All of Long Island is now under a Winter Weather Advisory
through this morning`s commute. Large dewpoint depressions
preceding the precip onset along with a more backed wind flow
than what was modeled is helping keep temps across LI at or just
below freezing early this morning with a slow warmup as the
morning commute progresses. Blended in HRRR hourly temps with
the previous forecast to better capture the temperature trends.
Otherwise, more sleet and freezing rain and less snow has
occurred than previously thought. Snow/sleet accumulations have
been lowered, however ice accretion forecast has been bumped up
in many areas, but still within advisory criteria. For coastal
areas, the ice accumulation will be primarily on untreated
surfaces as temps will likely be at least 30. Farther inland,
better chances of accretion of all surface as temps are in the
mid to upper 20s. The previously existing Winter Weather
Advisories remain unchanged for timing, but snow/sleet and ice
accumulations have been adjusted accordingly.