Weather Monday Feb 5 2024 LA flooding, Sierra Snows So Fla Rains

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Life threatening and damaging Flash Flooding likely across much of
central/southern California through Monday.
Heavy Snow for parts of the Sierra Nevada and the Great Basin.
The ongoing Atmospheric River event will continue to produce heavy rain,
strong winds, high surf, and heavy snow across much of central and
southern California over the next few days. High rain rates over very
vulnerable/primed surfaces will lead to flash flooding tonight across
portions of central and southern California, which is why there's a
Moderate Risk of Excessive Rainfall (level 3/4) for this area with an
embedded High Risk (level 4/4) area over parts of Santa Barbara, Ventura
and Los Angeles Counties. Heavy rain will also occur over the foothills of
the Sierra Nevada tonight where a Slight Risk of Excessive Rainfall (level
2/4) is in effect. Heavy snow will continue across the Sierra and Shasta
Siskiyous through Monday where 1-3' of snow are expected with isolated 4'
amounts over the highest elevations. Some snow is also likely for the
Great Basin where up to a foot of snow is possible over portions of
central Nevada. Strong winds will cause high surf up and down the
California coast, whipping rain at lower elevations and blowing snow
across the Sierra are also likely with High Wind and Winter Storm Warnings
in effect for parts of the state.
The moisture plume sags south Monday night into Tuesday and focuses along
a surface cold front over southern California and the southern Sierra
Nevada. Heavy to Excessive Rainfall is likely from San Luis County down to
San Diego County, where a Slight Risk of Excessive Rainfall is in effect.
Another High Risk of Excessive Rainfall is in effect for parts of Los
Angeles and Orange Counties on Monday where areal totals of 1-3" of rain
and isolated higher amounts are possible. Heavy Snow impacts will wane
across northern/central Sierra while continuing over the southern section
of the mountain range. Cool air will filter in on the backside of the cold
front and allow for heavy snow to develop over the higher elevations of
the Transverse Ranges. About another foot of snow is forecast for the
southern Sierra, and 1-2' are possible over the Transverse Ranges and
Central Great Basin. Rain and snow will continue over the Central Great
Basin of Nevada where around a foot of snow is expected.
Elsewhere, some moderate to heavy rain and thunderstorms are possible over
coastal areas of Georgia and South Carolina tonight where a Marginal Risk
of Excessive Rainfall is in effect (level 1/4). Around an inch of rainfall
is currently forecast for that area. Some light rain and snow are also
possible over portions of the Pacific Northwest and Northern Rockies. Up
to a foot of snow is possible for parts of the Cascades and Northern
Rockies through Monday afternoon. An upper-level ridge will strengthen
over the Central U.S. this week, leading to increasingly abnormally mild
temperatures for much of the Central and Eastern thirds of the country.
Temperatures across the Northern Plains and Upper Midwest will be 30-40
degrees above average which may tie or break existing daily temperature
records.