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Scientific Definition:
from Climate Prediction Center Climate Glossary
The Arctic Oscillation is a pattern in which atmospheric pressure at polar and middle latitudes fluctuates between negative...
The El Niño–Southern Oscillation affects the location of the jet stream, which alters rainfall patterns across the West, Midwest, the Southeast, and throughout the tropics. The shift in the jet...
scientific defintion from the Climate Prediction Center:
The positive phase of the NAO reflects below-normal heights and pressure across the high latitudes of the North Atlantic and above-normal...
"Blocking" is the result of a high pressure system persisting over an area for several days leading to a stagnation of weather patterns (see this description for more detail).
Affects of Blocking (...
From the National Climate Assessment:
The frost-free season length, defined as the period between the last occurrence of 32°F in the spring and the first occurrence of 32°F in the fall...