…More heavy lake-effect snow expected through the next couple of days
across the Great Lakes…
…A reinforcing shot of polar air from Canada will bring a period of
light snow from the northern Plains to the southern Appalachians followed
by colder temperatures through the next couple of days…
…Showers and thunderstorms will be edging closer toward the lower Texas
coast through the next couple of days…
…Temperatures will be 10 to 15 degrees below average over parts of the
northern Plains to the Ohio Valley, into the Mid-Atlantic and the
Southeast…
A synoptic pattern that favors broad upper-level troughing in North
America will continue to periodically usher polar air from Canada into the
eastern two-thirds of the country while relatively mild and dry weather
persists across the western U.S. The leading edge of the next surge polar
air is currently dipping into the northern High Plains. A period of light
snow is expected to spread from the northern Plains, across the Midwest,
Ohio Valley and then into the southern Appalachians ahead of a wave of low
pressure forming along the cold front. An arctic high pressure system
behind the front will usher colder air into these areas, bringing
temperatures of 10 to 15 degrees below average. In the mean time, light
snow across the central and southern Appalachians is expected to taper off
into tonight.
As the relatively cold air flows over the relatively warm waters of the
Great Lakes, more lake-effect snow can be expected across the Great Lakes,
although they should be less active for parts of the recently harder-hit
locations as the wind direction turns more southwesterly. Locally a
couple of feet of new snow is possible downwind from Lake Michigan and
Lake Erie through the next couple of days.
Meanwhile, moisture has been gradually gathering in the western Gulf of
Mexico to the south of Texas along a convergence zone where a low pressure
wave is forecast to form over the next couple of days. As the wave begins
to interact with colder air filtering from the north, scattered showers
and thunderstorms are expected to gradually expand and edge toward the
lower Texas coast and into southern Texas through Tuesday. Elsewhere,
upper-level ridging over the western U.S. will create stagnant air
conditions over the valley locations from interior California into the
Pacific Northwest, leading to areas of dense fog and poor air quality.
Kong
Graphics available at
https://www.wpc.ncep.noaa.gov/basicwx/basicwx_ndfd.php