Probabilistic Heavy Snow and Icing Discussion
NWS Weather Prediction Center College Park MD
150 AM EDT Tue Apr 9 2024

Valid 12Z Tue Apr 09 2024 - 12Z Fri Apr 12 2024


...New Mexico...
Day 1...

A robust upper low over northern/northwestern Mexico this morning
will continue moving eastward into West Texas by late this
afternoon/early evening, placing much of southeastern New Mexico
beneath the LFQ of a stout upper jet. Precip has continued to trend
up a bit, with a relatively quick round of snow for the Sacramento
Mountains, especially above 7000ft, aided be upslope flow. The
system will quickly pull east of the region by later tonight.


...Northwest/Northern Rockies...
Day 1...

Northeast Pacific jet will continue to press inland today, coaxing
precipitation eastward from the WA Cascades through northern Idaho
and into northwestern then south central Montana. Heights start to
rise from west to east this afternoon, helping to stymie QPF over
the region. Snow levels will fall a bit to some Cascade pass
levels, with only minor accumulation. Into northwestern Montana,
heavier snow this morning will ease through the afternoon as the
weak shortwave in the flow moves into eastern and south central
Montana as well as around Yellowstone NP. There, and into Idaho,
WPC probabilities for at least 6 inches of snow are highest over
6000ft or so.


The probability of significant snow on days 2 and 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