Spot Forecast
Issued by NWS Boston, MA
Issued by NWS Boston, MA
140
FNUS71 KBOX 191420
FWSBOX
Spot Forecast for Boston Mooring Saturday Sunday...US Coast Guard
National Weather Service Boston/Norton MA
1020 AM EDT Tue Aug 19 2025
Forecast is based on forecast start time of 1000 EDT on August 23.
If conditions become unrepresentative, contact the National
Weather Service.
.DISCUSSION...
Winds and seas continue to diminish Saturday into Sunday.
Expecting south winds to develop by late morning at 15-20 kt with
gusts up 25-30 kt. Gusts diminish Saturday night, then increase
once again Sunday. Mainly dry, although there is a risk for a late
day shower Sunday.
.SATURDAY...
Sky/weather.........Sunny.
Chance of thunder...3 percent.
Chance of lightning.3 percent.
Begin/end of pcpn...
Max temperature.....Around 76.
Surface winds (kts).South winds 8 to 12 knots.
Wind shift..........
Wave height.........Less than 1 foot.
Wave height.........Less than 1 foot.
Wave period.........0 SECONDS.
Freezing spray......None.
Sea surface temp....MISSING.
Pcpn amount.........0.00 inches.
CEILING (KFT).......21 decreasing to 19 early, then decreasing to
14 early in the afternoon decreasing to 12
early in the afternoon increasing to 16
increasing to 18 late in the afternoon.
Visibility..........9.
SUNSET..............
TIDES...............
Mixing height.......5000 ft AGL.
Transport winds.....Southwest 14 to 17 mph.
Smoke dispersal.....Good (32900 knot-ft) early in the morning
increasing to excellent (63800 knot-ft) in the
afternoon.
LVORI...............2.
ADI.................1 early in the morning increasing to 42 in the
afternoon.
TIME (EDT) 10A 11A 12P 1PM 2PM 3PM 4PM 5PM
Sky (%).........11 7 8 10 11 11 12 12
Weather cov.....
Weather type....
Tstm cov........
Chc of thdr (%).0 0 0 0 0 0 0 0
Chc of ltng (%).0 0 0 0 0 0 0 0
Temp............69 71 72 72 72 73 73 73
SFC wnd dir.....SW SW S S S S S S
SFC wnd spd kts.8 9 10 10 11 12 12 12
SFC wnd gst.....14 15 16 17 18 18 18 18
Mix hgt (kft)...2.8 3.5 4.2 4.7 5.0 4.9 4.5 3.8
Transp wind dir.W SW SW SW SW SW S S
Transp wind spd.14 14 14 14 14 15 16 17
LVORI...........3 3 3 1 1 3 3 3
ADI.............32 36 39 41 42 1 1 1
Vrate kt-ft/1K..33 43 50 56 60 64 64 57
Ventrate Cat....PR FR FR FR FR GD GD FR
Wave period (s).0 0 0 0 0 0 0 0
Wave height (ft)0 0 0 0 0 0 0 0
Freezing spray..
SST (F).........M M M M M M M M
Ceiling (kft)...21 19 16 14 12 13 16 18
Visibility (sm).9 9 9 9 9 9 9 9
.SATURDAY NIGHT...
Sky/weather.........Mostly clear.
Chance of thunder...4 percent.
Chance of lightning.4 percent.
Begin/end of pcpn...
Min temperature.....Around 64.
Surface winds (kts).South winds 7 to 11 knots.
Wind shift..........
Wave height.........Less than 1 foot.
Wave height.........Less than 1 foot.
Wave period.........0 SECONDS.
Freezing spray......None.
Sea surface temp....MISSING.
Pcpn amount.........0.00 inches.
CEILING (KFT).......21 increasing to 24 early, then decreasing to
21 decreasing to 18 after midnight.
Visibility..........9.
SUNRISE.............
TIDES...............
Mixing height.......400 ft AGL.
Transport winds.....South 10 to 16 mph.
Smoke dispersal.....Good (39900 knot-ft) early in the evening
decreasing to poor (3800 knot-ft) late in the
night.
LVORI...............3.
ADI.................7 to 37.
TIME (EDT) 6PM 7PM 8PM 9PM 10P 11P MID 1AM 2AM 3AM 4AM 5AM
Sky (%).........10 9 7 12 16 21 25 29 33 31 30 28
Weather cov.....
Weather type....
Tstm cov........
Chc of thdr (%).0 0 0 0 0 0 0 0 0 0 0 0
Chc of ltng (%).0 0 0 0 0 0 0 0 0 0 0 0
Temp............72 71 70 69 69 68 67 67 66 65 65 65
SFC wnd dir.....S S S S S S S S S S S S
SFC wnd spd kts.11 10 9 9 8 8 8 7 7 7 7 7
SFC wnd gst.....17 17 16 15 15 14 13 13 12 12 12 12
Mix hgt (kft)...2.8 1.7 0.8 0.5 0.4 0.5 0.4 0.5 0.5 0.4 0.4 0.5
Transp wind dir.S S S S S S S S S S S S
Transp wind spd.16 15 14 14 14 14 13 12 10 10 10 12
LVORI...........1 2 3 3 3 3 4 4 4 4 4 4
ADI.............37 26 9 9 9 9 8 8 7 7 7 8
Vrate kt-ft/1K..40 22 10 6 5 6 5 5 4 4 4 5
Ventrate Cat....PR PR PR PR PR PR PR PR PR PR PR PR
Wave period (s).0 0 0 0 0 0 0 0 0 0 0 0
Wave height (ft)0 0 0 0 0 0 0 0 0 0 0 0
Freezing spray..
SST (F).........M M M M M M M M M M M M
Ceiling (kft)...21 23 25 25 24 22 21 19 18 18 18 19
Visibility (sm).9 9 9 9 9 9 9 9 9 9 9 9
.SUNDAY...
Sky/weather.........Mostly sunny. Slight chance of showers in the
afternoon.
Chance of thunder...12 percent.
Chance of lightning.12 percent.
Begin/end of pcpn...
Max temperature.....Around 75.
Surface winds (kts).South winds 7 to 12 knots.
Wind shift..........
Wave height.........Less than 1 foot.
Wave height.........Less than 1 foot.
Wave period.........0 SECONDS through early afternoon.
Freezing spray......None.
Sea surface temp....MISSING.
Pcpn amount.........0.00 inches.
CEILING (KFT).......19 decreasing to 5.0.
Visibility..........9.
SUNSET..............
TIDES...............
Mixing height.......5200 ft AGL.
Transport winds.....South 13 to 22 mph increasing to around 23 mph
late in the afternoon.
Smoke dispersal.....Poor (6100 knot-ft) early in the morning
increasing to excellent (98400 knot-ft) in the
afternoon.
LVORI...............4 early in the morning.
ADI.................13 to 14 early in the morning.
TIME (EDT) 6AM 7AM 8AM 9AM 10A 11A 12P 1PM 2PM 3PM 4PM 5PM
Sky (%).........30 32 34 37 40 43 44 45 46 47 48 49
Weather cov..... SCH SCH SCH SCH SCH SCH
Weather type.... RW RW RW RW RW RW
Tstm cov........
Chc of thdr (%).0 0 0 0 0 0 0 0 10 10 10 10
Chc of ltng (%).0 0 0 0 0 0 0 0 10 10 10 10
Temp............65 65 66 68 70 72 72 72 71 71 72 72
SFC wnd dir.....S S S S S S S S S S S S
SFC wnd spd kts.7 7 7 8 9 10 11 12 12 12 12 12
SFC wnd gst.....12 12 13 14 16 17 18 20 20 21 21 21
Mix hgt (kft)...0.6 0.8 1.3 2.0 2.9 3.8 4.5 5.0 5.2 5.1 4.7 4.0
Transp wind dir.S S S S S S S S S S S S
Transp wind spd.13 13 14 15 16 17 18 20 21 22 23 23
LVORI...........4 4 M M M M M M M M M M
ADI.............13 14 M M M M M M M M M M
Vrate kt-ft/1K..6 9 15 26 41 56 72 85 94 98 94 80
Ventrate Cat....PR PR PR PR FR FR GD GD GD GD GD GD
Wave period (s).0 0 0 0 0 0 0 0 M M M M
Wave height (ft)0 0 0 0 0 0 0 0 0 0 0 0
Freezing spray..
SST (F).........M M M M M M M M M M M M
Ceiling (kft)...19 20 20 20 15 13 10 7.0 5.0 5.0 5.0 5.0
Visibility (sm).9 9 9 9 9 9 9 9 9 9 9 9
$$
Forecaster...Belk
Requested by...ENS Ronan Stone
Type of request...SAR
.TAG 2520222.0/BOX
.DELDT 08/19/25
.FormatterVersion 2.0.0
.EMAIL ronan.c.stone@uscg.mil