I went to the Brooklyn Botanic Garden’s website to see if they had anything there about the unprecedented blooming of five cherry trees. Sure enough they did:

"What better way to appreciate the unusual warmth of this winter than
to view Brooklyn Botanic Garden’s "cherry jubilee"? Presently, there
are five everblooming cherries (Prunus‘Fudan-Zakura’) in flower
at Brooklyn Botanic Garden, bringing an extra touch of magic to an
already exceptional winter season. Though the everblooming cherries are
expected to flower in late November, the amount of blossoms on the
cherry trees at this time has astounded visitors to the Japanese
Hill-and-Pond Garden. The trees are boasting thousands of
flowers—instead of the couple of hundred that usually appear during the
November bloom—thanks to the mild weather of the past several weeks.

Despite this extraordinary blossoming, the everblooming cherries
will bloom again in the spring per their "regular" schedule, making
this event a rare preview of New York’s rite of spring, Hanami—the
Japanese tradition of viewing and cherishing each moment of the cherry
blossom season. During Hanami, visitors can witness the breathtaking
cycle of flowering cherry trees—from the first buds to the brilliant
blossoms to the petals falling like pink snow—and celebrate Sakura
Matsuri, a two-day celebration of Japanese culture with over 60 events
and performances.