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NOUS41 KWBC 051747
PNSWSH

Technical Implementation Notice 16-13
National Weather Service Headquarters Washington DC
147 PM EDT Thu May 5 2016

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

From: Tim McClung
 Portfolio Manager
 Office of Science and Technology Integration

Subject: Changes to Gridded Localized Aviation Model
 Output Statistics Program (LAMP) Effective
 June 14, 2016

On or about Tuesday, June 14, 2016, beginning with the 1200
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 are as follows:

1.  Add seven new elements to LAMP gridded forecast guidance for
CONUS. Guidance will be available for the following new
elements:

 - 10-m wind gusts
 - Probability of ceiling height < 500 ft
 - Probability of ceiling height < 1000 ft
 - Probability of ceiling height ? 3000 ft
 - Probability of visibility < 1 mile
 - Probability of visibility < 3 miles
 - Probability of visibility < or equal to 5 miles

2. Add one new element to LAMP gridded observations for CONUS.
Gridded LAMP observations will be available for 10-m wind gusts.

3. Make minor algorithm changes and update station lists for
station input into Gridded LAMP are expected to provide slight
improvements to the Gridded LAMP observations and forecast
guidance for existing elements:

 - 2-m Temperature
 - 2-m Dewpoint temperature
 - Ceiling height
 - Visibility
 - Sky Cover
 - 10-m Wind speed
 - 10-m Wind direction

Specifically,

 - The criteria to reject input points have been modified
slightly.
 - The gridding algorithm for temperature and dewpoint now use
upper air data, which is expected to improve accuracy of the
Gridded LAMP temperature and dewpoint observations and forecasts
at higher elevations in the mountainous regions.
 - The gridding algorithm and smoothing have been modified
slightly and the station list has been updated for ceiling
height, visibility and sky cover.

Benefits of the system changes include:

 - Availability of Gridded LAMP gridded observations and
forecasts guidance for new element of 10-m wind gusts
 - Availability of Gridded LAMP gridded forecasts for new
elements of ceiling height probabilities and visibility
probabilities
 - Slight overall improvements in the gridded fields due to
additional data and minor algorithm modifications
 - Improved accuracy of Gridded LAMP temperature and dewpoint
observations and forecasts at higher elevations in the
mountainous regions
In addition, ceiling and visibility observations and forecasts
gridded data now better fit the underlying point data and reduce
the spread of very low ceiling and visibility values into areas
on the grid where there are no nearby station points.

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.g
lmp/AR.conus/
or
http://tgftp.nws.noaa.gov/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 is available at:

http://www.weather.gov/mdl/lamp_glmp_NWS_tgftp_server

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.weather.gov/media/mdl/glmpheaders_2016.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 HEADERELEMENT
------------------
LAUAxx KMDL2-meter gridded temperature observations
LAUBxx KMDL2-meter gridded temperature observation
error estimations
LBUAxx KMDL2-meter gridded dewpoint temperature
observations
LBUBxx KMDL2-meter gridded dewpoint temperature
observation error estimations
LCUAxx KMDLGridded ceiling height observations
LDUAxx KMDLGridded visibility observations
LEUAxx KMDLGridded opaque sky cover observations
LFUAxx KMDL10-m gridded wind speed observations
LGUAxx KMDL10-m gridded wind direction observations
LHUAxx KMDL10-m gridded wind gust 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 HEADERELEMENT
------------------
LKUAxx KMDLGridded 2-meter temperature forecasts
LLUAxx KMDLGridded 2-meter dewpoint temperature forecasts
LMUAxx KMDLGridded ceiling height forecasts
LNUAxx KMDLGridded visibility forecasts
LOUAxx KMDLGridded opaque sky cover forecasts
LPUAxx KMDL10-m gridded wind speed forecasts
LQUAxx KMDL10-m gridded wind direction forecasts
LRUAxx KMDL10-m gridded wind gust forecasts
LMUCxx KMDLGridded probability of ceiling height < 500 ft
forecasts
LMUDxx KMDLGridded probability of ceiling height < 1000 ft
forecasts
LMUFxx KMDLGridded probability of ceiling height ? 3000 ft
forecasts
LNUCxx KMDLGridded probability of visibility < 1 mile
forecasts
LNUExx KMDLGridded probability of visibility < 3 mile
forecasts
LNUFxx KMDLGridded probability of visibility < or equal to 5
mile
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.weather.gov/mdl/lamp_docs

A consistent parallel feed of data is available on the
NCEP HTTP.  The data are available at the following URL:

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

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.weather.gov/mdl/lamp_home

National Public Information Statements are online at:

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



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