Another big development is the return of the negative NAO which dominated during the extraordinary cold period in December and January. High pressure near NE Canada blocks the eastward progress of weather systems and sends them on a southerly detour. Notice how the blocking high is expected to develop at the same time that NC and VA will be heating up! The heat streams northward as part of the High Pressure building process which results in lower pressure, colder temperatures, and potential stormy weather in the places which were most recently warm.
|NAO is once again predicted to go negative|
Source: NOAA Climatic Prediction Center