HRRRv4 and RAPv5 were implemented this morning at NCEP, first upgrade in 2 years. HRRR now has better data assimilation (3km ens), better t-storms, snow, near-src winds, clouds. Now it runs out to 48h every 6h. Great work by @NOAA_ESRL, @NWS. More here - https://t.co/aVHiNmfvdy pic.twitter.com/c0KgQOaI8m

— Stan Benjamin (@SsbenjStan) December 2, 2020