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297
FOUS11 KWBC 191921
QPFHSD

PROBABILISTIC HEAVY SNOW AND ICING DISCUSSION
NWS WEATHER PREDICTION CENTER COLLEGE PARK MD
320 PM EDT SAT APR 19 2014

VALID 00Z SUN APR 20 2014 - 00Z WED APR 23 2014

...PACIFIC NORTHWEST...

MODELS ARE IN GOOD AGREEMENT WITH REGARDS TO A SHORTWAVE TROUGH
FORECAST TO MOVE ONSHORE TONIGHT.  POST-FRONTAL ONSHORE FLOW AND
MID-UPPER FORCING MIGHT AFFORD A BRIEF PERIOD OF HEAVY SNOW FOR
THE HIGHER PEAKS OF THE NORTHERN CASCADES TONIGHT-EARLY TOMORROW
BEFORE A SHORTWAVE RIDGE BUILDS OVER THE REGION LATER IN THE DAY.

MODELS ARE ALSO IN GOOD AGREEMENT WITH AN UPSTREAM TROUGH FORECAST
TO AMPLIFY AS IT MOVES INTO THE WEST ON TUE.  AS SNOW LEVELS
DECREASE BEHIND A STRONG COLD FRONT...ONSHORE FLOW AND FAVORABLE
UPPER JET FORCING WILL CONTRIBUTE TO A HEAVY SNOW THREAT ALONG THE
HIGHER PEAKS OF THE CASCADES AND THE SAWTOOTH FURTHER TO THE EAST.

THE PROBABILITY FOR SIGNIFICANT ICING IS LESS THAN 10 PERCENT.

PEREIRA


$$






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