Spot Forecast
Issued by NWS Boston, MA
Issued by NWS Boston, MA
458
FNUS71 KBOX 020714
FWSBOX
Spot Forecast for Great Swamp RX...RI DEM
National Weather Service Boston/Norton MA
314 AM EDT Thu Oct 2 2025
Forecast is based on ignition time of 0800 EDT on October 02.
If conditions become unrepresentative, contact the National
Weather Service.
.DISCUSSION...
Sunny and dry weather conditions are again expected for today with
governing high pressure in control. The primary changes in the
spot weather forecast for today compared to yesterday are that
northeast winds will be steadily decreasing, starting out around
10 mph at ignition time. Given that the site is sheltered from
northeast winds, the northeast wind speeds shown in the spot
forecast could be an overestimate. Winds will also become light
easterly by late in the day, which could allow for some added
moisture late in the day off adjacent Warden Pond. With a
deepening mixing depth, dewpoints should mix lower, with RHs
falling to around 35 to 40 percent given cooler high temps in the
low to mid 60s. Weak northerly transport winds will likely limit
smoke transport.
.REST OF TODAY...
Sky/weather.........Sunny.
CWR.................0 percent.
Max temperature.....Around 64.
Min humidity........39 percent.
Surface winds (mph).Northeast winds 7 to 10 mph shifting to the
east 6 to 7 mph late in the afternoon.
Wind (20 ft)........North winds around 8 mph shifting to the east 6
to 7 mph late in the afternoon.
Mixing height.......4700 ft AGL.
Transport winds.....Northeast 7 to 16 mph decreasing to around 6
mph late in the afternoon.
Smoke dispersal.....Poor (10100 knot-ft) early in the morning
increasing to good (45600 knot-ft) in the
afternoon.
LVORI...............3.
TIME (EDT) 8AM 9AM 10A 11A 12P 1PM 2PM 3PM 4PM 5PM
Sky (%).........6 2 2 5 9 8 10 9 10 7
Weather cov.....
Weather type....
Tstm cov........
CWR.............0 0 0 0 0 0 0 0 0 0
Temp............48 53 57 59 61 63 63 63 62 61
RH..............80 69 59 53 48 44 41 39 39 41
20 FT wind dir..N N NE NE NE NE NE NE E E
20 FT wind spd..8 9 10 10 9 8 8 7 7 6
20 FT wind gust.17 17 17 16 15 14 13 12 10 9
Surface wnd dir.N N NE NE NE NE NE NE E E
Surface wnd spd.8 9 10 10 9 8 8 7 7 6
Surface wnd gst.17 17 17 16 15 14 13 12 10 9
Mix hgt (kft)...0.9 1.8 3.0 3.6 4.1 4.5 4.7 4.6 4.6 3.9
Transp wind dir.N N NE NE N N NE NE NE NE
Transp wind spd.13 16 15 14 13 12 9 8 7 6
LVORI...........4 3 1 1 1 1 1 1 1 2
Vrate kt-ft/1K..10 25 39 44 46 45 38 33 27 20
Ventrate Cat....PR PR PR FR FR FR PR PR PR PR
.TONIGHT...
Sky/weather.........Mostly clear.
CWR.................0 percent.
Min temperature.....Around 45.
Max humidity........96 percent.
Surface winds (mph).East winds around 5 mph early in the evening
becoming light.
Wind (20 ft)........East winds around 5 mph early in the evening
becoming light.
Mixing height.......400 ft AGL.
Transport winds.....East 3 to 6 mph shifting to the west 5 to 6 mph
early in the morning.
Smoke dispersal.....Poor (1300 knot-ft).
LVORI...............5.
TIME (EDT) 6PM 7PM 8PM 9PM 10P 11P MID 1AM 2AM 3AM 4AM 5AM
Sky (%).........14 20 20 13 14 7 12 12 10 12 23 31
Weather cov.....
Weather type....
Tstm cov........
CWR.............0 0 0 0 0 0 0 0 0 0 0 0
Temp............59 56 53 51 50 49 48 47 47 47 46 46
RH..............44 55 69 74 77 80 83 89 89 89 93 93
20 FT wind dir..E E E E SE SE NE N W NW W W
20 FT wind spd..5 3 3 2 2 2 2 2 2 2 2 2
20 FT wind gust.9 8 7 5 3 3 3 3 3 3 3 3
Surface wnd dir.E E E E SE SE NE N W NW W W
Surface wnd spd.5 3 3 2 2 2 2 2 2 2 2 2
Surface wnd gst.9 8 7 5 3 3 3 3 3 3 3 3
Mix hgt (kft)...1.7 0.7 0.5 0.4 0.4 0.4 0.4 0.4 0.4 0.4 0.4 0.4
Transp wind dir.E E E E E E S S SW SW W W
Transp wind spd.5 6 6 5 5 3 5 3 5 5 5 6
LVORI...........2 2 3 3 4 4 5 7 7 7 7 6
Vrate kt-ft/1K..7 4 3 2 2 1 2 1 2 2 2 2
Ventrate Cat....PR PR PR PR PR PR PR PR PR PR PR PR
.FRIDAY...
Sky/weather.........Sunny.
CWR.................0 percent.
Max temperature.....Around 68.
Min humidity........52 percent.
Surface winds (mph).Light winds becoming southwest 5 to 9 mph in
the late morning and afternoon.
Wind (20 ft)........Southwest winds 5 to 9 mph early in the morning
becoming light, then becoming southwest 5 to 9
mph in the late morning and afternoon.
Mixing height.......3900 ft AGL.
Transport winds.....West 6 to 15 mph.
Smoke dispersal.....Poor (2100 knot-ft) early in the morning
increasing to good (43800 knot-ft) in the
afternoon.
LVORI...............4.
TIME (EDT) 6AM 7AM 8AM 9AM 10A 11A 12P 1PM 2PM 3PM 4PM 5PM
Sky (%).........21 19 11 20 24 27 26 25 24 18 13 7
Weather cov.....
Weather type....
Tstm cov........
CWR.............0 0 0 0 0 0 0 0 0 0 0 0
Temp............46 46 50 56 61 64 66 67 68 68 67 66
RH..............93 96 83 69 62 58 54 54 52 52 54 56
20 FT wind dir..W W W W W SW SW SW SW SW SW SW
20 FT wind spd..2 3 3 3 5 6 7 8 8 9 9 9
20 FT wind gust.3 5 5 6 7 8 10 12 13 13 13 13
Surface wnd dir.W W W W W SW SW SW SW SW SW SW
Surface wnd spd.2 3 3 3 5 6 7 8 8 9 9 9
Surface wnd gst.3 5 5 6 7 8 10 12 13 13 13 13
Mix hgt (kft)...0.4 0.4 0.4 1.3 2.4 3.2 3.7 3.9 3.8 3.7 3.3 2.8
Transp wind dir.W W W W W W W W W W W W
Transp wind spd.6 7 7 9 10 10 12 12 13 14 15 15
LVORI...........6 6 4 3 1 1 1 1 1 1 1 1
Vrate kt-ft/1K..2 2 2 11 21 29 37 39 42 44 43 36
Ventrate Cat....PR PR PR PR PR PR PR PR FR FR FR PR
$$
Forecaster...Loconto
Requested by...Rathbun
Type of request...PRESCRIBED
.TAG 2522860.0/BOX
.DELDT 10/02/25
.FormatterVersion 2.0.0
.EMAIL Gregory.Rathbun@dem.ri.gov