Though not entirely relevant, today's cpc
Analogs to the 5 day mean observed pattern centered 3 days ago (D-3)
for the region from 20N to 70N latitude and 175E to 60W longitude
include the 5 day periods centered on the following dates:
19611206 - 19671122 - 19661106 - 19551110 - 19511210
Analogs to the 7 day mean observed pattern centered 4 days ago (D-4)
for the region from 20N to 70N latitude and 175E to 60W longitude
include the 7 day periods centered on the following dates:
19611205 - 19661105 - 19551111 - 19691113 - 19671122