only rendered in printing; ARL website banner
Air Resources Laboratory banner imageNOAA logo

READY logoGridded Forecast Meteorological Data

 

Many of the HYSPLIT-compatible forecast data files are now available directly from NOAA NCEP. The root ftp directory is located at: ftp://ftpprd.ncep.noaa.gov/pub/data/nccf/com/hysplit/prod/


NAM 12 km (pressure)

The NAM model contains pressure level forecast data every 3 hours from forecast hours 0 to 84 on a 12 km 614 x 428 grid covering the United States and Southern Canada. Domain map of NAM 12 km.

  • SURFACE FIELDS:
    • MSLP TPP3 CPP3 T02M RH2M U10M V10M PRSS LHTF SHTF USTR RGHS DSWF TMPS SOLT SOLW WESD CSNO CICE CFZR CFRAI VSBY TCLD CAPE CINH LISD LIB4 SHGT
  • UPPER-LEVEL FIELDS:
    • (1000 975 950 925 900 875 850 825 800 775 750 725 700 650 600 550 500 450 400 350 300 250 200 150 100 50)
    • UWND VWND HGTS TEMP WWND RELH TKEN
  • Filenames on FTP servers:
    • hysplit.tXXz.namf, where XX is the cycle
More Information | NCEP Mesoscale Branch | NCEP Model Analysis and Forecasts

NAM 12 km Tiles (sigma-pressure hybrid)

The NAM model tiles contain pressure-sigma hybrid level forecast data every hour from forecast hours 0 to 48 on a 12 km 201 x 146 grid covering 4 quadrants of the United States.

  • SURFACE FIELDS:
    • SHGT MSLP TPP3 T02M SOLM RH2M U10M V10M PRSS LHTF SHTF USTR RGHS DSWF PBLH TCLD LCLD MCLD HCLD
  • UPPER-LEVEL FIELDS: Note, these levels are pressure-sigma hybrid levels. The pressure level is defined as:

    P = A + B*PRSS,

    where PRSS is the surface pressure and A.B is defined as the level (ie., 16.9640 = 980 hPa when the surface pressure is 1000 hPa)
    • (1.0000 6.9883 10.9800 13.9720 16.9640 20.9560 24.9480 27.9390 31.9300 35.9210 39.9110 44.9020 48.8910 53.8800 58.8690 63.8570 69.8430 76.8270 83.8080 92.7870 103.7600 127.7100 157.6300 192.5500 231.4500)
    • TEMP UWND VWND WWND SPHU TKEN
  • Filenames on FTP servers:
    • hysplit.tXXz.namsf.NEtile, where XX is the cycle, and NE is Northeast U.S.
    • hysplit.tXXz.namsf.SEtile, where XX is the cycle, and SE is Southeast U.S.
    • hysplit.tXXz.namsf.NWtile, where XX is the cycle, and NW is Northwest U.S.
    • hysplit.tXXz.namsf.SWtile, where XX is the cycle, and SW is Southwest U.S.
More Information | NCEP Mesoscale Branch | NCEP Model Analysis and Forecasts

NAM Fire Weather Nest (sigma-pressure hybrid)

The NAM model 1 km nest for fire weather events contain pressure-sigma hybrid level forecast data every hour from forecast hours 0 to 36 on a 1 km 356 x 356 grid that can vary with each model run.
Current NAM Fire Weather Domains.

  • SURFACE FIELDS:
    • SHGT MSLP TPP1 T02M SOLM RH2M U10M V10M PRSS LHTF SHTF USTR RGHS DSWF PBLH TCLD LCLD MCLD HCLD
  • UPPER-LEVEL FIELDS: Note, these levels are pressure-sigma hybrid levels. The pressure level is defined as:

    P = A + B*PRSS,

    where PRSS is the surface pressure and A.B is defined as the level (ie., 16.9640 = 980 hPa when the surface pressure is 1000 hPa)
    • (1.0000 6.9883 10.9800 13.9720 16.9640 20.9560 24.9480 27.9390 31.9300 35.9210 39.9110 44.9020 48.8910 53.8800 58.8690 63.8570 69.8430 76.8270 83.8080 92.7870 103.7600 127.7100 157.6300 192.5500 231.4500 269.3600 307.2600 339.1600 361.0800 357.0200 315.0000 261.0000 217.0000 180.0000 149.0000 121.0000 94.0000 69.0000 44.0000 19.0000)
    • TEMP UWND VWND WWND SPHU TKEN
  • Filenames on FTP servers:
    • hysplit.tXXz.namsf.FW, where XX is the cycle
More Information | NCEP Mesoscale Branch | NCEP Model Analysis and Forecasts

NAM CONUS Nest (sigma-pressure hybrid)

The NAM model 4 km CONUS nest contains pressure-sigma hybrid level forecast data every hour from forecast hours 0 to 24 on a 4 km 1309 x 888 grid covering the United States. There are four files per cycle with each one containing 6 hours of forecast data.
Domain map of NAM CONUS Nest.

  • SURFACE FIELDS:
    • SHGT MSLP TPP3 T02M SOLM RH2M U10M V10M PRSS LHTF SHTF USTR RGHS DSWF PBLH TCLD LCLD MCLD HCLD
  • UPPER-LEVEL FIELDS: Note, these levels are pressure-sigma hybrid levels. The pressure level is defined as:

    P = A + B*PRSS,

    where PRSS is the surface pressure and A.B is defined as the level (ie., 16.9640 = 980 hPa when the surface pressure is 1000 hPa)
    • (1.0000 6.9883 10.9800 13.9720 16.9640 20.9560 24.9480 27.9390 31.9300 35.9210 39.9110 44.9020 48.8910 53.8800 58.8690 63.8570 69.8430 76.8270 83.8080 92.7870 103.7600 127.7100 157.6300 192.5500 231.4500 269.3600 307.2600 339.1600 361.0800 357.0200 315.0000 261.0000 217.0000 180.0000 149.0000 121.0000 94.0000 69.0000 44.0000 19.0000)
    • TEMP UWND VWND WWND SPHU TKEN
  • Filenames on FTP servers:
    • hysplit.tXXz.namsf00.CONUS, where XX is the cycle, contains hours 1 to 6
    • hysplit.tXXz.namsf06.CONUS, where XX is the cycle, contains hours 7 to 12
    • hysplit.tXXz.namsf12.CONUS, where XX is the cycle, contains hours 13 to 18
    • hysplit.tXXz.namsf18.CONUS, where XX is the cycle, contains hours 19 to 24
More Information | NCEP Mesoscale Branch | NCEP Model Analysis and Forecasts

NAM Hawaii ~2 km (sigma-pressure hybrid)

The NAM model Hawaii 2 km contain pressure-sigma hybrid level forecast data every hour from forecast hours 0 to 48 on a 2 km 312 x 307 grid covering the Hawaii region.
Domain map of NAM 2 km Hawaii grid.

  • SURFACE FIELDS:
    • SHGT MSLP TPP3 T02M SOLM RH2M U10M V10M PRSS LHTF SHTF USTR RGHS DSWF PBLH TCLD LCLD MCLD HCLD
  • UPPER-LEVEL FIELDS: Note, these levels are pressure-sigma hybrid levels. The pressure level is defined as:

    P = A + B*PRSS,

    where PRSS is the surface pressure and A.B is defined as the level (ie., 16.9640 = 980 hPa when the surface pressure is 1000 hPa)
    • (1.0000 6.9883 10.9800 13.9720 16.9640 20.9560 24.9480 27.9390 31.9300 35.9210 39.9110 44.9020 48.8910 53.8800 58.8690 63.8570 69.8430 76.8270 83.8080 92.7870 103.7600 127.7100 157.6300 192.5500 231.4500 269.3600 307.2600 339.1600 361.0800 357.0200 315.0000 261.0000 217.0000 180.0000 149.0000 121.0000 94.0000 69.0000 44.0000 19.0000)
    • TEMP UWND VWND WWND SPHU TKEN
  • Filenames on FTP servers:
    • hysplit.tXXz.namsf.HI, where XX is the cycle
More Information | NCEP Mesoscale Branch | NCEP Model Analysis and Forecasts

NAM Alaska 12 km (sigma-pressure hybrid)

The NAM model Alaska 12 km contain pressure-sigma hybrid level forecast data every hour from forecast hours 0 to 48 on a 12 km 326 x 326 grid covering the Alaska region.
Domain map of NAM 12 km Alaska grid.

  • SURFACE FIELDS:
    • SHGT MSLP TPP3 T02M SOLM RH2M U10M V10M PRSS LHTF SHTF USTR RGHS DSWF PBLH TCLD LCLD MCLD HCLD
  • UPPER-LEVEL FIELDS: Note, these levels are pressure-sigma hybrid levels. The pressure level is defined as:

    P = A + B*PRSS,

    where PRSS is the surface pressure and A.B is defined as the level (ie., 16.9640 = 980 hPa when the surface pressure is 1000 hPa)
    • (1.0000 6.9883 10.9800 13.9720 16.9640 20.9560 24.9480 27.9390 31.9300 35.9210 39.9110 44.9020 48.8910 53.8800 58.8690 63.8570 69.8430 76.8270 83.8080 92.7870 103.7600 127.7100 157.6300 192.5500 231.4500)
    • TEMP UWND VWND WWND SPHU TKEN
  • Filenames on FTP servers:
    • hysplit.tXXz.namsf.AK, where XX is the cycle
More Information | NCEP Mesoscale Branch | NCEP Model Analysis and Forecasts

RAP 20 km (pressure)

The Rapid Refressh (RAP) model contains forecast data every hour from forecast hours 0 to 18 on a 20 km 301 x 225 grid covering the United States and Southern Canada. Domain map for RAP 20 km.

  • SURFACE FIELDS:
    • PRSS MSLP SHGT TPP1 CPP1 T02M RH2M DP2M U10M V10M WESD SNWD CSNO CICE CFZR CRAI CAPE CINH LISD MXHT VSBY
  • UPPER-LEVEL FIELDS:
    • (1000 975 950 925 900 875 850 825 800 775 750 725 700 650 600 550 500 450 400 350 300 250 200 150 100)
    • UWND VWND HGTS TEMP WWND RELH
  • Filenames on FTP servers:
    • hysplit.tXXz.rapf, where XX is the cycle
More Information

GFS Model (1 degree, pressure)

The Global Forecasting System (GFS) one-degree latitude-longitude grid contains forecast data every 3 hours from forecast hours 0 to 192 covering the globe. The model data is updated 4 times per day.

  • SURFACE FIELDS:
    • PRSS MSLP TPP6 UMOF VMOF SHTF DSWF RH2M U10M V10M T02M TCLD
  • UPPER-LEVEL FIELDS:
    • (1000 975 950 925 900 850 800 750 700 650 600 550 500 450 400 350 300 250 200 150 100)
    • HGTS TEMP UWND VWND WWND RELH
    • (50 20)
    • HGTS TEMP UWND VWND
  • Filenames on FTP servers:
    • hysplit.tXXz.gfsf, where XX is the cycle
More Information | NCEP Model Analysis and Forecasts

GFS (Long Range) Model

The Global Forecasting System or GFSlr (we sometimes denote this very long forecast GFS dataset with lr) contains forecast data every 12 hours from forecast hours 192 to 384 on a 1.0 degree latitude/longitude grid covering the globe.

  • SURFACE FIELDS:
    • PRSS MSLP TPPT UMOF VMOF SHTF DSWF RH2M U10M V10M T02M TCLD
  • UPPER-LEVEL FIELDS:
    • (1000 975 950 925 900 850 800 750 700 650 600 550 500 450 400 350 300 250 200 150 100)
    • HGTS TEMP UWND VWND WWND RELH
    • (50 20)
    • HGTS TEMP UWND VWND
  • Filenames on FTP servers:
    • hysplit.tXXz.gfslrf, where XX is the cycle
More Information | NCEP Model Analysis and Forecasts

GFS (0.5 degree, sigma-pressure hybrid) Model

The Global Forecasting System (GFS) half-degree latitude-longitude grid contains sigma-pressure hybrid level forecast model output every 3 hours from forecast hours 0 to 84 covering the globe.

  • SURFACE FIELDS:
    • PRSS MSLE UMOF VMOF TPP6 SHTF DSWF SPH2 U10M V10M T02M TCLD PBLH LHTF USTR RGHS PTRO (PTRO-pressure of tropopause)
  • UPPER-LEVEL FIELDS: Note, these levels are pressure-sigma hybrid levels. The pressure level is defined as:

    P = A + B*PRSS,

    where PRSS is the surface pressure and A.B is defined as the level (ie., 16.9640 = 980 hPa when the surface pressure is 1000 hPa)
    • (1.0000 0.9999 0.9947 0.9886 0.9817 0.9739 1.9648 1.9544 2.9425 4.9288 6.9132 8.8954 11.8750 16.8530 21.8270 26.7990 33.7690 41.7350 49.6990 59.6600 69.6190 80.5760 91.5310 102.4900 113.4400 123.3900 133.3500 143.3000 151.2600 157.2200 162.1800 165.1500 166.1200 165.0900 162.0700 157.0500 150.0400 142.0200 132.0100 122.0100 111.0000 99.0020 88.0000 78.0000 68.0000 59.0000 52.0000 45.0000 39.0000 34.0000 29.0000 25.0000 21.0000 18.0000 15.0000 13.0000)
    • TEMP UWND VWND WWND SPHU PRES
    • Filenames on FTP servers:
      • hysplit.tXXz.gfs0p5f, where XX is the cycle
    More Information | NCEP Model Analysis and Forecasts
Modified: October 16, 2014
US Dept. of Commerce |  NOAA |  NOAA Research |  ARL