398
FNUS71 KBOX 291452
FWSBOX

Spot Forecast for Spencer Fair...Mass Emergency Management
National Weather Service Boston/Norton MA
1052 AM EDT Fri Aug 29 2025

Forecast is based on forecast start time of 1100 EDT on August 29.
If conditions become unrepresentative, contact the National
Weather Service.

.DISCUSSION...
Dry weather is expected through midday but showers and
thunderstorms are likely between 12 PM and 3 PM.

.REST OF TODAY...

Sky/weather.........Mostly cloudy. Chance of showers early, then
                    showers and chance of thunderstorms in the
                    afternoon.
Chance of pcpn......80 percent.
Chance of pcpn......80 percent.
Chance of pcpn......80 percent.
Chance of rain......73 percent.
Chance of thunder...25 percent.
Begin/end of pcpn...
Max temperature.....Around 71.
Min humidity........76 percent.
Max apparent temp...69.
Max apparent temp...69.
Max apparent temp...69.
Eye level winds.....Southwest winds around 6 mph.
Surface winds (mph).Southwest winds around 10 mph.
Wind (20 ft)........Southwest winds around 10 mph. Gusty and
                    erratic winds expected near thunderstorms early
                    in the afternoon. Gusty and erratic winds
                    expected near thunderstorms late in the
                    afternoon.
100 FT WIND.........
Wave height.........Less than 1 foot.
Rainfall amount.....0.44 inches.
Pcpn amount.........0.44 inches.
Snowfall amount.....0.0 inches.
CEILING (KFT).......7.0 decreasing to 5.0.
Visibility..........10.
Water temperature...
Mixing height.......3900 ft AGL.
Transport winds.....Southwest 10 to 17 mph.
Smoke dispersal.....Fair (18400 knot-ft) early in the morning
                    increasing to good (54700 knot-ft) in the
                    afternoon.
LVORI...............3.
ADI.................20 to 59.

TIME (EDT)      11A 12P 1PM 2PM 3PM 4PM 5PM
Sky (%).........71  78  81  86  83  78  72
Weather cov.....CHC CHC LKY DEF LKY LKY CHC
Weather type....RW  RW  RW  RW  RW  RW  RW
Tstm cov........    ISO CHC CHC ISO ISO ISO
Chc of pcpn (%).40  50  60  80  70  60  50
Chc of rain (%).30  40  70  60  60  60  50
Chc of thdr (%).10  10  30  30  10  10  10
Temp............67  68  68  68  69  68  67
RH..............78  76  76  76  76  76  81
Heat index (F)..67  68  68  68  69  68  67
Wind chill (F)..67  68  68  68  69  68  67
Aparnt tmp (F)..67  68  68  68  69  68  67
20 FT wind dir..SW  SW  SW  SW  SW  SW  W
20 FT wind spd..10  10  10  10  10  10  10
20 FT wind gust.18  18  17  16  15  14  13
Eye lvl wnd dir.SW  SW  SW  SW  SW  SW  W
Eye lvl wnd spd.6   6   6   6   6   6   6
Eye lvl wnd gst.11  11  10  10  9   8   8
Surface wnd dir.SW  SW  SW  SW  SW  SW  W
Surface wnd spd.10  10  10  10  10  10  10
Surface wnd gst.18  18  17  16  15  14  13
Mix hgt (kft)...3.4 3.9 3.2 3.1 2.8 2.6 2.0
Transp wind dir.S   S   S   S   S   SW  SW
Transp wind spd.17  16  14  14  13  13  10
100 ft wind.....
LVORI...........3   3   3   3   3   3   3
ADI.............59  44  34  34  29  28  20
Vrate kt-ft/1K..51  55  39  38  31  29  18
Ventrate Cat....FR  FR  PR  PR  PR  PR  PR
Wave height (ft)0   0   0   0   0   0   0
Ceiling (kft)...7.0 6.0 6.0 5.0 5.0 5.0 5.0
Visibility (sm).10  10  10  10  10  10  10
Water temp......

.TONIGHT...

Sky/weather.........Mostly cloudy then becoming partly cloudy.
                    Chance of rain showers early in the evening,
                    then slight chance of rain showers early in the
                    evening.
Chance of pcpn......40 percent.
Chance of pcpn......40 percent.
Chance of pcpn......40 percent.
Chance of rain......34 percent.
Chance of thunder...0 percent.
Begin/end of pcpn...
Min temperature.....Around 46.
Max humidity........100 percent.
Max apparent temp...66.
Max apparent temp...66.
Max apparent temp...66.
Eye level winds.....West winds up to 5 mph.
Surface winds (mph).West winds 6 to 9 mph.
Wind (20 ft)........West winds 6 to 9 mph.
100 FT WIND.........
Wave height.........Less than 1 foot.
Rainfall amount.....0.09 inches.
Pcpn amount.........0.09 inches.
Snowfall amount.....0.0 inches.
CEILING (KFT).......5.0 increasing to 20.
Visibility..........10.
Water temperature...
Mixing height.......500 ft AGL.
Transport winds.....West 7 to 9 mph shifting to the northwest 9 to
                    10 mph after midnight.
Smoke dispersal.....Poor (3300 knot-ft).
LVORI...............6.
ADI.................4 to 15.

TIME (EDT)      6PM 7PM 8PM 9PM 10P 11P MID 1AM 2AM 3AM 4AM 5AM
Sky (%).........66  59  50  27  37  34  23  18  14  17  10  9
Weather cov.....CHC SCH
Weather type....RW  RW
Tstm cov........
Chc of pcpn (%).40  20  10  10  10  10  10  10  10  10  10  10
Chc of rain (%).30  30  30  20  20  20  20  20  0   0   0   0
Chc of thdr (%).0   0   0   0   0   0   0   0   0   0   0   0
Temp............66  63  61  57  56  55  54  53  51  49  48  47
RH..............78  87  87  93  93  90  86  86  89  93  96  96
Heat index (F)..66  63  61  57  56  55  54  53  51  47  45  44
Wind chill (F)..66  63  61  57  56  55  54  53  51  47  45  44
Aparnt tmp (F)..66  63  61  57  56  55  54  53  51  47  45  44
20 FT wind dir..W   W   W   W   W   W   W   NW  NW  NW  NW  NW
20 FT wind spd..9   7   6   6   6   6   6   6   6   6   6   6
20 FT wind gust.10  8   9   12  12  9   10  9   8   9   10  10
Eye lvl wnd dir.W   W   W   W   W   W   W   NW  NW  NW  NW  NW
Eye lvl wnd spd.5   4   4   4   4   4   4   4   4   4   4   4
Eye lvl wnd gst.6   5   5   7   7   5   6   5   5   5   6   6
Surface wnd dir.W   W   W   W   W   W   W   NW  NW  NW  NW  NW
Surface wnd spd.9   7   6   6   6   6   6   6   6   6   6   6
Surface wnd gst.10  8   9   12  12  9   10  9   8   9   10  10
Mix hgt (kft)...1.4 0.6 0.6 0.6 0.6 0.6 0.6 0.6 0.6 0.6 0.6 0.5
Transp wind dir.W   W   W   NW  NW  NW  NW  NW  NW  NW  NW  NW
Transp wind spd.9   7   7   9   9   10  9   10  9   9   9   9
100 ft wind.....
LVORI...........4   5   5   6   6   6   6   5   6   6   8   8
ADI.............15  8   5   4   4   5   4   5   4   4   4   4
Vrate kt-ft/1K..11  4   3   4   5   5   5   5   4   4   4   4
Ventrate Cat....PR  PR  PR  PR  PR  PR  PR  PR  PR  PR  PR  PR
Wave height (ft)0   0   0   0   0   0   0   0   0   0   0   0
Ceiling (kft)...5.0 5.0 5.0 5.0 5.0 6.0 9.0 13  15  15  15  20
Visibility (sm).10  10  10  10  10  10  10  10  10  10  10  10
Water temp......

$$
Forecaster...JWD
Requested by...Alex Riddell
Type of request...OTHER
.TAG 2520935.0/BOX
.DELDT 08/29/25
.FormatterVersion 2.0.0
.EMAIL Christopher.Bouchard@mass.gov,paula.cutten@mass.gov,Kevin.Filchak@mass.gov