Quantitative Precipitation Forecast
Issued by NWS

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FOUS11 KWBC 220847
QPFHSD

PROBABILISTIC HEAVY SNOW AND ICING DISCUSSION
NWS WEATHER PREDICTION CENTER COLLEGE PARK MD
447 AM EDT WED MAR 22 2017

VALID 12Z WED MAR 22 2017 - 12Z SAT MAR 25 2017


...WESTERN U.S....

A SPLIT FLOW PATTERN IS EXPECTED TO DEVELOP ACROSS THE WESTERN
U.S. THIS PERIOD...WITH AN AMPLIFYING SOUTHERN STREAM TROUGH
MOVING ACROSS CA LATE WED-EARLY THU.  STRONG ASCENT AFFORDED BY
MID LEVEL ENERGY LIFTING ALONG THE LEADING EDGE OF THE
TROUGH...ALONG WITH A COUPLING OF THE UPPER JET AND LOW-MID LEVEL
FRONTOGENESIS IS EXPECTED TO SUPPORT MODERATE TO HEAVY SNOWS ALONG
THE WASATCH AND UNITAS OF UT INTO THE NORTHWESTERN AND
NORTH-CENTRAL RANGES OF WY...INCLUDING THE TETON...WIND RIVER AND
BIG HORN RANGES...WED NIGHT-THU MORNING.  BY THU AFTERNOON EXPECT
THE MODERATE TO HEAVY SNOW THREAT TO SPREAD FURTHER EAST INTO
WESTERN CO...INCLUDING THE SAN JUANS.

AN UPPER LOW CLOSING OFF OVER THE FOUR CORNERS REGION LATE THU IS
FORECAST TO MOVE ACROSS THE CENTRAL ROCKIES INTO THE HIGH PLAINS.
MODERATE TO HEAVY SNOWS ARE EXPECTED TO SPREAD EAST OF THE DIVIDE
ON FRI...WITH STRONG NORTHEASTERLY LOW LEVEL FLOW TO THE NORTH OF
A STRONG LEE SIDE LOW SUPPORTING THE DEVELOPMENT OF HEAVY SNOWS
ALONG THE CO FRONT RANGE.  SNOWS ARE EXPECTED TO PERSIST INTO LATE
FRI BEFORE THE LOW TRACKS FURTHER TO THE EAST OUT INTO THE CENTRAL
PLAINS.

BACK TO THE WEST...THE THREAT FOR HEAVY SNOW IS EXPECTED TO RETURN
TO THE PACIFIC NORTHWEST AND NORTHERN CA AS ANOTHER AMPLIFIED
TROUGH MOVES INTO THE REGION ON FRI.  SOME OF THE HIGHER
PROBABILITIES FOR HEAVY ACCUMULATIONS CENTER ALONG THE NORTHWEST
CA RANGES INTO THE NORTHERN SIERRA...WHERE A MID-LEVEL SHORTWAVE
MOVING THROUGH THE BASE OF THE TROUGH INTERACTING WITH DEEP
SOUTHWESTERLY INFLOW MAY SUPPORT HEAVY SNOWS.

THE PROBABILITY OF ICE ACCUMULATIONS OF 0.25 INCH OR MORE IS LESS
THAN 10 PERCENT.

...NORTHERN NEW ENGLAND...

A SHORTWAVE MOVING THROUGH THE  BASE OF A BROADER SCALE TROUGH IS
EXPECTED TO AMPLIFY AS IT MOVES ACROSS THE NORTHEAST WED MORNING.
SURFACE LOW PRESSURE MOVING OUT OF SOUTHERN QUEBEC IS EXPECTED TO
STRENGTHEN AS IT TRACKS ACROSS THE NORTHERN GULF OF MAINE/BAY OF
FUNDY INTO THE CANADIAN MARITIMES.  THIS IS EXPECTED TO SPREAD
SOME LIGHT TO MODERATE SNOWS ACROSS EASTERN MAINE...PRODUCING A
SLIGHT CHANCE FOR ACCUMULATIONS OF 4-INCHES ALONG THE EASTERN
MAINE BORDER DURING THE DAY 1 PERIOD (ENDING 12 UTC THU).

THE PROBABILITY OF ICE ACCUMULATIONS OF 0.25 INCH OR MORE IS LESS
THAN 10 PERCENT.

PEREIRA

$$





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