The next substantial threat for a winter storm in the E US comes between 1/18 - 1/21. Most ensemble guidance is in good agreement on the general synoptic signal. The disturbance, ridging into Alaska/Greenland & elongated PV are all features to closely monitor moving forward. pic.twitter.com/HIARxZLiC5

— John Homenuk (@jhomenuk) January 10, 2019