Suppression Forecast
Issued by NWS Boston, MA
Issued by NWS Boston, MA
897
FNUS71 KBOX 221740
FWSBOX
Spot Forecast for Leyden Prescribed Fire...Masswildlife
National Weather Service Boston/Norton MA
140 PM EDT Tue Apr 22 2025
Forecast is based on ignition time of 1100 EDT on April 23.
If conditions become unrepresentative, contact the National
Weather Service.
.DISCUSSION...
A dry surface pressure trough passage will take place early
Wednesday morning. High pressure will then be establishing itself
over Southern New England and be the main governing driver of
weather conditions near the prescribed burn location in Leyden.
Full sunshine is expected with dry weather and an increasing
mixing depth as temperatures warm into the mid 60s. Lowest
relative humidities will be falling to around 25 to 30 percent.
Expect northwest winds around 10 mph near the Leyden spot
location through sundown, then beginning to weaken to around 5 mph
or less by Wednesday evening. Excellent smoke dispersal is
expected under good mixing during the afternoon hours, with
modest transport towards the southeast towards Eden Trail and the
far southwest portion of Bernardston. As temperatures cool off
Wednesday evening, expect reduced mixing to only a few hundred
feet of the ground as a temperature inversion develops overnight.
.WEDNESDAY...
Sky/weather.........Sunny.
CWR.................0 percent.
Max temperature.....Around 65.
Min humidity........30 percent.
Dewpoint............32.
Max apparent temp...64.
Surface winds (mph).Northwest winds 7 to 8 mph.
Wind (20 ft)........Northwest winds 7 to 8 mph.
Mixing height.......5100 ft AGL.
Transport winds.....Northwest 17 to 18 mph.
Smoke dispersal.....Good (51200 knot-ft) early in the morning
increasing to excellent (81000 knot-ft) in the
afternoon.
LVORI...............1.
ADI.................72 to 80 increasing to 103 to 105.
CEILING (KFT).......25.
TIME (EDT) 11A 12P 1PM 2PM 3PM 4PM 5PM
Sky (%).........4 7 4 5 5 4 7
Weather cov.....
Weather type....
Tstm cov........
CWR.............0 0 0 0 0 0 0
Temp............57 59 60 63 63 64 64
Dewpoint........32 31 31 31 32 33 33
RH..............38 34 33 30 31 31 31
Heat index (F)..57 59 60 63 63 64 64
20 FT wind dir..NW NW NW NW NW NW NW
20 FT wind spd..7 7 8 8 8 8 8
20 FT wind gust.12 13 13 14 13 13 13
Surface wnd dir.NW NW NW NW NW NW NW
Surface wnd spd.7 7 8 8 8 8 8
Surface wnd gst.12 13 13 14 13 13 13
Mix hgt (kft)...3.4 3.9 4.4 4.9 4.9 5.0 5.1
Transp wind dir.NW NW W W W W W
Transp wind spd.17 17 18 18 18 17 17
LVORI...........1 1 1 1 1 1 1
ADI.............72 80 94 102 105 103 105
Vrate kt-ft/1K..51 58 69 76 79 78 81
Ventrate Cat....FR FR GD GD GD GD GD
Ceiling (kft)...25 25 25 25 25 25 25
.WEDNESDAY NIGHT...
Sky/weather.........Mostly clear.
CWR.................0 percent.
Min temperature.....Around 39.
Max humidity........82 percent.
Dewpoint............35.
Max apparent temp...63.
Surface winds (mph).Northwest winds 5 to 8 mph shifting to the
north around 5 mph after midnight, then
becoming light early in the morning.
Wind (20 ft)........Northwest winds around 8 mph early in the
evening shifting to the west 5 to 6 mph, then
shifting to the north around 5 mph after
midnight becoming light.
Mixing height.......200 ft AGL.
Transport winds.....Northwest 7 to 14 mph shifting to the north 5
to 6 mph early in the morning.
Smoke dispersal.....Good (44500 knot-ft) early in the evening
decreasing to poor (1100 knot-ft) late in the
night.
LVORI...............3.
ADI.................62 decreasing to 2 to 5.
CEILING (KFT).......25 decreasing to 20 after midnight.
TIME (EDT) 6PM 7PM 8PM 9PM 10P 11P MID 1AM 2AM 3AM 4AM 5AM
Sky (%).........7 6 10 17 5 4 8 11 15 19 23 27
Weather cov.....
Weather type....
Tstm cov........
CWR.............0 0 0 0 0 0 0 0 0 0 0 0
Temp............63 61 57 54 51 49 47 45 43 42 40 40
Dewpoint........35 36 37 37 37 37 36 36 35 35 35 34
RH..............35 39 47 52 59 63 65 70 73 76 82 79
Heat index (F)..63 61 57 54 51 49 47 45 43 42 40 40
20 FT wind dir..NW W W W W NW NW N N N N N
20 FT wind spd..8 6 5 5 5 5 5 5 5 3 3 2
20 FT wind gust.12 9 7 7 7 6 7 6 6 6 5 3
Surface wnd dir.NW W W W W NW NW N N N N N
Surface wnd spd.8 6 5 5 5 5 5 5 5 3 3 2
Surface wnd gst.12 9 7 7 7 6 7 6 6 6 5 3
Mix hgt (kft)...3.5 2.0 0.4 0.4 0.3 0.2 0.2 0.2 0.2 0.2 0.2 0.2
Transp wind dir.W W W NW NW NW NW N N N N N
Transp wind spd.14 10 7 8 8 8 7 7 6 6 5 5
LVORI...........1 2 2 2 3 3 3 3 3 4 5 4
ADI.............62 5 3 4 4 4 3 3 3 3 2 2
Vrate kt-ft/1K..45 18 2 2 2 2 2 2 1 1 1 1
Ventrate Cat....FR PR PR PR PR PR PR PR PR PR PR PR
Ceiling (kft)...25 25 25 25 25 25 25 20 20 20 20 20
.THURSDAY...
Sky/weather.........Mostly sunny.
CWR.................0 percent.
Max temperature.....Around 70.
Min humidity........39 percent.
Dewpoint............37 increasing to 41 late in the afternoon.
Max apparent temp...68.
Surface winds (mph).Light winds becoming southwest 5 to 6 mph in
the afternoon.
Wind (20 ft)........Light winds becoming southwest 5 to 6 mph in
the afternoon.
Mixing height.......5000 ft AGL.
Transport winds.....Northeast 3 to 6 mph shifting to the west 9 to
12 mph, then shifting to the southwest 13 to 16
mph in the afternoon.
Smoke dispersal.....Poor (1900 knot-ft) early in the morning
increasing to excellent (70500 knot-ft) in the
afternoon.
LVORI...............3.
ADI.................3 to 12 increasing to 94.
CEILING (KFT).......14 decreasing to 10 in the late morning and
afternoon.
TIME (EDT) 6AM 7AM 8AM 9AM 10A 11A 12P 1PM 2PM 3PM 4PM 5PM
Sky (%).........28 29 30 18 18 19 25 31 38 38 37 37
Weather cov.....
Weather type....
Tstm cov........
CWR.............0 0 0 0 0 0 0 0 0 0 0 0
Temp............42 44 46 50 54 57 59 61 63 65 67 68
Dewpoint........35 36 37 38 38 38 38 39 40 40 41 42
RH..............76 73 71 63 54 49 45 44 43 40 39 39
Heat index (F)..42 44 46 50 54 57 59 61 63 65 67 68
20 FT wind dir..N N NE NW W SW SW SW SW SW SW SW
20 FT wind spd..2 1 1 1 3 3 3 5 5 5 6 6
20 FT wind gust.3 3 3 5 6 7 8 9 10 10 12 12
Surface wnd dir.N N NE NW W SW SW SW SW SW SW SW
Surface wnd spd.2 1 1 1 3 3 3 5 5 5 6 6
Surface wnd gst.3 3 3 5 6 7 8 9 10 10 12 12
Mix hgt (kft)...0.4 0.6 0.9 1.6 2.4 3.2 3.2 3.2 3.2 3.8 4.4 5.0
Transp wind dir.N NE NE N W W SW SW SW SW SW SW
Transp wind spd.5 3 3 6 9 12 12 13 13 14 15 16
LVORI...........4 3 3 2 2 1 1 1 1 1 1 1
ADI.............5 3 4 12 28 45 45 49 50 63 78 94
Vrate kt-ft/1K..2 2 3 8 19 32 32 35 35 46 58 71
Ventrate Cat....PR PR PR PR PR PR PR PR PR FR FR GD
Ceiling (kft)...15 15 15 14 12 11 11 10 10 10 10 10
$$
Forecaster...Loconto
Requested by...Benjamin Mazzei
Type of request...PRESCRIBED
.TAG 2511354.0/BOX
.DELDT 04/23/25
.FormatterVersion 2.0.0
.EMAIL ben.mazzei@mass.gov