RPCAm_POL
Polar/Eurasia (RPCA monthly)
Monthly Polar/Eurasia index from the rotated-PCA fit of the month's standardized 500-hPa anomaly map; compare the official CPC value. — Barnston & Livezey 1987; NOAA CPC
DATA THROUGH 2026-10-12 · UPDATED 2026-10-13 11:02 UTC
Monthly Polar/Eurasia index from the rotated-PCA fit of the month's standardized 500-hPa anomaly map; compare the official CPC value. — Barnston & Livezey 1987; NOAA CPC