Larry Cosgrove shared a post: What a "Greenland block" means to you. See also: https://lnkd.in/gDgAvsT The weather pattern over North America during the next 5-6 weeks will likely be heavily influenced by a large blocking signature, a positive 500MB height anomaly commonly known as a Greenland Block. A symptom of a negative North Atlantic Oscillation, the persistent closed ridge complex can produce two noteworthy effects: 1) Keeping the incoming storm track suppressed toward lower latitudes in the USA, with strongest periods of disturbed weather off of the shoreline of the Mid-Atlantic and New England states and 2) enabling drainage of cold air from Canada into the lower 48 states. All of the numerical models have consistently shown ridging in the vicinity of Baffin Island/Greenland from the medium range (and in some cases) through the month of January. The analogs are also strongly favorable for this feature. If you look at forecast guidance, you see a trend of storms coming into the West Coast being diverted into Texas, then to Georgia, then slowing up along and off of the East Coast. It is a fairly classic scenario. The result? Heavier than normal precipitation in the eastern half of the U.S. Temperatures gradually trending below average after each storm.