This page has daily 12Z model output discussion as it comes in. Discussion updated Monday-Friday by 12:15p.
HEADLINE: WESTERN LAKES SNOW UP SLIGHTLY… SOUTH CENTRAL BRAZIL DRIER ON 12Z GFS…
North America: The 12z run is a little heavier with expected snow totals of 4-8″ from northeast Kansas across Iowa and southern Wisconsin and into northern Michigan in the next 48 hours. It continues to project a Monday-Tuesday frame for the subsequent snow chance, with bitterly cold air to follow into the eastern and central U.S.
South America: This run is notably drier across MGS and Sao Paolo than the previous several runs, trimming totals from the upcoming weekend rain chances. These reductions are credible, and we have been expecting QPF to decline as the event approaches. Otherwise no major changes with 3-5″ of rain from central Santa Fe south in Argentina through the rest of January.