Woburn Weather Center  50.7°F

Area Forecast Discussion
National Weather Service Boston/Norton MA
726 PM EDT Mon Apr 21 2025

SYNOPSIS
A warm front will spread increased cloudiness into Southern New
England through tonight, with passing showers around and after
midnight. Rain showers then taper off early on Tuesday with
decreasing cloudiness in most areas toward mild temperatures in
the 60s to low 70s, but cloud cover may linger into the
afternoon for the southern coast with cooler temperatures. Mild
and dry weather for the rest of the workweek, before our weather
pattern turns more unsettled again around the weekend.

.NEAR TERM /UNTIL 6 AM TUESDAY MORNING/...
330 PM Update:

Key Messages:

* Turning overcast tonight, with periods of rain showers around
  and after midnight.

* Rain showers taper off overnight in western New England, but may
  linger into the pre-dawn hours in eastern New England.

* Lows mid 40s to around 50.

Details:

Although we started the day with full sunshine with coastal
seabreezes, we`re starting to see increased cloud cover in most
areas west of I-495 in MA. This is associated with increased
moisture from a warm front which trails from northern VT through
western RI; warm sector regime currently confined to much of the
eastern Gt Lakes, central/southern NY and western MA/CT precedes a
cold front now working its way through the Ohio Valley.

Cloud cover will only continue to gradually increase through tonight
and overnight, although many areas to remain dry thru midnight. Rain
showers then move into western New England around midnight, then
slowly progressing eastward into eastern MA and RI toward the pre-
dawn hours. Precipitable water values increase to around 1.2" with
the increased SW flow aloft; wouldn`t rule out some very brief
downpours in a few showers but they`re expected to pass through with
little overall fanfare. Through early Tuesday morning we should see
areal-average rain amts of up to a quarter-inch. Rain showers should
be coming to an end west of Worcester close to daybreak while
continuing into eastern MA, RI and the Cape and Islands. With the
warm advection (925 mb temps warm to around +12C) and increased
cloud cover, sided low temps toward milder side of guidance into the
mid to upper 40s.

.SHORT TERM /6 AM TUESDAY MORNING THROUGH 6 PM TUESDAY/...
330 PM Update:

Key Messages:

* Overcast to start Tue; improvement away from the coastlines by mid
  morning, but it may take until the afternoon before peeks of sun
  break out for the South Coast, Cape and Islands. Temps range from
  mid 60s to low 70s away from the southern coast, but only in the
  50s to low 60s south coast, Cape/Islands.

* Dry cold frontal passage Tue night, with modest NW breezes.
  Seasonable lows in the mid 40s.

Tuesday and Tuesday Night:

Rain showers from the overnight will be progressing off to the east
and offshore thru the early to mid morning hours. So while we start
off the day with overcast conditions, expect decreasing cloud cover
and warming temperatures away from the coasts into the 60s to low
70s. Forecast challenge for Tuesday resides along the south coast,
Cape and Islands; very limited mixing is progged given the cooler
marine boundary layer with moisture trapped beneath the warm airmass
aloft. This is visualized in forecast soundings at New Bedford,
Westerly, Falmouth/Hyannis and Nantucket. It could be quite a while,
potentially into the afternoon, before low clouds begin to erode
given those profiles. and that would cut into how warm temperatures
may get for the southern coast, with cooler SWly onshore flow for
these locations as well. Thus opted for highs only in the 50s,
perhaps near 60. If cloud cover does scatter out earlier, then temps
would be too cool and could reach up into low to mid 60s.

We then get a dry cold frontal passage for Tuesday evening, with
increased NWly breezes and falling dewpoint temps. However dry
weather is expected to accompany the front and in the intervening
hours behind its passage. Lows mainly in the 40s.

.LONG TERM /TUESDAY NIGHT THROUGH MONDAY/...
Key Messages:

* Warmer and drier Wednesday and Thursday with  mostly clear skies.

* Pattern becomes more unsettled Friday through the weekend with
  periodic chances for precipitation.

Wednesday through Weekend:

A cold front moves through Tuesday night into early Wednesday
morning, bringing a slightly cooler and drier airmass to southern
New England. Wednesday trends slightly cooler than Tuesday, although
still warmer than normal overall. Highs range in the 50s for the
Cape/Island and high 60s for the interior. Light NW winds expected
under broad high pressure with localized sea breezes in the
afternoon for the coastal areas.

A similar pattern stays in place through the end of the week with
zonal flow and 850mb temperature anomalies signaling at slightly
above normal temperatures. Ensemble guidance shows a transition to a
more unsettled pattern Friday into the weekend.

Heights fall across the region ahead of an upper level trough moving
over the Great Lakes. A weaker leading shortwave moves through
Friday evening with the main trough moving through by the end of the
weekend. This will bring a few rounds of spotty showers to the area;
however, still need to iron out the details with the timing/chances
of the first wave of showers on Friday. A more consistent round of
rain moves in overnight through Saturday. Slightly cooler for the
weekend as temperatures range around normal. Conditions gradually
drying out for Sunday.

.AVIATION /00Z TUESDAY THROUGH SATURDAY/...
Low - less than 30 percent.
Moderate - 30 to 60 percent.
High - greater than 60 percent.

00z TAF Update:

VFR. S winds around 7-12 kt and a few gusts across the interior.

Tonight: High confidence.

VFR thru at least 04z Tue. Categories then start to deteriorate
to MVFR from 04-08z from W to E, in 4-6 SM -SHRA and ceilings
010-020. Outside chance at IFR ceilings but think chances for
IFR are decreasing. -SHRA should be ongoing from ORH east by end
of this period, while trending dry for BAF/BDL. S winds around
10 kt, with areas of low level shear as SW jet of 40 kt moves
overhead.

Tuesday: High confidence in trends but moderate on timing.

Sub-VFR ceilings (mainly MVFR/IFR range) early to scatter out
to VFR 13-15z. It may take longer for south-coastal/Cape
airports to scatter out to VFR and showed MVFR-IFR ceilings thru
at least 18z before trending to VFR. SW winds around 5-10 kt
then shift to WSW/W around 10 kt, with occasional gusts to 20 kt
for the interior.

Tuesday Night: High confidence.

VFR. WNW winds around 5-10 kt.

KBOS TAF...High confidence in TAF. VFR thru 07z, then
categories trend to MVFR with light showers. Improvement to VFR
anticipated by 13z.

KBDL TAF...High confidence in TAF. VFR thru 04z, then
categories trend to MVFR with light showers. Improvement to VFR
anticipated by 11z.

Outlook /Tuesday Night through Saturday/...

Tuesday Night: VFR. Breezy.

Wednesday through Thursday Night: VFR.

Friday: VFR. Breezy.

Friday Night: Mainly VFR, with local MVFR possible. Breezy.
Chance SHRA.

Saturday: Mainly MVFR, with local VFR possible. Breezy. SHRA
likely.

.MARINE...
Forecaster Confidence Levels:

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

Tonight through Tuesday Night: High confidence.

Generally tranquil boating conditions through early tonight with
SE to S winds around 10-15 kt and seas 2-3 ft. Winds then
become S/SW around 15-20 kt tonight into Tuesday with passing
rain showers. SW gusts could reach near 25 kt over the far
southeast offshore waters, before becoming west late Tuesday
night.

Seas also begin to build to around 4 ft overnight tonight,
perhaps near 5 ft over the southern offshore waters. Seas
continue around that range through Tuesday night.

With the potential for limited mixing over the waters as a mild
airmass moves overhead, it will be close but felt conditions
were borderline for SCAs and refrained from hoisting at this
time. Later shifts could consider one to cover the Tuesday
timeframe if winds or seas increase further, but this does not
seem likely.

Outlook /Tuesday Night through Saturday/...

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

Wednesday through Friday: Winds less than 25 kt.

Friday Night: Winds less than 25 kt. Seas locally approaching
5 ft. Chance of rain showers.

Saturday: Low risk for Small Craft Advisory winds with gusts up
to 20 kt. Seas up to 5 ft. Rain showers likely.

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

SYNOPSIS...Loconto/McMinn
NEAR TERM...Loconto
SHORT TERM...Loconto
LONG TERM...McMinn
AVIATION...Loconto/McMinn
MARINE...Loconto/McMinn          

Zone Forecast Product for Southern New England
National Weather Service Boston/Norton MA
703 PM EDT Mon Apr 21 2025

Forecast Synopsis
A warm front will spread increased cloudiness into Southern New
England through tonight, with passing showers around and after
midnight. Rain showers then taper off early on Tuesday with
decreasing cloudiness in most areas toward mild temperatures in
the 60s to low 70s, but cloud cover may linger into the
afternoon for the southern coast with cooler temperatures. Mild
and dry weather for the rest of the workweek, before our weather
pattern turns more unsettled again around the weekend.

Southeast Middlesex MA-
Including the city of Cambridge
703 PM EDT Mon Apr 21 2025

.TONIGHT...Cloudy. Showers after midnight. Not as cool with lows
in the upper 40s. South winds 5 to 10 mph. Gusts up to 20 mph
this evening. Chance of rain 80 percent.
.TUESDAY...Cloudy with a chance of showers in the morning, then
mostly sunny in the afternoon. Not as cool with highs in the
lower 70s. Southwest winds around 5 mph, becoming west 10 to
15 mph in the afternoon. Chance of rain 50 percent.
.TUESDAY NIGHT...Partly cloudy in the evening, then becoming
clear. Lows in the mid 40s. West winds 10 to 15 mph.
.WEDNESDAY...Sunny. Highs around 70. Northwest winds 5 to 10 mph.
.WEDNESDAY NIGHT...Mostly clear. Lows in the mid 40s. North winds
around 5 mph.
.THURSDAY...Sunny. Highs in the upper 60s.
.THURSDAY NIGHT...Partly cloudy. Lows in the upper 40s.
.FRIDAY...Partly sunny. Highs in the lower 70s.
.FRIDAY NIGHT...Mostly cloudy with a 50 percent chance of
showers. Lows in the lower 50s.
.SATURDAY...Showers likely. Highs in the upper 60s. Chance of
rain 70 percent.
.SATURDAY NIGHT...Showers likely. Lows in the upper 40s. Chance
of rain 60 percent.
.SUNDAY AND SUNDAY NIGHT...Mostly clear. Highs in the mid 60s.
Lows in the mid 40s.
.MONDAY...Mostly sunny. Highs in the upper 60s.          

REGIONAL WEATHER ROUNDUP
NATIONAL WEATHER SERVICE BOSTON/NORTON MA
700 PM EDT MON APR 21 2025

NOTE:  "FAIR" INDICATES FEW OR NO CLOUDS BELOW 12,000 FEET WITH NO
SIGNIFICANT WEATHER AND/OR OBSTRUCTIONS TO VISIBILITY.

MAZALL-220000-
EASTERN MASSACHUSETTS

CITY           SKY/WX    TMP DP  RH WIND       PRES   REMARKS
BOSTON         CLOUDY    52  27  38 S18       30.16F
BEVERLY        CLOUDY    52  31  44 S9        30.14F
LAWRENCE       CLOUDY    54  31  41 VRB5      30.15F
BEDFORD        CLOUDY    53  27  36 S14G22    30.14F
NORWOOD        CLOUDY    51  27  39 S13       30.18F
MARSHFIELD     CLOUDY    50  28  43 S10G16    30.19S
PLYMOUTH       CLOUDY    48  28  46 SW12G17   30.19F
TAUNTON        CLOUDY    49  28  44 S8        30.20F
NEW BEDFORD    CLOUDY    48  33  56 S12       30.21F


MAZALL-220000-
CAPE COD AND THE ISLANDS

CITY           SKY/WX    TMP DP  RH WIND       PRES   REMARKS
FALMOUTH       PTCLDY    46  30  53 S14       30.22F
HYANNIS        CLOUDY    46  34  62 S13G21    30.20F
CHATHAM        CLOUDY    48  32  53 S8G18     30.23F
PROVINCETOWN   CLOUDY    46  36  68 S10       30.21F
NANTUCKET      CLOUDY    45  34  65 S13       30.24F
MARTHAS VNYRD  CLOUDY    46  35  65 S12       30.22F


MAZALL-220000-
CENTRAL AND WESTERN MASSACHUSETTS

CITY           SKY/WX    TMP DP  RH WIND       PRES   REMARKS
WORCESTER      CLOUDY    49  26  41 S10       30.13F
FITCHBURG      CLOUDY    55  26  32 S13       30.13F
ORANGE         CLOUDY    54  26  34 S10       30.12F
SPRINGFIELD    CLOUDY    49  19  30 S13       30.10F
WESTFIELD      CLOUDY    53  27  36 S8        30.13F
NORTH ADAMS    CLOUDY    56  25  30 E12G24    30.07F
PITTSFIELD     CLOUDY    52  25  35 S10G18    30.07F


RIZALL-220000-
RHODE ISLAND

CITY           SKY/WX    TMP DP  RH WIND       PRES   REMARKS
PROVIDENCE     CLOUDY    48  33  56 S10       30.21F
NEWPORT        CLOUDY    47  34  60 S12       30.21F
BLOCK ISLAND   CLOUDY    45  37  73 S10       30.21F
SMITHFIELD     CLOUDY    49  27  42 VRB6      30.18F
WESTERLY       CLOUDY    46  36  68 SE7       30.20F


CTZALL-220000-
CONNECTICUT

CITY           SKY/WX    TMP DP  RH WIND       PRES   REMARKS
BRADLEY INTL   CLOUDY    52  26  36 S13G21    30.15F
HARTFORD       CLOUDY    52  29  41 S10       30.15F
PLAINVILLE     CLOUDY    52  26  37 S8        30.15F
BRIDGEPORT     CLOUDY    51  39  63 SE9       30.17F
DANBURY        CLOUDY    53  32  44 SE8       30.15F
GROTON         CLOUDY    47  38  71 SE8         N/A
NEW HAVEN      CLOUDY    52  40  63 SE15      30.17F
CHESTER        CLOUDY    50  30  46 SE10      30.17F
MERIDEN        CLOUDY    52  30  43 S8        30.16F
WILLIMANTIC    CLOUDY    49  27  42 S8        30.19F
OXFORD         CLOUDY    49  32  52 SE10      30.15F


MEZ002-015-021-024-NHZ003-005-008-011-012-014-VTZ005-008-220000-
NORTHERN NEW ENGLAND

CITY           SKY/WX    TMP DP  RH WIND       PRES   REMARKS
PORTLAND ME    CLOUDY    44  33  65 S13G24    30.17F
BANGOR ME      CLOUDY    49  29  46 S12G23    30.13S
CONCORD NH     MOCLDY    53  29  39 SE8       30.10F
MANCHESTER NH  CLOUDY    57  29  34 SE10      30.10F
NASHUA NH      CLOUDY    57  25  29 S6G17     30.13F
PORTSMOUTH NH  CLOUDY    46  34  64 SE10      30.14F
JAFFREY NH     CLOUDY    52  25  35 VRB7      30.10F
KEENE NH       CLOUDY    54  26  34 S13G18    30.10F
BURLINGTON VT  CLOUDY    56  30  37 S12G22    29.98F
MT. WASHINGTON NOT AVBL


NYZ052-076-220000-
EASTERN NEW YORK

CITY           SKY/WX    TMP DP  RH WIND       PRES   REMARKS
ALBANY         CLOUDY    58  27  30 SE16G33   30.02F
NEW YORK CITY  CLOUDY    53  36  52 SE14      30.13F


ANZALL-220000-
MARINE OBSERVATIONS

STATION/POSITION TIME  TEMP    WIND        PRES    VSBY  WAVE
                       AIR SEA DIR/SP/G                  HT/PER
                 (UTC) (F)     (DEG/KT/KT) (MB)    (MI)  (FT/S)
BOSTON BUOY      2250   48 44  170/ 10/ 14 1021.9F         2/ 4
BUZZARDS BAY     2200          170/ 14/ 16 1024.3F
NANTUCKET SOUND  2250   47 48  190/ 16/ 17 1022.9F         2/ 3
MASS BAY-STELLWA 2104   45     140/ 17/ 19 1021.3F  1 7/8  2/ 4
ISLE OF SHOALS   2200   43     140/ 18/ 20 1021.2F
S OF BLOCK IS    2256      46                N/A           2/ 3


......................KEY.........................
  SKY/WX - SKY CONDITION/PRESENT WEATHER
  TMP    - TEMPERATURE IN FAHRENHEIT
  DWPT   - DEWPOINT IN FAHRENHEIT
  RH     - RELATIVE HUMIDITY IN PERCENT
  WIND   - DIRECTION AND SPEED IN MPH
  PRES   - MEAN SEA LEVEL PRESSURE IN INCHES OF HG
  WCI    - WIND CHILL INDEX
  VSB    - VISIBILITY IN MILES
  HX     - HEAT INDEX
  TC     - TEMPERATURE IN CELSIUS
  VRB    - VARIABLE WIND DIRECTION
  N/A    - NOT AVAILABLE          

Max/Min Temperature and Precipitation Table for
Most of Southern New England
National Weather Service Boston/Norton MA
820 AM EDT Mon Apr 21 2025

This is an automated product. These data are preliminary and have
not undergone final quality control by the National Centers for
Environmental Information (NCEI). Therefore, these data are subject
to revision. Final and certified climate data can be accessed at
www.ncei.noaa.gov.

Values represent highs yesterday, lows over the last 12 hours and
precipitation over the last 24 hours.

.BR BOX  0421 ES DH00/TAIRZX/DH07/TAIRZP/PPDRZZ

                           Max        Min         24-Hour
ID         Location        Temp       Temp     Precipitation

Eastern Massachusetts...
 BED        Bedford        68    /    30    /    0.00
 BVY        Beverly        69    /    32    /    0.00
 BOS        Boston         70    /    43    /    0.00
 LWM       Lawrence        69    /    35    /    0.00
 EWB      New Bedford      67    /    31    /    0.00
 OWD        Norwood        73    /    32    /    0.00
 PYM       Plymouth        69    /    32    /    0.00
 GHG      Marshfield       70    /    36    /

Cape Cod and the Islands...
 CQX        Chatham        64    /    39    /    0.00
 HYA        Hyannis        62    /    34    /    0.00
 MVY   Marthas Vineyard    67    /    26    /    0.00
 ACK       Nantucket       62    /    37    /      T
 FMH       Falmouth        63    /    34    /
 PVC     Provincetown      56    /    41    /

Central and Western Massachusetts...
 FIT       Fitchburg       68    /    31    /    0.00
 ORE        Orange         66    /    27    /    0.00
 CEF      Springfield      69    /    31    /    0.00
 BAF       Westfield       67    /    31    /    0.00
 ORH       Worcester       64    /    38    /    0.00

Rhode Island...
 BID     Block Island      63    /    40    /
 SFZ      Smithfield       71    /    34    /
 UUU        Newport        66    /    40    /    0.00
 PVD      Providence       71    /    39    /    0.00
 WST       Westerly        66    /    36    /    0.00

Northern Connecticut...
 BDL   Hartford-Bradley    70    /    35    /    0.00
 HFD       Hartford        73    /    38    /    0.00
 IJD      Willimantic      71    /    32    /    0.00