Confidence growing that a pattern change toward colder, weather is coming to the NEUS by end of Oct.— HowardManges (@HowardManges) October 18, 2019
Red line= ridge high pressure; warmer; Blue = trough; colder.
'Colder' air gets pinched south below 'warmth.'
GEFS, GEPS shown; EPS similar but not shown in tweet. pic.twitter.com/T0KiTw1MQ7