I have noticed that there are a big differences between the forecasting values of the years 2018-2019 against 2020 for 'total_precipitation_surface'.
var dataset = ee.ImageCollection('NOAA/GFS0P25')
.filter(ee.Filter.date('2019-01-03', '2019-01-04')) // mean 4~ 8 kg/m^2
.filter(ee.Filter.date('2020-01-03', '2020-01-04')) // mean 0.0004 kg/m^2!!!
var Pre_TPS= dataset.select('total_precipitation_surface');
Are there some factor that we need apply?