Prognostic Meteorological Discussion
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FXUS01 KWBC 222010
PMDSPD

SHORT RANGE FORECAST DISCUSSION
NWS WEATHER PREDICTION CENTER COLLEGE PARK MD
310 PM EST MON JAN 22 2018

VALID 00Z TUE JAN 23 2018 - 00Z THU JAN 25 2018

...HEAVY SNOW AND RAIN OVER PARTS OF MAINE...

...HEAVY SNOW OVER THE CASCADES, SHASTA, AND NORTHERN ROCKIES...

...RAIN/FREEZING RAIN POSSIBLE OVER PARTS OF NORTHERN NEW ENGLAND
INTO PARTS OF THE UPPER GREAT LAKES...

...HEAVY RAIN POSSIBLE OVER THE PACIFIC NORTHWEST...

A STORM OVER PARTS OF THE UPPER/MIDDLE MISSISSIPPI VALLEY WILL
MOVE NORTHEASTWARD TO SOUTHEASTERN CANADA BY WEDNESDAY.  THE
SYSTEM WILL PRODUCE SNOW OVER PARTS OF THE CENTRAL PLAINS AND
MIDDLE/UPPER MISSISSIPPI VALLEY INTO THE UPPER GREAT LAKES AND
OVER NORTHERN NEW ENGLAND THAT WILL END OVER THE CENTRAL PLAINS
EARLY TUESDAY MORNING.  THE SNOW WILL BRIEFLY END OVER NORTHERN
MAINE ON TUESDAY AFTERNOON RETURNING OVERNIGHT TUESDAY INTO
WEDNESDAY.  ALSO ON TUESDAY AFTERNOON, SNOW WILL START OVER PARTS
OF THE OHIO VALLEY AND THE HIGHER ELEVATIONS OF THE CENTRAL
APPALACHIANS AS WELL AS PARTS OF THE NORTHERN MID-ATLANTIC BY
TUESDAY EVENING.  ADDITIONALLY, THE SNOW WILL WIND DOWN OVER PARTS
OF THE UPPER GREAT LAKES BY TUESDAY EVENING WHILE CHANGING OVER TO
ALL SNOW OVER THE OHIO VALLEY.  BY WEDNESDAY MORNING, SNOW WILL
EXTEND FROM PARTS OF THE NORTHEAST INTO PARTS OF THE EASTERN OHIO
VALLEY AND CENTRAL APPALACHIANS.

RAIN WILL ALSO DEVELOP OVER PARTS OF THE MIDDLE MISSISSIPPI
VALLEY/GREAT LAKES INTO NEW ENGLAND THAT WILL CONTINUE OVER PARTS
OF THE GREAT LAKES/OHIO VALLEY INTO THE NORTHEAST THROUGH TUESDAY
MORNING.  THE RAIN OVER THE SOUTHERN OHIO VALLEY WILL CHANGE OVER
TO SNOW BY TUESDAY EVENING.  THE RAIN WILL ALSO MOVE OFF THE NEW
ENGLAND COAST OVERNIGHT TUESDAY.  IN THE TRANSITION ZONE BETWEEN
THE RAIN AND SNOW, BANDS OF RAIN/FREEZING RAIN WILL DEVELOP OVER
PARTS OF THE GREAT LAKES INTO NEW ENGLAND THAT WILL END OVER THE
GREAT LAKES BY TUESDAY AFTERNOON AND NEW ENGLAND OVERNIGHT
TUESDAY.  FURTHERMORE, SHOWERS AND THUNDERSTORMS WILL DEVELOP
ALONG AND AHEAD OF THE ASSOCIATED FRONT FROM PARTS OF THE OHIO
VALLEY SOUTHWARD TO THE EASTERN GULF COAST BY MONDAY EVENING THAT
WILL MOVE EASTWARD TO THE MID-ATLANTIC SOUTHWARD TO THE SOUTHEAST
BY TUESDAY MORNING.  THE SHOWERS AND THUNDERSTORMS WILL MOVE OFF
THE EASTERN SEABOARD BY TUESDAY EVENING.

MEANWHILE, UPPER-LEVEL ENERGY OVER THE NORTHERN ROCKIES WILL MOVE
EASTWARD TO THE NORTHERN/CENTRAL PLAINS BY TUESDAY EVENING.  THE
ENERGY WILL AID IN PRODUCING SNOW OVER PARTS OF NORTHERN
INTERMOUNTAIN REGION/NORTHERN ROCKIES THAT WILL SLOWLY DISSIPATE
BY TUESDAY MORNING.  A DEEP UPPER-LEVEL TROUGH OVER THE NORTHERN
PACIFIC WILL MOVE EASTWARD TO THE PACIFIC NORTHWEST AND NORTHERN
CALIFORNIA COAST BY WEDNESDAY MORNING.   A PLUME OF MOISTURE AHEAD
OF THE TROUGH WILL MOVE INTO PARTS OF THE PACIFIC NORTHWEST BY
TUESDAY MORNING AND INTO NORTHERN CALIFORNIA TUESDAY EVENING INTO
WEDNESDAY.  THE MOISTURE WILL AID IN PRODUCING COASTAL RAIN AND
HIGHER ELEVATION SNOW OVER PARTS OF THE PACIFIC NORTHWEST ON
TUESDAY MORNING THAT WILL MOVE INLAND TO THE NORTHERN
INTERMOUNTAIN REGION BY WEDNESDAY.   RAIN AND HIGHER ELEVATION
SNOW WILL ALSO MOVE INTO PARTS OF NORTHERN CALIFORNIA OVERNIGHT
TUESDAY INTO WEDNESDAY.


ZIEGENFELDER


GRAPHICS AVAILABLE AT
WWW.WPC.NCEP.NOAA.GOV/BASICWX/BASICWX_NDFD.PHP
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