Lexington Weather

Lexington, Massachusetts, USA

50°F

10/6/2024 3:42am

Lexington Conditions: Clear
Temperature: 49.6°F / 9.8°C
Dew Point: 44.1°F
Relative Humidity: 81%
Wind: Calm, 10-min avg: Calm, gust: None
Barometer: 30.10 in Steady
Visibility: 10 miles
Rain Today: 0.00 in

Area Forecast Discussion
for Boston / Norton, MA

        
000
FXUS61 KBOX 300147
AFDBOX

Area Forecast Discussion
National Weather Service Boston/Norton MA
947 PM EDT Sun Sep 29 2024

.SYNOPSIS...
High pressure continues to provide dry conditions to the region 
into early next week. Low chance for a shower mid-week, followed
by continued dry conditions as high pressure will bring a 
return to dry and seasonable weather later in the week.

&&

.NEAR TERM /UNTIL 6 AM MONDAY MORNING/...
No major changes to the forecast at this hour as things remain 
on track.

Previous Discussion...

Slightly slowed the return of marine stratus this evening. East
winds are not quite as strong as last evening to advect these 
clouds onshore. Not looking there will be much fog with very low
visibility. The greatest risk for that should be in the CT River
Valley. Minor tweaks to sky cover and temperatures to reflect
observed trends. 

Overnight into early tomorrow morning clouds filter back in to 
areas that were able to break into partial sunshine. Think there
will still be partially clear skies for northern areas that 
border southern New Hampshire and Vermont, leading to cooler 
temperatures in the upper 40s and 50F. Elsewhere more in the way
of clouds and temperatures in the lower and middle 50s. 
Dewpoints fall overnight to the low 50s, could see areas of 
ground fog develop across the interior late tonight/predawn 
Monday.

&&

.SHORT TERM /6 AM MONDAY MORNING THROUGH MONDAY NIGHT/...
Updated: 2:20 PM

Any morning fog and/or stratus will take some time to disperse
given the low sun angle in late September. Still, plenty of 
mid and high clouds remain well into the afternoon. With high 
pressure to our north the region remains under east to northeast
flow, albeit light winds less than 10 MPH, this will keep 
afternoon temperatures seasonably cool and trended the 
temperatures lower than the NBM guidance given the outcome of 
Sunday's afternoon high temperatures. Expect high temperatures 
between 67F and 73F. 

Similar conditions Monday night into Tuesday with the return of
low stratus and patchy fog, temperatures are once again in the
low and middle 50s.

&&

.LONG TERM /TUESDAY THROUGH SUNDAY/...
Highlights...

* Mostly dry and pleasant weather continues through next week.

* First chance of rain showers comes Wed into Wed night, but 
  coverage is sporadic and a washout isn't expected. 

* Slight chance of rain returns around next weekend, but 
  confidence is low. 

Latest guidance suite has trended slower with moving a high
pressure ridge out of southern New England during the mid week
period. It is now looking like dry weather prevails into
Wednesday morning across our region. The guidance has come into
better agreement on the idea of a cold front arriving late
Wednesday into Wednesday night. Limited moisture expected with 
this front, so even then the overall risk for showers is low. 

Them our region gets stuck in between a few weaker features,
namely a second cold front and a high pressure ridge along the
Appalachians. At this time, thinking the ridge dominates and 
maintains dry weather late this week. The increased sunshine
should boost temperatures above normal for early October.

Not much confidence in the details heading into next weekend.
Nearly zonal flow aloft leading to various timing issues amongst
the guidance suite. This would be mainly for the timing of a
cold front heading into next weekend. Latest NationalBlend only
had a 30-40% chance of more than a tenth inch of rainfall within
48 hours ending 8 AM Sunday. Not looking like a washout at this
moment, but there is still a lot of time for these details to
come into better focus.

&&

.AVIATION /02Z MONDAY THROUGH FRIDAY/...
Forecast Confidence Levels:

Low - less than 30 percent.
Moderate - 30 to 60 percent.
High - greater than 60 percent. 

Tonight...Moderate confidence.

VFR trending MVFR after 06-08z, have held off on lower CIGs at 
this time, but low chance of this occurring mainly at elevated 
terminals like KORH. Ground fog possible across the interior. 
Winds are light and variable to calm.

Tomorrow...Moderate confidence. 

MVFR to start, trending VFR after 15z. East to northeast winds 
5 to 10 knots. 

Tomorrow Night...Moderate confidence. 

MVFR. Winds northeast less than 5 knots. 

BOS TAF...Moderate Confidence in TAF.

Lower ceilings return overnight, trending MVFR around 08z
through 15z Monday. VFR CIGs after 15z through Monday afternoon. 
East to northeast winds less than 10 knots rest of today and 
tomorrow, will have near calm winds overnight.

BDL TAF...Moderate Confidence in TAF.

Lower ceilings return overnight, trending MVFR around 08z through
12z Monday. May have patchy ground fog predawn. VFR CIGs after 
12z through Monday afternoon. East to northeast winds less than 
10 knots rest of today and tomorrow, will have near calm winds 
overnight.

Outlook /Tuesday through Friday/...

Tuesday: Mainly VFR, with local MVFR possible. 

Tuesday Night: Mainly VFR, with local IFR possible. 

Wednesday: Mainly VFR, with local MVFR possible. 

Wednesday Night through Friday: VFR.

&&

.MARINE...
Forecaster Confidence Levels:

Low - less than 30 percent.
Medium - 30 to 60 percent.
High - greater than 60 percent. 

Through Monday Night...High confidence. 

Low chance of an isolated shower for the southern outer waters 
rest of today and tonight. Otherwise, dry conditions prevail 
through Monday night. Seas and winds remain below S.C.A. 
criteria, seas are 2 to 3 foot and winds are east Sunday 
afternoon around 10 knots, then becoming light and variable 
overnight. Monday winds area northeast 8 to 12 knots. 

Outlook /Tuesday through Friday/... 

Tuesday: Winds less than 25 kt. Areas of seas approaching 5 ft.

Tuesday Night through Wednesday: Winds less than 25 kt. Seas up
to 5 ft. 

Wednesday Night through Thursday Night: Winds less than 25 kt.
Areas of seas approaching 5 ft. 

Friday: Winds less than 25 kt. Seas locally approaching 5 ft.

&&

.BOX WATCHES/WARNINGS/ADVISORIES...
CT...None.
MA...None.
RI...None.
MARINE...None.

&&

$$

SYNOPSIS...Belk/Dooley
NEAR TERM...Belk/Dooley/KP
SHORT TERM...Dooley
LONG TERM...Belk
AVIATION...Belk/Dooley
MARINE...Belk/Dooley