Information regarding LAMP and Gridded LAMP Data on NCEP Web Services


The GFS-LAMP guidance is currently available every hour.

The GFS LAMP station guidance is available in the following formats: ASCII text bulletin and BUFR format. The Gridded LAMP guidance is available in GRIB2 format. 

The guidance is available on the LAMP web site https://www.weather.gov/mdl/lamp_home. The GFS LAMP products are also available via NCEP web services. The details for retrieving the data from NCEP web services can be found in the tables below.

For details regarding the ASCII text product see https://www.weather.gov/mdl/lamp_desc.

For details regarding the BUFR product see https://www.weather.gov/mdl/lamp_Bufrintro05.

For details regarding the Gridded LAMP convection and lightning guidance GRIB2 products see https://www.weather.gov/mdl/lamp_cnvltg_grib2.
 

For details regarding the Gridded LAMP guidance for the following elements:

  • 2-meter temperature observations and the associated error estimations
  • 2-meter dewpoint temperature observations and the associated error estimations
  • Ceiling height observations
  • Visibility observations
  • 2-meter temperature forecast guidance
  • 2-meter dewpoint temperature forecast guidance
  • Ceiling height forecast guidance
  • Ceiling height probability forecast guidance 
  • Visibility forecast guidance
  • Visibility forecast probability guidance 
  • 10-m Wind Speed
  • 10-m Wind Direction
  • 10-m Wind Gusts 
  • Opaque Sky Cover
  • 1-h Probability of Precipitation (>= 0.01”)
  • 1-h Y/N Occurrence of Precipitation (>=0.01”)

see https://www.weather.gov/mdl/lamp_glmpgrib2.

 

GFS LAMP Products available on NCEP Web Services

(Effective on or about March 22, 2021)

Data Type

NCEP server location

ASCII Text Bulletin (1-25 hours) Web Access:
https://ftp.ncep.noaa.gov/data/nccf/com/lmp/prod/lmp.YYYYMMDD
https://nomads.ncep.noaa.gov/pub/data/nccf/com/lmp/prod/lmp.YYYYMMDD
Filename:
lmp_lavtxt.tHH30z (HH=cycle)

ASCII Extended Text Bulletin (26-38 hours)
Web Access:
https://ftp.ncep.noaa.gov/data/nccf/com/lmp/prod/lmp.YYYYMMDD
https://nomads.ncep.noaa.gov/pub/data/nccf/com/lmp/prod/lmp.YYYYMMDD
Filename:
lmp_lavtxt_ext.tHH30z  (HH=cycle)
ASCII 15-min Update Text Bulletin (1-3 hours) Web Access:
https://ftp.ncep.noaa.gov/data/nccf/com/lmp/prod/lmp.YYYYMMDD
https://nomads.ncep.noaa.gov/pub/data/nccf/com/lmp/prod/lmp.YYYYMMDD
Filename:
lmp_lavtxt.tHHMMz (HHMM=nominal run time, MM=00, 15, 45)
ASCII Text Bulletin for 76 remote Alaska stations (1-25 hours) Web Access:
https://ftp.ncep.noaa.gov/data/nccf/com/lmp/prod/lmp.YYYYMMDD
https://nomads.ncep.noaa.gov/pub/data/nccf/com/lmp/prod/lmp.YYYYMMDD
Filename:
lmp_lavtxt_ak.tHH30z (HH=cycle time)
ASCII Extended Text Bulletin for 76 remote Alaska stations (26-38 hours) Web Access:
https://ftp.ncep.noaa.gov/data/nccf/com/lmp/prod/lmp.YYYYMMDD
https://nomads.ncep.noaa.gov/pub/data/nccf/com/lmp/prod/lmp.YYYYMMDD
Filename:
lmp_lavtxt_ext_ak.tHH30z (HH=cycle time)
BUFR Web Access:
https://ftp.ncep.noaa.gov/data/nccf/com/lmp/prod/lmp.YYYYMMDD
https://nomads.ncep.noaa.gov/pub/data/nccf/com/lmp/prod/lmp.YYYYMMDD
Filename:
lmp_bufrmsg.xtrn.tHH30z (HH=cycle)
LAMP 1-h Convection Probability & Potential (on trimmed NDFD CONUS grid) Web Access:
https://ftp.ncep.noaa.gov/data/nccf/com/lmp/prod/lmp.YYYYMMDD
https://nomads.ncep.noaa.gov/pub/data/nccf/com/lmp/prod/lmp.YYYYMMDD
Filename:
lmp_1h_cnv_prbgrib2_2p5km.tHH30z (Convection Probability, HH=cycle)
lmp_1h_cnv_potgrib2_2p5km.tHH30z (Convection Potential, HH=cycle)
LAMP 1-h Lightning Probability & Potential (on trimmed NDFD CONUS grid) Web Access:
https://ftp.ncep.noaa.gov/data/nccf/com/lmp/prod/lmp.YYYYMMDD
https://nomads.ncep.noaa.gov/pub/data/nccf/com/lmp/prod/lmp.YYYYMMDD
Filename:
lmp_1h_ltg_prbgrib2_2p5km.tHH30z (Lightning Probability, HH=cycle)
lmp_1h_ltg_potgrib2_2p5km.tHH30z (Lightning Potential, HH=cycle)
LAMP 2-h Convection Probability & Potential (on trimmed NDFD CONUS grid) Web Access:
https://ftp.ncep.noaa.gov/data/nccf/com/lmp/prod/lmp.YYYYMMDD
https://nomads.ncep.noaa.gov/pub/data/nccf/com/lmp/prod/lmp.YYYYMMDD
Filename:
lmp_cnv_prbgrib2_2p5km.tHH30z (Convection Probability, HH=cycle)
lmp_cnv_potgrib2_2p5km.tHH30z (Convection Potential, HH=cycle)
LAMP 2-h Lightning Probability & Potential (on trimmed NDFD CONUS grid) Web Access:
https://ftp.ncep.noaa.gov/data/nccf/com/lmp/prod/lmp.YYYYMMDD
https://nomads.ncep.noaa.gov/pub/data/nccf/com/lmp/prod/lmp.YYYYMMDD
Filename:
lmp_ltg_prbgrib2_2p5km.tHH30z (Lightning Probability, HH=cycle)
lmp_ltg_potgrib2_2p5km.tHH30z (Lightning Potential, HH=cycle)
Gridded LAMP Observations in GRIB2 (on trimmed NDFD CONUS grid) Web Access:
https://ftp.ncep.noaa.gov/data/nccf/com/glmp/prod/glmp.YYYYMMDD
https://nomads.ncep.noaa.gov/pub/data/nccf/com/glmp/prod/glmp.YYYYMMDD
Filenames (HH=cycle):
glmp_hr00_cig.co.gb2.g.tHH30z (Ceiling Height 0-hr ob)
glmp_hr00_sky.co.gb2.g.tHH30z (Sky Cover 0-hr ob)
glmp_hr00_t.co.gb2.g.tHH30z (2-m Temperature 0-hr ob)
glmp_hr00_td.co.gb2.g.tHH30z (2-m Dewpoint 0-hr ob)
glmp_hr00_tee.co.gb2.g.tHH30z (2-m Temperature Error Estimate)
glmp_hr00_tdee.co.gb2.g.tHH30z (2-m Dewpoint Error Estimate)
glmp_hr00_vis.co.gb2.g.tHH30z (Visibility 0-hr ob)
glmp_hr00_wdir.co.gb2.g.tHH30z (Wind Direction 0-hr ob)
glmp_hr00_wgst.co.gb2.g.tHH30z (Wind Gust 0-hr ob)
glmp_hr00_wspd.co.gb2.g.tHH30z (Wind Speed 0-hr ob)
Gridded LAMP Forecasts in GRIB2 (on trimmed NDFD CONUS grid) Web Access:
https://ftp.ncep.noaa.gov/data/nccf/com/glmp/prod/glmp.YYYYMMDD
https://nomads.ncep.noaa.gov/pub/data/nccf/com/glmp/prod/glmp.YYYYMMDD
Filenames (HH=cycle):
glmp_fcst_cig.co.gb2.g.tHH30z (Ceiling Height Forecast)
glmp_fcst_cigp2.co.gb2.g.tHH30z (Forecast Prob Ceiling Height < 500 feet)
glmp_fcst_cigp3.co.gb2.g.tHH30z (Forecast Prob Ceiling Height < 1000 feet)
glmp_fcst_cigp5.co.gb2.g.tHH30z (Forecast Prob Ceiling Height <= 3000 feet)
glmp_fcst_sky.co.gb2.g.tHH30z (Sky Cover Forecast)
glmp_fcst_t.co.gb2.g.tHH30z (2-m Temperature Forecast)
glmp_fcst_td.co.gb2.g.tHH30z (2-m Dewpoint Forecast)
glmp_fcst_vis.co.gb2.g.tHH30z (Visibility Forecast)
glmp_fcst_visp2.co.gb2.g.tHH30z (Forecast Prob Vis < 1 mile)
glmp_fcst_visp4.co.gb2.g.tHH30z (Forecast Prob Vis < 3 miles)
glmp_fcst_visp5.co.gb2.g.tHH30z (Forecast Prob Vis <= 5 miles)
glmp_fcst_wdir.co.gb2.g.tHH30z (Wind Direction Forecast)
glmp_fcst_wgst.co.gb2.g.tHH30z (Wind Gust Forecast)
glmp_fcst_wspd.co.gb2.g.tHH30z (Wind Speed Forecast)
Gridded LAMP Observations in GRIB2 (Ceiling Height, Visibility, and Sky Cover on expanded NBM CONUS grid)* Web Access:
https://ftp.ncep.noaa.gov/data/nccf/com/glmp/prod/glmp.YYYYMMDD
https://nomads.ncep.noaa.gov/pub/data/nccf/com/glmp/prod/glmp.YYYYMMDD
Filename:
glmp.tHH30z.master.f000.co.grib2 (HH=cycle)
Gridded LAMP Observations in GRIB2 (Ceiling Height and Visibility on NBM Alaska grid) Web Access:
https://ftp.ncep.noaa.gov/data/nccf/com/glmp/prod/glmp.YYYYMMDD
https://nomads.ncep.noaa.gov/pub/data/nccf/com/glmp/prod/glmp.YYYYMMDD
Filename:
glmp.tHH30z.master.f000.ak.grib2 (HH=cycle)
Gridded LAMP Forecasts in GRIB2 (Ceiling height, visibility, sky cover, 1-h PoP, and 1-h precip Y/N on expanded NBM CONUS grid)* Web Access:
https://ftp.ncep.noaa.gov/data/nccf/com/glmp/prod/glmp.YYYYMMDD
https://nomads.ncep.noaa.gov/pub/data/nccf/com/glmp/prod/glmp.YYYYMMDD
Filename:
glmp.tHH30z.master.fPPP.co.grib2 (HH=cycle, PPP=forecast projection, 001-038)
Gridded LAMP Forecasts in GRIB2 (Ceiling height, visibility, 1-h convection, and 1-h lightning on NBM Alaska grid) Web Access:
https://ftp.ncep.noaa.gov/data/nccf/com/glmp/prod/glmp.YYYYMMDD
https://nomads.ncep.noaa.gov/pub/data/nccf/com/glmp/prod/glmp.YYYYMMDD
Filename:
glmp.tHH30z.master.fPPP.ak.grib2 (HH=cycle, PPP=forecast projection, 001-038)

*Note that the GLMP ceiling height and visibility GRIB2 data on the NOMADS cover the full CONUS domain through 17 hours, and the covering is clipped to the CONUS, Canada, and near-shore waters beyond 17 hours due to a lack of skill in the Atlantic and Pacific Oceans and the Gulf of Mexico at those projections.

 

Notes about the data

Gridded Element Units Special Values
Gridded Forecasts of Convection and Lightning Probabilities Percent None
Gridded Forecasts of Convection and Lightning Potential Coded Code:
  • 0 = No
  • 4=Low 
  • 6=Medium
  • 8=High
Gridded Obs and Fcsts of Ceiling Height Meters Value of -1 in GRIB2 represent EITHER an unlimited ceiling, or a ceiling > 12,000 feet
Gridded Obs, Fcsts, and Error Estimates of Temperature, Dewpoint Degrees Kelvin None
Gridded Obs and Fcsts of Ceiling Height Meters Value of -1 in GRIB2 represent EITHER an unlimited ceiling, or a ceiling > 12,000 feet
Fcsts of Probability of Ceiling Height
< 500 feet, < 1000 feet, ≤ 3000 feet
Percent None
Gridded Obs and Fcsts of Visibility Meters None
Fcsts of Probability of Visibility
< 1 mile, < 3 miles, ≤ 5
Percent None
Gridded Obs and Fcsts of Wind Speed and Wind Gusts m/s None
Gridded Obs and Fcsts of Wind Direction 10's of Degrees None
Gridded Obs and Fcsts of Opaque Sky Cover Percent None
Gridded Forecasts of 1-h Probability of Precipitation (>= 0.01”) Percent None
Gridded Forecasts of 1-h Y/N Occurrence of Measurable Precipitation (>=0.01”) Coded Code:
  • 0 = No
  • 1=Yes

 

For more information, please refer to the LAMP documentation page.