---
cited_by: []
definition: |-
  The PNA pattern is one of the most prominent modes of low-frequency
  variability in the Northern Hemisphere extratropics, appearing in all
  months except June and July. The PNA pattern reflects a quadripole
  pattern of height anomalies, with anomalies of similar sign located
  south of the Aleutian Islands and over the southeastern United
  States. Anomalies with sign opposite to the Aleutian center are
  located in the vicinity of Hawaii, and over the intermountain region
  of North America (central Canada) during the Winter and Fall (Spring).
href: https://data.globalchange.gov/gcmd_keyword/0e53e397-7836-45ec-bc62-0d54f9f176e5.yaml
identifier: 0e53e397-7836-45ec-bc62-0d54f9f176e5
label: PACIFIC/NORTH AMERICAN (PNA) PATTERN
parent_identifier: b887d3e5-4280-43d2-a34e-0f63ac086b6a
uri: /gcmd_keyword/0e53e397-7836-45ec-bc62-0d54f9f176e5