…Heavy snow for the Sierra Nevada Mountains and Higher elevation snow
across the West; Lake-effect snow downwind from the Great Lakes and
upslope snow for the Central Appalachians on Sunday…
…There is a Slight Risk of excessive rainfall over parts of Northern
California, Southern California, and over the Western Gulf Coast/Lower
Mississippi Valley…
…Rain/Freezing Rain over parts of the Pacific Northwest and the Northern
High Plains and heavy rain/freezing rain over parts of the Southern
Plains, Lower/Middle Mississippi Valley…
High pressure over the Middle Mississippi Valley will slowly move eastward
to the Mid-Atlantic Coast by Monday evening. Cold air associated with the
high will create temperatures 20 to 30 degrees below average from the
Central/Southern Plains, Middle Mississippi Valley, and Ohio/Tennessee
Valleys. Upper-level energy over the Great Lakes, Ohio Valley, and
Mid-Atlantic will produce lake-effect snow downwind from the Great Lakes
through Sunday evening. There will also be upslope snow over parts of the
Central Appalachians and the Northeast.
Multiple fronts will move onshore over the West and dissipate over the
next few days. The systems will produce heavy snow over the Sierra Nevada
Mountains and the highest-elevation snow over the West, extending into the
higher elevations of the Southwest. In addition, a plume of moisture will
move over parts of Northern California, producing heavy rain from Saturday
into Monday. Therefore, the WPC has issued a Slight Risk of excessive
rainfall over parts of Northern California into Sunday morning. The
associated heavy rain will create mainly localized areas of flash
flooding, with urban areas, roads, small streams, narrow canyons/gullies,
and burn scars the most vulnerable.
Moreover, on Sunday, the threat of excessive rainfall continues over
Northern California. Therefore, the WPC has issued a Slight Risk of
excessive rainfall over parts of Northern California from Sunday into
Monday morning. The associated heavy rain will create mainly localized
areas of flash flooding, with urban areas, roads, small streams, narrow
canyons/gullies, and burn scars the most vulnerable.
On Monday, the plume of moisture will stream into Southern California,
producing heavy rain. Therefore, the WPC has issued a Slight Risk of
excessive rainfall over parts of Southern California on Monday. The
associated heavy rain will create mainly localized areas of flash
flooding, with urban areas, roads, small streams, narrow canyons/gullies,
and burn scars the most vulnerable.
Furthermore, warmer air associated with the plume of moisture will
contribute to rain/freezing rain over parts of the Pacific Northwest in
the region of the Columbia Gorge through Monday. In addition,
rain/freezing rain will develop over parts of the Northern Plains on
Monday.
Elsewhere, the flow around the area of high pressure over the Eastern U.
S. will stream moisture northward from the Western Gulf of Mexico combined
with upper-level energy, which will aid in producing rain over parts of
southern Texas on Sunday. The moisture will continue to flow northward
over the Southern Plains and Lower Mississippi Valley into the Great Lakes
on Monday. The moisture flow will also produce showers, thunderstorms, and
heavy rain over parts of the Western Gulf Coast and Lower Mississippi
Valley. Therefore, the WPC has issued a Slight Risk of excessive rainfall
over parts of the Western Gulf Coast and Lower Mississippi Valley on
Monday. The associated heavy rain will create mainly localized areas of
flash flooding, with urban areas, roads, and small streams the most
vulnerable.
Meanwhile, the moisture flows northward into the cold air over the country
s middle part, producing heavy rain/freezing rain over parts of the
Southern Plains, Lower/Middle Mississippi Valley on Monday. Additionally,
light rain/freezing rain will develop over parts of the Western Ohio
Valley into The Great Lakes.
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