Probabilistic Heavy Snow and Icing Discussion
NWS Weather Prediction Center College Park MD
416 PM EDT Sun Oct 13 2024

Valid 00Z Mon Oct 14 2024 - 00Z Thu Oct 17 2024


...Northeast...
Days 1-3...

A potent trough crosses the Great Lakes tonight and spins into a
closed low over Maine on Monday. This low stalls as a reinforcing
trough dives over the Upper Midwest Monday night before digging
through the southern Appalachians through Tuesday night. Troughing
then extends down the length of the Eastern Seaboard Wednesday.
Snow levels drop below 3000ft over Northeastern terrain such as
the Adirondacks, Greens, and Whites through Monday on the back side
of the developing low. Snow levels then remain around 2000ft across
most of NY and New England through Wednesday. Several inches of
snow will fall in occasional precip through these terrain areas
with 72hr totals over 6" most likely above about 4000ft in the
Adirondacks, Greens, and Whites.


...Northwest...
Day 3...

A deep low currently in the Gulf of Alaska dislodges southeast
Tuesday night and a reinforcing upper trough rounds the low and
pushes over the Pacific Northwest on Wednesday. Strong moisture
advection ahead of this trough allows at least moderate precip
rates and the height falls on Wednesday allow snow levels to drop
to around 5000ft over the Washington Cascades by Wednesday
afternoon. Heavy snow is expected in the highest Cascades with
accumulating snow reaching the higher level WA passes by 00Z
Thursday.


The probability of significant ice across the CONUS is less than
10 percent.


Jackson