NSSL CAMs -

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Realtime CAM Data

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CAM Verification

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1 Feb 2023: The FV3-NSSL runs concluded on 31 Jan 2023. Previous forecasts will remain available on the website in the "Discontinued" Section. The WRF-NSSL 3-km and WRF-NSSL 1-km runs are paused for the moment due to configuration changes/testing. We hope to resume these ASAP. NOTE: The FTP location used to disseminate the NSSL realtime runs has changed to ftp.nssl.noaa.gov/users/realtime. Please update your scripts to reflect this change. We apologize for any inconvenience.

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CAM daily run schedules

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Each CAM displayed on this site is run on a separate schedule. As of 1 April 2021, NSSL is currently only running CAMs initialized at 0000 UTC daily. The HRRR and RRFS CAMs provided by NCEP/EMC are run daily at 0000 and 1200 UTC out to 48 (beginning 12/01/22) and 60 hrs, respectively.

Model	0000/1200 UTC run
HRRR	Available ~0130/1330 UTC
RRFS-EMC	Available ~0230/1430 UTC
FV3-NSSL	Available ~1200 UTC
MPAS-HN-NSSL	Available ~1200 UTC
WRF-NSSL	Available ~0400 UTC
WRF-NSSL 3-km	Available ~1500 UTC
WRF-NSSL 1-km	Available ~1500 UTC

NOTE: after you switch models, the most recent run for the new model may not be displayed by default. The default behavior upon switching models is to use the same date and run you were viewing for the previous model, if available (or the closest run, if not available). If you wish to view the most recent run of the new model, check the calendar and the date dropdown menu to verify which runs are available.

FV3-NSSL now uses the FV3-LAM configuration

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The initial FV3-NSSL was implemented in the summer of 2018 as a global run with a refined nest covering the CONUS.

On 13 June 2019, the global configuration was replaced with the new FV3 limited-area model (LAM), which was developed by EMC in conjunction with NSSL, GSD, and GFDL. Preliminary tests performed during the 2019 NOAA Hazardous Weather Testbed Spring Forecasting Experiment found that the FV3 LAM's forecasts improved noticeably relative to the older global-with-nest configuration. This was likely due in part to the more advanced physics that were also implemented at the same time (see below).

The current FV3 LAM runs over a CONUS domain and inherits initial and lateral boundary conditions from the operational GFS, much like NSSL's WRF runs. This reduces the computational expense, compared to the original global-with-nest configuration. As a result, the FV3-NSSL should now typically be available by about 7-8 hours after the initialization time.

From 13 June 2019 to 26 April 2021, the FV3-NSSL used Thompson microphysics and MYNN PBL parameterizations via the Common Community Physics Package (CCPP). On 27 April 2021, the FV3-NSSL's microphysics was changed from the Thompson scheme to NSSL two-moment scheme.