Orono, Maine 7 Day Weather Forecast

Wx Forecast - Wx Discussion - Wx Aviation

535
FXUS61 KCAR 151857
AFDCAR

Area Forecast Discussion
National Weather Service Caribou ME
257 PM EDT Sun Jun 15 2025

.SYNOPSIS...
High pressure will slide east of the area Monday into Tuesday.
Low pressure will then pass northwest of the area Wednesday
dragging a warm front northward by Thursday morning. A cold
front will cross the area Thursday night. A large area of high
pressure will set up across the Eastern Seaboard on Friday.

&&

.NEAR TERM /THROUGH MONDAY/...
A weak disturbance could touch off some isolated
showers this afternoon from the Central Highlands into eastern
Aroostook and northern Washington counties. Otherwise, high
pressure will dominate the weather through tonight. Any
convective cumulus clouds will dissipate this evening with the
loss of daytime heating. Mostly clear skies and nearly calm
winds will provide favorable conditions for radiational cooling
from the Central Highlands northward. Thus, went below NBM
guidance for low temperatures tonight in these areas,
particularly in colder valleys. This will result mostly in lows
in the lower to mid 40s, but some 30s will be possible in the
coldest spots. Not expecting frost development, but could see
some patchy river valley fog towards daybreak. Weak onshore flow
tonight will provide some more clouds and patchy fog for the
Bangor region and Downeast. Lows there tonight will be in the
mid to upper 40s.

Surface high begins to slide east on Monday, setting up return flow
from the south and southwest. Ample sunshine in the morning will
give way to some clouds in the afternoon. Winds will be more
southwesterly from the Central Highlands northward Monday. This is
downslope direction there, so went a bit above NBM guidance there.
Expect highs in the mid to upper 70s in these areas. The wind
direction near Bangor and Downeast will be more southerly. This will
bring in some cooler air from the Gulf of Maine. Highs will be in
the lower 70s for Bangor and Interior Downeast, with 60s for Coastal
Downeast.

&&

.SHORT TERM /MONDAY NIGHT THROUGH WEDNESDAY/...
Mon night expect the high to continue to drift S of Nova Scotia
with return flow over Maine and increasing boundary layer
moisture. Expecting areas of fog to push in from the Gulf of
Maine waters into the Downeast coast up to Bangor. Otherwise
valley fog is possible from much of the rest of the area.
Generally less than 5mph S winds. Expecting lows to fall back
into the low 50s for most locations by Tue AM. Tue features
increasing S flow over the area which will make for a strong
seabreeze Downeast pushing N of the Route 9 corridor. Expect
highs to top out there in the 50s and 60s with around 70F along
Route 9. Warmest temperatures will be from the Central
Highlands, Upper Penobscot Valley northward to the St. John
Valley with upper 70s to near 80F. Breezy S winds 10-20mph. A
weak open shortwave at 500mb may kick off a few afternoon
showers mainly in western zones from Moosehead northward and
cannot rule out a few lightning strikes along the Quebec border.

Tue night as the shortwave pivots northward over Maine expecting
a chance of showers going all night. Moist boundary layer means
fog will be possible as well especially Downeast where it could
be dense again. Temperatures remain mild in the upper 50s except
low 50s near the Washington County coast where the wind is off
the colder near Bay of Fundy waters. A weak surface trof will
shift winds more SSW-SW by daybreak Wed.

Wed looking slightly warmer under partly sunny skies and warmer
925mb temps working in. Solid agreement in the latest suite of
global models showing +17C to +19C over the area. Highs 1-3
degrees warmer than Tue with widespread upper 70s to low 80s.
Coolest spots will be from Ellsworth eastward thanks to the
seabreeze. A weak shortwave will provide a kick for afternoon
showers and potentially a few thunderstorms. Latest GFS, ECMWF,
and Canadian keep the MUCAPE 500-1000j/kg in the Central
Highlands to S. Aroostook northward. Will continue the mention
of a slight chance of thunder with these showers and just a few
showers south of these locations. Potential exists for some
heavy rain in any showers and storms that develop with PWATs
approaching 1.5 inch which is 1.5-2 sigma. Will need to continue
to monitor trends in operational runs and ensembles as sometimes
these global models struggle with producing more robust CAPE
values in New England.

&&

.LONG TERM /WEDNESDAY NIGHT THROUGH SUNDAY/...
Wed night into Thu AM a warm front will lift north through Maine
with a surface low tracking from NY state into Quebec. A lot of
clouds and fog with a nearly saturated boundary layer expected
and light and variable winds. Warm night with lows in the 58-62F
range by Thu AM.

Thurs fog will mix out in the morning as S winds increase with
winds slowly shifting SSW to SW in the afternoon as a cold front
approaches from the NW. The GFS and GEM are generally producing
500-1200j/kg of CAPE with ECMWF up 1000-2000j/kg of CAPE. PArtly
sunny skies will quickly allow heating to reach convective
temperatures by late morning to midday ahead of the cold front.
Several ensemble members suggesting a prefrontal trof will be
the kicker to develop storms but timing vary on this which means
instability is in question. Confidence is high enough to go
likely POPs for northern 1/2-2/3 of the CWA with chance thunder
at this point. Shearing looks decent at 30-40kt, if instability
builds to ECMWF levels we may be looking at a severe weather day
since the ingredient will be there. Need to monitor the trends.

Cold front pushes through Thu night but upper level energy
remains overhead to keep shower chances going. A ton of
uncertainty in the long term from Fri onward with numerous
solutions keeping the pattern progressive while the GFS
operational cuts off a low overhead and keep high probability of
showers going into next weekend. The latest NBM is closer in
line with the ECMWF and keep chance of showers with a more
progressive pattern and not a total washout from Fri into next
weekend. Temperatures generally remain seasonable to slightly
above normal but no widespread heat and humidity expected at
this point.

&&

.AVIATION /18Z SUNDAY THROUGH FRIDAY/...
NEAR TERM: Mainly VFR through tonight and
Monday. BCFG possible late tonight into early Monday AM at HUL and
PQI. Winds light and variable tonight and Monday AM. S winds 5-15
kts Monday PM.

SHORT TERM: Tue...AM IFR/LIFR possible due to BR/FG at southern
terms. BCFG/BR may reduce vsby at northern terms. VFR for the
day. S-SSW winds 5-15kt with gusts up to 20kt. PM VCSH at FVE,
CAR and PQI possible.

Wed...AM IFR/LIFR possible due to BR/FG at southern terms.
BCFG/BR may reduce vsby at northern terms. VFR with building
cigs midday. CB likely afternoon. Afternoon VCSH/VCTS at BGR
and all northern terms. VCSH at BHB. S-SW winds 5-15kt.

Thu...AM IFR/LIFR possible due to BR/FG at southern terms.
BCFG/BR may reduce vsby at northern terms. CB likely afternoon.
Afternoon -SHRA/TS likely at BGR and all northern terms.
VCSH/-SHRA possible at BHB. S winds 5-15kt. LLWS possible.

Fri...VFR. Brief vsby/cig reduced with VCSH/VCTS in the
afternoon all terms. NW winds 5-15kt.

&&

.MARINE...
NEAR TERM: Winds and seas will remain well below Small Craft
Advisory criteria through tonight and through Monday. Fog will
reduce visibility on the waters at times late tonight into Monday.

SHORT TERM: Winds/seas expected to remain below SCA conditions
throughout this week. Seas 1-3ft Tue-Thu then 2-5ft on Fri.
Winds generally less than 22kt this week. S winds Tue, SW on
Wed, S on Thu and W-NW on Fri. Fog will reduce vsby less than
1NM at times from Tue-Thu and potentially again Fri. Showers
possible Wed-Fri. Sea surface water temperatures from the
Hancock County coast out 25nm including Penobscot Bay ranges
from 48-51F this week. Water temperatures from the Washington
County coast out 25nm and east to the Hague Line including
Passamaquoddy Bay range from 45-49F this week.

&&

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

&&

$$


Near Term...Clark
Short Term...Sinko
Long Term...Sinko
Aviation...Clark/Sinko
Marine...Clark/Sinko