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Winter Weather Forecast Discussion
 
(Caution: Version displayed is not the latest version. - Issued 0819Z Apr 19, 2018)
 
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Abbreviations and acronyms used in this product
 
Geographic Boundaries -  Map 1: Color  Black/White       Map 2: Color  Black/White


PROBABILISTIC HEAVY SNOW AND ICING DISCUSSION
NWS WEATHER PREDICTION CENTER COLLEGE PARK MD
419 AM EDT THU APR 19 2018

VALID 12Z THU APR 19 2018 - 12Z SUN APR 22 2018


DAYS 1-3...

...GREAT BASIN/FOUR CORNERS AND CENTRAL TO SOUTHERN ROCKIES...

FORECAST REMAINS GENERALLY UNCHANGED...WITH LOCALLY HEAVY MOUNTAIN
SNOW ACCUMULATIONS LIKELY ACROSS PORTIONS OF CENTRAL ROCKIES AS A
UPPER LEVEL LOW ROLLS ACROSS THE REGION OVER THE NEXT TWO DAYS. 

AN UPPER LOW MOVING INTO CA THIS MORNING IS EXPECTED TO MOVE
ACROSS THE SIERRA INTO THE GREAT BASIN ON THU BEFORE REACHING THE
FOUR CORNERS REGION BY EARLY FRI.  MOISTURE WILL BE LIMITED AT
FIRST...HOWEVER STRONG DYNAMICS MAY BE ENOUGH TO PRODUCE SOME
LOCALLY SIGNIFICANT ACCUMULATIONS ACROSS PORTIONS OF THE SIERRA
AND THE CENTRAL NV RANGES.  BUT OVERALL...WIDESPREAD HEAVY
ACCUMULATIONS ARE NOT EXPECTED.  BY EARLY FRI...FAVORABLE DYNAMICS
ALONG THE LEFT-EXIT REGION OF A STRENGTHENING JET MAY BEGIN TO
SUPPORT SOME HEAVY ACCUMULATIONS FURTHER EAST ACROSS THE SAN JUANS.

ON FRI...THE POTENTIAL FOR MORE WIDESPREAD HEAVY ACCUMULATIONS IS
EXPECTED TO INCREASE ACROSS THE CENTRAL ROCKIES AS THE UPPER LOW
MOVES FURTHER EAST AND BEGINS TO INTERACT WITH DEEPER MOISTURE
SURGING NORTH THROUGH THE HIGH PLAINS.  WPC DAY 2 PROBABILITIES
(ENDING 12 UTC SAT) SHOW THE POTENTIAL FOR HEAVY MOUNTAIN SNOWS
ACROSS A LARGE EXTENT OF THE CENTRAL CO...NORTH-CENTRAL NM AND
SOUTHEASTERN WY RANGES.

SNOWS ARE EXPECTED TO QUICKLY DIMINISH BY EARLY SAT HOWEVER AS THE
UPPER LOW CONTINUES TO MOVE PROGRESSIVELY EAST ACROSS THE CENTRAL
AND SOUTHERN PLAINS.
 
FOR DAYS 1-3...THE PROBABILITY OF ICING GREATER THAN 0.25 INCHES
IS LESS THAN 10 PERCENT.

PEREIRA