Spot Forecast
Issued by NWS Boston, MA
Issued by NWS Boston, MA
510
FNUS71 KBOX 281336
FWSBOX
Spot Forecast for Herman Covey Prescribed Fire...MA Div of Fisheries and Wildlife
National Weather Service Boston/Norton MA
936 AM EDT Thu May 28 2026
Forecast is based on ignition time of 1030 EDT on May 28.
If conditions become unrepresentative, contact the National
Weather Service.
.DISCUSSION...
Partly sunny today with afternoon high temperatures in the 71-76
degree range. Mainly dry weather expected...but a brief isolated
passing shower or two is possible during the afternoon. Winds
will be increasing out of the N-NW at 10 to 15 mph with gusts
between 20 and 25 mph. Minimum afternoon relative humidity values
will drop to between 35 and 40 percent.
.REST OF TODAY...
Sky/weather.........Mostly sunny then becoming partly sunny.
Isolated showers early in the afternoon.
CWR.................0 percent.
Max temperature.....Around 73.
Min humidity........38 percent.
Dewpoint............47 decreasing to 44 late in the afternoon.
Max apparent temp...71.
Surface winds (mph).North winds 9 to 13 mph. Gusts up to 25 mph in
the afternoon.
Wind (20 ft)........North winds 9 to 13 mph. Gusts up to 25 mph in
the afternoon.
Mixing height.......6100 ft AGL.
Transport winds.....North 18 to 24 mph.
Smoke dispersal.....Excellent (82600 knot-ft).
LVORI...............1.
ADI.................68 to 105.
CEILING (KFT).......6.0 decreasing to 5.0 early.
TIME (EDT) 10A 11A 12P 1PM 2PM 3PM 4PM 5PM
Sky (%).........46 53 71 79 74 66 54 48
Weather cov..... ISO ISO ISO
Weather type.... RW RW RW
Tstm cov........
CWR.............0 0 0 0 0 0 0 0
Temp............69 71 71 71 71 71 71 70
Dewpoint........49 48 48 48 47 45 44 44
RH..............49 44 44 44 42 39 38 39
Heat index (F)..69 71 71 71 71 71 71 70
20 FT wind dir..N N N N N N N N
20 FT wind spd..9 10 10 10 12 12 12 13
20 FT wind gust.18 17 18 20 22 23 23 25
Surface wnd dir.N N N N N N N N
Surface wnd spd.9 10 10 10 12 12 12 13
Surface wnd gst.18 17 18 20 22 23 23 25
Mix hgt (kft)...5.2 5.8 5.3 5.4 5.9 5.8 5.5 6.1
Transp wind dir.N N N N N N N N
Transp wind spd.18 18 18 18 21 23 23 24
LVORI...........1 1 1 1 1 1 1 1
ADI.............105 81 78 79 68 75 74 105
Vrate kt-ft/1K..83 93 84 87 105 116 111 128
Ventrate Cat....GD GD GD GD VGD VGD VGD VGD
Ceiling (kft)...6.0 5.0 5.0 5.0 5.0 5.0 5.0 5.0
.TONIGHT...
Sky/weather.........Partly cloudy then becoming mostly cloudy.
CWR.................0 percent.
Min temperature.....Around 47.
Max humidity........93 percent.
Dewpoint............45.
Max apparent temp...69.
Surface winds (mph).North winds 5 to 12 mph with gusts to around 23
mph until early morning becoming light.
Wind (20 ft)........Northwest winds 5 to 9 mph with gusts to around
23 mph until early morning becoming light.
Mixing height.......400 ft AGL.
Transport winds.....North 14 to 23 mph decreasing to 8 to 13 mph
after midnight.
Smoke dispersal.....Excellent (106500 knot-ft) early in the evening
decreasing to poor (7300 knot-ft) late in the
night decreasing to poor (3100 knot-ft) early
in the morning.
LVORI...............4.
ADI.................98 early in the evening decreasing to 4 late in
the night.
CEILING (KFT).......6.0 increasing to 7.0 early in the evening,
then increasing to 8.0 early decreasing to 7.0
late in the evening decreasing to 6.0
decreasing to 4.5 after midnight.
TIME (EDT) 6PM 7PM 8PM 9PM 10P 11P MID 1AM 2AM 3AM 4AM 5AM
Sky (%).........41 24 19 18 17 9 10 20 32 42 59 61
Weather cov.....
Weather type....
Tstm cov........
CWR.............0 0 0 0 0 0 0 0 0 0 0 0
Temp............69 66 63 60 57 55 53 51 50 48 47 47
Dewpoint........44 44 44 45 45 46 46 45 45 45 45 45
RH..............40 45 50 58 64 72 77 80 83 89 93 93
Heat index (F)..69 66 63 60 57 55 53 51 48 46 46 46
20 FT wind dir..N N N N N N N N N NW NW NW
20 FT wind spd..12 9 8 8 7 7 6 6 5 5 3 3
20 FT wind gust.23 21 18 16 15 9 10 9 8 8 9 8
Surface wnd dir.N N N N N N N N N NW NW NW
Surface wnd spd.12 9 8 8 7 7 6 6 5 5 3 3
Surface wnd gst.23 21 18 16 15 9 10 9 8 8 9 8
Mix hgt (kft)...5.3 2.7 1.0 0.9 0.9 0.7 0.8 0.7 0.6 0.5 0.5 0.4
Transp wind dir.N N N N N N N N N N NW NW
Transp wind spd.23 20 15 14 13 13 12 12 9 9 8 8
LVORI...........1 1 2 2 3 3 4 4 5 6 6 6
ADI.............98 66 10 9 6 6 5 5 4 6 4 4
Vrate kt-ft/1K..107 46 12 11 9 8 8 7 5 4 3 3
Ventrate Cat....VGD FR PR PR PR PR PR PR PR PR PR PR
Ceiling (kft)...6.0 7.0 8.0 7.0 6.0 6.0 6.0 5.0 5.0 5.0 4.5 4.5
.FRIDAY...
Sky/weather.........Mostly sunny then becoming mostly cloudy.
CWR.................0 percent increasing to 22 percent late in the
afternoon.
Max temperature.....Around 71.
Min humidity........36 percent.
Dewpoint............45 decreasing to 42 late in the afternoon.
Max apparent temp...70.
Surface winds (mph).Northwest winds 5 to 10 mph. Gusts up to 22 mph
through early afternoon.
Wind (20 ft)........Northwest winds 5 to 10 mph. Gusts up to 22 mph
through early afternoon.
Mixing height.......7500 ft AGL.
Transport winds.....Northwest 9 to 18 mph increasing to 17 to 22
mph early.
Smoke dispersal.....Poor (4600 knot-ft) early in the morning
increasing to excellent (85200 knot-ft) in the
afternoon increasing to excellent (66000
knot-ft) early.
LVORI...............3.
ADI.................7 early in the morning increasing to 105 in the
afternoon.
CEILING (KFT).......6.0 increasing to 8.0 early in the morning,
then increasing to 9.0 early decreasing to 8.0
late in the morning decreasing to 7.0
decreasing to 6.0 early decreasing to 5.0.
TIME (EDT) 6AM 7AM 8AM 9AM 10A 11A 12P 1PM 2PM 3PM 4PM 5PM
Sky (%).........57 54 51 41 32 23 35 48 61 67 73 79
Weather cov.....
Weather type....
Tstm cov........
CWR.............0 0 0 0 0 0 0 0 20 20 20 20
Temp............49 51 55 59 64 66 68 69 70 70 70 70
Dewpoint........45 46 47 45 44 44 43 43 43 42 42 42
RH..............86 83 74 60 48 45 40 39 38 36 36 36
Heat index (F)..47 51 55 59 64 66 68 69 70 70 70 70
20 FT wind dir..NW NW NW NW NW NW NW NW W W W W
20 FT wind spd..5 7 8 9 9 10 10 10 9 9 9 9
20 FT wind gust.12 15 20 21 21 22 21 20 18 18 18 17
Surface wnd dir.NW NW NW NW NW NW NW NW W W W W
Surface wnd spd.5 7 8 9 9 10 10 10 9 9 9 9
Surface wnd gst.12 15 20 21 21 22 21 20 18 18 18 17
Mix hgt (kft)...0.6 1.2 2.7 4.3 5.3 6.7 7.4 7.5 7.1 5.6 6.8 4.4
Transp wind dir.NW NW N NW NW NW NW NW NW W W W
Transp wind spd.9 12 17 18 18 21 22 21 20 18 18 17
LVORI...........5 4 3 1 1 1 1 1 1 1 1 1
ADI.............7 18 58 94 105 105 105 105 93 80 87 67
Vrate kt-ft/1K..5 12 40 69 85 120 140 134 120 89 109 66
Ventrate Cat....PR PR PR GD GD VGD VGD VGD VGD GD VGD GD
Ceiling (kft)...6.0 8.0 9.0 8.0 7.0 6.0 6.0 6.0 6.0 5.0 5.0 5.0
$$
Forecaster...Frank
Requested by...Benjamin Mazzei
Type of request...PRESCRIBED
.TAG 2614582.1/BOX
.DELDT 05/28/26
.FormatterVersion 2.0.0
.EMAIL ben.mazzei@mass.gov