Quantitative Precipitation Forecast
Issued by NWS

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FOUS11 KWBC 221935
QPFHSD

PROBABILISTIC HEAVY SNOW AND ICING DISCUSSION
NWS WEATHER PREDICTION CENTER COLLEGE PARK MD
335 PM EDT SUN APR 22 2018

VALID 00Z MON APR 23 2018 - 00Z THU APR 26 2018

DAYS 1-3...

...NORTHERN INTER-MOUNTAIN WEST TO NORTHERN HIGH PLAINS...

UPPER DYNAMICS ORGANIZING OVER THE PAC NW AND ON THE TAIL END OF A
POLAR FRONTAL ZONE WILL STREAM THROUGH THE NORTHERN INTER-MOUNTAIN
WEST ON MONDAY BEFORE EMERGING OUT OVER THE NORTHERN TO CENTRAL
HIGH PLAINS. THIS SYSTEM WILL CAPITALIZE ON ENHANCED UPSLOPE FLOW
FOR HEAVY SNOW FROM SOUTHERN MT AND NORTHERN WY ON MON, INCLUDING
THE NORTHERN TETONS/ABSAROKA AND BIG HORN MTNS, AND ACROSS NERN
WY/SERN MT INTO WESTERN PORTIONS OF SD INCLUDING THE BLACK HILLS
ON TUES. WPC FOLLOWED A 50/50 BLEND OF THE ECMWF AND GFS THERMALS
FOR HEAVY SNOW PROBS, AS SPREAD WITH THE GUIDANCE HAS NARROWED.

THE PROBABILITY OF ICING GREATER THAN 0.25 INCHES IS LESS THAN 10
PERCENT ON EACH OF THE THREE DAYS.

MUSHER





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