Spot Forecast
Issued by NWS Boston, MA
Issued by NWS Boston, MA
Versions:
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458
FNUS71 KBOX 091949
FWSBOX
Spot Forecast for Prudence Rx...RI DEM
National Weather Service Boston/Norton MA
249 PM EST Thu Jan 9 2025
Forecast is based on ignition time of 0700 EST on January 10.
If conditions become unrepresentative, contact the National
Weather Service.
.DISCUSSION...
The general trend will be decreasing winds over the course of the
day Friday. In the morning, NW winds 10-15 mph with gusts 20-25 mph.
Winds are expected to decrease early afternoon (12-2pm) with gusts
20 mph or less through the late afternoon/early evening. No
precipitation is expected Friday with little cloud cover. Given
breezy conditions, smoke dispersal will be good in the afternoon.
Relative humidity values 50-55%, closer to 60% in the AM.
NW winds 5-10 mph Friday night. Snow showers Saturday, light NW
winds.
.FRIDAY...
Sky/weather.........Sunny.
CWR.................0 percent.
Max temperature.....Around 39.
Min humidity........50 percent.
Dewpoint............20.
Min apparent temp...18.
Surface winds (mph).Northwest winds 9 to 14 mph.
Wind (20 ft)........Northwest winds 9 to 14 mph.
Mixing height.......2300 ft AGL.
Transport winds.....Northwest 17 to 26 mph decreasing to 13 to 16
mph late in the afternoon.
Smoke dispersal.....Poor (12400 knot-ft) early in the morning
increasing to good (41900 knot-ft) in the
afternoon.
LVORI...............2.
ADI.................36 to 45 decreasing to 9.
Haines Index........4 or low potential for large plume dominated
fire growth.
CEILING (KFT).......25 decreasing to 20 late in the afternoon.
TIME (EST) 7AM 8AM 9AM 10A 11A 12P 1PM 2PM 3PM 4PM 5PM
Sky (%).........5 5 5 4 7 10 13 16 19 22 27
Weather cov.....
Weather type....
Tstm cov........
CWR.............0 0 0 0 0 0 0 0 0 0 0
Temp............29 29 31 32 34 36 37 38 38 38 37
Dewpoint........18 18 19 19 20 20 21 21 22 22 21
RH..............63 63 61 58 56 52 52 50 52 52 52
Heat index (F)..18 18 21 22 25 28 29 31 31 31 30
20 FT wind dir..NW NW NW NW NW NW NW NW NW NW NW
20 FT wind spd..14 14 14 14 13 13 12 12 10 10 9
20 FT wind gust.23 23 21 21 20 20 21 20 17 14 14
Surface wnd dir.NW NW NW NW NW NW NW NW NW NW NW
Surface wnd spd.14 14 14 14 13 13 12 12 10 10 9
Surface wnd gst.23 23 21 21 20 20 21 20 17 14 14
Mix hgt (kft)...1.4 1.4 1.7 1.8 2.1 2.2 2.2 2.3 2.3 1.8 0.7
Transp wind dir.NW NW NW NW NW N N N N NW NW
Transp wind spd.24 24 26 24 24 22 21 20 17 16 13
LVORI...........1 1 1 1 1 1 1 1 1 2 2
ADI.............38 39 43 43 44 45 44 36 34 23 9
Haines index....4 4 4 4 4 4 4 4 4 4 4
Vrate kt-ft/1K..29 32 36 37 39 42 42 32 23 16 12
Ventrate Cat....PR PR PR PR PR FR FR PR PR PR PR
Ceiling (kft)...25 25 25 25 25 25 25 25 25 25 20
.FRIDAY NIGHT...
Sky/weather.........Partly cloudy then becoming mostly cloudy.
Slight chance of snow early in the morning.
CWR.................0 percent.
Min temperature.....Around 27.
Max humidity........72 percent.
Dewpoint............20.
Min apparent temp...25.
Surface winds (mph).Northwest winds 5 to 8 mph in the evening
becoming light.
Wind (20 ft)........Northwest winds 5 to 7 mph in the evening
becoming light.
Mixing height.......700 ft AGL.
Transport winds.....Northwest 5 to 14 mph.
Smoke dispersal.....Poor (3600 knot-ft).
LVORI...............3.
ADI.................2 to 8.
Haines Index........3 to 4 or very low to low potential for large
plume dominated fire growth.
CEILING (KFT).......20 decreasing to 8.0.
TIME (EST) 6PM 7PM 8PM 9PM 10P 11P MID 1AM 2AM 3AM 4AM 5AM
Sky (%).........31 35 44 54 63 71 79 88 90 92 95 96
Weather cov..... SCH
Weather type.... SN
Tstm cov........
CWR.............0 0 0 0 0 0 0 0 0 0 0 0
Temp............36 34 33 32 31 31 31 31 30 31 31 31
Dewpoint........21 21 20 20 19 19 19 19 19 19 20 20
RH..............54 58 58 61 61 61 61 61 63 61 63 63
Heat index (F)..30 28 27 26 25 26 26 28 26 31 31 31
20 FT wind dir..NW NW NW NW NW NW NW NW NW NW NW NW
20 FT wind spd..8 7 7 6 6 5 5 3 3 2 2 2
20 FT wind gust.12 10 9 8 7 7 6 6 6 5 3 5
Surface wnd dir.NW NW NW NW NW NW NW NW NW NW NW NW
Surface wnd spd.8 7 7 6 6 5 5 3 3 2 2 2
Surface wnd gst.12 10 9 8 7 7 6 6 6 5 3 5
Mix hgt (kft)...0.7 0.7 0.8 0.7 0.7 0.8 0.9 0.9 1.0 1.0 1.0 1.0
Transp wind dir.NW NW NW NW NW NW NW N N NW NW NW
Transp wind spd.14 13 10 9 8 6 6 6 6 5 5 5
LVORI...........2 3 3 3 3 3 3 3 3 3 3 3
ADI.............8 5 8 7 7 6 6 4 3 3 2 2
Haines index....4 4 4 4 4 4 4 4 4 4 4 3
Vrate kt-ft/1K..10 7 7 6 7 6 7 6 5 4 4 4
Ventrate Cat....PR PR PR PR PR PR PR PR PR PR PR PR
Ceiling (kft)...20 20 20 15 15 14 13 12 10 9.0 8.0 8.0
.SATURDAY...
Sky/weather.........Mostly cloudy. Slight chance of snow early in
the morning, then chance of snow until late
afternoon. Slight chance of snow late in the
afternoon.
CWR.................6 percent.
Max temperature.....Around 35.
Min humidity........61 percent.
Dewpoint............23.
Min apparent temp...25.
Surface winds (mph).Light winds becoming northwest 5 to 9 mph in
the late morning and afternoon.
Wind (20 ft)........Northwest winds 5 to 9 mph early in the morning
becoming light, then becoming northwest 5 to 9
mph in the late morning and afternoon.
Mixing height.......2400 ft AGL.
Transport winds.....Northwest 6 to 7 mph increasing to 8 to 13 mph.
Smoke dispersal.....Poor (3500 knot-ft) early in the morning
increasing to fair (22000 knot-ft) in the
afternoon.
LVORI...............4.
ADI.................2 to 9 increasing to 14 to 23.
Haines Index........3 or very low potential for large plume
dominated fire growth.
CEILING (KFT).......7.0 decreasing to 6.0 early, then decreasing to
5.0 late in the morning decreasing to 3.5
decreasing to 3.0 decreasing to 2.5 early in
the afternoon increasing to 3.0.
TIME (EST) 6AM 7AM 8AM 9AM 10A 11A 12P 1PM 2PM 3PM 4PM 5PM
Sky (%).........97 98 97 96 95 91 88 84 82 81 79 74
Weather cov.....SCH CHC CHC CHC CHC CHC CHC CHC CHC SCH SCH SCH
Weather type....SN SN SN SN SN SN SN SN SN SN SN SN
Tstm cov........
CWR.............0 10 10 10 10 10 10 0 0 0 0 0
Temp............30 30 30 30 31 32 32 33 34 34 34 33
Dewpoint........21 22 22 23 25 25 25 25 25 25 25 24
RH..............69 72 72 75 78 75 75 72 69 69 69 69
Heat index (F)..30 30 26 26 26 27 26 28 28 27 27 25
20 FT wind dir..NW W NW NW NW NW N N N N N N
20 FT wind spd..2 2 3 3 5 5 6 6 7 8 9 9
20 FT wind gust.5 5 5 6 6 7 8 9 10 12 13 13
Surface wnd dir.NW W NW NW NW NW N N N N N N
Surface wnd spd.2 2 3 3 5 5 6 6 7 8 9 9
Surface wnd gst.5 5 5 6 6 7 8 9 10 12 13 13
Mix hgt (kft)...1.0 1.0 1.2 1.5 1.8 2.0 2.2 2.4 2.3 2.3 2.2 1.9
Transp wind dir.NW NW W SW SW W NW NW NW N N N
Transp wind spd.6 6 7 7 8 8 8 8 9 10 12 13
LVORI...........3 3 3 3 4 3 3 3 3 3 3 3
ADI.............2 4 9 13 15 15 16 17 19 21 23 14
Haines index....3 3 3 3 3 3 3 3 3 3 3 3
Vrate kt-ft/1K..4 4 6 9 13 14 15 17 19 20 22 21
Ventrate Cat....PR PR PR PR PR PR PR PR PR PR PR PR
Ceiling (kft)...7.0 7.0 6.0 5.0 4.0 3.5 3.0 2.5 3.0 3.0 3.0 3.0
$$
Forecaster...Mensch
Requested by...Iwuc
Type of request...PRESCRIBED
.TAG 2500342.0/BOX
.DELDT 01/10/25
.FormatterVersion 2.0.0
.EMAIL matthew.iwuc@dem.ri.gov