Spot Forecast
Issued by NWS Boston, MA
Issued by NWS Boston, MA
187
FNUS71 KBOX 070845
FWSBOX
Spot Forecast for Common Lands...Mass DCR
National Weather Service Boston/Norton MA
445 AM EDT Thu May 7 2026
Forecast is based on ignition time of 0900 EDT on May 08.
If conditions become unrepresentative, contact the National
Weather Service.
.DISCUSSION...
Quiet and dry conditions expected on Friday into early Saturday.
There is a low probability for a localized sea breeze to develop
on Friday, otherwise light westerly winds. The next chance of
rainfall arrives late Saturday morning into the early afternoon.
.FRIDAY...
Sky/weather.........Mostly sunny.
CWR.................0 percent.
Max temperature.....Around 61.
Min humidity........41 percent.
Dewpoint............35.
Max apparent temp...60.
Surface winds (mph).West winds 5 to 9 mph.
Wind (20 ft)........West winds 5 to 9 mph.
Mixing height.......8000 ft AGL.
Transport winds.....West 14 to 20 mph.
Smoke dispersal.....Good (51700 knot-ft) early in the morning
increasing to excellent (131800 knot-ft) in the
afternoon.
LVORI...............1.
ADI.................75 to 105.
CEILING (KFT).......11 decreasing to 9.0 early in the afternoon,
then increasing to 10 late in the afternoon.
TIME (EDT) 9AM 10A 11A 12P 1PM 2PM 3PM 4PM 5PM
Sky (%).........31 33 40 48 54 55 66 45 37
Weather cov.....
Weather type....
Tstm cov........
CWR.............0 0 0 0 0 0 0 0 0
Temp............50 54 56 58 58 59 59 59 60
Dewpoint........36 36 36 35 36 36 36 36 36
RH..............58 50 47 42 44 42 42 42 41
Heat index (F)..48 54 56 58 58 59 59 59 60
20 FT wind dir..W W W W W W W W W
20 FT wind spd..5 6 6 7 8 9 9 9 9
20 FT wind gust.13 13 13 15 16 17 17 18 18
Surface wnd dir.W W W W W W W W W
Surface wnd spd.5 6 6 7 8 9 9 9 9
Surface wnd gst.13 13 13 15 16 17 17 18 18
Mix hgt (kft)...4.3 5.8 7.0 7.2 8.0 7.8 7.9 7.3 7.7
Transp wind dir.W W W W W W W W W
Transp wind spd.14 15 16 17 18 20 17 17 18
LVORI...........1 1 1 1 1 1 1 1 1
ADI.............75 105 105 105 92 97 86 105 105
Vrate kt-ft/1K..52 75 98 108 128 132 119 110 123
Ventrate Cat....FR GD GD VGD VGD VGD VGD VGD VGD
Ceiling (kft)...13 13 13 12 11 9.0 10 11 12
.FRIDAY NIGHT...
Sky/weather.........Partly cloudy.
CWR.................0 percent.
Min temperature.....Around 44.
Max humidity........82 percent.
Dewpoint............38.
Max apparent temp...58.
Surface winds (mph).West winds 5 to 8 mph early in the evening
becoming light.
Wind (20 ft)........Southwest winds 5 to 6 mph early in the evening
becoming light.
Mixing height.......300 ft AGL.
Transport winds.....West 8 to 14 mph.
Smoke dispersal.....Excellent (66500 knot-ft) early in the evening
decreasing to poor (2400 knot-ft) late in the
night.
LVORI...............3.
ADI.................87 early in the evening decreasing to 4 late in
the night.
CEILING (KFT).......15 increasing to 20 early in the evening, then
increasing to 25 early decreasing to 20 late in
the evening decreasing to 14.
TIME (EDT) 6PM 7PM 8PM 9PM 10P 11P MID 1AM 2AM 3AM 4AM 5AM
Sky (%).........22 27 33 26 22 18 21 24 27 34 42 50
Weather cov.....
Weather type....
Tstm cov........
CWR.............0 0 0 0 0 0 0 0 0 0 0 0
Temp............58 56 54 51 49 48 47 46 45 44 44 44
Dewpoint........37 37 38 38 38 39 39 39 39 39 39 39
RH..............45 49 55 61 66 71 74 76 79 82 82 82
Heat index (F)..58 56 54 51 48 47 46 46 45 44 44 44
20 FT wind dir..W W W W W SW SW SW SW SW SW SW
20 FT wind spd..8 6 5 3 3 3 3 2 2 2 2 2
20 FT wind gust.17 14 12 12 12 12 10 10 9 8 8 8
Surface wnd dir.W W W W W SW SW SW SW SW SW SW
Surface wnd spd.8 6 5 3 3 3 3 2 2 2 2 2
Surface wnd gst.17 14 12 12 12 12 10 10 9 8 8 8
Mix hgt (kft)...5.5 0.8 0.6 0.5 0.4 0.5 0.5 0.4 0.4 0.4 0.3 0.4
Transp wind dir.W W W W W W W W W W W SW
Transp wind spd.14 12 10 9 9 10 10 9 8 8 8 8
LVORI...........1 2 2 3 3 3 3 4 4 5 5 5
ADI.............87 12 5 4 4 5 5 4 4 4 4 4
Vrate kt-ft/1K..67 8 5 4 4 4 4 4 3 3 2 3
Ventrate Cat....GD PR PR PR PR PR PR PR PR PR PR PR
Ceiling (kft)...15 20 25 20 20 15 15 14 14 14 14 14
.SATURDAY...
Sky/weather.........Mostly cloudy. Chance of rain showers in the
morning, then rain showers in the afternoon.
CWR.................0 percent increasing to 98 percent.
Max temperature.....Around 60.
Min humidity........60 percent.
Dewpoint............42 increasing to 46 in the late morning and
afternoon.
Max apparent temp...59.
Surface winds (mph).Light winds becoming south 5 to 12 mph with
gusts to around 23 mph in the late morning and
afternoon.
Wind (20 ft)........South winds 5 to 12 mph early in the morning
becoming light, then becoming south 5 to 12 mph
with gusts to around 23 mph in the late morning
and afternoon.
Mixing height.......4600 ft AGL.
Transport winds.....Southwest 8 to 17 mph shifting to the south 18
to 20 mph in the afternoon.
Smoke dispersal.....Poor (2800 knot-ft) early in the morning
increasing to excellent (72300 knot-ft) in the
afternoon.
LVORI...............3.
ADI.................8 early in the morning increasing to 73 in the
afternoon.
CEILING (KFT).......10 decreasing to 8.0 late in the morning, then
decreasing to 6.0 decreasing to 4.0 early
increasing to 4.5 decreasing to 3.5 late in the
afternoon.
TIME (EDT) 6AM 7AM 8AM 9AM 10A 11A 12P 1PM 2PM 3PM 4PM 5PM
Sky (%).........58 67 75 79 83 87 86 85 84 84 85 90
Weather cov..... SCH CHC CHC CHC CHC CHC LKY LKY DEF DEF
Weather type.... RW RW RW RW RW RW RW RW RW RW
Tstm cov........
CWR.............0 0 10 10 10 10 10 10 100 100 100 100
Temp............46 48 50 53 56 58 59 58 58 57 57 56
Dewpoint........40 42 43 44 45 45 45 46 46 47 47 48
RH..............79 80 77 71 66 62 60 64 64 69 69 74
Heat index (F)..46 48 50 53 56 58 59 58 58 57 57 56
20 FT wind dir..SW SW S S S S S S S S S S
20 FT wind spd..2 2 2 5 7 9 10 12 12 12 12 10
20 FT wind gust.8 8 9 12 15 18 21 21 22 23 23 23
Surface wnd dir.SW SW S S S S S S S S S S
Surface wnd spd.2 2 2 5 7 9 10 12 12 12 12 10
Surface wnd gst.8 8 9 12 15 18 21 21 22 23 23 23
Mix hgt (kft)...0.4 0.6 1.1 2.3 3.7 4.6 4.5 3.9 3.1 2.7 2.2 1.8
Transp wind dir.SW SW S S SW SW SW S S S S S
Transp wind spd.8 8 9 12 15 17 18 20 20 20 18 18
LVORI...........4 4 4 3 1 1 1 1 1 1 3 3
ADI.............8 8 13 33 53 69 73 53 48 44 38 43
Vrate kt-ft/1K..3 4 9 23 48 69 72 66 54 46 36 30
Ventrate Cat....PR PR PR PR FR GD GD GD FR FR PR PR
Ceiling (kft)...12 11 10 8.0 6.0 4.0 4.5 4.5 5.0 4.5 4.0 3.5
$$
Forecaster...Dooley
Requested by...Michael Marquardt
Type of request...PRESCRIBED
.TAG 2612905.0/BOX
.DELDT 05/07/26
.FormatterVersion 2.0.0
.EMAIL michael.marquardt@mass.gov