Snowy weather pattern continues in the interior mountains of
northwestern U.S. and down into the Sierra Nevada as the next round of
enhanced rainfall reaches northwestern California and southwestern Oregon
on Tuesday.

Accumulating snowfall near the Canadian border of the Northern Plains
expected to taper off early on Monday.

Another coastal storm is forecast to bring new round of rain up the
Atlantic coast from later Monday through Tuesday as some threat of heavy
rain emerges along the central Gulf Coast.

Much above average, Spring-like temperatures shifting from the
Plains/Midwest into the Northeast as Critical Fire Weather threat persists
through tonight in the central/southern High Plains.

As the main energy associated with the latest winter storm that impacted
the western U.S. moves off into the northern Plains, the intensity of the
snow and high winds along the Sierra Nevada as well as across the
Intermountain West will gradually wane through Monday.  However,
reinforcing upper-level energies arriving from the Pacific with keep the
unstable cold air mass in place across a large section of the western
U.S., with frequent rounds of mountain snows continuing and reaching as
far east as the central Rockies through the next couple of days.  From
later on Monday into Tuesday, another influx of moisture from the next
Pacific frontal system is expected to bring a renewed round of enhanced
rainfall from northwestern California to southwestern Oregon where some
locally heavy rainfall may occur.  Some embedded thunderstorms could also
reach farther north along the coast of the Pacific Northwest and northern
California on Monday as added instability associated with a surface trough
edges toward the coast.  The moisture will then penetrate inland, reaching
into the northern Rockies as a round of moderate to locally heavy mountain
snows on Tuesday.

Meanwhile, an intensifying low pressure system is bringing a round of
accumulating snowfall near the Canadian border of North Dakota with a
wintry mix farther east across northern Minnesota on Sunday.  The
precipitation will taper off later tonight as the storm moves farther away
into southern Canada.  To the south and east, the recent dry spell will
initially limit rainfall amounts along a wavy front trailing southwest
toward a developing low pressure system over the central High Plains. 
However, persistent southerly flow from the Gulf of Mexico will eventually
direct moisture northward to expand an area of rain from the Midwest to
the Great Lakes later on Monday into Tuesday.  Meanwhile, an upper-level
disturbance will begin to interact with the returning Gulf moisture to
bring an emerging threat of heavy rain into the central Gulf Coast states
on Tuesday and especially by Tuesday evening.

Along the East Coast, following a recent round of widespread enhanced
rainfall, another coastal low pressure system is forecast to form along
the stalled front and track up the Mid-Atlantic coast Monday into Tuesday.
 This relatively compact system is forecast to deliver another round of
enhanced rainfall up the Mid-Atlantic states Monday and Tuesday, reaching
into New England by Tuesday afternoon.  Across Florida, thunderstorm
chances are forecast to decrease as the lingering front weakens with time
but they will increase again later on Tuesday as the aforementioned
upper-level disturbance begins to approach from the west.

Widespread much above average, Spring-like high temperatures will persist
across the central/eastern U.S. into Monday. The greatest anomalies of
25-35 degrees over the lower/mid-Missouri Valley northeastward into the
upper Great Lakes on Sunday will shift into the Ohio Valley, lower Great
Lakes, and interior Northeast on Monday.