Short Range Forecast Discussion
NWS Weather Prediction Center College Park MD
128 AM EST Sat Nov 18 2017
Valid 12Z Sat Nov 18 2017 - 12Z Mon Nov 20 2017
...Heavy precipitation possible over parts of the Northwest, Ohio Valley,
Lower Great Lakes, and Northeast...
The first system to impact the lower 48 this period is a complex low
pressure currently in the central Plains. The cyclone is expected to
strengthen as it moves east-northeast across the Upper Midwest, Great
Lakes, and Northeast, spreading heavy precipitation as it and its
associated warm front approach. In its wake, Lake Effect snows are
expected downwind of the Great Lakes within the main zone of its
associated cold advection.
A strong surface high across the Great Basin is expected to lead to a weak
Santa Ana across portions of the L.A. Basin today, which should continue
warmth across the area and lead to elevated fire weather risk per guidance
from the Storm Prediction Center.
Across the Pacific Northwest, onshore flow ramps up as a cold front
approaches the region which should lead to heavy rains and higher
elevation snows as the front moves into the area.
Graphics available at www.wpc.ncep.noaa.gov/basicwx/basicwx_ndfd.php