I'm struggling to see which charts posters are looking at who are saying "the Atlantic is waking up". If there's one thing that seems to characterise the model output for several days now, it is a quiet Atlantic. Albeit that any troughs that are around tend to want to sit around the UK.
The 12Z GFS for example has another mid-Atlantic ridge at 168hrs transferring to a Scandi high by 240hrs and then retrogressing to a fully plumped up Greenland High by 360hrs. Hardly the stuff of a roaring Atlantic jet.
Likewise the overnight ECM has heights rising over Iceland and Greenland by 240, and even the UKMO out to 144 seems to show heights building north. So I'm a bit 
Originally Posted by: Rob K