Spot Forecast
Issued by NWS Boston, MA
Issued by NWS Boston, MA
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FNUS71 KBOX 301632
FWSBOX
Spot Forecast for Portsmouth WX...RI DEM
National Weather Service Boston/Norton MA
1232 PM EDT Mon Jun 30 2025
Forecast is based on forecast start time of 1300 EDT on June 30.
If conditions become unrepresentative, contact the National
Weather Service.
.DISCUSSION...
No precipitation is expected today. Light SSE to S winds at 5-12
mph. Relative humidity values in the 55-65 percent range early
afternoon, increasing later this afternoon into the evening. Smoke
dispersal is fair.
Light winds overnight with light winds, high humidity, and patchy
fog. There is a chance for a scattered shower or storm early
Tuesday morning. Warm and humidity Tuesday with relative humidity
values greater than 70 percent. A round or two of scattered
showers and/or storms are possible with a low risk of a stronger
to severe storm. Breezy SW winds with gusts up to 25 mph. Isolated
higher gusts possible within any storms.
.REST OF TODAY...
Sky/weather.........Mostly sunny.
CWR.................0 percent.
Max temperature.....Around 80.
Min humidity........62 percent.
Dewpoint............67.
Max apparent temp...82.
Surface winds (mph).South winds 7 to 9 mph.
Wind (20 ft)........South winds 7 to 9 mph.
Mixing height.......2100 ft AGL.
Transport winds.....South 8 to 12 mph.
Smoke dispersal.....Poor (8400 knot-ft) early in the morning
increasing to fair (14700 knot-ft) in the
afternoon.
LVORI...............3.
ADI.................13 to 22.
CEILING (KFT).......20 increasing to 25 early in the afternoon,
then decreasing to 15 late in the afternoon
decreasing to 9.0 late in the afternoon
decreasing to 1.0.
Eye level winds.....South winds up to 5 mph.
TIME (EDT) 1PM 2PM 3PM 4PM 5PM
Sky (%).........40 51 38 44 29
Weather cov.....
Weather type....
Tstm cov........
CWR.............0 0 0 0 0
Temp............79 80 80 79 79
Dewpoint........67 66 67 68 68
RH..............67 62 65 69 69
Heat index (F)..79 82 82 79 79
20 FT wind dir..S S S S S
20 FT wind spd..7 9 9 9 9
20 FT wind gust.10 13 13 14 14
Eye lvl wnd dir.S S S S S
Eye lvl wnd spd.4 5 5 5 5
Eye lvl wnd gst.6 8 8 8 8
Surface wnd dir.S S S S S
Surface wnd spd.7 9 9 9 9
Surface wnd gst.10 13 13 14 14
Mix hgt (kft)...2.1 1.6 1.2 1.0 0.8
Transp wind dir.S S S S S
Transp wind spd.8 9 10 10 12
LVORI...........3 2 2 3 3
ADI.............22 19 16 14 13
Vrate kt-ft/1K..15 13 10 9 8
Ventrate Cat....PR PR PR PR PR
Ceiling (kft)...20 25 15 9.0 1.0
.TONIGHT...
Sky/weather.........Partly cloudy then becoming mostly cloudy.
Patchy fog early in the morning.
CWR.................0 percent increasing to 50 percent early in the
morning.
Min temperature.....Around 69.
Max humidity........97 percent.
Dewpoint............68.
Max apparent temp...77.
Surface winds (mph).South winds 7 to 9 mph.
Wind (20 ft)........South winds 7 to 9 mph.
Mixing height.......500 ft AGL.
Transport winds.....South 8 to 12 mph.
Smoke dispersal.....Poor (3900 knot-ft).
LVORI...............5.
ADI.................5 to 12.
CEILING (KFT).......3.5 increasing to 6.0 early in the evening,
then increasing to 8.0 early decreasing to 2.0
late in the evening decreasing to 1.5
decreasing to 1.0 decreasing to 0.8 decreasing
to 0.3 early in the morning.
Eye level winds.....South winds up to 5 mph.
TIME (EDT) 6PM 7PM 8PM 9PM 10P 11P MID 1AM 2AM 3AM 4AM 5AM
Sky (%).........31 44 55 64 63 71 67 75 86 81 87 89
Weather cov..... PTY PTY PTY
Weather type.... FOG FOG FOG
Tstm cov........
CWR.............0 0 0 0 0 0 0 0 50 50 50 50
Temp............77 75 73 72 72 71 71 71 71 71 71 71
Dewpoint........68 67 68 68 68 68 68 68 68 69 70 69
RH..............74 76 84 87 87 90 90 90 90 93 97 93
Heat index (F)..77 75 73 72 72 71 71 71 71 71 71 71
20 FT wind dir..S S S S S S S S S S S S
20 FT wind spd..9 8 7 7 7 7 7 7 7 7 8 8
20 FT wind gust.13 12 12 10 10 10 10 10 10 12 13 14
Eye lvl wnd dir.S S S S S S S S S S S S
Eye lvl wnd spd.5 5 4 4 4 4 4 4 4 4 5 5
Eye lvl wnd gst.8 7 7 6 6 6 6 6 6 7 8 8
Surface wnd dir.S S S S S S S S S S S S
Surface wnd spd.9 8 7 7 7 7 7 7 7 7 8 8
Surface wnd gst.13 12 12 10 10 10 10 10 10 12 13 14
Mix hgt (kft)...0.8 0.7 0.8 0.5 0.6 0.6 0.6 0.6 0.6 0.6 0.6 0.5
Transp wind dir.S S S S S S S S S S S S
Transp wind spd.12 12 10 10 9 8 8 9 9 9 10 10
LVORI...........3 4 4 5 5 6 6 6 6 6 6 6
ADI.............12 12 7 7 6 5 5 6 6 6 9 8
Vrate kt-ft/1K..8 7 7 5 4 4 4 5 4 4 5 5
Ventrate Cat....PR PR PR PR PR PR PR PR PR PR PR PR
Ceiling (kft)...3.5 6.0 8.0 2.0 1.5 1.5 1.0 0.8 0.8 0.8 0.3 0.3
.TUESDAY...
Sky/weather.........Mostly cloudy then becoming mostly sunny.
Chance of showers and isolated thunderstorms
through the day. Patchy fog early in the
morning. Patchy fog early in the morning.
CWR.................50 percent decreasing to 33 percent through
early afternoon.
Max temperature.....Around 80.
Min humidity........79 percent.
Dewpoint............71.
Max apparent temp...79.
Surface winds (mph).South winds 8 to 17 mph shifting to the
southwest around 18 mph late in the afternoon.
Wind (20 ft)........Southwest winds 9 to 18 mph. Gusty and erratic
winds expected near thunderstorms.
Mixing height.......1500 ft AGL.
Transport winds.....South 10 to 18 mph shifting to the southwest
around 20 mph late in the afternoon.
Smoke dispersal.....Poor (5000 knot-ft) early in the morning
increasing to fair (23600 knot-ft) in the
afternoon.
LVORI...............5.
ADI.................8 to 35.
CEILING (KFT).......0.3 increasing to 0.8, then increasing to 2.0
early in the afternoon increasing to 3.5 early
in the afternoon increasing to 4.5 decreasing
to 4.0 late in the afternoon.
Eye level winds.....South winds 5 to 10 mph shifting to the
southwest around 11 mph late in the afternoon.
TIME (EDT) 6AM 7AM 8AM 9AM 10A 11A 12P 1PM 2PM 3PM 4PM 5PM
Sky (%).........92 84 92 84 77 65 53 42 33 51 51 51
Weather cov.....SCH CHC CHC CHC CHC SCH SCH SCH SCH CHC CHC CHC
Weather type....RNF RW RW RW RW RW RW RW RW RW RW RW
Tstm cov........ISO ISO ISO ISO ISO ISO ISO ISO ISO ISO ISO ISO
CWR.............50 50 30 30 30 30 30 30 30 30 30 30
Temp............72 72 72 73 74 75 76 77 78 79 79 79
Dewpoint........70 70 71 72 72 72 72 73 73 73 72 72
RH..............93 93 97 97 93 90 87 87 85 82 79 79
Heat index (F)..72 72 72 73 74 75 76 77 78 79 79 79
20 FT wind dir..S S S S S S S SW SW SW SW SW
20 FT wind spd..8 9 10 12 13 14 15 17 18 18 18 18
20 FT wind gust.14 15 15 17 20 22 24 25 26 28 28 28
Eye lvl wnd dir.S S S S S S S SW SW SW SW SW
Eye lvl wnd spd.5 5 6 7 8 8 9 10 11 11 11 11
Eye lvl wnd gst.8 9 9 10 12 13 14 15 16 17 17 17
Surface wnd dir.S S S S S S S SW SW SW SW SW
Surface wnd spd.8 9 10 12 13 14 15 17 18 18 18 18
Surface wnd gst.14 15 15 17 20 22 24 25 26 28 28 28
Mix hgt (kft)...0.6 0.6 0.6 0.8 0.9 1.1 1.3 1.4 1.5 1.5 1.4 1.3
Transp wind dir.S S S S S S S SW SW SW SW SW
Transp wind spd.10 12 10 12 13 14 15 17 18 18 20 20
LVORI...........6 6 6 5 5 4 4 4 4 3 3 3
ADI.............8 9 8 13 16 19 22 31 35 30 31 29
Vrate kt-ft/1K..5 6 5 8 10 13 16 21 24 23 24 22
Ventrate Cat....PR PR PR PR PR PR PR PR PR PR PR PR
Ceiling (kft)...0.3 0.3 0.3 0.3 0.8 0.8 2.0 3.5 4.5 5.0 5.0 4.0
$$
Forecaster...Mensch
Requested by...Ben Arnold
Type of request...WILDFIRE
.TAG 2516966.0/BOX
.DELDT 06/30/25
.FormatterVersion 2.0.0
.EMAIL ben.arnold@dem.ri.gov