Spot Forecast
Issued by NWS Boston, MA
Issued by NWS Boston, MA
Versions:
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FNUS71 KBOX 211207
FWSBOX
Spot Forecast for Oak Bluffs Fireworks...MA DCR Forest Fire Control
National Weather Service Boston/Norton MA
807 AM EDT Fri Aug 21 2026
Forecast is based on forecast start time of 0800 EDT on August 21.
If conditions become unrepresentative, contact the National
Weather Service.
.DISCUSSION...
Steady rainfall this morning decreases to more showery/drizzle
later this afternoon into this evening. Slight risk for showers
during the day Saturday, with more widespread and steadier
rainfall expected to arrive Saturday evening into Saturday night.
.REST OF TODAY...
Sky/weather.........Mostly cloudy. Patchy fog early. Patchy fog
late in the afternoon. Showers and isolated
thunderstorms early. Showers likely early, then
chance of showers late in the afternoon.
Chance of pcpn......80 percent.
Chance of pcpn......80 percent.
Chance of pcpn......80 percent.
Chance of rain......79 percent.
Chance of thunder...15 percent.
Begin/end of pcpn...
Max temperature.....Around 72.
Min humidity........87 percent.
Max apparent temp...71.
Max apparent temp...71.
Max apparent temp...71.
Eye level winds.....Northeast winds 10 to 13 mph.
Surface winds (mph).Northeast winds 16 to 21 mph.
Wind (20 ft)........Northeast winds 16 to 21 mph. Gusty and erratic
winds expected near thunderstorms early.
100 FT WIND.........
Wave height.........2 feet building to 3 feet, then subsiding to 2
feet in the afternoon.
Rainfall amount.....0.25 inches.
Pcpn amount.........0.25 inches.
Snowfall amount.....0.0 inches.
CEILING (KFT).......0.8 increasing to 1.0 early, then increasing to
1.5 early in the afternoon decreasing to 1.0
late in the afternoon decreasing to 0.8.
Visibility..........3 increasing to 5, then increasing to 7 in the
afternoon decreasing to 4 late in the
afternoon.
Water temperature...
Mixing height.......1900 ft AGL.
Transport winds.....Northeast 20 to 23 mph.
Smoke dispersal.....Fair (22300 knot-ft) early in the morning
increasing to good (36700 knot-ft) in the
afternoon.
LVORI...............9.
ADI.................1.
TIME (EDT) 8AM 9AM 10A 11A 12P 1PM 2PM 3PM 4PM 5PM
Sky (%).........91 88 85 82 80 82 86 86 91 93
Weather cov.....DEF DEF DEF LKY LKY LKY LKY LKY CHC CHC
Weather type....RW RW RW RW RW RW RW RW RW RW
Tstm cov........ISO ISO ISO
Chc of pcpn (%).80 80 80 70 70 70 60 60 50 50
Chc of rain (%).80 70 70 60 60 60 70 60 60 50
Chc of thdr (%).20 20 20 10 10 10 10 10 10 10
Temp............71 71 71 71 71 71 71 71 70 70
RH..............93 97 97 97 97 97 97 97 97 97
Heat index (F)..71 71 71 71 71 71 71 71 70 70
Wind chill (F)..71 71 71 71 71 71 71 71 70 70
Aparnt tmp (F)..71 71 71 71 71 71 71 71 70 70
20 FT wind dir..NE NE NE NE NE NE NE NE NE NE
20 FT wind spd..20 21 21 20 18 18 17 17 17 16
20 FT wind gust.24 25 25 25 24 23 22 23 23 22
Eye lvl wnd dir.NE NE NE NE NE NE NE NE NE NE
Eye lvl wnd spd.12 13 13 12 11 11 10 10 10 10
Eye lvl wnd gst.14 15 15 15 14 14 13 14 14 13
Surface wnd dir.NE NE NE NE NE NE NE NE NE NE
Surface wnd spd.20 21 21 20 18 18 17 17 17 16
Surface wnd gst.24 25 25 25 24 23 22 23 23 22
Mix hgt (kft)...1.3 1.4 1.5 1.7 1.7 1.7 1.6 1.6 1.7 1.9
Transp wind dir.NE NE NE NE NE NE NE NE NE NE
Transp wind spd.20 21 22 23 23 23 22 22 22 22
100 ft wind.....
LVORI...........8 10 8 8 9 8 9 8 7 8
ADI.............1 1 1 1 1 1 1 1 1 1
Vrate kt-ft/1K..22 25 29 33 34 35 31 31 32 37
Ventrate Cat....PR PR PR PR PR PR PR PR PR PR
Wave height (ft)2 2 3 3 3 2 2 2 2 2
Ceiling (kft)...0.8 0.8 0.8 1.0 1.0 1.5 1.5 1.0 1.0 0.8
Visibility (sm).3 4 5 6 7 7 7 7 7 4
Water temp......
.TONIGHT...
Sky/weather.........Mostly cloudy. Patchy fog through the night.
Chance of showers through the night.
Chance of pcpn......40 percent.
Chance of pcpn......40 percent.
Chance of pcpn......40 percent.
Chance of rain......53 percent.
Chance of thunder...9 percent.
Begin/end of pcpn...
Min temperature.....Around 65.
Max humidity........100 percent.
Max apparent temp...70.
Max apparent temp...70.
Max apparent temp...70.
Eye level winds.....Northeast winds 8 to 10 mph.
Surface winds (mph).Northeast winds 14 to 16 mph.
Wind (20 ft)........Northeast winds 14 to 16 mph.
100 FT WIND.........
Wave height.........2 feet.
Rainfall amount.....0.16 inches.
Pcpn amount.........0.16 inches.
Snowfall amount.....0.0 inches.
CEILING (KFT).......0.8 decreasing to 0.3, then increasing to 0.8
around midnight.
Visibility..........4 decreasing to 3 in the evening, then
decreasing to 2.59 increasing to 4 around
midnight increasing to 5.
Water temperature...
Mixing height.......1300 ft AGL.
Transport winds.....Northeast 17 to 23 mph.
Smoke dispersal.....Good (35200 knot-ft) early in the evening
decreasing to fair (19700 knot-ft) late in the
night.
LVORI...............7.
ADI.................1 to 26.
TIME (EDT) 6PM 7PM 8PM 9PM 10P 11P MID 1AM 2AM 3AM 4AM 5AM
Sky (%).........88 82 88 80 88 91 92 93 91 90 90 90
Weather cov.....CHC CHC CHC CHC CHC CHC CHC CHC CHC CHC CHC CHC
Weather type....RW RW RW RW RW RW RW RW RW RW RW RW
Tstm cov........
Chc of pcpn (%).40 30 40 40 30 30 30 40 40 40 30 30
Chc of rain (%).50 50 40 40 40 50 50 50 40 40 40 40
Chc of thdr (%).10 10 0 0 0 10 10 10 0 0 0 0
Temp............70 70 68 68 68 68 68 68 68 68 68 68
RH..............97 93 100 100 100 100 100 100 100 100 100 100
Heat index (F)..70 70 68 68 68 68 68 68 68 68 68 68
Wind chill (F)..70 70 68 68 68 68 68 68 68 68 68 68
Aparnt tmp (F)..70 70 68 68 68 68 68 68 68 68 68 68
20 FT wind dir..NE NE NE NE NE NE NE NE NE N N N
20 FT wind spd..16 16 15 15 15 14 15 14 14 14 14 14
20 FT wind gust.22 22 22 21 21 21 20 20 20 18 20 20
Eye lvl wnd dir.NE NE NE NE NE NE NE NE NE N N N
Eye lvl wnd spd.10 10 9 9 9 8 9 8 8 8 8 8
Eye lvl wnd gst.13 13 13 13 13 13 12 12 12 11 12 12
Surface wnd dir.NE NE NE NE NE NE NE NE NE N N N
Surface wnd spd.16 16 15 15 15 14 15 14 14 14 14 14
Surface wnd gst.22 22 22 21 21 21 20 20 20 18 20 20
Mix hgt (kft)...1.8 1.6 1.6 1.5 1.5 1.4 1.4 1.4 1.4 1.3 1.4 1.3
Transp wind dir.NE NE NE NE NE NE NE NE NE NE NE NE
Transp wind spd.23 23 22 23 22 21 20 18 18 18 18 17
100 ft wind.....
LVORI...........8 7 5 5 5 5 5 5 5 5 5 5
ADI.............1 1 24 26 24 23 22 21 21 21 21 19
Vrate kt-ft/1K..35 33 30 30 28 26 23 22 22 22 22 20
Ventrate Cat....PR PR PR PR PR PR PR PR PR PR PR PR
Wave height (ft)2 2 2 2 2 2 2 2 2 2 2 2
Ceiling (kft)...0.8 0.8 0.8 0.8 0.3 0.8 0.8 0.8 0.8 0.8 0.8 0.8
Visibility (sm).4 3 3 3 2.6 4 4 4 4 5 5 6
Water temp......
.SATURDAY...
Sky/weather.........Mostly cloudy. Patchy fog in the morning.
Patchy fog late in the afternoon. Chance of
showers early in the morning. Slight chance of
showers.
Chance of pcpn......30 percent.
Chance of pcpn......30 percent.
Chance of pcpn......30 percent.
Chance of rain......39 percent.
Chance of thunder...8 percent.
Begin/end of pcpn...
Max temperature.....Around 73.
Min humidity........93 percent.
Max apparent temp...72.
Max apparent temp...72.
Max apparent temp...72.
Eye level winds.....Northeast winds around 8 mph decreasing to 5 to
7 mph around noon, then shifting to the north
around 5 mph early in the afternoon shifting to
the northwest up to 5 mph late in the
afternoon.
Surface winds (mph).North winds around 14 mph shifting to the
northeast 13 to 14 mph in the morning, then
decreasing to 9 to 12 mph around noon shifting
to the north 8 to 9 mph early in the afternoon
shifting to the northwest 7 to 8 mph.
Wind (20 ft)........North winds around 14 mph shifting to the
northeast 13 to 14 mph in the morning, then
decreasing to 9 to 12 mph around noon shifting
to the north 8 to 9 mph early in the afternoon
shifting to the northwest 7 to 8 mph.
100 FT WIND.........
Wave height.........2 feet.
Rainfall amount.....0.25 inches.
Pcpn amount.........0.25 inches.
Snowfall amount.....0.0 inches.
CEILING (KFT).......0.8 increasing to 0.9 early, then increasing to
1.0 in the late morning and afternoon
decreasing to 0.9 late in the afternoon.
Visibility..........4 increasing to 5 late in the morning, then
increasing to 6 early decreasing to 5 late in
the afternoon.
Water temperature...
Mixing height.......1800 ft AGL.
Transport winds.....North 9 to 17 mph.
Smoke dispersal.....Fair (13400 knot-ft).
LVORI...............7.
ADI.................1 to 19.
TIME (EDT) 6AM 7AM 8AM 9AM 10A 11A 12P 1PM 2PM 3PM 4PM 5PM
Sky (%).........90 79 79 79 81 74 73 74 75 61 66 81
Weather cov.....CHC SCH SCH SCH SCH SCH SCH SCH SCH SCH SCH SCH
Weather type....RW RNF RNF RNF RW RW RW RW RW RNF RNF RNF
Tstm cov........
Chc of pcpn (%).30 20 20 20 20 20 20 20 20 20 20 20
Chc of rain (%).30 40 40 30 30 20 30 30 20 30 30 30
Chc of thdr (%).0 0 0 0 0 0 0 0 0 0 0 10
Temp............68 68 68 68 71 71 72 72 72 72 72 71
RH..............100 100 100 100 97 100 97 97 97 97 97 97
Heat index (F)..68 68 68 68 71 71 72 72 72 72 72 71
Wind chill (F)..68 68 68 68 71 71 72 72 72 72 72 71
Aparnt tmp (F)..68 68 68 68 71 71 72 72 72 72 72 71
20 FT wind dir..N N NE NE E NE NE NE N NW NW NW
20 FT wind spd..14 13 14 13 12 12 9 9 9 8 8 7
20 FT wind gust.18 18 17 16 15 14 13 13 12 12 12 10
Eye lvl wnd dir.N N NE NE E NE NE NE N NW NW NW
Eye lvl wnd spd.8 8 8 8 7 7 5 5 5 5 5 4
Eye lvl wnd gst.11 11 10 10 9 8 8 8 7 7 7 6
Surface wnd dir.N N NE NE E NE NE NE N NW NW NW
Surface wnd spd.14 13 14 13 12 12 9 9 9 8 8 7
Surface wnd gst.18 18 17 16 15 14 13 13 12 12 12 10
Mix hgt (kft)...1.4 1.4 1.4 1.7 1.6 1.6 1.8 1.5 1.6 1.7 1.7 1.5
Transp wind dir.NE NE NE NE NE N N N N N N N
Transp wind spd.17 17 17 14 13 12 10 10 10 9 10 12
100 ft wind.....
LVORI...........9 8 9 10 8 9 5 5 5 5 5 4
ADI.............1 1 1 1 1 1 19 17 18 16 18 19
Vrate kt-ft/1K..21 21 21 20 17 16 16 14 15 13 15 15
Ventrate Cat....PR PR PR PR PR PR PR PR PR PR PR PR
Wave height (ft)2 2 2 2 2 2 2 2 1 1 1 1
Ceiling (kft)...0.8 0.8 0.9 0.9 1.0 1.0 1.0 1.1 1.1 1.0 1.0 0.9
Visibility (sm).5 5 4 5 7 8 8 7 7 6 6 5
Water temp......
$$
Forecaster...Belk
Requested by...Joshua Nigro
Type of request...OTHER
.TAG 2620165.0/BOX
.DELDT 08/21/26
.FormatterVersion 2.0.0
.EMAIL Josh.nigro@mass.gov