933
FXUS61 KCAR 210929
AFDCAR
AREA FORECAST DISCUSSION
NATIONAL WEATHER SERVICE CARIBOU ME
529 AM EDT MON SEP 21 2026
WHAT HAS CHANGED
530 AM UPDATE...UPDATE FOR 12Z AVIATION DISCUSSION.
KEY MESSAGES
1) POTENTIAL FOR PATCHY FROST MONDAY, TUESDAY, AND WEDNESDAY NIGHTS ACROSS
THE NORTH.
2) A COASTAL LOW COULD IMPACT AT LEAST DOWNEAST MAINE LATE THIS
WEEK.
DISCUSSION
KEY MESSAGE 1...POTENTIAL FOR PATCHY FROST MONDAY, TUESDAY, AND
WEDNESDAY NIGHTS ACROSS THE NORTH.
KEY MESSAGE 1 DESCRIPTION...
A COLD FRONT CURRENTLY DRAPED ALONG THE ST. LAWRENCE WILL
CONTINUE TO DROP SOUTH TODAY. 1029MB SFC HIGH LOCATED OVER
ONTARIO WILL BUILD SOUTH INTO THE AREA TONIGHT WITH SKIES
CLEARING OVER THE NORTH. AS HIGH BUILDS IN MAY SEE DEEPER
VALLEYS DECOUPLE ACRS THE NORTHWEST RESULTING ALMOST IDEAL
RADN/L COOLING CONDITIONS. ONLY CAVEAT WILL BE SOME SEMBLANCE OF
A PRESSURE GRADIENT MAY STILL EXIST LEADING TO OCNL SPURTS OF
WIND. THE GROWING SEASON HAS CLIMATOLOGICALLY ENDED FOR AREAS
NORTH OF BANGOR AS OF THIS MORNING (MONDAY MORNING), THOUGH
THOSE WHO STILL HAVE TENDER VEGETATION SHOULD TAKE STEPS TO
PROTECT THEM TONIGHT.
HIGH PRESSURE WILL BE RIDGED ACROSS THE REGION TUESDAY AND
WEDNESDAY NIGHTS WITH CLEAR SKIES AND LIGHT WINDS. THIS WILL
PROVIDE FAVORABLE CONDITIONS FOR RADIATIONAL COOLING. PATCHY/AREAS
OF FROST ARE EXPECTED TUESDAY AND WEDNESDAY NIGHTS ACROSS NORTHERN
AND CENTRAL PORTIONS OF THE REGION. TEMPERATURES COULD FALL BELOW
FREEZING ACROSS THE NORMALLY COLDER NORTHERN LOW LYING AND VALLEY
LOCATIONS.
KEY MESSAGE 2...A COASTAL LOW COULD IMPACT AT LEAST DOWNEAST
MAINE LATE THIS WEEK.
KEY MESSAGE 2 DESCRIPTION...
A COASTAL LOW WILL DEVELOP OFFSHORE FROM THE MID-ATLANTIC REGION
MID WEEK. AT THE SAME TIME, HIGH PRESSURE WILL REMAIN CENTERED
NORTHWEST OF THE REGION. THE TRACK OF THE OCEAN LOW THROUGH LATE
WEEK IS STILL UNCERTAIN. WITH BLOCKING HIGH PRESSURE TO THE
NORTHWEST, UNCERTAINTY STILL EXISTS REGARDING THE NORTHERN EDGE
OF THE PRECIPITATION SHIELD AND WHETHER RAIN WILL REACH THE
FORECAST AREA.
AVIATION /09Z MONDAY THROUGH FRIDAY/
TODAY...VFR AT DOWNEAST TERMINALS, THOUGH MAY SEE BRIEF MVFR
CIGS AT BHB THE FIRST HOUR OR TWO. MVFR WITH IMPROVEMENT TO VFR
NORTHERN AROOSTOOK TERMINALS BY 18Z THIS AFTERNOON. NW WINDS
5-10KTS, WITH GUSTS TO 20KTS.
TONIGHT-TUESDAY NIGHT...MAINLY VFR, THOUGH MAY SEE VARIABLE
CONDITIONS IN PATCHY FOG EACH MORNING. NNW AROUND 5KTS.
WEDNESDAY-THURSDAY NIGHT...VARIABLE CONDITIONS IN ANY PATCHY LATE
NIGHT FOG. OTHERWISE, VFR. NORTH/NORTHEAST WINDS 5 TO 10 KNOTS.
FRIDAY...VFR NORTH. VFR/MVFR DOWNEAST WITH A CHANCE OF RAIN.
ACROSS NORTHERN AREAS, NORTHEAST/NORTH WINDS 5 TO 10 KNOTS.
ACROSS DOWNEAST AREAS, NORTHEAST/NORTH WINDS 10 TO 15 KNOTS
WITH GUSTS UP TO AROUND 20 KNOTS.
MARINE
NNE WINDS TODAY WILL REMAIN UNDER 25KTS ALL WATERS, INCREASING
ABOVE 25KTS OVER WATERS 25-60NM TONIGHT BEFORE DIMINISHING TUE
MORNING. SEAS REMAIN BELOW SMALL CRAFT ADVISORY LEVELS OVER ALL
WATERS THROUGH TUESDAY.
SMALL CRAFT ADVISORY LEVEL WIND GUSTS POSSIBLE WEDNESDAY.
BUILDING SEAS LATE WEEK.
CAR WATCHES/WARNINGS/ADVISORIES
ME...NONE.
MARINE...NONE.
DISCUSSION...21/JMM
AVIATION...21/JMM
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