EPO
East Pacific Oscillation
500-hPa box difference, 20–35°N minus 55–65°N at 160–125°W (NOAA/PSL). Negative = ridge over Alaska and cold air delivery to central North America.
DATA THROUGH 2026-10-12 · UPDATED 2026-10-13 11:02 UTC
500-hPa box difference, 20–35°N minus 55–65°N at 160–125°W (NOAA/PSL). Negative = ridge over Alaska and cold air delivery to central North America.