…Heavy precipitation moving across California today and again on
Monday…
…Heavy rain expected to develop over southern Texas later today,
shifting east into eastern Texas and Louisiana on Monday…
…Freezing rain and sleet to impact Oklahoma and Kansas this evening,
spreading into the Midwest on Monday, following by wet snow across the
upper Midwest and into the Great Lakes by Tuesday morning…
Sunday morning will begin with a deep freeze engulfing much of the eastern
two-thirds of the country under the dominance of a large dome of arctic
air pressure. Sub-freezing temperatures will reach as far south as
central Texas and northern Florida while sub-zero temperatures will be
found across the upper Midwest. The expansive area of high pressure will
then slide eastward to reach the East Coast on Monday. With no additional
replenishment of arctic air from Canada, a steady warm-up is in store for
the mid-section of the country. Deep return flow behind the high pressure
system will begin to set up a channel of moisture from the Gulf of Mexico
into the southern Plains later today into Monday. The chance of heavy
rain is expected to increase quickly across southern Texas this evening
and continue into Monday. Meanwhile, the presence of arctic air farther
north will support mixed precipitation, sleet and ice as the moisture
reaches into Oklahoma and Kansas tonight. The moisture will continue to
surge northeastward into the Midwest on Monday, overrunning the arctic air
and resulting in freezing rain/sleet. By Monday night into early Tuesday,
an upper-level trough exiting the southern Rockies will interact with a
front to bring an expanding area of snow into the upper Midwest into lower
Michigan toward the lower Great Lakes. Meanwhile, lake-effect snow this
morning downwind from the Great Lakes will gradually taper off later
today, as will the upslope snow over portions of the central Appalachians.
Along the West Coast, multiple frontal systems arriving from the Pacific
will bring more active weather onshore through the next couple of days.
Heavy rain will likely continue across northern California today, followed
by a brief lull this evening before the next surge of heavy rain expected
to arrive on Monday. Meanwhile, heavy wet snow is expected along the
Sierra Nevada during similar time frame. In addition, the influx of
warmer air overrunning the trapped cold air near the ground will continue
to bring the potential of ice/freezing rain for the Columbia Gorge for the
next couple of days. Mixed precipitation will begin to penetrate further
inland across the Four Corners by Monday night into Tuesday morning with
the passage of an upper-level trough as precipitation tapers off in
California. Unsettled weather will also continue along the coast of the
Pacific Northwest.
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