Spot Forecast
Issued by NWS Boston, MA
Issued by NWS Boston, MA
459
FNUS71 KBOX 290013
FWSBOX
Spot Forecast for Pratt Farm Rx...RI DEM
National Weather Service Boston/Norton MA
813 PM EDT Sun Apr 28 2024
Forecast is based on ignition time of 1900 EDT on April 28.
If conditions become unrepresentative, contact the National
Weather Service.
.DISCUSSION...
A cold front slides through southern New England tonight bringing
rain showers. Precipitation amounts are anticipated to remain less
than 0.10 inches tonight for the Pratt Farm Rx area. Maximum
relative humidities of 95 to 100 percent tonight.
Dry and warm conditions Monday for the Pratt Farm area as high
pressure builds in. Winds will be relatively light and the Pratt
Farm area could see a local sea breeze slide in roughly between
12-3 PM. As it does winds will rapidly shift from the north to the
south. Minimum relative humidities of 40 to 50 percent.
.OUTLOOK...Wednesday through Saturday...
Cool conditions Wednesday with a chance of showers as low
pressure tracks to the south. Mainly dry and warmer conditions
Thursday and Friday. Next period of unsettled weather arrives
around Saturday.
.REST OF TONIGHT...
Sky/weather.........Mostly cloudy. Rain showers likely in the
evening. Chance of rain showers, then slight
chance of rain showers. Patchy fog after
midnight.
CWR.................8 percent increasing to 27 percent until just
after midnight, then decreasing to 0 percent
late in the night.
Min temperature.....Around 53.
Max humidity........95 to 100 percent.
Dewpoint............53.
Max apparent temp...60.
Surface winds (mph).Southwest winds 5 to 7 mph in the evening
becoming light.
Wind (20 ft)........Southwest winds around 7 mph decreasing to
around 5 mph early, then becoming light around
midnight.
Mixing height.......0 ft AGL.
Transport winds.....Southwest 5 to 7 mph shifting to the northwest
6 to 7 mph late in the night.
Smoke dispersal.....Poor (300 knot-ft).
LVORI...............6.
ADI.................2 to 5.
Haines Index........3 to 4 or very low to low potential for large
plume dominated fire growth.
CEILING (KFT).......7.0 decreasing to 6.0 early, then decreasing to
4.5 late in the evening decreasing to 3.0
decreasing to 2.5 decreasing to 2.0 after
midnight increasing to 3.0 increasing to 7.0
late in the night.
TIME (EDT) 7PM 8PM 9PM 10P 11P MID 1AM 2AM 3AM 4AM 5AM
Sky (%).........93 94 94 93 92 81 78 74 68 71 54
Weather cov.....LKY LKY LKY CHC SCH PTY PTY PTY PTY PTY PTY
Weather type....RW RW RW RW RNF FOG FOG FOG FOG FOG FOG
Tstm cov........
CWR.............10 30 30 30 30 30 30 0 0 0 0
Temp............60 57 56 55 55 55 56 56 56 56 56
Dewpoint........53 52 52 53 54 53 54 54 55 55 55
RH..............78 83 86 93 96 93 93 93 96 96 96
Heat index (F)..60 57 56 55 55 55 56 56 56 56 56
20 FT wind dir..SW SW SW SW SW W W W W NW NW
20 FT wind spd..7 5 5 5 3 3 3 3 3 3 3
20 FT wind gust.13 14 10 9 8 8 9 9 10 10 10
Surface wnd dir.SW SW SW SW SW W W W W NW NW
Surface wnd spd.7 5 5 5 3 3 3 3 3 3 3
Surface wnd gst.13 14 10 9 8 8 9 9 10 10 10
Mix hgt (kft)...0.6 0.2 0.2 0.1 0.1 0.1 0.1 0.1 0.1 0.1 0.1
Transp wind dir.SW SW SW SW W W W W W W NW
Transp wind spd.7 7 6 7 7 6 6 6 5 6 7
LVORI...........4 5 6 6 8 6 6 6 8 8 8
ADI.............5 5 4 5 3 3 3 3 2 3 3
Haines index....4 3 3 3 3 3 3 3 3 3 3
Vrate kt-ft/1K..4 1 1 1 1 1 1 0 0 0 0
Ventrate Cat....PR PR PR PR PR PR PR PR PR PR PR
Ceiling (kft)...7.0 6.0 4.5 3.0 2.5 2.5 2.0 2.0 2.0 3.0 7.0
.MONDAY...
Sky/weather.........Partly sunny.
CWR.................0 percent.
Max temperature.....Around 74.
Min humidity........40 to 50 percent.
Dewpoint............55 decreasing to 52 late in the afternoon.
Max apparent temp...73.
Surface winds (mph).North winds 5 to 8 mph shifting to the south 5
to 7 mph late in the afternoon.
Wind (20 ft)........Northwest winds around 5 mph shifting to the
north 6 to 8 mph until late afternoon, then
shifting to the south 5 to 7 mph late in the
afternoon.
Mixing height.......2600 ft AGL.
Transport winds.....Northwest 7 to 9 mph shifting to the north 6 to
13 mph through early afternoon, then shifting
to the east around 5 mph late in the afternoon
shifting to the south 6 to 7 mph late in the
afternoon.
Smoke dispersal.....Poor (1200 knot-ft) early in the morning
increasing to fair (21200 knot-ft) in the
afternoon.
LVORI...............4.
ADI.................7 to 13 increasing to 18 to 26 late in the
morning, then increasing to 25 to 30 early
decreasing to 10 to 19 in the afternoon
decreasing to 6.
Haines Index........2 to 3 or very low potential for large plume
dominated fire growth.
CEILING (KFT).......11 increasing to 15 early, then decreasing to
12 decreasing to 8.0 early decreasing to 7.0
decreasing to 6.0 early in the afternoon
decreasing to 4.5.
TIME (EDT) 6AM 7AM 8AM 9AM 10A 11A 12P 1PM 2PM 3PM 4PM 5PM
Sky (%).........48 39 46 49 45 51 54 64 73 77 73 62
Weather cov.....
Weather type....
Tstm cov........
CWR.............0 0 0 0 0 0 0 0 0 0 0 0
Temp............57 59 61 64 67 70 71 73 73 71 69 67
Dewpoint........55 56 57 56 56 55 54 53 52 52 52 52
RH..............93 90 87 75 68 59 55 49 48 51 55 59
Heat index (F)..57 59 61 64 67 70 71 73 73 71 69 67
20 FT wind dir..NW N N N N N N N N S S S
20 FT wind spd..5 7 8 8 8 8 8 7 6 5 6 7
20 FT wind gust.10 10 17 16 17 17 16 14 12 12 13 12
Surface wnd dir.NW N N N N N N N N S S S
Surface wnd spd.5 7 8 8 8 8 8 7 6 5 6 7
Surface wnd gst.10 10 17 16 17 17 16 14 12 12 13 12
Mix hgt (kft)...0.2 0.4 0.5 1.2 1.9 2.6 2.5 2.4 2.2 1.8 1.3 0.9
Transp wind dir.W NW N N N N N N N E S S
Transp wind spd.7 9 13 12 10 9 8 7 6 5 6 7
LVORI...........6 5 4 3 3 2 2 2 2 2 2 3
ADI.............7 10 13 18 26 30 25 19 15 10 10 6
Haines index....3 3 3 3 3 3 3 3 3 3 2 2
Vrate kt-ft/1K..1 3 6 12 17 21 18 14 11 7 7 5
Ventrate Cat....PR PR PR PR PR PR PR PR PR PR PR PR
Ceiling (kft)...11 13 15 15 12 8.0 7.0 6.0 4.5 4.5 4.5 4.5
.MONDAY NIGHT...
Sky/weather.........Partly cloudy then becoming mostly cloudy.
CWR.................0 percent.
Min temperature.....Around 48.
Max humidity........86 percent.
Dewpoint............48 decreasing to 45 early in the morning.
Max apparent temp...63.
Surface winds (mph).South winds 5 to 7 mph in the evening becoming
light.
Wind (20 ft)........South winds around 7 mph decreasing to 5 to 7
mph in the evening, then becoming light around
midnight.
Mixing height.......500 ft AGL.
Transport winds.....South 2 to 7 mph shifting to the southeast 3 to
5 mph early in the morning.
Smoke dispersal.....Poor (1100 knot-ft).
LVORI...............5.
ADI.................1 to 7.
Haines Index........2 to 3 or very low potential for large plume
dominated fire growth.
CEILING (KFT).......4.0 decreasing to 1.5.
TIME (EDT) 6 PM 8 PM 10 PM MIDNGT 2 AM 4 AM
Sky (%).........34 46 64 71 84 84
Weather cov.....
Weather type....NONE NONE NONE NONE NONE NONE
Tstm cov........
CWR.............0 0 0 0 0 0
Temp............63 57 54 51 50 50
Dewpoint........50 48 49 47 45 45
RH..............62 72 83 86 83 83
Heat index (F)..63 57 54 51 50 49
20 ft wind......S 7 S 6 S 5 S 3 S 2 SE 3
20 ft wind gust.12 12 7 6 5 7
Surface wind....S 7 S 6 S 5 S 3 S 2 SE 3
Surface wnd gst.12 12 7 6 5 7
Mix hgt (ft)....800 600 500 500 500 500
Transport wind..S 7 S 7 SW 6 S 3 S 2 SE 3
LVORI...........3 3 5 6 6 5
ADI.............7 5 4 2 1 2
Haines index....2 3 3 3 3 3
Vrate kt-ft/1K..5 3 3 2 1 2
Ventrate Cat....POOR POOR POOR POOR POOR POOR
Ceiling (kft)...4.5 4.5 4.0 3.5 3.5 2.5
.TUESDAY...
Sky/weather.........Mostly cloudy.
CWR.................0 percent.
Max temperature.....Around 59.
Min humidity........59 percent.
Dewpoint............43.
Max apparent temp...57.
Surface winds (mph).Light winds becoming southeast 9 to 10 mph.
Wind (20 ft)........Southeast winds 5 to 10 mph early in the
morning becoming light, then becoming southeast
7 to 9 mph late in the morning increasing to 9
to 10 mph.
Mixing height.......2200 ft AGL.
Transport winds.....Southeast 5 to 12 mph.
Smoke dispersal.....Poor (2200 knot-ft) early in the morning
increasing to fair (21800 knot-ft) in the
afternoon.
LVORI...............3.
ADI.................5 increasing to 24 to 30.
Haines Index........2 to 3 or very low potential for large plume
dominated fire growth.
CEILING (KFT).......2.0 increasing to 2.5 in the late morning and
afternoon.
TIME (EDT) 6 AM 9 AM NOON 3 PM
Sky (%).........84 73 78 73
Weather cov.....
Weather type....NONE NONE NONE NONE
Tstm cov........
CWR.............0 0 0 0
Temp............51 52 56 57
Dewpoint........45 45 45 43
RH..............80 77 66 59
Heat index (F)..51 52 56 57
20 FT wind......E 3G8 E 7G9 SE 9G14 SE 10G14
Surface wind....E 3G8 E 7G9 SE 9G14 SE 10G14
Mix hgt (ft)....600 1500 2200 2000
Transport wind..SE 5 E 8 SE 10 SE 12
LVORI...........4 4 3 2
ADI.............5 16 27 28
Haines index....3 2 2 2
Vrate kt-ft/1K..2 11 20 20
Ventrate Cat....POOR POOR POOR POOR
Ceiling (kft)...2.0 2.5 2.5 2.5
$$
Forecaster...BL
Requested by...Ben Arnold
Type of request...PRESCRIBED
.TAG 2412648.0/BOX
.DELDT 04/28/24
.FormatterVersion 2.0.0
.EMAIL ben.arnold@dem.ri.gov