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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 48 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 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
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
More Information | NCEP Mesoscale Branch | NCEP Model Analysis and Forecasts

NAM 40 km (pressure)

The NAM model contains forecast data every 3 hours from forecast hours 0 to 84 on a 40 km 185 x 129 grid covering the United States and Southern Canada. Domain map of NAM 40 km.

  • SURFACE FIELDS:
    • MSLP TMPS TPP3 CPP3 SOLT SOLW T02M RH2M U10M V10M P10M PRSS WESD CSNO CICE CFZR CRAI LHTF SHTF USTR VSBY RGHS LCLD MCLD HCLD TCLD DSWF WTMP CAPE CINH LISD LIB4
  • 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
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
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
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
More Information | NCEP Mesoscale Branch | NCEP Model Analysis and Forecasts

NAM Alaska 45 km (pressure)

The NAM model contains forecast data every 3 hours from forecast hours 0 to 36 on a 45 km 139 x 107 grid covering northwestern North America and eastern Russia. Domain map of NAM Alaska.

  • SURFACE FIELDS:
    • SHGT MSLP TPPT CPPT T02M RH2M U10M V10M PRSS LHTF SHTF USTR RGHS DSWF
  • 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
More Information | NCEP Mesoscale Branch | NCEP Model Analysis and Forecasts

RAP 20 km (pressure)

The RAP (formerly RUC) 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
More Information

GFS Model (pressure)

The Global Forecasting System or GFS (formerly called the Aviation Model) contains forecast data every 3 hours from forecast hours 0 to 192 on a 1 degree latitude/longitude grid 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
More Information | NCEP Model Analysis and Forecasts

GFS 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
More Information | NCEP Model Analysis and Forecasts