Interesting side-by-side here because at first glance, 2002 and 2018 seem similar. Look closer. The C Pac forcing influencing the wave train over N. America in 2002 is absent in 2018. The eastern hemisphere is very similar, indicative of weaker Walker and high AAM: pic.twitter.com/DAGuHthpLN

— Anthony Masiello (@antmasiello) October 23, 2018