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.glmp/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 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

LHUAxx KMDL     10-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 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

LRUAxx KMDL     10-m gridded wind gust forecasts

LMUCxx KMDL     Gridded probability of ceiling height < 500 ft

                forecasts

LMUDxx KMDL     Gridded probability of ceiling height < 1000 ft

                forecasts

LMUFxx KMDL     Gridded probability of ceiling height ? 3000 ft

                forecasts

LNUCxx KMDL     Gridded probability of visibility < 1 mile

                forecasts

LNUExx KMDL     Gridded probability of visibility < 3 mile

                forecasts

LNUFxx KMDL     Gridded 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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