RRFS Analysis Data Archive Revised: 5 October 2026 ________________________________________________________________________________ Access - The RRFS archive may be accessed by a ftp client or by a web browser: 1) If you want to use a ftp client, Windows PC users may use WinSCP, FileZilla, etc. that support passive mode. MacOS and Linux users may use the ftp command. Connect your ftp client to ftp.arl.noaa.gov using anonymous and your email address for the username and password, respectively and change directory to /archives/rrfs. Note if you are using multiple ftp connections, limit the number of concurrent connections equal to or less than two. Otherwise, your access to our ftp server may be blocked off. 2) If you are using a web browser, point it to https://www.ready.noaa.gov/data/archives/rrfs OR https://noaa-oar-arl-hysplit-pds.s3.amazonaws.com/index.html#rrfs/ It may take a few minutes or longer for the webpage to display. ________________________________________________________________________________ Overview - NOAA ARL has been archiving RRFS data since September 2026. An extraction procedure was implemented to concatenate the initial field (+0 h forecast) and each +1 h forecast for each cycle, four times daily, into six-hourly or daily files that can be accessed as a pseudo analysis archive. There are 4 domains: CONUS (3 km, sigma-pressure hybrid), Alaska (3 km, pressure), Hawaii (2.5 km, sigma-pressure hybrid), and Puerto Rico (2.5 km, sigma-pressure hybrid). YYYYMMDD_00-05_rrfs.CONUS - containing CONUS data from 00 - 05z YYYYMMDD_06-11_rrfs.CONUS - containing CONUS data from 06 - 11z YYYYMMDD_12-17_rrfs.CONUS - containing CONUS data from 12 - 17z YYYYMMDD_18-23_rrfs.CONUS - containing CONUS data from 18 - 23z YYYYMMDD_00-05_rrfs.AK - containing Alaska data from 00 - 05z YYYYMMDD_06-11_rrfs.AK - containing Alaska data from 06 - 11z YYYYMMDD_12-17_rrfs.AK - containing Alaska data from 12 - 17z YYYYMMDD_18-23_rrfs.AK - containing Alaska data from 18 - 23z YYYYMMDD_rrfs.HI - daily Hawaii data from 00 - 23z YYYYMMDD_rrfs.PR - daily Puerto Rico data from 00 - 23z ________________________________________________________________________________ Additional Data Set Details CONUS: 3.000 km lambert conformal grid 1799 x 1059 points Spatial domain: 21.14N 122.72W 47.84N 60.92W 66 Levels (sigma-pressure hybrid): 1.0000 .99890 .99670 .99410 .99120 .98800 .98430 .98020 .97560 .97040 .96460 .95810 .95090 1.9418 1.9327 2.9217 3.9096 5.8953 7.8798 9.8629 11.845 14.824 18.801 22.776 26.749 31.721 37.689 42.657 49.622 55.587 62.549 69.511 76.472 82.434 89.395 95.357 101.32 106.28 111.25 115.21 117.18 119.15 120.13 120.10 119.08 117.06 114.05 109.04 104.02 98.015 90.010 82.005 74.002 65.001 57.000 49.000 41.001 35.000 29.001 24.000 19.001 15.001 12.000 8.0007 5.0009 3.0003 Sfc Variables: 16 SHGT TPP1 T02M RH2M U10M V10M PRSS LHTF SHTF USTR RGHS DSWF PBLH TCLD CAPE SOLM Upper Levels: 8 PRES TEMP UWND VWND DZDT SPHU HGTS TKEN MODEL TYPE: RRFS VERT COORD: 4 POLE LAT: 90.000 POLE LON: 0.000 REF LAT: 38.500 REF LON: 262.500 REF GRID: 3.0 ORIENTATION: 0. CONE ANGLE: 38.5 SYNC X: 1. SYNC Y: 1. SYNC LAT: 21.1381 SYNC LON: 237.281 NUMB X: 1799 NUMB Y: 1059 NUMB LEVELS: 66 Alaska: 3.000 km lambert conformal grid 1649 x 1105 Spatial domain: 40.53N 178.57W 63.98N -93.71W 45 Levels (hPa): 1000 975 950 925 900 875 850 825 800 775 750 725 700 675 650 625 600 575 550 525 500 475 450 425 400 375 350 325 300 275 250 225 200 175 150 125 100 700 50 30 20 10 7 5 2 Sfc Variables: 16 SHGT TPP1 T02M RH2M U10M V10M PRSS LHTF SHTF USTR RGHS DSWF PBLH TCLD CAPE SOLM Upper Levels: 6 TEMP UWND VWND DZDT SPHU HGTS MODEL TYPE: RRFS VERT COORD: 2 POLE LAT: 90.000 POLE LON: 0.000 REF LAT: 60.000 REF LON: 210.000 REF GRID: 3.0 ORIENTATION: 0. CONE ANGLE: 90.0 SYNC X: 1. SYNC Y: 1. SYNC LAT: 40.5300 SYNC LON: 181.429 NUMB X: 1649 NUMB Y: 1105 NUMB LEVELS: 46 Hawaii: 2.500 km lambert conformal grid 321 x 225 points Spatial domain: 18.07N 161.53W 23.09N 153.87W 66 Levels (sigma-pressure hybrid): 1.0000 .99890 .99670 .99410 .99120 .98800 .98430 .98020 .97560 .97040 .96460 .95810 .95090 1.9418 1.9327 2.9217 3.9096 5.8953 7.8798 9.8629 11.845 14.824 18.801 22.776 26.749 31.721 37.689 42.657 49.622 55.587 62.549 69.511 76.472 82.434 89.395 95.357 101.32 106.28 111.25 115.21 117.18 119.15 120.13 120.10 119.08 117.06 114.05 109.04 104.02 98.015 90.010 82.005 74.002 65.001 57.000 49.000 41.001 35.000 29.001 24.000 19.001 15.001 12.000 8.0007 5.0009 3.0003 Sfc Variables: 16 SHGT TPP1 T02M RH2M U10M V10M PRSS LHTF SHTF USTR RGHS DSWF PBLH TCLD CAPE SOLM Upper Levels: 8 PRES TEMP UWND VWND DZDT SPHU HGTS TKEN MODEL TYPE: RRFS VERT COORD: 4 POLE LAT: 90.000 POLE LON: 0.000 REF LAT: 20.000 REF LON: 0.000 REF GRID: 2.5 ORIENTATION: 0. CONE ANGLE: 0. SYNC X: 1. SYNC Y: 1. SYNC LAT: 18.0727 SYNC LON: 198.475 NUMB X: 321 NUMB Y: 225 NUMB LEVELS: 66 Puerto Rico: 2.500 km lambert conformal grid 544 x 310 points Spatial domain: 15.00N 75.50W 22.00N 62.51W 66 Levels (sigma-pressure hybrid): 1.0000 .99890 .99670 .99410 .99120 .98800 .98430 .98020 .97560 .97040 .96460 .95810 .95090 1.9418 1.9327 2.9217 3.9096 5.8953 7.8798 9.8629 11.845 14.824 18.801 22.776 26.749 31.721 37.689 42.657 49.622 55.587 62.549 69.511 76.472 82.434 89.395 95.357 101.32 106.28 111.25 115.21 117.18 119.15 120.13 120.10 119.08 117.06 114.05 109.04 104.02 98.015 90.010 82.005 74.002 65.001 57.000 49.000 41.001 35.000 29.001 24.000 19.001 15.001 12.000 8.0007 5.0009 3.0003 Sfc Variables: 16 SHGT TPP1 T02M RH2M U10M V10M PRSS LHTF SHTF USTR RGHS DSWF PBLH TCLD CAPE SOLM Upper Levels: 8 PRES TEMP UWND VWND DZDT SPHU HGTS TKEN MODEL TYPE: RRFS VERT COORD: 4 POLE LAT: 90.000 POLE LON: 0.000 REF LAT: 20.000 REF LON: 0.000 REF GRID: 2.5 ORIENTATION: 0. CONE ANGLE: 0. SYNC X: 1. SYNC Y: 1. SYNC LAT: 15.0000 SYNC LON: 284.500 NUMB X: 544 NUMB Y: 310 NUMB LEVELS: 66