Abstract
In mid-latitude regions, atmospheric blocking leads a strongly meandering jet pattern that remains in same place for several weeks, causing meteorological and hydrological extremes. Rossby (1950) and Armi (1989) proposed a theoretical approach for atmospheric blocking utilizing analogies between open channel flow and jet stream. Kitano and Yamada (2017) extended this theory to realistic atmosphere and showed a relationship between typical blocking flow and specific energy in jet stream. In this study, we analyzed several blocking episodes in 1989 winter using specific energy theory and found energetic signals over Japan and its surroundings before Pacific blocking occurances. This signals may contribute to prediction on blocking.
