520
FOUS11 KWBC 131817
QPFHSD
PROBABILISTIC HEAVY SNOW AND ICING DISCUSSION
NWS WEATHER PREDICTION CENTER COLLEGE PARK MD
217 PM EDT TUE OCT 13 2026
VALID 00Z WED OCT 14 2026 - 00Z SAT OCT 17 2026
..GREAT BASIN TO THE CENTRAL ROCKIES
DAYS 1-2...
THE MID-LEVEL LOW OVER NEVADA WILL PUSH TOWARD THE AZ/UT BORDER BY
LATE TONIGHT AND INTO COLORADO BY LATER WEDNESDAY, FINALLY
REACHING THE CENTRAL PLAINS BY THURSDAY AND WEAKENING. THIS SYSTEM
WILL BRING HIGHER ELEVATION SNOW TO PORTIONS OF UT/CO/WY, ENDING
FROM WEST TO EAST AND LASTLY OVER THE CO ROCKIES THURSDAY EVENING.
SNOW LEVELS WILL START HIGH AHEAD OF THE SYSTEM (8000-10,000FT),
BUT GRADUALLY LOWER AS THE UPPER LOW MOVES OVERHEAD (6500-9000FT).
ANY SIGNIFICANT SNOWFALL ACCUMULATIONS ARE EXPECTED TO REMAIN IN
THE ELEVATED TERRAIN, WHERE WPC PROBABILITIES FOR AT LEAST AN
ADDITIONAL 8 INCHES OF SNOW ARE >50% ABOVE 10,000FT IN UT AND CO.
SOME LIGHTER ACCUMULATIONS COULD FALL AS LOW AS 6500 OR 7000 FEET
AS THE UPPER LOW MOVES OVERHEAD IN SOUTHEAST WY EARLY THURSDAY. THE
HIGHEST ADDITIONAL AMOUNTS WILL BE IN THE SAN JUAN MOUNTAINS OF
SOUTHWEST CO AND ALSO ACROSS THE MEDICINE BOW AND MOSQUITO RANGE
WHERE OVER A FOOT IS POSSIBLE.
FRACASSO/SNELL
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