631  
FNUS71 KBOX 292204  
FWSBOX  
 
SPOT FORECAST FOR SPENCER FAIR...MEMA  
NATIONAL WEATHER SERVICE BOSTON/NORTON MA  
604 PM EDT FRI AUG 29 2025  
 
FORECAST IS BASED ON FORECAST START TIME OF 1800 EDT ON AUGUST 29.  
IF CONDITIONS BECOME UNREPRESENTATIVE, CONTACT THE NATIONAL  
WEATHER SERVICE.  
   
DISCUSSION
 
 
SHOWERS AND SCATTERED THUNDERSTORMS ARE MOVING TO THE EAST AT 6  
PM. OTHER THAN AN ISOLATED SHOWER THIS EVENING, EXPECT GRADUAL  
CLEARING THROUGH THE NIGHT WITH WINDS SHIFTING TO NW AROUND 10 MPH  
AFTER 8 PM. TEMPERATURES WILL FALL INTO THE UPPER 50S LATER THIS  
EVENING.  
   
TONIGHT
 
 
SKY/WEATHER.........MOSTLY CLOUDY THEN BECOMING PARTLY CLOUDY.  
CHANCE OF RAIN SHOWERS AND ISOLATED  
THUNDERSTORMS EARLY IN THE EVENING, THEN SLIGHT  
CHANCE OF RAIN SHOWERS EARLY IN THE EVENING.  
CHANCE OF PCPN......40 PERCENT.  
CHANCE OF RAIN......51 PERCENT.  
CHANCE OF THUNDER...37 PERCENT.  
MIN TEMPERATURE.....AROUND 47.  
MAX HUMIDITY........100 PERCENT.  
MAX APPARENT TEMP...65.  
EYE LEVEL WINDS.....SOUTHWEST WINDS UP TO 4 MPH EARLY IN THE  
EVENING BECOMING LIGHT, THEN BECOMING NORTHWEST  
AROUND 3 MPH LATE IN THE NIGHT.  
SURFACE WINDS (MPH).SOUTHWEST WINDS AROUND 6 MPH DECREASING TO  
AROUND 5 MPH EARLY IN THE EVENING, THEN  
BECOMING LIGHT UNTIL JUST AFTER MIDNIGHT  
BECOMING NORTHWEST AROUND 5 MPH LATE IN THE  
NIGHT.  
WIND (20 FT)........SOUTHWEST WINDS AROUND 6 MPH DECREASING TO  
AROUND 5 MPH EARLY IN THE EVENING, THEN  
BECOMING LIGHT UNTIL JUST AFTER MIDNIGHT  
BECOMING NORTHWEST AROUND 5 MPH LATE IN THE  
NIGHT. GUSTY AND ERRATIC WINDS EXPECTED NEAR  
THUNDERSTORMS EARLY IN THE EVENING.  
RAINFALL AMOUNT.....0.05 INCHES.  
CEILING (KFT).......7.9 DECREASING TO 6.7 EARLY IN THE EVENING,  
THEN INCREASING TO 9.7 EARLY DECREASING TO 6.6  
LATE IN THE EVENING INCREASING TO 11 INCREASING  
TO 16 INCREASING TO 21 DECREASING TO 18 LATE IN  
THE NIGHT.  
VISIBILITY..........9.  
MIXING HEIGHT.......500 FT AGL.  
TRANSPORT WINDS.....WEST 5 TO 8 MPH SHIFTING TO THE NORTHWEST 8 TO  
10 MPH IN THE LATE EVENING AND OVERNIGHT.  
SMOKE DISPERSAL.....POOR (2600 KNOT-FT).  
LVORI...............7.  
ADI.................3 TO 14.  
 
TIME (EDT) 6PM 7PM 8PM 9PM 10P 11P MID 1AM 2AM 3AM 4AM 5AM  
SKY (%).........64 61 47 40 37 33 23 26 29 30 30 19  
WEATHER COV.....CHC SCH  
WEATHER TYPE....RW RW  
TSTM COV........ISO  
CHC OF PCPN (%).40 20 10 10 10 10 10 10 10 10 10 10  
CHC OF RAIN (%).50 40 50 30 20 10 10 0 0 0 0 0  
CHC OF THDR (%).40 40 10 10 10 0 0 0 0 0 0 0  
TEMP............65 63 60 58 57 56 54 53 52 50 49 48  
RH..............84 93 93 100 100 93 96 96 96 100 100 100  
APARNT TMP (F)..65 63 60 58 57 56 54 53 52 49 47 46  
20 FT WIND DIR..SW SW W W NW NW NW NW NW NW NW NW  
20 FT WIND SPD..6 5 3 2 2 3 3 3 3 3 5 5  
20 FT WIND GUST.10 8 7 7 7 7 8 8 9 9 9 9  
EYE LVL WND DIR.SW SW W W NW NW NW NW NW NW NW NW  
EYE LVL WND SPD.4 3 2 1 1 2 2 2 2 2 3 3  
EYE LVL WND GST.6 5 4 4 4 4 5 5 5 5 5 5  
SURFACE WND DIR.SW SW W W NW NW NW NW NW NW NW NW  
SURFACE WND SPD.6 5 3 2 2 3 3 3 3 3 5 5  
SURFACE WND GST.10 8 7 7 7 7 8 8 9 9 9 9  
MIX HGT (KFT)...1.8 0.7 0.6 0.6 0.6 0.6 0.6 0.6 0.6 0.5 0.6 0.5  
TRANSP WIND DIR.SW W W NW NW NW NW NW NW NW NW NW  
TRANSP WIND SPD.8 5 8 9 10 10 10 10 9 9 9 8  
LVORI...........4 6 6 9 9 6 8 8 8 9 9 9  
ADI.............14 3 4 4 5 5 5 5 4 4 4 4  
VRATE KT-FT/1K..12 3 4 5 5 5 5 5 4 4 4 4  
VENTRATE CAT....PR PR PR PR PR PR PR PR PR PR PR PR  
CEILING (KFT)...7.9 6.7 9.7 6.6 6.7 7.5 11 16 23 21 18 18  
VISIBILITY (SM).9 9 9 9 9 9 9 9 9 9 9 9  
 

 
FORECASTER...KJC  
REQUESTED BY...MEMA STATE CONTROL  
TYPE OF REQUEST...OTHER  
.TAG 2520954.0/BOX  
.DELDT 08/29/25  
.FORMATTERVERSION 2.0.0  
.EMAIL MEMA.STATECONTROL@MASS.GOV  
 
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