LWX afternoon AFD
Monday will start out dry outside of the Alleghenies where upslope
snow showers are expected. High temperatures will reach the low
to mid 30s for most of the area with higher elevations staying
in the 20s. Shortwave energy aloft will lead to a chance of
light snow areawide Monday afternoon, with accumulations ranging
from 0.5-1.5" outside the Alleghenies where higher
accumulations are possible. We will continue to monitor as there
is a good bit of model discrepancy with this system. Low
temperatures Monday night will fall into the 20s for most with
higher elevations dipping into the teens.
&&
.LONG TERM /MONDAY NIGHT THROUGH FRIDAY/...
A broad area of lower heights will persist across much of the CONUS
over the next week. Over time, ridging builds near the West Coast,
and downstream blocking may develop near the Canadian Maritimes.
At the surface, Arctic high pressure will build over the central to
eastern CONUS while multiple waves of low pressure pass from the Mid-
South toward the Carolinas and Mid-Atlantic.
One wave of low pressure will likely pass to the south Monday night
into Tuesday. Mid/upper-level forcing coupled with modest moisture
should result in the development of some light snow across at least
parts of the area. Guidance continues to gradually come into better
agreement on a light, jet-induced snow event well northwest of a
weak and progressive surface low offshore. This is not a traditional
or classic setup for widespread significant snow, but the timing of
any accumulating snow coupled with very cold temperatures with the
Tuesday morning commute could prove treacherous. Additionally, it
has been about two years since the DC Metro saw more than an inch of
snow, which may also magnify any potential impacts.