Quantitative Precipitation Forecast
Issued by NWS

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FOUS11 KWBC 220825
QPFHSD

PROBABILISTIC HEAVY SNOW AND ICING DISCUSSION
NWS WEATHER PREDICTION CENTER COLLEGE PARK MD
424 AM EDT SAT APR 22 2017

VALID 12Z SAT APR 22 2017 - 12Z TUE APR 25 2017


...PACIFIC NORTHWEST/NORTHERN AND CENTRAL ROCKIES...

A DRY START TO THE PERIOD IS EXPECTED ACROSS MUCH OF THE REGION AS
A SHORTWAVE RIDGE MOVES EAST ACROSS THE WESTERN U.S. ON SAT.
SHOWERS WILL BECOME MORE NUMEROUS ACROSS THE REGION BY EARLY SUN
AS THE RIDGE GIVES WAY TO THE FIRST OF A PAIR OF PROGRESSIVE
SHORTWAVE TROUGHS THAT ARE FORECAST TO CARVE OUT A BROAD UPPER
TROUGH OVER THE WESTERN U.S.  SNOW SHOWERS ARE FORECAST ALONG THE
NORTHERN TO CENTRAL CASCADES AND PORTIONS OF THE NORTHERN ROCKIES
FROM CENTRAL ID TO NORTHWESTERN WY...BUT WITH SNOW LEVELS EXPECTED
TO BE FAIRLY HIGH WIDESPREAD HEAVY ACCUMULATIONS ARE NOT EXPECTED
THROUGH EARLY MON.  SHOWERS ARE EXPECTED TO CONTINUE THROUGH LATE
MON INTO EARLY TUE WITH THE ARRIVAL OF A SECOND...MORE ROBUST
SHORTWAVE.  AMPLE MOISTURE AND LOWER SNOW LEVELS ARE EXPECTED TO
RAISE THE POTENTIAL FOR HEAVIER SNOW ACCUMULATIONS ACROSS PORTIONS
OF THE CASCADES AND NORTHERN ROCKIES.

THE PROBABILITY OF SIGNIFICANT ICING IS LESS THAN 10 PERCENT.

...NORTHERN NORTH DAKOTA/MINNESOTA...

A SHORTWAVE MOVING THROUGH THE BASE OF A BROAD UPPER TROUGH
CENTERED OVER CENTRAL CANADA IS EXPECTED TO PUSH A COLD FRONT
SOUTH...FOCUSING LIGHT PRECIPITATION ACROSS THE REGION ON SAT.
RAIN CHANGING TO SNOW MAY RESULT IN SOME LIGHT SNOW ACCUMULATIONS
ACROSS PORTIONS OF THE REGION SAT NIGHT.  THIS BOUNDARY IS
EXPECTED TO LINGER ACROSS THE REGION...WITH PRECIPITATION BECOMING
MORE OGRANIZED AS A SHORTWAVE APPROACHES FROM THE WEST.  RAIN
CHANGING TO A RAIN-SNOW MIX MAY RESULT IN SOME ADDITIONAL LIGHT
ACCUMULATIONS FROM NORTHEASTERN ND TO THE MN ARROWHEAD MON NIGHT.
WPC PROBABILISTIC GUIDANCE SHOWS THAT ACCUMULATIONS OF 4-INCHES OR
GREATER CANNOT BE COMPLETELY RULED OUT ACROSS NORTHERN ND AND
MN...HOWEVER THE MORE SIGNIFICANT THREAT IS EXPECTED TO CENTER
FURTHER TO THE NORTH ACROSS POSTIONS OF SOUTHERN MANITOBA AND
WESTERN ONTARIO.

THE PROBABILITY OF SIGNIFICANT ICING IS LESS THAN 10 PERCENT.

PEREIRA

$$





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