Key period (120-168hrs) and two large groups with the blocking holding and, importantly, the signal for a negatively tilted trough (as per 00Z EC) with lower heights into Iberia. Matt Hugo on Twitter: "Key period (120-168hrs) and two large groups with the blocking holding and, importantly, the signal for a negatively tilted trough (as per 00Z EC) with lower heights into Iberia. Interesting stuff...All eyes on 'you' GFS now!... https://t.co/sq9nzk3ltM" / Twitter