FOUS11 KWBC 210820
QPFHSD

Probabilistic Heavy Snow and Icing Discussion
NWS Weather Prediction Center College Park MD
420 AM EDT Mon Oct 21 2024

Valid 12Z Mon Oct 21 2024 - 12Z Thu Oct 24 2024

...Colorado Rockies...

Day 1...
An upper low centered over central CO early this morning will shift
east into KS by early afternoon. Comma head precip, moderate at
times, on the back side of the low will persist over the north-
central CO Rockies through this morning with snow levels around
9000ft. Probs for an additional >6" snow between 12Z and 18Z are
around 50 percent in portions of the Front Range.


...Glacier National Park...
Day 1...

An upper trough axis reaches the PacNW coast early this morning and
shift ENE through western MT this evening. An inland surge of
Pacific moisture ahead of this trough maintains high snow levels
over the Northwest today, but height falls are sufficient by this
evening to allow snow levels to drop on the Lewis Range through
Glacier NP to drop from around 7000 to 5000ft tonight. PWPF for >6"
is around 30 percent on the higher peaks of the park.


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

Jackson


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