weather front – n. a boundary between two different air masses that results in stormy weather

jetstream – n. a strong current of fast winds high above the Earth's surface

pin – v. to prevent or stop (someone or something) from moving by holding or pressing firmly against something

variability – adj. able or likely to change or be changed : not always the same

phenomenal – adj. very good or great : unusual in a way that is very impressive

anomaly – n. something that is unusual or unexpected
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