Area Forecast Discussion
Issued by NWS Caribou, ME

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FXUS61 KCAR 010218
AFDCAR

AREA FORECAST DISCUSSION
NATIONAL WEATHER SERVICE CARIBOU ME
1018 PM EDT FRI JUL 31 2015

.SYNOPSIS...
A WEAK RIDGE OF HIGH PRESSURE WILL BUILD ACROSS THE AREA OVERNIGHT.
UPPER LEVEL DISTURBANCES CROSSING THE REGION WILL KEEP UNSETTLED
CONDITIONS THROUGH THE WEEKEND WITH SCATTERED SHOWERS AND
THUNDERSTORMS.
&&

.NEAR TERM /THROUGH SATURDAY/...
UPDATE...
SKIES ARE CURRENTLY MOSTLY CLEAR ACROSS THE FORECAST AREA...WITH
AN AREA OF CLOUDS MOVING EAST ACROSS QUEBEC PROVINCE FROM
WEAKENING CONVECTION WITH AN APPROACHING UPPER LEVEL DISTURBANCE.
SURFACE HIGH PRESSURE WILL BRIEFLY BUILD ACROSS THE REGION
OVERNIGHT...WHILE THE UPPER LEVEL DISTURBANCE BEGINS TO APPROACH
LATE. GENERALLY EXPECT PARTLY CLOUDY/MOSTLY CLEAR SKIES ACROSS
NORTHERN PORTIONS OF THE FORECAST AREA OVERNIGHT...THOUGH CLOUD
COVER WILL BEGIN TO INCREASE ACROSS NORTHWEST AREAS LATE IN
ADVANCE OF THE APPROACHING UPPER DISTURBANCE. MOSTLY CLEAR SKIES
WILL OCCUR ACROSS THE REST OF THE FORECAST AREA OVERNIGHT.
OVERNIGHT LOW TEMPERATURES WILL RANGE FROM THE UPPER 50S TO AROUND
60 ACROSS THE FORECAST AREA. HAVE UPDATED THE FORECAST TO ADJUST
FOR CURRENT CONDITIONS ALONG WITH EXPECTED OVERNIGHT TEMPERATURES
AND CLOUD COVER.

PREVIOUS DISCUSSION...
THE FOCUS FOR TOMORROW BECOMES UPPER TROUGH/COLD FRONTAL PASSAGE.
EXPECT SHOWERS AND THUNDERSTORMS TO DEVELOP ALONG AND JUST AHEAD
OF THE SURFACE FRONT/WIND SHIFT LINE EARLY IN THE AFTERNOON AND
THEN SHIFT SOUTHEAST THROUGH THE EVENING HOURS. IT LOOKS LIKE
THINGS SHOULD FIRE UP A LITTLE EARLIER THAN PREVIOUSLY
ANTICIPATED, WITH SHOWERS AND THUNDERSTORMS MOVING INTO THE FAR
NORTHWEST BY EARLY AFTERNOON AND INTO INTERIOR DOWNEAST BY EARLY
EVENING. 0-6KM SHEAR LOOKS GOOD AT 40-45 KT, ALONG WITH MID-LEVEL
LAPSE RATES 5.5-6.5 C/KM. ALTHOUGH SOME OF THE MODELS INDICATE SB
CAPES OF 1100+J/KG, THIS IS LIKELY OVERDONE AND THE MORE MODEST
600-1000 J/KG SEEMS MORE REASONABLE. THIS ALONG WITH A DRY LAYER
ALOFT COULD SERVE TO LIMIT SEVERE POTENTIAL. THE BIGGEST THREAT
WOULD BE HAIL GIVEN THE COLD AIR ALOFT, THOUGH GUSTY WINDS WILL BE
POSSIBLE IN ANY STORMS THAT ARE ABLE TO TAP THE STRONGER WINDS
ALOFT. THIS THINKING FOLLOWS CLOSELY WITH SPC, WHICH HAS CONTINUED
TO INCLUDE ALL OF INTERIOR MAINE IN A MARGINAL SEVERE RISK IN
THEIR LATEST DAY 2 OUTLOOK. HAVE THEREFORE KEPT ENHANCED WORDING
IN TOMORROW`S FORECAST.
&&

.SHORT TERM /SATURDAY NIGHT THROUGH MONDAY/...
UNSETTLED WEATHER WILL CONTINUE ACROSS PINE TREE STATE...WITH A
WEAK SHORTWAVE AFFECTING OUR CWA ON SUNDAY...AND THEN A STRONG
UPPER LOW SWINGING EWD ACROSS NEW ENGLAND. THE FEATURES WILL
PRODUCE THEIR OWN ROUND OF SHOWERS AND TSTORMS...WITH THE SECOND
HAVING MORE WIDESPREAD AND HEAVIER PRECIP. TEMPERATURES WILL BE
SEASONABLY WARM WITH HIGHS RANGING FROM THE MID 70S TO THE LOWER
80S.
&&

.LONG TERM /MONDAY NIGHT THROUGH FRIDAY/...
A TROUGH DIGGING INTO EASTERN CANADA WILL SET THE STAGE FOR SOME
COOLER WEATHER COMING IN DURING THE MID WEEK PERIOD. A COLD FRONT
COMING THROUGH MONDAY NIGHT WILL BRING A CHANCE FOR SHOWERS AND
SCATTERED THUNDERSTORMS. THE AIR BEHIND THIS COLD FRONT WILL ONLY
BE SLIGHTLY COOLER AND DRIER ON TUESDAY. SIGNIFICANTLY COOLER AIR
WILL THEN FILTER INTO THE AREA TUESDAY NIGHT INTO WEDNESDAY AS A
TROUGH OF LOW PRESSURE BEGINS DROPPING SOUTHEAST ACROSS QUEBEC.
SOME ISOLATED SHOWERS WILL BE POSSIBLE ACROSS THE NORTH ON
WEDNESDAY. THE TROUGH WILL BEGIN TO LIFT AWAY TO THE NORTHEAST ON
THURSDAY ALLOWING FOR A DRY DAY WITH SUNSHINE AND TEMPS A FEW
DEGREES BELOW NORMAL. DRY WEATHER MAY LAST INTO FRIDAY BEFORE A
DEEPER AND STRONGER TROUGH APPROACHES OVER THE WEEKEND BRINGING A
CHANCE FOR SHOWERS SATURDAY THEN A TREND TOWARD COOLER CONDITIONS
SUNDAY INTO MONDAY.
&&

.AVIATION /02Z SATURDAY THROUGH WEDNESDAY/...
NEAR TERM: VFR CONDITIONS ARE EXPECTED OVERNIGHT INTO EARLY
SATURDAY. HOWEVER...SHOWERS AND THUNDERSTORMS WILL DEVELOP BY
EARLY AFTERNOON ALONG A COLD FRONT AND CROSS FROM NORTHWEST TO
SOUTHEAST DURING THE AFTERNOON/EVENING. MVFR AND EVEN LOCAL IFR
CONDITIONS WILL BE POSSIBLE IN ANY CONVECTION ALONG WITH GUSTY
WINDS AND SMALL HAIL.

SHORT TERM: SCATTERED SHOWERS AND THUNDERSTORMS ARE EXPECTED
ACROSS MUCH OUR FCST AREA SUNDAY AND MONDAY. REDUCED CIGS AND
VSBYS WILL PROBABLY ACCOMPANY THE STRONGER SHOWERS AND STORMS.
ALSO...STRONG WINDS...FREQUENT LIGHTNING AND HEAVY DOWNPOURS ARE
POSSIBLE WITH THE STRONGER STORMS ON MONDAY.
&&

.MARINE...
NEAR TERM: WINDS/SEAS WILL REMAIN BELOW SMALL CRAFT ADVISORY
LEVELS OVERNIGHT THROUGH SATURDAY.

SHORT TERM: WINDS AND WAVE HEIGHTS WILL STAY BELOW SCA CRITERIA
DURING SATURDAY NIGHT THROUGH MONDAY. HOWEVER SOME THUNDERSTORM
ACTIVITY MAY AFFECT COASTAL MARINE ZONES ON MONDAY.
&&

.CAR WATCHES/WARNINGS/ADVISORIES...
ME...NONE.
MARINE...NONE.

&&

$$

NEAR TERM...NORCROSS/HASTINGS
SHORT TERM...BERDES
LONG TERM...BLOOMER
AVIATION...NORCROSS/HASTINGS/BERDES
MARINE...NORCROSS/BERDES



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