Quantitative Precipitation Forecast
Issued by NWS

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FOUS11 KWBC 172018
QPFHSD

PROBABILISTIC HEAVY SNOW AND ICING DISCUSSION
NWS WEATHER PREDICTION CENTER COLLEGE PARK MD
417 PM EDT MON APR 17 2017

VALID 00Z TUE APR 18 2017 - 00Z FRI APR 21 2017

...WESTERN U.S....

HEAVY PRECIP EXPECTED TO IMPACT CENTRAL CALIFORNIA ON TUESDAY WITH
GOOD SURGE OF MOISTURE INTO THE SIERRAS. HEAVY SNOWFALL EXPECTED
ACROSS THE HIGHER ELEVATIONS OF THE CENTRAL SIERRAS WITH SNOW
LEVELS EXPECTED TO REMAIN HIGH. STRONG JET AND MID LEVEL SHORTWAVE
ENERGY REACHING THE WEST COAST BY MIDDAY TUESDAY WILL PUSH INTO
THE GREAT BASIN BRINGING SNOW TO PARTS OF THE NORTHERN ROCKIES
INTO WEDNESDAY. MODERATE SNOWFALL EXPECTED ACROSS THE TETONS AND
BIGHORN MOUNTAINS IN WYOMING WITH LIGHTER AMOUNTS ACROSS THE
UNITAS IN NORTHERN UTAH. ANOTHER MORE AMPLIFIED TROUGH WILL REACH
THE PAC NORTHWEST BY THURSDAY WITH LIGHT SNOW ACROSS THE HIGHER
ELEVATIONS WITH SNOW LEVELS AGAIN REMAINING HIGH.

...NORTHERN PLAINS/UPPER MIDWEST...

A WELL-DEFINED MID-UPPER LEVEL LOW CURRENTLY MOVING ACROSS THE
PACIFIC NORTHWEST IS EXPECTED TO MOVE QUICKLY ACROSS THE NORTHERN
ROCKIES ON MON...WEAKENING AS IT CONTINUES EAST ACROSS THE
NORTHERN PLAINS INTO THE UPPER MIDWEST MON NIGHT-EARLY TUE.  THIS
SYSTEM IS EXPECTED TO PRODUCE MIXED PRECIPITATION ACROSS
NORTHEASTERN NORTH DAKOTA AND NORTHERN MINNESOTA.  THE PROGRESSIVE
NATURE OF THE SYSTEM ALONG WITH MARGINAL BOUNDARY LAYER
TEMPERATURES SHOULD LIMIT ACCUMULATIONS TO AN INCH OR
TWO...HOWEVER HEAVIER AMOUNTS CANNOT BE COMPLETELY DISCOUNTED WITH
WPC PROBABILISTIC GUIDANCE INDICATING A SLIGHT RISK FOR LOCAL
AMOUNTS OF 4-INCHES OR MORE.

THE PROBABILITY OF SIGNIFICANT ICING IS LESS THAN 10 PERCENT.

PEREIRA/KREKELER

$$





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