Questions tagged [gfs]

Global Forecast System

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4
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0answers
26 views

How to download the GFS 2m Temperature data?

I am attempting to download the 2m temperature forecast from the GFS forecasts archived by AWS's open dataset archive. I am having some issues figuring out the feature name to search for in the file ...
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0answers
32 views

What is the best way to calculate anomaly of meteorological variables with the (GFS/GEFS) forecast

To calculate the anomaly of a variable (temperature, for example) I need the climatology (at least 30 years) of that variable. Which climatology data source should I use? Should I use the "...
2
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1answer
86 views

What CRS does GFS use?

I'm trying to reproject GRIB data from NOAA forecasts onto other data using Python and the pygrib and proj packages (among many others). What is the proper Proj string for GFS GRIBs? The projection ...
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0answers
13 views

Land Use grib2 Table 4.212 download?

The grib2 format has a field listed under table 4.212 giving the land use code. Does anyone know where I can download data containing this field?
1
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1answer
44 views

What is the “forecast hour of product”

The NCEP website describes the file naming format of the GFS forecast data. https://www.nco.ncep.noaa.gov/pmb/products/gfs/ What does "forecast hour of product" mean?
1
vote
1answer
25 views

Ice Water Content from GFS file

I am working my way through this paper: http://downloads.hindawi.com/journals/amete/2017/8707234.pdf Equations 10 and 11 require the ice water content. I can't find it in the GFS grib2 file ...
0
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0answers
19 views

3D data from GFS files

I am using GFS forecast files from here: https://www.ncdc.noaa.gov/data-access/model-data/model-datasets/global-forcast-system-gfs and processing them with cfgrib: https://github.com/ecmwf/cfgrib ...
3
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0answers
159 views

Difference between GDAS and GFS data

What is the exact difference between GFS 0.25 and GDAS 0.25 data which is available in http://nomads.ncep.noaa.gov/. And are the GFS 0.5 and 1 degree data available in the above url and here the same?...
4
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1answer
263 views

How averaging works in GFS model from NOAA?

We have downloaded grib2 files for GFS model from NOAA and extracted irradiance (Downwards shortwave radiation flux) data. Following is a sample output for cordinates at [52.0,4.0]: ...
2
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2answers
755 views

How do I convert a latitude/longitude coordinate to a NOAA GFS grid cell location?

Looking at this GFS http://nomads.ncep.noaa.gov:9090/dods/gfs_0p50/gfs20170707/gfs_0p50_12z.ascii?tmax2m[0:2][124:128][279:283] The range defined by the second and third set of brackets specify the ...
4
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1answer
125 views

ISA Model and GFS data

I have a newbie question... I always used the International Standard Atmosphere model whenever I needed to calculate the temperature in a given altitude. It always looked accurate to me... However,...
6
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1answer
2k views

What is the difference between GFS analysis and GFS forecast data?

gfsanl_3_20151201_0000_006 means that the analysis was made at 0000 UTC and is valid at 0600 UTC, doesn't it? But for how long, 3 hours? And what is the difference ...
5
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1answer
1k views

How to find Cloud cover data in GFS grib models

I've been looking for the cloud cover estimates provided in the NOAA GFS models. This page discusses all their weather products and one of the few I find that includes cloud cover data "Total Cloud ...
2
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1answer
370 views

upper air data(observation) and analysis step for GFS model

Global forecast systems(GFS) gives analysis and forecasts at different time steps. Their main source of input is upper air data which is recorded only twice in a day(observation comes at 00 and 12). ...
5
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0answers
607 views

Why did the GFS switch to hourly forecasts through hour 120?

About a month ago, the GFS was upgraded. Among other things (like making parallel GFS data available), the upgrade notice said: Include hourly forecasts out to 120 hr Now, this seemed ...
5
votes
1answer
278 views

What is the difference between the freezing level and 0C isotherm in NOAA's GFS?

I'm playing around with NOAA's GFS forecast data and I see that it contains both a "0C isotherm level" and a "Highest tropospheric freezing level". Could someone tell me the difference between these ...