Looks like we're in for a major synoptic pattern change over the next week or so. This morning's 12Z analysis from the ECMWF model at 500mb finds us with a nice zonal (east-west) pattern. There are a few minor shortwave troughs but nothing very large in scale.
previous blog posts, cut-off lows like this tend to stick around for a while. Because they are separated from the main jet stream winds, there's nothing to really force them to move along from west to east. So they usually just sit there. This low will hover around for just a few days though, before transitioning back to an open-wave trough by next Monday as seen here:
Another aspect of this cut-off low moving across the US this week into next is that it will open the door for colder air currently over Canada to sneak down into the US. Compare this morning's 12Z surface temperature analysis from the GFS: