Prognostic Meteorological Discussion
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000
FXUS01 KWBC 120721
PMDSPD

SHORT RANGE FORECAST DISCUSSION
NWS WEATHER PREDICTION CENTER COLLEGE PARK MD
221 AM EST FRI FEB 12 2016

VALID 12Z FRI FEB 12 2016 - 12Z SUN FEB 14 2016

...LAKE EFFECT SNOWFALL TO CONTINUE DOWNWIND OF THE GREAT LAKES
FRIDAY INTO SATURDAY...

...THE COLDEST AIR MASS OF THE SEASON EXPECTED TO IMPACT EASTERN
U.S. THIS WEEKEND...

...RAIN AND SNOW EXPECTED TO SPREAD ACROSS THE NORTHWEST ON FRIDAY
AND INTO THE NORTHERN PLAINS AND THE UPPER MIDWEST BY SATURDAY...


A COLD FRONT SWEEPING ACROSS THE GREAT LAKES WILL CONTINUE TO
ALLOW FOR MODERATE TO LOCALLY HEAVY LAKE EFFECT SNOWFALL THE NEXT
FEW DAYS. AN ADDITIONAL 6 TO 10 INCHES OF SNOW MAY BE POSSIBLE IN
THE FAVORABLE DOWNWIND AREAS OF THE GREAT LAKES AS WESTERLY AND
NORTHWESTERLY FLOW ACROSS THE LAKES RESULTS IN VERY LOCALIZED
HEAVY SNOW BANDS. WINTER WEATHER ADVISORIES AND LAKE EFFECT SNOW
WARNINGS ARE IN EFFECT INTO SATURDAY.

AT THE SAME TIME, A WEAK AREA OF LOW PRESSURE WILL MOVE OFF THE
SOUTH CAROLINA COAST THIS MORNING WHICH IS EXPECTED TO BRING SOME
LIGHT SNOW OR FREEZING RAIN ACCUMULATIONS TO PORTIONS OF EASTERN
NORTH CAROLINA ON FRIDAY. THE LOW IS FORECAST TO MOVE WELL OFF THE
EASTERN U.S. COASTLINE, BUT MAY STILL CLIP COASTAL MAINE WITH UP
TO A FOOT OF SNOW.

STRONG SURFACE HIGH PRESSURE NUDGING INTO THE CENTRAL U.S. TODAY
WILL ALLOW FOR TEMPERATURES 10 TO 20 DEGREES COLDER THAN NORMAL TO
CONTINUE ACROSS THE NORTHERN PLAINS AND INTO THE MIDWEST. THE COLD
FRONT SWEEPING INTO THE GREAT LAKES HOWEVER, WILL USHER AN EVEN
COLDER AIRMASS INTO THE EASTERN U.S. BY SATURDAY. AFTERNOON HIGH
TEMPERATURES AS MUCH AS 20 TO 30 DEGREES BELOW NORMAL ARE LIKELY
ACROSS PORTIONS OF THE OHIO VALLEY, MID-ATLANTIC, AND THE
NORTHEAST THIS WEEKEND. A STRONG PRESSURE GRADIENT IN THE WAKE OF
THE LOW OFF THE NORTHEAST COAST WILL ALSO BRING GUSTY WINDS TO
THESE SAME AREAS WHICH COULD CREATE DANGEROUSLY COLD OVERNIGHT
WIND CHILLS.

A FRONTAL BOUNDARY MOVING INTO THE NORTHWEST TODAY WILL BRING
LOCALLY HEAVY RAIN AND HIGHER ELEVATION SNOWS TO THE PACIFIC
NORTHWEST AND PORTIONS OF THE INTERMOUNTAIN WEST THROUGHOUT THE
WEEKEND. AS THE UPPER LEVEL ENERGY MOVES INTO THE HIGH PLAINS
SATURDAY AFTERNOON, SNOW WILL SPREAD INTO THE NORTHERN PLAINS, AND
EVENTUALLY THE UPPER MIDWEST BY SUNDAY. RELATIVELY LIGHT
ACCUMULATIONS OF UP TO HALF A FOOT COULD BE POSSIBLE ACROSS THE
EASTERN DAKOTAS INTO PORTIONS OF WESTERN MINNESOTA.


SANTORELLI


GRAPHICS AVAILABLE AT WWW.WPC.NCEP.NOAA.GOV
$$




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