Prognostic Meteorological Discussion
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209
FXUS01 KWBC 170749
PMDSPD

SHORT RANGE FORECAST DISCUSSION
NWS WEATHER PREDICTION CENTER COLLEGE PARK MD
248 AM EST WED JAN 17 2018

VALID 12Z WED JAN 17 2018 - 12Z FRI JAN 19 2018

...LIGHT TO MODERATE SNOW ACCUMULATIONS FOR PORTIONS OF THE
MID-ATLANTIC REGION AND NORTHERN NEW ENGLAND TODAY...

...BELOW AVERAGE TEMPERATURES FROM THE NORTHERN MID-ATLANTIC INTO
THE SOUTH...

...SIGNIFICANT WARM-UP FROM THE NORTH-CENTRAL U.S. INTO THE
CENTRAL PLAINS...

...A RETURN TO WET/WHITE ACROSS THE WESTERN U.S...

A STRONG COLD FRONT MOVING EAST INTO THE MID-ATLANTIC AND
SOUTHEAST EARLY THIS MORNING WILL HELP SET THE STAGE FOR
ACCUMULATING SNOW ACROSS SOUTH-CENTRAL VIRGINIA INTO CENTRAL NORTH
CAROLINA, EXTENDING ALL THE WAY TO THE COAST. RAIN WILL LIKELY BE
THE INITIAL PRECIPITATION TYPE ALONG THE EASTERN EDGES OF THE
PRECIPITATION SHIELD, BUT A TRANSITION TO ALL SNOW IS EXPECTED
DURING THE DAY TODAY AND TONIGHT ACROSS COASTAL NORTH CAROLINA.
TWO TO FOUR INCHES OF SNOW, LOCALLY HIGHER, IS EXPECTED FOR INLAND
LOCATIONS WHILE ONE TO TWO INCHES WILL BE POSSIBLE ALONG COASTAL
LOCATIONS ENDING THURSDAY MORNING.

TO THE NORTH, COASTAL RAIN FOR THE NORTHEAST WITH INLAND SNOW WILL
FALL FOR MUCH OF THE DAY TODAY WITH THE GREATEST POTENTIAL FOR
FOUR OR MORE INCHES OF SNOW EXTENDING FROM CENTRAL MASSACHUSETTS
INTO EASTERN MAINE BEFORE SNOW ENDS WITH THE DEPARTING SURFACE LOW
TONIGHT.

AS HIGH PRESSURE, CURRENTLY OVER THE SOUTH, MOVES EAST OVER THE
NEXT ONE TO TWO DAYS, WESTERLY TO SOUTHWESTERLY FLOW WILL DEVELOP
ACROSS THE MIDDLE OF THE NATION ALLOWING FOR A SIGNIFICANT
WARM-UP. HIGH TEMPERATURES WILL RISE INTO THE 30S AND EVEN LOWER
40S FOR THE DAKOTAS TODAY AND THURSDAY. IN FACT, FOR THURSDAY,
HIGH TEMPERATURES ARE FORECAST TO BE A GOOD 10 TO 25 DEGREES ABOVE
AVERAGE ACROSS A SIZABLE PORTION OF THE NATION EXTENDING FROM THE
CENTRAL/NORTHERN PLAINS INTO THE WESTERN U.S.

ACROSS THE WESTERN U.S., A RETURN TO A WET PATTERN IS EXPECTED TO
CLOSE OUT THE WEEK ALONG THE COAST WITH INLAND SNOW. LIGHT RAIN
AHEAD OF A WARM FRONT WILL MOVE INTO COASTAL OREGON AND WASHINGTON
EARLY TODAY, FOLLOWED BY HEAVIER RAIN TONIGHT TIED TO THE SYSTEM`S
COLD FRONT. RAIN WILL TRANSITION TO SNOW BEHIND THE COLD FRONT FOR
THE HIGHER TERRAIN WITH THE HEAVIEST ACCUMULATIONS IN THE NORTHERN
WASHINGTON CASCADES THROUGH THURSDAY MORNING.

OTTO


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