Psalm 148:8
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Did global models at one time only only ingest new data at 12 and 00?? Maybe that is what I’m remembering.Only hires cams run from previous global runs (ie 18z HRRR/RAP initializes with 12z GFS forecast, nudged towards observations made at 18z with data assimilation).. Global models are fresh runs at each 18z, 00z, 06z, 12z.
And the most recent run is considered the most accurate. Any inter-run differences in accuracy due to 'off-run' data availability are far exceeded by gains in accuracy as you reduce lead-time.
this is what I’m remembering..i think the perception of the 00z and 12z being of higher mettle is because this is when balloons get launched and that data is ingested