*** 06/19 Update ***

	We filled in missing data for the 2023-2024 winter season.

	A new "Derived" folder is being added with calculated
	severe weather parameters

*** 03/13 Update ***

	The GraphCast archive is back but only dates back to 01/2022 to avoid
	overlapping with the model training and fine-tuning period.

	(Near) real time data is now flowing. We are still working out the
	timing of when the files will be available for each initialization


*** 02/18 Update ***

	A minor issue was found in the GraphCast implementation leading us to
	regenerate the GraphCast files.


*** 02/12 Update ***

	This is an archive of pure AI-based numerical weather prediction reforecasts.

	The current period of record is 09/30/20 through 09/30/23. Real-time output
	will be available soon. For real-time visualizations, visit:

	https://aiweather.cira.colostate.edu

	00 UTC and 12 UTC initializations are available for all three years.
	06 UTC and 18 UTC initializations are available for 2023 only.

	Models currently included are:
		1. FourCastNet v1
			* Code: https://github.com/NVlabs/FourCastNet
			* Reference: https://arxiv.org/abs/2202.11214
		2. FourCastNet v2-small
			* Reference https://arxiv.org/abs/2306.03838
		3. Pangu-Weather
			* Code: https://github.com/198808xc/Pangu-Weather
			* Reference: https://www.nature.com/articles/s41586-023-06185-3
		4. GraphCast Operational
			* Code: https://github.com/google-deepmind/graphcast
			* Reference: https://www.science.org/doi/10.1126/science.adi2336

	***Currently, all models are initializated with GFS initial conditions.***

	The directory structure is as follows:
		s3://noaa-oar-mlwp-data/MMMM_vNNN/YYYY/mmdd/MMMM_vNNN_III_YYYYmmddhh_fXXX_fYYY_ZZ.nc; where
		MMMM = Four character model code (FOUR, PANG, or GRAP)
		 NNN = Three digit version number (currently 100 or 200)
		YYYY = Four digit year
		  mm = Two digit month
		  dd = Two digit day
		 III = Three character initial condition system (GFS)
		  hh = Two digit initialization time (00, 06, 12, or 18)
		 XXX = Three digit first forecast hour of file (currently 000 for all files)
		 YYY = Three digit last forecast hour of file (currently 240 for all files)
		  ZZ = Two digit forecast step (currently 06 for all files)

	Variables available by model:
		* FourCastNet v1
			* 10-m u wind component
			* 10-m v wind component
			* 100-m u wind component
			* 100-m v wind component
			* 2-m temperature
			* Surface pressure
			* Mean sea level pressure
			* Total column integrated water vapor
			* Geopotential at 1000, 850, 500, 250, and 50 hPa
			* Temperature at 850, 500, and 250 hPa
			* U wind component at 1000, 850, 500, and 250 hPa
			* V wind component at 1000, 850, 500, and 250 hPa
			* Relative humidity at 850 and 500 hPa
		* FourCastNet v2-small
			* 10-m u wind component
			* 10-m v wind component
			* 100-m u wind component
			* 100-m v wind component
			* 2-m temperature
			* Surface pressure
			* Mean sea level pressure
			* Total column integrated water vapor
			* Geopotential at 1000, 925, 850, 700, 600, 500, 400, 300, 250, 200, 150, 100, and 50 hPa
			* Temperature at 1000, 925, 850, 700, 600, 500, 400, 300, 250, 200, 150, 100, and 50 hPa
			* U wind component at 1000, 925, 850, 700, 600, 500, 400, 300, 250, 200, 150, 100, and 50 hPa
			* V wind component at 1000, 925, 850, 700, 600, 500, 400, 300, 250, 200, 150, 100, and 50 hPa
			* Relative humidity at 1000, 925, 850, 700, 600, 500, 400, 300, 250, 200, 150, 100, and 50 hPa
		* Pangu-Weather
			* 10-m u wind component
			* 10-m v wind component
			* 2-m temperature
			* Mean sea level pressure
			* Geopotential at 1000, 925, 850, 700, 600, 500, 400, 300, 250, 200, 150, 100, and 50 hPa
			* Temperature at 1000, 925, 850, 700, 600, 500, 400, 300, 250, 200, 150, 100, and 50 hPa
			* U wind component at 1000, 925, 850, 700, 600, 500, 400, 300, 250, 200, 150, 100, and 50 hPa
			* V wind component at 1000, 925, 850, 700, 600, 500, 400, 300, 250, 200, 150, 100, and 50 hPa
			* Specific humidity at 1000, 925, 850, 700, 600, 500, 400, 300, 250, 200, 150, 100, and 50 hPa
		* GraphCast Operational
			* 10-m u wind component
			* 10-m v wind component
			* 2-m temperature
			* Mean sea level pressure
			* Geopotential at 1000, 925, 850, 700, 600, 500, 400, 300, 250, 200, 150, 100, and 50 hPa
			* Temperature at 1000, 925, 850, 700, 600, 500, 400, 300, 250, 200, 150, 100, and 50 hPa
			* U wind component at 1000, 925, 850, 700, 600, 500, 400, 300, 250, 200, 150, 100, and 50 hPa
			* V wind component at 1000, 925, 850, 700, 600, 500, 400, 300, 250, 200, 150, 100, and 50 hPa
			* Specific humidity at 1000, 925, 850, 700, 600, 500, 400, 300, 250, 200, 150, 100, and 50 hPa
			* Vertical velocity at 1000, 925, 850, 700, 600, 500, 400, 300, 250, 200, 150, 100, and 50 hPa
			* 6-hr accumulated precipitation

	Questions? Contact jacob.radford@noaa.gov

	Recommended Acknowledgment: We would like to thank Dr. Jacob Radford, the Cooperative Institute
			for Research in the Atmosphere, and NOAA Global Systems Laboratory for 
			producing and providing the AI models reforecast data archive.	 

	Our acknowledgments: We would like to thank the FourCastNet, Pangu-Weather, and GraphCast developers
			for make their code open access. We would also like to thank ECMWF for
			providing the ai-models package (https://github.com/ecmwf-lab/ai-models) which
			greatly simplifies running these models.

	Disclaimer: NOAA is providing this data "as is," and NOAA and its partners cannot be held responsible,
			nor assume any liability for any damages caused by inaccuracies in this data or documentation,
			or as a result of the failure of the data or software to function in a particular manner.
			NOAA and its partners make no warranty, expressed or implied, as to the accuracy, completeness,
			or utility of this information, nor does the fact of distribution constitute a warranty