Weather Glossary



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NAO Index This index measures the anomalies in sea level pressure between the Icelandic low pressure system ...
Negative-tilt Trough An upper level system which is tilted to the west with increasing latitude (i.e., with ...
Nimbostratus A cloud of the class characterized by a formless layer that is almost uniformly dark ...
Nocturnal Thunderstorms Thunderstorms which develop after sunset. They are often associated with the strengthening of the low ...
Nor'easter A strong low pressure system that affects the Mid Atlantic and New England States. It ...
North Atlantic Oscillation the NAO is a large-scale fluctuation in atmospheric pressure between the subtropical high pressure system ...
North Atlantic Oscillation (NOA) North Atlantic Oscillation - the NAO is a large-scale fluctuation in atmospheric pressure between the ...
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