From 13Z 19 Feb 2018 to 12Z 21 Feb 2018, the NLDAS-2 hourly operational forcing "A" datasets had zero precipitation over all of CONUS and Mexico. This error was a result of undefined values sent over from the operational CPC daily gauge analysis. Note that the 12Z 19 Feb 2018 field does have correct precipitation; the first incorrect hourly time is on 13Z 19 Feb, which represents the accumulated precipitation from 12Z to 13Z. These two days happened to be when heavy rains fell over the central U.S., centered around Illinois. On 12 June 2018, these 48 hourly files were replaced on the NASA GES DISC archive. The February 2018 monthly-averaged forcing "A" file was also replaced. Note that the NLDAS-2 LSMs are not corrected, and still reflect the zero precipitation from these two days in February 2018. For details about this issue, please see the "NLDAS issues FAQ/answer".
The NOAA/EMC and NASA/GSFC NLDAS teams have published a white paper, which describes the vision, requirements, implementation, and tentative schedules for all LDAS systems at NCEP. This white paper includes details of the next phases of NLDAS, including a truly real-time NLDAS-2.5 as well as a significantly upgraded NLDAS Phase 3.
A LIS blog post was recently published describing the new QuickDRI drought index. NLDAS-2 monthly soil moisture anomalies are one of the inputs to this weekly operational drought index.
Please follow the @NASA_LIS Twitter feed. NASA's LIS (Land Information System) software framework is used for the LDAS datasets at NASA/GSFC. The LIS Twitter feed will be used to announce new and updated NLDAS and other LDAS products as well as stories/studies using LIS-based LDAS datasets.
A set of variables from the NLDAS and GLDAS projects are now available as time series. These "data rods" datasets allow the access of the data in a long time series at a single point - without having to download the entire files. Access to the time series data is very quick, and is available as a plot or in ASCII format. A prototype to get the data in netCDF format is also available for testing. Please see the Data Rods News Article as well as documentation and how to access the Data Rods data.
NCEP implemented the NLDAS-2 system into NCEP Central Operations (NCO) on 5 Aug 2014. The NLDAS-2 products are available in GRIB-2 format. Operational users are encouraged to use the NCEP/NCO GRIB-2 products. GRIB-1 products, including near real-time updates and a complete archive, will continue to be available at the NASA Hydrology DISC. Note that these GRIB-1 updated products are only available in the NASA GES DISC format. NCEP's NLDAS ftp server has a new address - ftp://ldas.ncep.noaa.gov/nldas2/ - and will serve as an archive of the NCEP/NCO GRIB-2 operational products. More information about this significant milestone, including the transition of research to operations (R2O), please see this Science Highlight.
The Hydrology DISC portal enables access to hourly, monthly, and monthly climatology NLDAS datasets via http, GDS, Mirador, and Giovanni. Users can also perform subsetting and analysis operations without first downloading the data. Phase 1 forcing, Phase 2 primary and secondary forcing, Phase 2 Mosaic, Phase 2 Noah, and Phase 2 VIC datasets are available. See the NLDAS-1 README and NLDAS-2 README files for details about the creation and content of these datasets, as well as the FAQ.
Users of NLDAS datasets are encouraged to join the LDAS mailing list for updates on new data releases, new data services, data reprocessing, and data delays or outages.
Numerous NLDAS Phase 2 articles have been recently published; please check the NLDAS publications page.