Probabilistic Heavy Snow and Icing Discussion
NWS Weather Prediction Center College Park MD
340 AM EDT Mon Oct 02 2023

Valid 12Z Mon Oct 02 2023 - 12Z Thu Oct 05 2023

...Utah through Western Wyoming...
Days 1-2...

The next wave rounding the positively-tilted upper trough axis
extending from western MT through southern CA is over the NV/AZ
border early this morning and will track NNE over western UT to
western WY today. This track is a bit west of the one from
yesterday morning and the southerly flow east of this wave will
again cross over the Wasatch and Uintas and bring moderate precip
with with snow levels dropping to around 8500ft. An additional
6-10" across this highest terrain is expected today. The moist
southerly flow causes like to moderate precip over the ranges of
western WY through tonight with snow levels generally around
9000ft. The Day 1.5 WPC snow probs are moderate for 6"+ over the
Wind River and Absarokas.

The trough axis ejects east Monday night, bringing an end to
precip through this corridor from UT through WY which only light
snow persisting into Tuesday.

Elsewhere, an atmospheric river pushing over the Pacific Northwest
today is much more potent with precip than previously progged, but
as it most ARs, the snow level is high over the WA/OR Cascades -
generally around 10,000ft.

Ridging then builds over the western U.S. Tuesday into Friday,
making for a quiet stretch precip-wise over the western U.S. later
this week/through the weekend.


The probability of any ice accumulation across the Continental
U.S. is less than 10 percent.

Jackson