Thundersleet Last Night!!!!!!!!! Whoa! You don't hear that often!
Snow is leaving and cold air is pouring into the NYC area.
As precipitation continues to spread out across the Tri-State Area early this morning, there
were some areas of snow, rain and even a few locations that were getting a combination of
BOTH as of 3 a.m. -- the situation will pretty much be changing hourly as the morning wears on...
And while this precipitation has been coming down hard enough in spots to bring down
temperatures several degrees (for example, from 42 degrees in Central Park as of 1 a.m. to 33 as
of 3 a.m.), its intensity will be decreasing later this morning... So, for those places that get a
couple of hours of snow and a slushy accumulation of a coating to an inch or so, that lighter
intensity after 9 a.m. should allow for snow to either mix with, or even completely change back
over to rain, especially in the City and in most coastal communities... For many those places
which are located farther north and west, especially north and west of I-287, the period snow
and some sleet which will be occurring this morning probably won't mix with any rain until this
afternoon, if it does at all... The highest elevations will do the best in this particular storm, with
some places getting more than 6 inches... Conversely, in the City, a slushy coating of snow
early today on non-paved surfaces should get washed away by rain during midday... See our
current maps for storm total snow and ice accumulation... We're trying to convey the idea that
while there should be inch or less of snow which gets washed away by rain in the City and in
most nearby suburbs, an eventual change back over to snow early tonight could bring yet
another small, slushy accumulation... Meanwhile, in some distant northern and western suburbs,
where there will be less rain (and mixing, in general), the accumulation will exceed 3 inches...
One wave of low pressure is moving across the Ohio Valley early this morning, and some
secondary development is anticipated tonight along the coasts of eastern Maryland and
Delaware... This should prolong the precipitation just enough to bring a round of snow after it
gets dark, and there may be a few slick spots on untreated surfaces after midnight tonight...
Temperatures will be critical throughout the duration of this event, since most will probably fail
to get out of the mid or upper-30s today, and should drop into the mid-30s tonight... Obviously,
the colder it gets, the more slick spots there will be late tonight and early tomorrow morning...
As the secondary low pressure system heads out to sea early tomorrow, there should be plenty
of clouds, but nothing more than a leftover shower of snow, or snow mixed with rain... Highs
will be in the 40s...
A polar vortex located in eastern Canada late this week will induce a brisk, northwesterly flow of
air from the surface on up to several-thousand feet... Therefore, while Friday and Saturday are
looking like dry days with at least some sunshine, temperatures will be 5-10 degrees BELOW the
seasonal averages... There is going to be a new wave of low pressure forming in the Plains late
on Friday, which could be a source of some snow and rain here on Sunday... We'll keep you
posted... Have a good day!!!