A positive phase of the Pacific-North American (PNA) pattern is associated with:
A. Colder than normal temperatures in the Pacific Northwest
B. Warmer than normal temperatures in the Pacific Northwest
C. Drier than normal conditions in the Pacific Northwest
D. Wetter than normal conditions in the southwestern United States
Answer: Option B
Solution (By JKExamLibrary)
A positive PNA phase is associated with warmer than normal temperatures in the Pacific Northwest and colder than normal temperatures in the southeastern United States, with a ridge over western North America.
Explanation:
Loo is a strong, hot, dry wind that blows over the northern plains of India during summer, especially in Rajasthan, Uttar Pradesh, and Bihar.
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