Area Forecast Discussion
Issued by NWS Cleveland, OH

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000
FXUS61 KCLE 251721
AFDCLE

AREA FORECAST DISCUSSION
NATIONAL WEATHER SERVICE CLEVELAND OH
1221 PM EST THU DEC 25 2014

.SYNOPSIS...
LOW PRESSURE WILL BE PULLING NORTHEAST FROM ONTARIO INTO QUEBEC
TODAY. MEANWHILE HIGH PRESSURE WILL BUILD ACROSS THE OHIO AND
TENNESSEE VALLEYS. THIS WILL SHIFT EAST EARLY SATURDAY AND ALLOW A
COLD FRONT TO CROSS NORTHERN OHIO/PA SATURDAY EVENING. HIGH
PRESSURE RETURNS IN ITS WAKE FOR EARLY NEXT WEEK.

&&

.NEAR TERM /UNTIL 6 PM THIS EVENING/...
A FEW RAIN SHOWERS/DRIZZLE LOCATED ACROSS THE REGION...MAINLY FROM
THE CENTRAL HIGHLANDS EASTWARD INTO NW PA. CANT COMPLETELY RULE
OUT A FEW SNOW FLAKES BUT IT WONT BE MUCH. OTHERWISE IT LOOKS LIKE
WE MAY ATTEMPT TO SEE A FEW BREAKS OF CLOUDS FOR THE AFTERNOON.

PREVIOUS DISCUSSION...

REALLY NOT A LOT OF COLD AIR BEHIND YESTERDAYS COLD FRONT AND THE
MAJORITY OF THE PRECIP ON THE BACKSIDE PULLED UP THROUGH MI AND
INTO CANADA. THEREFORE NO WHITE CHRISTMAS. STILL A FEW RAIN
SHOWERS OUT THERE EARLY THIS MORNING WITH THE UPPER TROUGH. MAY
SEE SOME WET SNOWFLAKES MIX IN AND ALSO MAY JUST SEE SOME PLAIN
DRIZZLE. TEMPERATURES WILL REMAIN ABOVE FREEZING. THE
PRECIPITATION CHANCES REALLY CONFINED TO THIS MORNING AS WE
QUICKLY TRANSITION TO RIDGING AND WARM ADVECTION. HIGHS FOR TODAY
WILL BE PRETTY MUCH WHERE THEY ARE AT RIGHT NOW...UPPER 30S WITH A
FEW IN THE LOWER 40S. MOSTLY CLOUDY...BUT WILL BE OPTIMISTIC FOR
SOME BREAKS ACROSS SOUTHWEST COUNTIES BEFORE SUNSET.

&&

.SHORT TERM /6 PM THIS EVENING THROUGH SUNDAY NIGHT/...
DRY CONDITIONS FOR TONIGHT THROUGH FRIDAY WITH HIGH PRESSURE
BUILDING ACROSS THE OHIO VALLEY. STILL RELATIVELY MILD WITH NO
SOURCE OF COLD AIR WITH THE WEST-SOUTHWEST FLOW. A SHORTWAVE EMERGES
FROM THE ROCKIES LONGWAVE TROUGH FRIDAY NIGHT TOWARD THE GREAT
LAKES REGION. SURFACE LOW PRESSURE WILL TRACK ACROSS THE LAKES
INTO CANADA AND TAKE A COLD FRONT ACROSS OH/PA SATURDAY NIGHT. AS
IT DOES SO...THE FRONT WILL SLOW AND WEAKEN WHILE THE RIDGE ACROSS
THE SOUTHEAST STATES HOLDS AND ONLY FLATTENS WITH TIME. IT WILL
TAKE SOME TIME ON SATURDAY TO BE ABLE TO GET PRECIP INTO NW OHIO.
WILL FOCUS THE MAJORITY OF THE PRECIP CHANCES ON SATURDAY NIGHT.
TEMPERATURES WILL STILL BE MILD SO EXPECTING THE MAJORITY OF THE
PRECIP TO FALL AS RAIN WITH SOME SNOW CHANCES WITH THE ADVANCING
COLD AIR TOWARD SUNDAY MORNING. TEMPERATURES CLOSER TO NORMAL FOR
SUNDAY. WILL LINGER SNOW SHOWER CHANCES INTO SUNDAY BUT HIGH
BUILDING IN MAY END THAT ALL TOGETHER. WILL KEEP CLOUDS AROUND
SUNDAY NIGHT.

&&

.LONG TERM /MONDAY THROUGH WEDNESDAY/...
NEAR TO SLIGHTLY BELOW NORMAL TEMPERATURES FOR THE PERIOD WITH A
RIDGE BUILDING IN FROM THE NORTH. THE MODELS DISAGREE ON THE
MOISTURE. THE GFS IS VERY DRY FOR THE PERIOD WHILE THE ECMWF HAS
MUCH MORE MOISTURE FOR MONDAY THROUGH TUESDAY MORNING. BECAUSE OF
THAT KEPT CHANCE POPS FOR SNOW SHOWERS OVER NE OH AND NW PA AS THE
LAKE AND 850 MB TEMPERATURE DIFFERENCE WILL BE NEAR 16C. AS THE
RIDGE BUILDS IN LATER TUESDAY INTO WEDNESDAY THE FLOW BECOMES
SOUTHWEST SO WENT DRY ACROSS THE ENTIRE FORECAST AREA. WENT A LITTLE
COLDER THAN GUIDANCE MAINLY FOR THE HIGHS BASED ON THE FORECASTED
850 MB TEMPERATURES.

&&

.AVIATION /18Z THURSDAY THROUGH TUESDAY/...
FLOW IS BEGINNING TO SHIFT AROUND TO THE SOUTHWEST AT THIS TIME.
THIS WILL BEGIN A SLOW WARM AIR ADVECTION PATTERN INTO THE REGION
AS HIGH PRESSURE RIDGE BUILDS EAST. THIS SHOULD START TO BRING
SOME DRIER AIR INTO THE AREA ALLOWING LOW CLOUD DECK TO GRADUALLY
SHIFT EAST OF THE REGION. SO WILL BE IMPROVING CEILINGS WITH TIME
FROM WEST TO EAST THIS EVENING INTO TONIGHT. WINDS WILL DIMINISH
AS WELL AS GRADIENT WEAKENS THIS AFTERNOON AND EVENING.

.OUTLOOK...NON-VFR LATE SATURDAY THROUGH SUNDAY NIGHT AND THEN
MAINLY OVER NE OH AND NW PA MONDAY THROUGH TUESDAY.

&&

.MARINE...
GALE WARNINGS HAVE BEEN DISCONTINUED. WINDS HAVE DIMINISHED BELOW
GALE FORCE ACROSS MUCH OF THE LAKE SO WILL GO AHEAD AND DROP THE
WARNING. WATER LEVELS ON THE WEST END HAVE RISEN ABOVE THE
CRITICAL MARK SO WILL GO AHEAD AND DROP THE LOW WATER ADVISORY.
SINCE WAVES WILL REMAIN WELL ABOVE 4 FEET WILL HOIST AND EXTEND
SMALL CRAFT ADVISORY THROUGH TOMORROW AFTERNOON.

PREVIOUS DISCUSSION...
GALE FORCE WINDS WILL DIMINISH SOMEWHAT QUICKLY FROM THE WEST
TODAY AS WARM ADVECTION WILL BE STARTING AROUND DAYBREAK. WILL
DOWNGRADE THE GALE ON THE WEST END OF THE LAKE TO A SMALL CRAFT
ADVISORY FOR 20 TO 25 KNOT WINDS THROUGH MID AFTERNOON. ON THE
EAST END CONTINUING THE GALE THROUGH 21Z/4PM TODAY AND THEN A
SMALL CRAFT ADVISORY WILL BE NEEDED AFTER THAT. THE FLOW ON THE
LAKE WILL BECOME SOUTHWEST TODAY AS A RIDGE BUILDS INTO THE OHIO
VALLEY. ON FRIDAY SOME QUESTION HOW STRONG THE SOUTHWEST WINDS
WILL BE AND WHETHER A SMALL CRAFT ADVISORY WILL BE
NEEDED...ESPECIALLY ON THE EAST END.

THE WATER LEVEL HAS DROPPED BELOW THE CRITICAL MARK. SOME QUESTION
HOW LOW WILL IT GET WITH THE WINDS NOT THAT STRONG ON THE WEST END.
WILL NOT LET IT DROP BELOW 2 FEET BELOW THE CRITICAL MARK AND
THEN IT SHOULD SLOSH BACK ABOVE THE CRITICAL MARK BY NOON.

A FRONT WILL MOVE ACROSS THE LAKE LATE SATURDAY PROMPTING YET
ANOTHER THREAT FOR A SMALL CRAFT ADVISORY ON THE EAST END. BY SUNDAY
MORNING A RIDGE WILL BE OVER THE LAKE AND THE WINDS WILL DECREASE.
THE RIDGE WILL BE IN CONTROL OF THE WEATHER THROUGH TUESDAY...THUS
NOT EXPECTING THE NEED FOR A SMALL CRAFT ADVISORY.

&&

.CLE WATCHES/WARNINGS/ADVISORIES...
OH...NONE.
PA...NONE.
MARINE...SMALL CRAFT ADVISORY UNTIL 1 PM EST FRIDAY FOR LEZ142>149.

&&

$$
SYNOPSIS...OUDEMAN
NEAR TERM...MULLEN/OUDEMAN
SHORT TERM...OUDEMAN
LONG TERM...KIELTYKA
AVIATION...LOMBARDY
MARINE...KIELTYKA/LOMBARDY






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