A 12-day GFS forecast for 10 hPa temperature and height valid 18Z 30 Dec (issued 00Z 18 Dec), vs. the verifying analysis. Awesome accuracy!

"The impact of numerical weather prediction is among the greatest of any area of physical science." https://t.co/ZOOzLGusZe pic.twitter.com/gQlN3utgpH

— Dr Simon Lee (@SimonLeeWx) December 31, 2020