This post will address the synoptic atmosphere from May 4th to May 20th.
Current state of the atmosphere is rather bizarre in my opinion, with the United States (henceforth abbreviated as CONUS) under a deep closed low centered in the Plains at this hour. This closed low attains a minimum pressure of over 1000 millibars, although that value is deceiving. Observed temperatures show 60 and 70-degree temperatures being thrown up across the Southeast and Ohio Valley on the eastern side of this storm system as it meanders in the Plains. Further to the north, massive high pressure acts as a barrier to protect Canada from this closed low and bring a stretch of rather quiet weather to the region. Greenland is under a solid storm system, indicating that the North Atlantic Oscillation (NAO) is in its positive (warm weather for the CONUS) phase. A lack of defined height anomalies across the Arctic doesn't help me as far as trying to figure out synoptic temperature trends over the next 48-72 hours. Dynamic situation set up in East Asia, as a strong storm system is going to battle with two ridges of high pressure. Bering Sea is void of any significant height anomalies, complicating the act of figuring out just what the atmosphere wants to do in the aspect of warm or cold temperature trends in coming days.