Probabilistic Heavy Snow and Icing Discussion
NWS Weather Prediction Center College Park MD
156 AM EDT Mon Apr 8 2024

Valid 12Z Mon Apr 08 2024 - 12Z Thu Apr 11 2024


...Wyoming/Black Hills & CO Rockies...
Day 1...

Exiting system will wrap around one more round of snow for the
Bighorns and Black Hills this morning before finally ending later
this afternoon. WPC probabilities for at least another 4 inches of
snow are >50% in these areas, with lighter snow up to an inch or
two for much of the rest of eastern Wyoming.

To the south, mainly light snow is forecast for the CO Rockies into
northeastern NM tied to a southern stream disturbance, with any
appreciable snowfall on the higher peaks of the San Juans and
Sangre de Cristos.


...Northwest...
Days 1-2...

Approaching upper jet out of the northeastern Pacific will bring
in moisture to the Olympics and WA Cascades later today and
especially overnight into Tuesday, with downstream snow for the
northern Idaho mountains and northwestern Montana. Progressive flow
will move the moisture through the region and taper off from west
to east starting Tuesday afternoon (WA) into very early Wednesday
(MT). Snow levels are forecast to quickly rise from about 3500ft up
to about 5000-5500ft or so as the system moves through, confining
much of the snowfall to above pass level.


The probability of significant snow on day 3 is less than 10
percent.

For days 1-3, the probability of significant icing of at least
0.25 inches is less than 10 percent.


Fracasso