametsoc.org/doi/abs/10.1175/JHM-D-11-0140.1

http://www.emc.ncep.noaa.gov/gmb/ens/NAEFS-
5th/Session_3/Hou_precipitation_analysis.pdf

http://www.emc.ncep.noaa.gov/gmb/yzhu/imp/i201507/CCPA_upgrade_2
015.pdf


NCEP encourages all users to ensure their decoders are flexible
and are able to adequately handle changes in content order,
parameter fields changing 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 implementation.

For questions regarding these changes, please contact:

   Yan Luo
   NCEP/EMC Global Modeling Branch
   College Park, Maryland
   Phone:  301-683-3778
   Email:  Yan.Luo@noaa.gov

For questions regarding the dataflow aspects of this data set,
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.nws.noaa.gov/os/notif.htm





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