Short Range Forecast Discussion
NWS Weather Prediction Center College Park MD
156 AM EST Mon Dec 17 2018
Valid 12Z Mon Dec 17 2018 - 12Z Wed Dec 19 2018
...Unsettled for the Northeast and Pacific Northwest with mainly dry
conditions for the central states...
The occluded low pressure system that has affected the eastern U.S. with
heavy rain over the past couple of days is now mainly offshore. However,
there will be enough wrap-around moisture to the northwest of the low to
generate a band of moderate to heavy snow across northern New England,
particularly eastern Maine where 4 to 8 inches of snow is likely, with
locally higher amounts. Mainly rain is expected closer to the New England
coast before drier weather arrives on Tuesday.
The weather pattern continues to remain quite active for the West Coast
and Intermountain West as two separate events affect the region. The
first is ongoing with a Pacific cold front bringing widespread rain and
mountain snow from central California to the northern Rockies. There will
not be much of a break before the second storm system arrives by Monday
evening and lasting into Tuesday. This will also have a strong onshore
flow associated with it, and given the strong pressure gradient, strong
and gusty winds are likely for coastal areas and exposed terrain.
Snowfall could easily exceed a foot for the Washington Cascades and the
Idaho mountains with this second event.
Elsewhere across the continental U.S., mainly dry conditions are expected
from the Rockies to Florida as an expansive high pressure ridge governs
the weather pattern for the first half of the week. Overall, temperatures
are expected to be near to above average for the majority of the
continental U.S. through Tuesday, with the exception of the Northeast U.S.
on Tuesday where a brief surge of colder weather will produce readings
Graphics available at www.wpc.ncep.noaa.gov/basicwx/basicwx_ndfd.php