…Very strong Atmospheric River is starting to press south producing one
last round of heavy rain/mountain snows and strong wind gusts across
portions of central California into tonight…
…Moderate to heavy snow for portions of the Central Appalachians today;
while lighter snows linger across Northeast Interior New England through
Saturday night…
…Elevated Fire Weather conditions exist across northern Peninsular
Florida today…
…Some possible Frost/Freeze conditions across the South tonight…
…Above average temperatures expand across the Central U.S. this
weekend…
Regional RADAR mosaic and GOES Satellite suite show the second strong
surface cyclone lifting north off the Pacific Northwest coast. Stronger
flow aloft has allowed the cold front to finally make an onshore push and
direct the anomalously strong Atmospheric River to direct away from
saturated/flooded areas of Northern California providing beneficial
rainfall across Central California into the Central Sierra Nevada range
where it will continue to produce heavy mountain snows tonight into very
early morning Saturday. Multiple feet of snow is likely to accumulate
generally at or above 7000′. Very strong/gusty winds will slowly
diminish through the rest of the day today, behind the front into the
Pacific Northwest. Given saturated grounds, tree-falls remain possible
and may result in additional power outages. Onshore flow will continue
through the weekend with scattered lighter showers, mountain snows
(reducing in elevation with cold air filtering in) and reducing winds.
A very strong core of an upper-level closed low over the Northeast has
supported a strong surface low with enhanced winds as it is swinging back
around from Upstate New York through Northeast PA before transferring to a
developing surface near Georges Bank toward Nova Scotia. The strength of
the winds and wrapped around moisture is also enhancing upslope flow out
of the Ohio Valley providing another opportunity for moderate to heavy
snows across the Central Appalachians for a few more hours as the storm
moves away. Additional 5-9″ snow is accompanied by high winds that a
Blizzard Warning is in effect until 6pm this evening for portions of
eastern WV. Winter storm warnings and advisories extend into portions of
central and northeast PA and southern and southeast Upstate NY through the
evening as well. By the weekend, the secondary low near Nova Scotia will
take full control and generally stall, throwing moisture and change for
light lingering snow and rain showers through Interior northeast New
England through the weekend.
Along the periphery of this storm, strong winds and dry conditions have
resulted in an area of Elevated Fire Weather (level 1 of 3) to be issued
across the northern neck of Peninsular Florida for the remainder of the
day. Also, behind the front, the higher winds are bringing sufficiently
cold air south that weather service offices in Mississippi and Alabama to
issue Frost and Freeze Warnings.
With the Atmospheric River and stronger westerly flow aloft across the
Rockies, will bring downsloping winds and broad return flow around the
High Pressure across the Southeast/Northeast Gulf of Mexico by the
weekend. This will bring solid warming across the Southern and Central
Plains through the weekend with High temperatures in the 70s and 80s in
the south and 50s and 60s across the the Lower Missouri River and Western
Midwest states…generally 5-15 degrees above normal. A record or two may
be broken. Though another surge of colder Arctic air is starting to nose
into the High Plains of N MT by Sunday (20-30 degrees below normal).
Gallina
Graphics available at
https://www.wpc.ncep.noaa.gov/basicwx/basicwx_ndfd.php
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