Probabilistic Heavy Snow and Icing Discussion
NWS Weather Prediction Center College Park MD
401 AM EDT Wed May 01 2019

Valid 12Z Wed May 01 2019 - 12Z Sat May 04 2019

...Central Rockies to High Plains of Nebraska and South Dakota...
Day 1...

Shortwave trough and associated jet streak clearly evident on
GOES-16 WV imagery this morning will continue to lift northeast
from the Central Rockies through today. Periods of moderate to at
times heavy snow will occur through this afternoon from the
Colorado Rockies into the mountains of WY and east towards the
Black Hills as ascent persists through height falls, RRQ
diffluence, and subtle low-level frontogenesis along a weak
baroclinic boundary into the Plains. Total snowfall should remain
modest as forcing ejects to the northeast this evening, and WPC
probabilities are highest for 4 inches in the highest terrain of
the San Juans, as well as the Black Hills where higher snow ratios
and enhancement due to upslope occur.

The probability for significant freezing rain is less than 10
percent all 3 days.

Weiss