NOUS41 KWBC 311856

PNSWSH

 

Technical Implementation Notice 15-41

National Weather Service Headquarters Washington DC

0300 PM EDT Mon Aug 31 2015

 

To:       Subscribers:

          -Family of Services

          -NOAA Weather Wire Service

          -Emergency Managers Weather Information Network

          -NOAAPORT

          Other NWS Partners, Users and Employees

 

From:     Tim McClung

          Chief Operating Officer

          Office of Science and Technology Integration

 

Subject:  Changes to Gridded Localized Aviation Model Output

          Statistics Program (LAMP) Effective October 1, 2015

 

On or about Wednesday, October 1, 2015, beginning with the 1400

Coordinated Universal Time (UTC) model run, the NWS

Meteorological Development Laboratory (MDL) will implement

changes to the Gridded Localized Aviation Model Output Statistics

Program (LAMP).

 

Gridded LAMP products are generated on a 2.5-km Lambert Conformal

grid over the CONUS.  Gridded observations and gridded forecasts

(1 to 25 hour projections) are produced hourly.  These products

are disseminated on the Satellite Broadcast Network (SBN),

NOAAPORT, and are available in the operational National Digital

Guidance Database (NDGD). 

 

The changes will include:

 

1.  Add three new elements to LAMP gridded observations and

forecast guidance for CONUS. Guidance will be available for the

following new elements:

 

   - Opaque sky cover

   - 10-m wind speed

   - 10-m wind direction

 

2.  Improve gridded LAMP observations and forecast guidance for

existing elements:

 

   - 2-m temperature

   - 2-m dewpoint temperature

   - Ceiling height

   - Visibility

 

3.  Increase the number of LAMP forecast points which are input

into the Gridded LAMP analyses for ceiling height and visibility

forecast guidance, and increase the number of observations which

are input into the Gridded LAMP analyses of temperature and

dewpoint observations.

 

4.  Replace SREF data with observations and MOS data for

augmentation of Gridded LAMP temperature and dewpoint forecast

guidance grids. 

 

Benefits of the system changes include:

 

   - Availability of Gridded LAMP guidance for new elements of

     opaque sky cover, 10-m wind speed, and 10-m wind direction.

   - Improved ceiling height and visibility forecast guidance due

     to additional LAMP forecast inputs and modified analysis

     scheme.

   - Improved temperature and dewpoint observation and forecast

     grids due to augmentation with observations and MOS data.

   - Better temporal consistency between the observation grids

     and the 1-h forecast grids for all elements, as well as

     between every forecast projection for temperature, dewpoint,

     and wind grids.

   - Improved system robustness in case of missing observations.

 

The gridded LAMP products for the CONUS, in GRIB2 format, are

available on the NWS server at:

 

ftp://tgftp.nws.noaa.gov/SL.us008001/ST.opnl/DF.gr2/DC.ndgd/GT.glmp/AR.conus/

 

or

 

http://weather.noaa.gov/pub/SL.us008001/ST.opnl/DF.gr2/DC.ndgd/GT.glmp/AR.conus/

 

 

A listing of the GRIB2 file names for gridded observations and

forecasts for new and existing elements are available at:

 

http://www.nws.noaa.gov/mdl/gfslamp/docs/glmp_NWS_tgftp_server.php

 

The new communication identifiers for the GRIB2 products are

shown below in Tables 1 and 2.  A complete list of GLMP WMO

headers is available at

 

   http://www.nws.noaa.gov/mdl/gfslamp/docs/glmpheaders_2015.pdf

 

Table 1:  Communication identifiers for the Gridded LAMP

observation products in GRIB2 format.  Listed below are

representations of the WMO header. xx represents the valid UTC

hour (00-23).

 

WMO HEADER      ELEMENT

-----------     -------

LAUAxx KMDL     2-meter gridded temperature observations

LAUBxx KMDL     2-meter gridded temperature observation

                error estimations

LBUAxx KMDL     2-meter gridded dewpoint temperature

                observations

LBUBxx KMDL     2-meter gridded dewpoint temperature

                observation error estimations

LCUAxx KMDL     Gridded ceiling height observations

LDUAxx KMDL     Gridded visibility observations

LEUAxx KMDL     Gridded opaque sky cover observations

LFUAxx KMDL     10-m gridded wind speed observations

LGUAxx KMDL     10-m gridded wind direction observations

 

Table 2:  Communication identifiers for the Gridded LAMP forecast

products in GRIB2 format. Listed below are representations of the

WMO header.  xx represents the forecast projections (01-25).

 

WMO HEADER      ELEMENT

-----------     -------

LKUAxx KMDL     Gridded 2-meter temperature forecasts

LLUAxx KMDL     Gridded 2-meter dewpoint temperature forecasts

LMUAxx KMDL     Gridded ceiling height forecasts

LNUAxx KMDL     Gridded visibility forecasts

LOUAxx KMDL     Gridded opaque sky cover forecasts

LPUAxx KMDL     10-m gridded wind speed forecasts

LQUAxx KMDL     10-m gridded wind direction forecasts

 

More details about the Gridded LAMP products and this

implementation, including a link to a website for displaying the

new and improved products, can be found online at:

 

   http://www.nws.noaa.gov/mdl/gfslamp/docs/glmpinfo.php

 

A consistent parallel feed of data will be made available on the

NCEP HTTP server once the model is running in parallel on the

NCEP Weather and Climate Operational Supercomputing System

(WCOSS).  The data will be available at the following URL:

 

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

 

If you have technical comments or questions, please contact:

 

Judy Ghirardelli

National Weather Service

Meteorological Development Laboratory

Judy.Ghirardelli@noaa.gov

301-427-9496

 

Links to the LAMP products and descriptions can found at:

 

   http://www.nws.noaa.gov/mdl/gfslamp/gfslamp.shtml

 

National Technical Implementation Notices are online at:

 

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

 

$$