Spot Forecast
Issued by NWS Boston, MA
Issued by NWS Boston, MA
620
FNUS71 KBOX 290810
FWSBOX
Spot Forecast for Pratt Farm Rx...RI DEM
National Weather Service Boston/Norton MA
410 AM EDT Mon Apr 29 2024
Forecast is based on ignition time of 0900 EDT on April 29.
If conditions become unrepresentative, contact the National
Weather Service.
.DISCUSSION...
This forecast discussion has been tailored for the Pratt Farm
Prescribed burn located in northwest Washington County, RI.
Mainly dry and warm conditions today, highs are 73-76 degrees.
Winds this morning are from the northwest 5-8 knots, a seabreeze
reaches the prescribed burn area between 1PM and 3PM, winds flip
around and are out of the south 8-12 knots.
Winds become light and variable overnight and on Tuesday are
easterly during the morning, before becoming southeast during the
afternoon with wind speeds 8-12 knots.
Cooler Tuesday with the shower threat returning late in the day.
Minimum relative humidities today are be 35 to 45 percent and
Tuesday, minimum relative humidities will be 50 to 60 percent.
.REST OF TODAY...
Sky/weather.........Mostly sunny.
CWR.................0 percent.
Max temperature.....Around 75.
Min humidity........44 percent.
Dewpoint............55 decreasing to 51 in the afternoon.
Max apparent temp...74.
Surface winds (mph).North winds 7 to 8 mph shifting to the
southwest around 7 mph late in the afternoon,
then shifting to the south 8 to 9 mph late in
the afternoon.
Wind (20 ft)........North winds around 8 mph becoming 7 to 8 mph
around noon, then shifting to the southwest
around 7 mph late in the afternoon shifting to
the south 8 to 9 mph late in the afternoon.
Mixing height.......4400 ft AGL.
Transport winds.....North 10 to 15 mph shifting to the northwest
around 8 mph late in the afternoon, then
shifting to the southwest 8 to 9 mph late in
the afternoon.
Smoke dispersal.....Fair (13200 knot-ft) early in the morning
increasing to good (51500 knot-ft) in the
afternoon.
LVORI...............2.
ADI.................35 increasing to 48, then increasing to 59
early increasing to 64 to 71 early in the
afternoon decreasing to 54 decreasing to 38
late in the afternoon decreasing to 20 to 21.
Haines Index........3 or very low potential for large plume
dominated fire growth.
CEILING (KFT).......13 decreasing to 10 early, then increasing to
20 early in the afternoon decreasing to 14
early in the afternoon decreasing to 10
decreasing to 8.0 late in the afternoon.
TIME (EDT) 9AM 10A 11A 12P 1PM 2PM 3PM 4PM 5PM
Sky (%).........36 40 44 47 50 53 50 47 44
Weather cov.....
Weather type....
Tstm cov........
CWR.............0 0 0 0 0 0 0 0 0
Temp............65 68 71 73 74 74 73 71 68
Dewpoint........57 56 55 53 52 51 51 50 50
RH..............75 65 57 49 46 44 46 47 52
Heat index (F)..65 68 71 73 74 74 73 71 68
20 FT wind dir..N N N N NW NW SW S S
20 FT wind spd..8 8 8 8 7 7 7 8 9
20 FT wind gust.14 15 15 14 13 12 12 13 13
Surface wnd dir.N N N N NW NW SW S S
Surface wnd spd.8 8 8 8 7 7 7 8 9
Surface wnd gst.14 15 15 14 13 12 12 13 13
Mix hgt (kft)...2.0 2.8 3.5 4.0 4.2 4.4 3.9 2.0 1.6
Transp wind dir.N N N N N NW NW SW S
Transp wind spd.14 14 14 15 13 10 8 8 9
LVORI...........3 1 1 1 1 1 1 2 2
ADI.............35 48 59 71 64 54 38 21 20
Haines index....3 3 3 3 3 3 3 3 3
Vrate kt-ft/1K..24 33 42 52 47 40 27 14 13
Ventrate Cat....PR PR FR FR FR PR PR PR PR
Ceiling (kft)...15 13 10 20 14 14 11 10 8.0
.TONIGHT...
Sky/weather.........Partly cloudy then becoming mostly cloudy.
Slight chance of rain showers early in the
morning.
CWR.................0 percent.
Min temperature.....Around 48.
Max humidity........80 percent.
Dewpoint............46 decreasing to 43 after midnight.
Max apparent temp...64.
Surface winds (mph).South winds 5 to 9 mph in the evening becoming
light.
Wind (20 ft)........South winds around 9 mph decreasing to 5 to 8
mph in the evening, then becoming light after
midnight.
Mixing height.......600 ft AGL.
Transport winds.....South 7 to 9 mph.
Smoke dispersal.....Poor (3700 knot-ft).
LVORI...............3.
ADI.................8 to 15 decreasing to 3 to 5 until just after
midnight.
Haines Index........2 to 3 or very low potential for large plume
dominated fire growth.
CEILING (KFT).......10 decreasing to 3.0.
TIME (EDT) 6PM 7PM 8PM 9PM 10P 11P MID 1AM 2AM 3AM 4AM 5AM
Sky (%).........42 41 39 44 49 53 62 71 80 82 83 85
Weather cov..... SCH SCH SCH SCH
Weather type.... RW RW RW RW
Tstm cov........
CWR.............0 0 0 0 0 0 0 0 0 0 0 0
Temp............64 60 57 55 53 52 51 50 50 50 50 50
Dewpoint........48 47 46 45 45 44 44 43 43 43 44 44
RH..............56 62 67 69 74 74 77 77 77 77 80 80
Heat index (F)..64 60 57 55 53 52 51 49 49 49 49 49
20 FT wind dir..S S S S S S S S S S SE E
20 FT wind spd..9 8 7 6 6 5 5 3 3 3 3 3
20 FT wind gust.12 12 10 9 8 7 6 6 6 6 7 7
Surface wnd dir.S S S S S S S S S S SE E
Surface wnd spd.9 8 7 6 6 5 5 3 3 3 3 3
Surface wnd gst.12 12 10 9 8 7 6 6 6 6 7 7
Mix hgt (kft)...1.3 1.2 0.8 0.7 0.6 0.6 0.7 0.7 0.7 0.7 0.8 0.8
Transp wind dir.S S S S S S S S S S S S
Transp wind spd.9 9 8 7 7 7 7 7 7 8 8 8
LVORI...........2 3 3 3 3 3 4 4 4 4 4 4
ADI.............15 8 4 5 5 5 5 3 3 4 4 4
Haines index....3 3 3 3 3 3 2 2 2 2 2 2
Vrate kt-ft/1K..10 10 5 4 4 4 4 4 4 5 5 6
Ventrate Cat....PR PR PR PR PR PR PR PR PR PR PR PR
Ceiling (kft)...10 9.0 7.0 6.0 6.0 6.0 5.0 4.0 3.5 3.0 3.0 3.0
.TUESDAY...
Sky/weather.........Mostly cloudy. Slight chance of rain showers
early in the morning.
CWR.................0 percent.
Max temperature.....Around 58.
Min humidity........61 percent.
Dewpoint............43.
Max apparent temp...56.
Surface winds (mph).East winds 5 to 10 mph.
Wind (20 ft)........East winds 5 to 10 mph.
Mixing height.......2000 ft AGL.
Transport winds.....South 8 to 9 mph shifting to the southeast 9 to
13 mph in the late morning and afternoon.
Smoke dispersal.....Poor (5800 knot-ft) early in the morning
increasing to fair (22100 knot-ft) in the
afternoon.
LVORI...............3.
ADI.................7 to 15 increasing to 17 to 26, then decreasing
to 12 early in the afternoon increasing to 31
early in the afternoon decreasing to 13 to 14
increasing to 26 late in the afternoon.
Haines Index........2 or very low potential for large plume
dominated fire growth.
CEILING (KFT).......3.0 decreasing to 2.5 in the morning, then
increasing to 3.0 in the afternoon.
TIME (EDT) 6 AM 8 AM 10 AM NOON 2 PM 4 PM
Sky (%).........86 89 87 83 78 77
Weather cov..... S CHC
Weather type....NONE RNSHWR NONE NONE NONE NONE
Tstm cov........
CWR.............0 0 0 0 0 0
Temp............50 51 53 55 56 55
Dewpoint........44 44 44 44 43 42
RH..............80 77 71 66 62 61
Heat index (F)..48 51 53 55 56 55
20 ft wind......E 5 E 6 E 7 E 9 SE 10 SE 10
20 ft wind gust.7 8 12 13 14 14
Surface wind....E 5 E 6 E 7 E 9 SE 10 SE 10
Surface wnd gst.7 8 12 13 14 14
Mix hgt (ft)....800 1100 1400 1800 2000 1100
Transport wind..S 8 SE 9 E 9 E 12 E 13 SE 10
LVORI...........4 4 3 3 1 2
ADI.............7 12 17 26 31 14
Haines index....2 2 2 2 2 2
Vrate kt-ft/1K..6 9 11 18 22 10
Ventrate Cat....POOR POOR POOR POOR POOR POOR
Ceiling (kft)...3.0 2.5 2.5 2.5 3.0 3.0
$$
Forecaster...Dooley
Requested by...Ben Arnold
Type of request...PRESCRIBED
.TAG 2412648.1/BOX
.DELDT 04/28/24
.FormatterVersion 2.0.0
.EMAIL ben.arnold@dem.ri.gov