Prognostic Meteorological Discussion
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607
FXUS01 KWBC 061946
PMDSPD

SHORT RANGE FORECAST DISCUSSION
NWS WEATHER PREDICTION CENTER COLLEGE PARK MD
246 PM EST TUE DEC 06 2016

VALID 00Z WED DEC 07 2016 - 00Z FRI DEC 09 2016

...SNOW TO CONTINUE ACROSS PORTIONS OF THE NORTHERN PLAINS AND
UPPER MIDWEST...

...HEAVY RAIN AND SNOW TO SPREAD ACROSS THE WEST ON THURSDAY...

...ARCTIC AIR WILL BRING WELL BELOW AVERAGE TEMPERATURES TO THE
PLAINS AND MISSISSIPPI VALLEY MID-WEEK...

BEGINNING IN THE EAST: TWO SYSTEMS ARE DOMINATING THE PATTERN
RIGHT NOW FOR THE EASTERN HALF OF THE U.S.  A SURFACE LOW IS
MOVING FROM THE SOUTHEAST INTO THE CAROLINAS TODAY--AND WILL MOVE
OVER THE ATLANTIC BY LATE TUESDAY NIGHT.  THIS SYSTEM WILL BRING
SHOWERS AND THUNDERSTORMS ACROSS THE SOUTHEAST, FLORIDA, AND THE
MID-ATLANTIC FOR THE REST OF THE DAY.  BY EARLY WEDNESDAY MORNING,
MOST OF THE SHOWERS AND THUNDERSTORMS WILL BE CONFINED TO SOUTH
FLORIDA AS THE FRONT STALLS ACROSS THAT REGION. IN FACT, EXPECT
SHOWERS AND THUNDERSTORMS TO LINGER ACROSS THIS AREA THROUGH
FRIDAY. THE PRIMARY SURFACE LOW WILL CONTINUE MOVING NORTH ALONG
THE EAST COAST AND WILL BRING LIGHTER PRECIPITATION ACROSS THE
NORTHEAST.  FARTHER WEST, A DEEPENING OCCLUDED SYSTEM WILL TRACK
NORTHEAST OVER THE GREAT LAKES.  PRECIPITATION WRAPPING AROUND THE
SURFACE LOW WILL BRING SNOWFALL TO THE NORTHERN PLAINS THE REST OF
TUESDAY--AND WITH IT BLIZZARD CONDITIONS AS STRONG WINDS BEHIND
THE SYSTEM ARE ALSO EXPECTED.  THESE BLIZZARD CONDITIONS SHOULD
END BY THIS EVENING.  SNOW WILL TAPER OFF BY LATE TUESDAY NIGHT
AND BEGIN TO SPREAD ACROSS THE UPPER MIDWEST ON WEDNESDAY.  BY
THURSDAY, THE LOW WILL BE MOVING INTO QUEBEC; HOWEVER, STRONG
NORTHWESTERLY WINDS WILL CREATE A GOOD SET UP FOR LAKE EFFECT
SNOW.  EXPECT LOCALLY HEAVY SNOWFALL AMOUNTS FOR BOTH THE UPPER
AND LOWER GREAT LAKES.

LOOKING WEST, LIGHT PRECIPITATION WILL MOVE ACROSS THE CENTRAL
GREAT BASIN AND CENTRAL ROCKIES TODAY THROUGH WEDNESDAY--WITH
HIGHER ELEVATIONS RECEIVING SNOW.  BY WEDNESDAY EVENING, MOST OF
THE PRECIPITATION WILL DISSIPATE OVER THESE REGIONS BEFORE THE
NEXT INCOMING PACIFIC SYSTEM.  ON THURSDAY MORNING, AN OCCLUDED
FRONT WILL APPROACH THE NORTHERN CALIFORNIA COASTLINE--WITH
PRECIPITATION SPREADING ACROSS NORTHERN CALIFORNIA, OREGON, AND
THE CENTRAL GREAT BASIN.  IN FACT, THE AMOUNT AND COVERAGE OF
PRECIPITATION WILL CONTINUE INCREASING THROUGH THURSDAY NIGHT AS
THE FRONT CONTINUES TO APPROACH THE COAST.  SNOWFALL ALONG THE
HIGHER ELEVATIONS OF THE CASCADES AND THE NORTHERN/CENTRAL ROCKIES
IS EXPECTED ON THURSDAY AND INTO FRIDAY.

AN ARCTIC HIGH PRESSURE WILL SPILL ACROSS THE NORTH AND CENTRAL
PLAINS ON TUESDAY/WEDNESDAY--AND WILL CONTINUE TO BRING VERY COLD
TEMPERATURES ACROSS THE SOUTHERN PLAINS AND MISSISSIPPI VALLEY BY
THURSDAY.  TEMPERATURES ARE EXPECTED TO BE 10-25 DEGREES BELOW
NORMAL FOR THIS TIME OF YEAR.


FANNING


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