Prognostic Meteorological Discussion
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410
FXUS01 KWBC 110758
PMDSPD

SHORT RANGE FORECAST DISCUSSION
NWS WEATHER PREDICTION CENTER COLLEGE PARK MD
258 AM EST MON DEC 11 2017

VALID 12Z MON DEC 11 2017 - 12Z WED DEC 13 2017

...CRITICAL FIRE WEATHER CONDITIONS PERSISTING ACROSS SOUTHERN
CALIFORNIA...

...LOCALLY HEAVY LAKE EFFECT SNOWFALL TO CONTINUE DOWNWIND OF THE
GREAT LAKES THROUGH WEDNESDAY MORNING...

...COASTAL STORM TO BRING SNOWY CONDITIONS TO PORTIONS OF THE
NORTHEAST ON TUESDAY...

HIGH PRESSURE OVER THE WEST WILL BEGIN TO WEAKEN THIS WEEK AS THE
UPPER LEVEL PATTERN BEGINS TO UNDERGO A TRANSITION. HOWEVER, DRY
CONDITIONS WITH ABOVE NORMAL TEMPERATURES WILL CONTINUE ACROSS
MUCH OF THE WESTERN/SOUTHWESTERN U.S. INTO THE CENTRAL GREAT
PLAINS. STRONG, GUSTY SANTA ANA WINDS WILL CONTINUE IN SOUTHERN
CALIFORNIA AND WHILE WIND GUSTS ARE EXPECTED TO WEAKEN BY
MID-WEEK, ELEVATED FIRE WEATHER CONCERNS WILL LINGER ACROSS
SOUTHERN CALIFORNIA FOR ANOTHER COUPLE OF DAYS.

A CLIPPER SYSTEM WILL TRACK FROM THE UPPER MISSISSIPPI RIVER
VALLEY INTO THE GREAT LAKES REGION TODAY AND TONIGHT BRINGING
LIGHT SNOW AND A RENEWED SURGE OF COLDER TEMPERATURES. HIGH
TEMPERATURES ON TUESDAY ARE ONLY EXPECTED TO BE IN THE TEENS FOR
WISCONSIN AND LOWER MICHIGAN WHICH IS ABOUT 10 TO 15 DEGREES BELOW
AVERAGE. IN ADDITION, NORTHWESTERLY WINDS IN THE WAKE OF THE
CLIPPER SYSTEM WILL SET UP LOCALLY HEAVY LAKE EFFECT SNOW DOWNWIND
OF LAKES SUPERIOR AND MICHIGAN.

AS THE STORM SYSTEM TRACKS TOWARD THE NORTHEAST ON TUESDAY, LIGHT
TO MODERATE SNOW WILL OVERSPREAD UPSTATE NEW YORK INTO INTERIOR
NEW ENGLAND INTO THE EARLY AFTERNOON. THE SURFACE LOW IS EXPECTED
TO STRENGTHEN INTO TUESDAY NIGHT AS IT TRACKS THROUGH MAINE. WHILE
THERE IS STILL SOME UNCERTAINTY WITH THE DETAILS, RAIN OR A WINTRY
MIX IS EXPECTED OVER PORTIONS OF SOUTHERN NEW ENGLAND AS WELL
PORTIONS OF NEW HAMPSHIRE AND MAINE WITH THE GREATER SNOW
ACCUMULATIONS STAYING INLAND AND INTO THE HIGHER TERRAIN.

OTTO

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





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