Prognostic Meteorological Discussion
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FXUS01 KWBC 230800
PMDSPD

SHORT RANGE FORECAST DISCUSSION
NWS WEATHER PREDICTION CENTER COLLEGE PARK MD
259 AM EST TUE JAN 23 2018

VALID 12Z TUE JAN 23 2018 - 12Z THU JAN 25 2018

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

...HEAVY SNOW OVER THE CASCADES, NORTHERN SIERRA NEVADAS, BLUE
MOUNTAINS, BITTERROOTS 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...

THE WINTER STORM THAT BROUGHT WIDESPREAD SNOW AND FREEZING RAIN TO
THE CENTRAL/NORTHERN PLAINS AND UPPER MISSISSIPPI VALLEY ON MONDAY
WILL CONTINUE TO LIFT NORTHEAST THROUGH THE LOWER GREAT LAKES
TODAY AND EXITING NEW ENGLAND BY VERY EARLY ON WEDNESDAY.
PRECIPITATION MAY GO THROUGH A BRIEF TRANSITION PERIOD WHERE
FREEZING RAIN WILL OCCUR THIS AFTERNOON; BUT WILL CHANGE OVER TO
ALL SNOW AS IT CONTINUES ACROSS PORTIONS OF THE GREAT LAKES REGION
AND THE NORTHEAST THROUGH WEDNESDAY. WINTER WEATHER ADVISORIES AND
WINTER STORM WARNINGS REMAIN IN EFFECT FOR PARTS OF THE GREAT
LAKES REGION AND MUCH OF NEW ENGLAND. ADDITIONALLY, AS THE
ASSOCIATED COLD FRONT PASSES THROUGH THE OHIO VALLEY, SNOW WILL
WILL DEVELOP AND SPREAD TO THE HIGHER ELEVATIONS OF THE CENTRAL
APPALACHIANS, AS WELL AS, PARTS OF THE NORTHERN MID-ATLANTIC BY
LATE AFTERNOON/EVENING.

SHOWERS AND THUNDERSTORMS HAVE DEVELOPED ALONG AND AHEAD OF THE
TRAILING FRONT AND ARE SPREADING EASTWARD TOWARD THE MID-ATLANTIC
AND SOUTHEAST. THE SHOWERS AND THUNDERSTORMS ARE EXPECTED TO EXIT
THE EASTERN SEABOARD TONIGHT.

THE PACIFIC NORTHEAST AND NORTHERN CALIFORNIA WILL REMAIN IN A
PERSISTENT WET PATTERN AS UPPER-LEVEL ENERGY AND ONSHORE FLOW
SPREADS RAIN AND MOUNTAIN SNOW ACROSS THE REGION. A PLUME OF
MOISTURE AHEAD OF AN UPPER-LEVEL TROUGH WILL MOVE INTO PARTS OF
THE PACIFIC NORTHWEST TODAY AND WILL EXPAND SOUTH INTO NORTHERN
CALIFORNIA TONIGHT AND WEDNESDAY.  COASTAL RAIN AND HIGHER
ELEVATION SNOW IS FORECAST FOR MUCH OF NORTHWEST TODAY AND FOR TO
THE NORTHERN INTERMOUNTAIN REGION BY WEDNESDAY. SNOW WILL BE HEAVY
FOR MOST OF THE CASCADES, NORTHERN PORTIONS OF THE SIERRAS
NEVADAS, THE BLUE MOUNTAINS, THE BITTERROOTS AND THE NORTHERN
ROCKIES IN THIS SETUP.


CAMPBELL


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





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