A negative phase of the Pacific-North American (PNA) pattern is associated with:
A. Colder than normal temperatures in the Pacific Northwest
B. Wetter than normal conditions in the Pacific Northwest
C. Drier than normal conditions in the Pacific Northwest
D. Warmer than normal temperatures in the Pacific Northwest
Answer: Option A
Solution (By JKSSB Mock Tests)
A negative PNA phase is associated with colder than normal temperatures in the Pacific Northwest and warmer than normal temperatures in the southeastern United States, with a trough over western North America.
Explanation:
The North Atlantic Oscillation is a large-scale pattern of sea level pressure differences between the Azores (subtropical high) and Iceland (subpolar low).
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