Updated discussion from LWX. More of a re-read of the forecast than a discussion.
.NEAR TERM /UNTIL 6 AM TUESDAY MORNING/...
For the evening update, have refined timing of precip onset and
changeover but did not change snow amounts. Have raised ice
amounts west of I-95 Wednesday into Wednesday night based on
latest guidance and trends. Additional winter weather headlines
may be needed for this period especially west of US-15 and over
northern MD.
Otherwise, temperatures fall into the 20s to low 30s overnight.
Cloud cover increases overnight as surface low pressure
approaches from the south.
&&
.SHORT TERM /6 AM TUESDAY MORNING THROUGH WEDNESDAY NIGHT/...
A low pressure system will bring widespread snow to the area
Tuesday afternoon through the overnight. Snow overspreads the
area from southwest to northeast beginning Tuesday morning with
snow reaching the metro areas in the early afternoon. A Winter
Storm Warning is in effect for the areas along and south of
I-66 and the Washington DC metros. For the warned areas, heavy
snow is expected with total accumulations between 4-7 inches.
Locally higher amounts up to 8 inches are possible along the
highest ridges in the Blue Ridge and Allegheny mountains. Further
north, Winter Weather Advisories are in effect for areas along
the MD/PA border with snow accumulation between 3 and 6 inches
expected. Ice accumulations up to a tenth of an inch are
possible along and west of the Blue Ridge Tuesday through
Tuesday night with the greatest chances being for those in the
southern portions of the area.
Precipitation lulls Wednesday morning for a few hours before
another low pressure system brings another round of wintry
precipitation to the area. Mixed precipitation is expected with
the main threat being freezing rain beginning Wednesday
afternoon. A light wintry mix is possible Wednesday morning
into the midday, before a steadier wintry mix occurs late
Wednesday afternoon into Wednesday night. Total snow
accumulations up to 1 inch and ice accumulations around one
quarter of an inch are possible with a Winter Storm Watch in
effect for the Alleghenies and Blue Ridge.
East of the Blue Ridge, temperatures will be above freezing with
precipitation type likely remaining as rain throughout the day.
To stay up to date with lastest headlines and accumulations,
visit weather.gov/lwx/winter