Area Forecast Discussion
Issued by NWS Portland, ME

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FXUS61 KGYX 231355 AAA
AFDGYX

AREA FORECAST DISCUSSION...UPDATED
NATIONAL WEATHER SERVICE GRAY ME
955 AM EDT SAT AUG 23 2014

.SYNOPSIS...
HIGH PRESSURE WILL BUILD SOUTH FROM CANADA TODAY THROUGH SUNDAY
AND WILL SETTLE OFF THE SOUTHERN NEW ENGLAND COAST MONDAY THROUGH
WEDNESDAY. A COLD FRONT WILL APPROACH FROM THE NORTH WEDNESDAY
NIGHT AND WILL STALL OVER SOUTHERN QUEBEC ON THURSDAY. LOW
PRESSURE WILL TRACK NORTHEAST ALONG THIS BOUNDARY THURSDAY NIGHT
AND WILL SWING A TRAILING COLD FRONT THROUGH THE REGION ON FRIDAY.

&&

.NEAR TERM /UNTIL 6 PM THIS EVENING/...
UPDATE...MOSTLY MINOR CHANGES TO THE CURRENT FORECAST TO ACCOUNT
FOR LATEST TRENDS IN TEMPS AND SKY COVER. MID LEVEL STRATUS
CONTINUES TO ERODE AND MOVE SWWD WITH TIME. LARGE BREAKS IN CLOUD
COVER WILL SUPPORT WIDESPREAD DIURNAL CU BUILDING OVER THE NEXT
COUPLE OF HOURS. STILL EXPECTING SCT SHOWERS TO FORM WITHIN THE
NE FLOW...ESPECIALLY WHERE HEATING CAN BE MAXIMIZED.

&&

.SHORT TERM /6 PM THIS EVENING THROUGH 6 PM SUNDAY/...
SKIES SHOULD CLEAR OUT TONIGHT ALLOWING FOR GOOD RADIATIONAL
COOLING CONDITIONS. OVERNIGHT LOWS WILL DROP INTO THE UPPER 40S TO
MID 50S. WARMER AIR ARRIVES SUNDAY WITH THE CENTER OF HIGH
PRESSURE...AND MODELS ARE SHOWING 12-14 DEGREES C AT 850 MB. THIS
SHOULD TRANSLATE TO LOWER 80S AREAWIDE. LOCATIONS ON THE COAST MAY
BE A COUPLE DEGREES COOLER THANKS TO THE SEABREEZE. SHOWERS WILL
LIKELY BE SUPPRESSED THANKS TO SUBSIDENCE FROM HIGH PRESSURE.

&&

.LONG TERM /SUNDAY NIGHT THROUGH FRIDAY/...
HIGH PRESSURE SETTLING SOUTH OVER SOUTHERN NEW ENGLAND SUNDAY
NIGHT WILL SET THE STAGE FOR THE RETURN OF SUMMER TEMPERATURES
TO THE REGION FOR MUCH OF THE COMING WEEK. WARM SOUTHWEST FLOW
WILL PUSH TEMPS INTO THE UPPER 70S TO LOWER 80S ACROSS MUCH OF
THE REGION ON MONDAY AND INTO THE LOW TO MID 80S ON TUESDAY.
BOTH DAYS WILL FEATURE PLENTY OF SUN.

SUMMER WEATHER WILL CONTINUE ON WEDNESDAY BUT A COLD FRONT SAGGING
SOUTH FROM CANADA WILL BRING INCREASING CLOUDS TO NORTHERN ZONES
AND A CHANCE OF AFTERNOON SHOWERS OR THUNDERSTORMS IN NORTHERN AND
CENTRAL AREAS. ONLY MARGINAL INSTABILITY EXPECTED TO EDGE SOUTH
INTO CENTRAL PORTIONS OF MAINE AND NEW HAMPSHIRE SO NOT LOOKING
FOR ANY WIDESPREAD ACTIVITY THERE. BEST CHANCE FOR CONVECTION WILL
BE IN FAR NORTHERN ZONES HOWEVER BEST INSTABILITY DOES REMAIN
NORTH OF THE BORDER.

COLD FRONT WILL HANG UP OVER SOUTHERN QUEBEC WEDNESDAY NIGHT AS
LOW PRESSURE TRACKS NORTHEAST ALONG IT FROM THE NORTHERN GREAT LAKES.
THIS WILL LIFT THE FRONTAL BOUNDARY NORTHWARD OVERNIGHT AND
DURING THE DAY ON THURSDAY. ENTIRE FORECAST AREA WILL SEE A CHANCE
OF SHOWERS AND THUNDERSTORMS IN THE WARM SECTOR ON THURSDAY WITH
NORTHERN ZONES ONCE AGAIN SEEING THE BEST CHANCE OF PRECIP. SHOULD
BE A HOT AND STEAMY DAY WITH HIGHS RANGING THROUGH THE 80S.

LOW PRESSURE LIFTING NORTHEAST INTO NORTHERN QUEBEC THURSDAY NIGHT
WILL DRIVE A COLD FRONT TOWARDS THE REGION. FRIDAY LOOKING TO BE
AN ACTIVE DAY FOR CONVECTION AS THE COLD FRONT PUSHES IN FROM THE
WEST DURING PRIME AFTERNOON HEATING. INCREASING SHEAR WILL LIKELY
RESULT IN STRONG TO SEVERE AFTERNOON AND EVENING THUNDERSTORMS IF
CURRENT TIMING HOLDS.

&&

.AVIATION /14Z SATURDAY THROUGH WEDNESDAY/...
SHORT TERM...REMAINING VALLEY FOG WILL LIFT WITHIN THE NEXT HOUR.
OTHERWISE EXPECT MAINLY VFR CONDITIONS TODAY. SCT SHRA ACROSS THE
INTERIOR COULD BRING BRIEF LOCAL MVFR CONDITIONS THIS AFTERNOON.
CLEARING SKIES TONIGHT WILL BRING ANOTHER ROUND OF VALLEY
FOG...WITH AREAS OF IFR OR LOWER IMPACTS.

LONG TERM...VFR SUNDAY NIGHT THROUGH WEDNESDAY.

&&

.MARINE...
SHORT TERM...NO PROBLEMS NOTED.

LONG TERM...NO PROBLEMS NOTED.

&&

.GYX WATCHES/WARNINGS/ADVISORIES...
ME...NONE.
NH...NONE.
MARINE...NONE.

&&

$$

NEAR TERM...LEGRO


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