…Heavy snow over parts of the Sierra Nevada Mountains, light to moderate
snow over Lower Great Lakes/Northern New England, light snow over the
higher elevations of the West…
…There is a Slight Risk of excessive rainfall over parts of Southern
California on Thursday…
…Temperatures will be 15 to 25 degrees above average from the Plains to
the Upper/Middle Mississippi Valley…
A front over California and the Great Basin will move eastward to the
Southern Plains by Saturday. A plume of moisture 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.
Furthermore, the moisture will also create snow over parts of
Northern/Central California, producing heavy snow over the Sierra Nevada
Mountains through Saturday morning.
On Friday, the threat of excessive rainfall will end over California.
However, lighter rain will continue over the West Coast through Saturday.
Higher elevation snow and lower elevation rain will extend from the
Northern Intermountain Region to the Southwest Overnight Thursday into
Friday. Overnight Friday, snow moves into the Rockies, continuing into
Saturday.
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 25 degrees above average from the Plains to the Upper/Middle
Mississippi Valley.
Further, a front over the Great Lakes to the Northern Plains will move
eastward to off the Northeast Coast by Friday and southward to the
Southeast by Saturday. On Thursday, the system will create rain over parts
of the Lower Great Lakes and light to moderate snow over parts of Lower
Great Lakes and Northern New England. On Friday, light snow will linger
over parts of the Lower Great Lakes and the higher elevations of New
England through late Friday night. In addition, light rain will develop
over parts of the Mid-Atlantic on Friday afternoon.
Elsewhere, a developing upper-level low pressure over the Southern Rockies
will pull moisture out of the Western Gulf of Mexico northward over the
Southern/Central Plains, producing showers and thunderstorms over the
region from Friday into Saturday.
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