How to get old data from noaa.gov?

[prick]

I tried to get March 2024 data from nomads.ncep.noaa.gov but got this message. How can I request for old data? Thanks

 

[prick]

This is what I used. I can get May 04, 2024 data, but not older ones.

https://nomads.ncep.noaa.gov/cgi-bin/filter_gfs_0p25.pl?file=gfs.t00z.pgrb2.0p25.f012&lev_0-0.1_m_below_ground=on&lev_0.1-0.4_m_below_ground=on&lev_0.4-1_m_below_ground=on&lev_1000_mb=on&lev_100_m_above_ground=on&lev_100_mb=on&lev_10_m_above_ground=on&lev_10_mb=on&lev_1-2_m_below_ground=on&lev_150_mb=on&lev_200_mb=on&lev_20_mb=on&lev_250_mb=on&lev_2_m_above_ground=on&lev_300_mb=on&lev_30-0_mb_above_ground=on&lev_30_mb=on&lev_350_mb=on&lev_400_mb=on&lev_450_mb=on&lev_500_mb=on&lev_50_mb=on&lev_550_mb=on&lev_600_mb=on&lev_650_mb=on&lev_700_mb=on&lev_70_mb=on&lev_750_mb=on&lev_800_mb=on&lev_80_m_above_ground=on&lev_850_mb=on&lev_900_mb=on&lev_925_mb=on&lev_950_mb=on&lev_975_mb=on&lev_mean_sea_level=on&lev_surface=on&var_ACPCP=on&var_APCP=on&var_DLWRF=on&var_DSWRF=on&var_HGT=on&var_LAND=on&var_PRES=on&var_PRMSL=on&var_RH=on&var_SOILW=on&var_TMP=on&var_TSOIL=on&var_UGRD=on&var_ULWRF=on&var_USWRF=on&var_VGRD=on&var_WEASD=on&subregion=&leftlon=-25&rightlon=50&toplat=65&bottomlat=20&dir=/gfs.20240504/00/atmos

 

[prick]

latest data downloaded from NOMADS at ncep.noaa.gov (only last month kept on this site)
GRIBFILE.AAA GRIBFILE.AAD GRIBFILE.AAG GRIBFILE.AAJ GRIBFILE.AAM GRIBFILE.AAP GRIBFILE.AAS GRIBFILE.AAV GRIBFILE.AAY GRIBFILE.ABB GRIBFILE.ABE GRIBFILE.ABH GRIBFILE.ABK GRIBFILE.ABN
GRIBFILE.AAB GRIBFILE.AAE GRIBFILE.AAH GRIBFILE.AAK GRIBFILE.AAN GRIBFILE.AAQ GRIBFILE.AAT GRIBFILE.AAW GRIBFILE.AAZ GRIBFILE.ABC GRIBFILE.ABF GRIBFILE.ABI GRIBFILE.ABL GRIBFILE.ABO
GRIBFILE.AAC GRIBFILE.AAF GRIBFILE.AAI GRIBFILE.AAL GRIBFILE.AAO GRIBFILE.AAR GRIBFILE.AAU GRIBFILE.AAX GRIBFILE.ABA GRIBFILE.ABD GRIBFILE.ABG GRIBFILE.ABJ GRIBFILE.ABM full_grib_file

data download from archive website (https://rda.ucar.edu/datasets/ds609.2/#)
20191101.nam.t00z.awip3d00.tm00.grib2 20191101.nam.t12z.awip3d00.tm00.grib2 20191102.nam.t00z.awip3d00.tm00.grib2 20191102.nam.t12z.awip3d00.tm00.grib2
20191101.nam.t06z.awip3d00.tm00.grib2 20191101.nam.t18z.awip3d00.tm00.grib2 20191102.nam.t06z.awip3d00.tm00.grib2 20191102.nam.t18z.awip3d00.tm00.grib2

Questions:
1. is the archive website a correct one to get old data?
2. how to convert .grib2 to the same format as those from NOMADS at ncep.noaa.gov because without conversion, WPS cannot process the file.

 

[William.Hatheway]

You'll have to go to the RDA NCAR database and get the data you need.

NCAR RDA Dataset d084001

NCAR RDA

rda.ucar.edu

 

[prick]

Thank you! I thought this is essentially the same website where I downloaded the data (https://rda.ucar.edu/datasets/ds609.2/#)?
I will still get .grib2 file. How do I convert from .grib2 file to Gribfile format that can be used by WPS?

 

[William.Hatheway]

Thank you! But this is essentially the same website where I downloaded the data and I will still get .grib2 file.
How do I convert from .grib2 file to Gribfile format that can be used by WPS?

Ungrib can handle grib2. I use it all the time for looking at past storms

 

[prick]

Can you please share the scripts you used to convert from grib2 to Gribfile in Ungrib? I couldn't get Gribfile.AAA, Gribfile.AAB,etc.... I must have missed these steps. Thanks

 

[William.Hatheway]

Here you go. This tutorial will walk you through the steps.

ARW Model Basics

Quick version is make sure the grib files are linked. Then ungrib using serial command ./ungrib.exe. then geogrid followed by metgrid.

Always double check your vtables for the data you are using.

Hope this helps

 

[prick]

Thank you very much! Looks like after I download the .grib2 files from the website, I need to run these two lines before running ungrid. Is that right?

 

[William.Hatheway]

Yes

 

[prick]

Thank you very much. It helps. The process works now. However, I still ran into an error. See blow:

Here are my two input files
'https://data.rda.ucar.edu/ds609.2/6hr_anal/2019/20191101.awip3d.anl.tar',
'https://data.rda.ucar.edu/ds609.2/6hr_anal/2019/20191102.awip3d.anl.tar',


And I ran into this error complaining about 11/02 21pm data missing. Please see attached log.

2024-05-05 15:00:49.358 --- ERROR: Data not found: 2019-11-02_21: :00.0000

I think it's unlikely the original data is missing from ucar. Is there anything wrong with my processing?

 

[William.Hatheway]

What is it you are trying to simulate?

Can you also attach your namelist files