Probabilistic Heavy Snow and Icing Discussion
NWS Weather Prediction Center College Park MD
349 AM EDT Sun Oct 01 2023

Valid 12Z Sun Oct 01 2023 - 12Z Wed Oct 04 2023

...Sierra Nevada and White Mountains...
Day 1...

An upper low over southern Nevada lifts over Utah this morning
while a reinforcing trough currently near the OR/CA coastal border
shifts down the CA coast today closing over SoCal this afternoon.
Showers develop over the Sierra Nevada this afternoon from
instability under the upper trough (snow levels generally around
8500ft) with a northeasterly flow developing from surface low
pressure intensifying over southern NV. Day 1 snow probabilities
are moderately high for 4"+ over the High Sierra and the White
Mtns.


...Utah through the Northern Rockies...
Days 1-3...

The low lifting over western Utah this morning sends moderate
precip on a southerly flow over the Wasatch and Uintas today with
snow levels around 9000ft. Day 1 WPC snow probs are moderately
high for 6"+ for the Uintas with the highest Wasatch on a similar
scale. The reinforcing low from the CA coast today and up western
UT late tonight into Monday sends another round of moderate precip
through northern UT and western WY with snow levels dropping to
around 8500ft with Day 2 snow probs moderate for 6"+ over the
Uintas and Wind River with moderate snow over the
Tetons/Absarokas/Bighorns.

Continued troughing over the northern Rockies makes for light to
locally moderate precip with snow levels around 8000ft Tuesday.



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

Jackson