Spot Forecast
Issued by NWS Boston, MA
Issued by NWS Boston, MA
Versions:
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FNUS71 KBOX 051939
FWSBOX
Spot Forecast for Sterling Fair...MEMA
National Weather Service Boston/Norton MA
339 PM EDT Fri Sep 5 2025
Forecast is based on forecast start time of 1600 EDT on September 05.
If conditions become unrepresentative, contact the National
Weather Service.
.DISCUSSION...
Expecting mainly sunny and dry conditions to round out the rest of
the day today. High temperatures will settle in the mid 80s.
Winds will be from the south between 9 and 12 mph with gusts up to
25 mph at times through the rest of the afternoon. Expecting a
mostly clear night with calming winds. Low temperatures fall into
the mid 60s. Saturday brings a better chance for high-impact
weather. Expecting a dry morning with an increasing chance for
thunderstorms through the afternoon. It looks like a line of
strong to possibly severe storms develops across western
Massachusetts and makes its way eastward. The greatest chance for
thunderstorm activity will be between 2 and 7pm. Risks from storms
will include strong winds, frequent lightning, and a low chance
for a tornado or two. Other concern will gusty winds ahead of any
storm activity. Expecting south winds between 10 and 15 mph with
gusts as high as 30 mph. Storms will exit for the evening and
there will be a chance for showers and steadier rainfall for the
morning hours on Sunday.
.REST OF TODAY...
Sky/weather.........Sunny.
Chance of pcpn......0 percent.
Chance of pcpn......0 percent.
Chance of pcpn......0 percent.
Chance of rain......0 percent.
Chance of thunder...0 percent.
Begin/end of pcpn...
Max temperature.....Around 83.
Min humidity........60 percent.
Max apparent temp...83.
Max apparent temp...83.
Max apparent temp...83.
Eye level winds.....Southwest winds around 6 mph with gusts to
around 13 mph.
Surface winds (mph).Southwest winds around 10 mph with gusts to
around 22 mph.
Wind (20 ft)........Southwest winds around 10 mph with gusts to
around 22 mph.
100 FT WIND.........
Rainfall amount.....0.00 inches.
Pcpn amount.........0.00 inches.
CEILING (KFT).......18 increasing to 24 late in the afternoon.
Visibility..........9.
Water temperature...
Mixing height.......5500 ft AGL.
Transport winds.....Southwest 24 to 25 mph.
Smoke dispersal.....Excellent (115700 knot-ft).
LVORI...............1.
ADI.................77 to 80.
TIME (EDT) 4PM 5PM
Sky (%).........24 13
Weather cov.....
Weather type....
Tstm cov........
Chc of pcpn (%).0 0
Chc of rain (%).0 0
Chc of thdr (%).0 0
Temp............81 80
RH..............60 60
Heat index (F)..83 82
Wind chill (F)..83 82
Aparnt tmp (F)..83 82
20 FT wind dir..SW SW
20 FT wind spd..10 10
20 FT wind gust.22 22
Eye lvl wnd dir.SW SW
Eye lvl wnd spd.6 6
Eye lvl wnd gst.13 13
Surface wnd dir.SW SW
Surface wnd spd.10 10
Surface wnd gst.22 22
Mix hgt (kft)...5.5 5.4
Transp wind dir.SW SW
Transp wind spd.24 25
100 ft wind.....
LVORI...........1 1
ADI.............77 80
Vrate kt-ft/1K..116 118
Ventrate Cat....VGD VGD
Ceiling (kft)...18 24
Visibility (sm).9 9
Water temp......
.TONIGHT...
Sky/weather.........Mostly clear.
Chance of pcpn......0 percent.
Chance of pcpn......0 percent.
Chance of pcpn......0 percent.
Chance of rain......3 percent.
Chance of thunder...3 percent.
Begin/end of pcpn...
Min temperature.....Around 65.
Max humidity........100 percent.
Max apparent temp...78.
Max apparent temp...78.
Max apparent temp...78.
Eye level winds.....South winds up to 6 mph. Gusts up to 22 mph
early in the evening.
Surface winds (mph).South winds 6 to 10 mph. Gusts up to 22 mph
early in the evening.
Wind (20 ft)........South winds 6 to 10 mph. Gusts up to 22 mph
early in the evening.
100 FT WIND.........
Rainfall amount.....0.00 inches.
Pcpn amount.........0.00 inches.
CEILING (KFT).......23 decreasing to 14 early in the morning.
Visibility..........9.
Water temperature...
Mixing height.......700 ft AGL.
Transport winds.....Southwest 15 to 24 mph decreasing to 13 to 14
mph until just after midnight.
Smoke dispersal.....Excellent (88000 knot-ft) early in the evening
decreasing to poor (7200 knot-ft) late in the
night.
LVORI...............4.
ADI.................68 early in the evening decreasing to 6 late in
the night.
TIME (EDT) 6PM 7PM 8PM 9PM 10P 11P MID 1AM 2AM 3AM 4AM 5AM
Sky (%).........9 20 12 9 11 14 6 17 8 11 16 19
Weather cov.....
Weather type....
Tstm cov........
Chc of pcpn (%).0 0 0 0 0 0 0 0 0 0 0 0
Chc of rain (%).0 0 0 0 0 0 0 0 0 0 0 0
Chc of thdr (%).0 0 0 0 0 0 0 0 0 0 0 0
Temp............78 75 72 70 68 68 67 66 67 66 65 65
RH..............64 71 79 81 87 87 90 97 93 93 97 97
Heat index (F)..78 75 72 70 68 68 67 66 67 66 65 65
Wind chill (F)..78 75 72 70 68 68 67 66 67 66 65 65
Aparnt tmp (F)..78 75 72 70 68 68 67 66 67 66 65 65
20 FT wind dir..SW S S S S S S S S S S S
20 FT wind spd..10 9 8 8 8 7 7 6 6 6 6 6
20 FT wind gust.22 21 17 17 17 16 15 14 14 14 14 14
Eye lvl wnd dir.SW S S S S S S S S S S S
Eye lvl wnd spd.6 5 5 5 5 4 4 4 4 4 4 4
Eye lvl wnd gst.13 13 10 10 10 10 9 8 8 8 8 8
Surface wnd dir.SW S S S S S S S S S S S
Surface wnd spd.10 9 8 8 8 7 7 6 6 6 6 6
Surface wnd gst.22 21 17 17 17 16 15 14 14 14 14 14
Mix hgt (kft)...4.2 0.9 0.8 0.7 0.7 0.8 0.7 0.7 0.7 0.7 0.7 0.7
Transp wind dir.SW S SW SW SW SW SW SW SW SW SW SW
Transp wind spd.24 15 14 14 13 13 13 14 13 13 13 13
100 ft wind.....
LVORI...........1 3 4 4 5 5 6 7 6 6 7 7
ADI.............68 10 9 9 8 6 6 6 6 6 6 6
Vrate kt-ft/1K..88 12 9 9 7 8 8 9 8 8 8 8
Ventrate Cat....GD PR PR PR PR PR PR PR PR PR PR PR
Ceiling (kft)...25 25 25 25 25 25 25 24 24 24 23 14
Visibility (sm).9 9 9 9 9 9 9 9 9 9 9 9
Water temp......
.SATURDAY...
Sky/weather.........Sunny then becoming partly sunny. Slight chance
of showers and thunderstorms early in the
afternoon. Chance of showers and thunderstorms
in the afternoon, then showers and
thunderstorms likely late in the afternoon.
Chance of pcpn......60 percent.
Chance of pcpn......60 percent.
Chance of pcpn......60 percent.
Chance of rain......59 percent.
Chance of thunder...43 percent.
Begin/end of pcpn...
Max temperature.....Around 85.
Min humidity........67 percent.
Max apparent temp...88.
Max apparent temp...88.
Max apparent temp...88.
Eye level winds.....South winds up to 7 mph. Gusts up to 26 mph in
the late morning and afternoon.
Surface winds (mph).South winds 6 to 12 mph. Gusts up to 26 mph in
the late morning and afternoon.
Wind (20 ft)........South winds 6 to 12 mph. Gusts up to 26 mph in
the late morning and afternoon. Gusty and
erratic winds expected near thunderstorms.
Gusty and erratic winds expected near
thunderstorms.
100 FT WIND.........
Rainfall amount.....0.44 inches.
Pcpn amount.........0.44 inches.
CEILING (KFT).......13 decreasing to 6.9 early in the morning, then
decreasing to 3.8 early increasing to 4.2 in
the late morning and early afternoon decreasing
to 3.0.
Visibility..........9 decreasing to 2.00 late in the afternoon.
Water temperature...
Mixing height.......4200 ft AGL.
Transport winds.....Southwest 12 to 17 mph increasing to 22 to 28
mph in the afternoon.
Smoke dispersal.....Poor (6800 knot-ft) early in the morning
increasing to excellent (93500 knot-ft) in the
afternoon.
LVORI...............4.
ADI.................1 early in the morning increasing to 61 in the
afternoon.
TIME (EDT) 6AM 7AM 8AM 9AM 10A 11A 12P 1PM 2PM 3PM 4PM 5PM
Sky (%).........28 26 16 23 27 29 33 51 59 64 69 80
Weather cov..... SCH CHC CHC CHC CHC LKY
Weather type.... RW RW RW RW RW RW
Tstm cov........ SCH CHC CHC CHC CHC LKY
Chc of pcpn (%).0 0 0 0 0 10 20 30 40 50 50 60
Chc of rain (%).0 0 20 20 20 20 20 20 20 30 50 60
Chc of thdr (%).0 0 0 0 0 10 10 10 40 40 40 40
Temp............65 65 69 74 77 79 80 83 83 82 80 77
RH..............97 100 93 84 79 77 74 67 70 72 77 82
Heat index (F)..65 65 69 74 77 79 83 88 88 87 84 77
Wind chill (F)..65 65 69 74 77 79 83 88 88 87 84 77
Aparnt tmp (F)..65 65 69 74 77 79 83 88 88 87 84 77
20 FT wind dir..S S S SW S S S S S S SW SW
20 FT wind spd..6 6 7 7 8 9 10 12 12 12 12 10
20 FT wind gust.13 12 14 16 20 21 24 25 26 23 23 26
Eye lvl wnd dir.S S S SW S S S S S S SW SW
Eye lvl wnd spd.4 4 4 4 5 5 6 7 7 7 7 6
Eye lvl wnd gst.8 7 8 10 12 13 14 15 16 14 14 16
Surface wnd dir.S S S SW S S S S S S SW SW
Surface wnd spd.6 6 7 7 8 9 10 12 12 12 12 10
Surface wnd gst.13 12 14 16 20 21 24 25 26 23 23 26
Mix hgt (kft)...0.7 0.7 1.3 1.9 2.4 3.0 3.0 4.1 4.2 4.1 2.8 2.2
Transp wind dir.SW S SW SW S S S S S SW SW SW
Transp wind spd.12 12 13 13 13 15 17 22 23 26 28 24
100 ft wind.....
LVORI...........6 7 5 4 3 3 3 1 4 4 4 6
ADI.............12 12 21 30 38 56 41 61 1 1 1 1
Vrate kt-ft/1K..7 7 14 21 26 39 45 79 84 94 68 46
Ventrate Cat....PR PR PR PR PR PR FR GD GD GD GD FR
Ceiling (kft)...13 6.9 3.8 5.0 4.2 4.8 5.1 5.1 4.8 4.3 3.6 3.0
Visibility (sm).9 9 9 9 9 9 9 9 9 9 9 2.0
Water temp......
$$
Forecaster...FT
Requested by...Chris Depoto
Type of request...OTHER
.TAG 2521395.0/BOX
.DELDT 09/05/25
.FormatterVersion 2.0.0
.EMAIL Christopher.Depoto@mass.gov