Notification of Removal of NGM-LAMP

 

LAMP Announcement

December 07, 2006

Updated: January 23, 2007

 

Attention LAMP users:

The LAMP system, which provides an update to the MOS guidance, is being redeveloped to update the GFS MOS guidance instead of updating the older NGM MOS guidance. The initial four cycles of the GFS-MOS based LAMP (GFS-LAMP) guidance became operational in July 2006. Beginning in 2007, the GFS-LAMP will provide operational guidance for as many (and eventually more) cycles as the NGM-MOS based LAMP (NGM-LAMP), and the NGM-LAMP will no longer be necessary.

Beginning with the OB8.1 release of AWIPS, we expect that there will be at least as many cycles of the GFS-LAMP guidance as the NGM-LAMP guidance. At that time, the NGM-LAMP system will be removed from AWIPS according to the approved OB8.1 content of the System Recommendation & Evaluation Committee (SREC). With the AWIPS OB8.1 release, the NGM-LAMP guidance will no longer be available, and the NGM-LAMP software will no longer run locally at CONUS WFOs in AWIPS. The product will be discontinued.

In response to the discontinuation of the NGM-LAMP in AWIPS, on or around November 1, 2007 the NGM-LAMP guidance will cease to be available on the NWS LAMP web site https://www.weather.gov/mdl/lamp_ngmlamp.

Users are encouraged to prepare for the discontinuation of the NGM-LAMP well in advance of this time. The new GFS-LAMP guidance is currently available, and will continue to be available after the removal of the NGM-LAMP, and is intended to be used as a replacement for the NGM-LAMP. Information about the GFS-LAMP, including the real-time GFS-LAMP guidance, is available at the web site https://www.weather.gov/mdl/lamp_home.

For your reference, key differences between the NGM-based LAMP system and the GFS-based LAMP system are summarized below. Please note that the GFS LAMP does not currently provide guidance for either Quantitative Precipitation Forecasts (QPF) or Cloud Layer Amounts and Heights for 3 layers of clouds. It is possible that these elements may be developed in the future for GFS LAMP. The new GFS LAMP will provide guidance for categorical Ceiling Height and Total Sky Cover.

Category

Current (NGM-based) LAMP

New (GFS-based) LAMP

Updates

NGM MOS

GFS MOS

Runs

Locally in AWIPS

Centrally on NCEP computers

Distribution

Within AWIPS, NWS ftp server, experimentally on web

Across NOAAport, SBN, NWS ftp server, experimentally on web, National Digital Guidance Database, received in AWIPS and at NWS National Centers

Cycles

Every 3 hours

Every hour (planned)

Projections

Hourly out 20 hours

Hourly out 25 hours

Coverage

CONUS

CONUS, Alaska, Hawaii, Puerto Rico (Thunderstorm guidance available over CONUS only)

Stations

~ 1000 stations

> 1500-1600 Stations (depending on the cycle)

 

Key differences between the NGM-based LAMP forecast elements and the GFS-based LAMP forecast elements are summarized below:

Element

Current (NGM-based) LAMP

New (GFS -based) LAMP

Temperature

Yes

Yes

Dewpoint

Yes

Yes

Wind Direction

Yes

Yes

Wind Speed

Yes

Yes

Wind Gusts

No

Yes

Probability of Precipitation Occurring on the Hour

Yes

Yes

Best Category (yes/no) for Occurrence of precipitation on the Hour

Yes

Yes

Probability of Precipitation Occurring in a 6-h period

Yes

Yes

Probability of Precipitation Occurring in a 12-h period

Yes

Yes

Probability of Thunderstorm Occurring in a 20-km gridbox in a 2-h period

No

Yes

Best Category (yes/no) for Occurrence of thunderstorm in a 20-km gridbox in a 2-h period

No

Yes

Precipitation Type

Yes

Yes

Precipitation Characteristics

No

Yes

Sky Cover

Yes

Yes

Ceiling Height

Yes

Yes

Conditional Ceiling Height

No

Yes

Visibility

Yes

Yes

Conditional Visibility

No

Yes

Obstruction to Vision

Yes

Yes

Quantitative Precipitation Forecast

Yes

Not Planned

Three Cloud Layers

Yes

Not Planned

For more details about the new system, please visit our web site https://www.weather.gov/mdl/lamp_about.

Thank you for your interest in LAMP.

Judy Ghirardelli

NWS/OST/MDL/LAMP