…Heavy snow over parts of the Sierra Nevada Mountains, moderate snow
over Upstate New York/Northern New England, light snow over the higher
elevations of the West…
…There is a Slight Risk of excessive rainfall over parts of Northern/
Central California on Wednesday and Southern California on Thursday…
…Temperatures will be 15 to 30 degrees above average from the Plains to
the Upper/Middle Mississippi Valley…
A front moving onshore over the West Coast will move inland to the Rockies
by Friday morning. A plume of moisture will move along the West Coast and
then transition into Southern California overnight Wednesday. On
Wednesday, the robust plume of moisture will move over California,
creating heavy rain over California. Therefore, the WPC has issued a
Slight Risk of excessive rainfall over parts of Northern/Central
California and extending a small part of Southern California through
Thursday morning. The associated heavy rain will create mainly localized
areas of flash flooding, with urban areas, roads, small streams, and burn
scars the most vulnerable.
Furthermore, the moisture will also create snow over parts of
Northern/Central California. The Shasta and Sierra Nevada mountains will
get heavy snow from late Wednesday morning into Thursday morning.
On Thursday, the moisture plume will aim at Southern California, producing
heavy rain. Therefore, the WPC has issued a Slight Risk of excessive
rainfall over parts of Southern California from Thursday into Friday
morning. The associated heavy rain will create mainly localized areas of
flash flooding, with urban areas, roads, small streams, and burn scars the
most vulnerable.
Moreover, the heavy snow will continue over the Sierra Nevada Mountains on
Thursday. In addition, as the moisture moves inland over most of the West,
rain will develop at the lower elevations and snow over the highest
elevations across most of the West.
Meanwhile, a sharp upper-level ridge will develop over the Northern Plains
into the Middle Mississippi Valley. Due to the ridge, temperatures will be
15 to 30 degrees above average from the Plains to the Upper/Middle
Mississippi Valley.
Further, overnight Wednesday, a front moving out of East-Central Canada
will move into the Great Lakes and Northeast on Thursday. The system will
aid in creating light snow over parts of New York State and Northern New
England on Thursday.
Elsewhere, low pressure over the Southern Appalachians will redevelop over
the Western Atlantic by Wednesday evening and continue to move eastward
over the ocean. The system will produce light snow over the higher
elevations of the Central Appalachians and light rain over the Southern
Appalachians and the southern Mid-Atlantic. All the precipitation will end
by Wednesday evening.
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