FXUS61 KGYX 182158

Area Forecast Discussion
National Weather Service Gray ME
558 PM EDT Sat Aug 18 2018

High pressure will build in from the northeast tonight through
Sunday night and will hold over the region through Tuesday. Low
pressure will track east through southern Quebec Tuesday night
and Wednesday and will drive a trailing cold front through the
region Wednesday evening. High pressure will build in from the
west Thursday and Friday.


555 pm Update: The last of the showers currently drying up and
moving southeast off the coast as per radar and expect trend to
continue. Starting at 00z lowered POPs over southern areas to
reflect drying conditions and no further chance of any showers.
Also, although low level drying causes dewpoints to fall
tonight, with clearing skies and also cooler temps will expect
fog to form in many of the valleys later tonight so introduced
more fog into the forecast. Tweaked near term temps for next few
hours based on latest obs data.

Previous Discussion:
Cold front is slowly pushing offshore early this afternoon
leaving a fair amount of low level moisture and a few showers
in its wake. Expect shower widely scattered showers to gradually
fade out during the remainder of the afternoon with partial
clearing this evening. Clouds will gradually clear from north to
south overnight with valley fog developing after midnight. Lows
will range through the 50s to near 60.


High pressure will build in from the northeast on Sunday
producing mostly sunny skies aside from a little cirrus over
southern zones. Highs will range from the mid 70s to near 80.

High pressure will continue to build in from the northeast
Sunday night. Looking for variable high clouds with lows in the
upper 40s to upper 50s.


At 500 MB across NOAM, there are no significant changes to the
large-scale flow pattern although sore subtle changes will allow
for some changes in our sensible wx over the next week or so.
All in all the strong ridging over the wrn Atlantic and over the
wrn CONUS will hold with weak troughing continuing across the
ern half of the US. While the ridges remain strong, the
troughing does make some inroads into the region, allowing for
some relatively drier and cooler air to bring conditions back
closer to normal levels for August. Also, only one threat for
showers and thunderstorms will centered around Wednesday.

Sfc ridging will extend from nrn New England ewd into the
Canadian Maritimes, which should keep a light gradient NE flow
in the area, which will likely switch more SE along the coast in
the afternoon. Skies will be partly to mostly sunny with highs
in the mid to upper 70s in most spots, but probably closer to 70
along the coast. Monday should be clear and cool with some rad
cooling, and lows will generally rang from the low 50s in the N
to the upper 50s in srn NH and the coast, although some of the
sheltered inland locations could dip into the upper 40s.

Tuesday should be a decent day with partly sunny skies and
temps not much different than Monday, but humidity should creep
up a bit. Clouds will move in Tuesday night, as low pressure
tracks out of the GReat Lakes and NE thru the St. Lawrence Vly
Wed into Wed night. Tue night should be on the muggier side,
with Tds and lows in the low to mid 60s. Wednesday looks to be
the focus for any SHRA/TSRA moving thru ahead of a cold front
that will pulled across the CWA by that low to our N.

By Thursday, should see fair and less humid conditions, which
should continue into Friday Saturday, as the ridge over the
atlantic builds to our east and forces troughing back to the
west. Temps should be near to slightly above normal, with slowly
increasing humidity.


Short Term...VFR tonight with areas of IFR/LIFR ceilings/vsby in
valley fog. VFR Sunday and Sunday night.

Long Term...Mainly VFR Monday through Tue night. Could see
a period of flight restrictions in SHRA/TSRA on Wed.


Short Term...No flags.

Long Term...May need an SCA on Wed, otherwise quiet.





Near Term...Marine

NWS GYX Office Area Forecast Discussion

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