708
FNUS71 KBOX 061623
FWSBOX
SPOT FORECAST FOR MENDON ROCK THE BLOCK...MASSACHUSETTS EMA
NATIONAL WEATHER SERVICE BOSTON/NORTON MA
1223 PM EDT SAT SEP 6 2025
FORECAST IS BASED ON FORECAST START TIME OF 1200 EDT ON SEPTEMBER 06.
IF CONDITIONS BECOME UNREPRESENTATIVE, CONTACT THE NATIONAL
WEATHER SERVICE.
DISCUSSION
WARM AND HUMID WEATHER WITH SOUTHERLY BREEZES UP TO 25 MPH ARE
EXPECTED THROUGH THE MIDAFTERNOON HOURS, TO GO ALONG WITH DRY
WEATHER. ALTHOUGH A ROGUE SHOWER OR THUNDERSTORM IS POSSIBLE
THROUGH 5 PM, THE MOST CONCENTRATED PERIOD FOR THUNDERSTORMS
IS BETWEEN 7 AND 11 PM THIS EVENING. LIGHTNING, HEAVY DOWNPOURS
AND BRIEF STRONG WINDS GUSTS ARE POSSIBLE IN THUNDERSTORMS. AFTER
11 PM, THE RISK FOR THUNDERSTORMS DIMINISHES, ALTHOUGH RAIN
SHOWERS WILL CONTINUE AT A STEADY LIGHT INTENSITY FOR THE
OVERNIGHT, WHICH LINGERS INTO SUNDAY MORNING.
REST OF TODAY
SKY/WEATHER.........MOSTLY SUNNY. ISOLATED SHOWERS LATE IN THE
AFTERNOON. SCATTERED SHOWERS LATE IN THE
AFTERNOON. ISOLATED THUNDERSTORMS LATE IN THE
AFTERNOON.
CHANCE OF PCPN......30 PERCENT.
CHANCE OF PCPN......30 PERCENT.
CHANCE OF PCPN......30 PERCENT.
CHANCE OF RAIN......22 PERCENT.
CHANCE OF THUNDER...32 PERCENT.
BEGIN/END OF PCPN...
MAX TEMPERATURE.....AROUND 85.
MIN HUMIDITY........67 PERCENT.
MAX APPARENT TEMP...90.
MAX APPARENT TEMP...90.
MAX APPARENT TEMP...90.
EYE LEVEL WINDS.....SOUTH WINDS 7 TO 8 MPH WITH GUSTS TO AROUND 16
MPH.
SURFACE WINDS (MPH).SOUTH WINDS 12 TO 14 MPH WITH GUSTS TO AROUND
26 MPH.
WIND (20 FT)........SOUTH WINDS 12 TO 14 MPH WITH GUSTS TO AROUND
26 MPH. GUSTY AND ERRATIC WINDS EXPECTED NEAR
THUNDERSTORMS LATE IN THE AFTERNOON.
100 FT WIND.........
RAINFALL AMOUNT.....0.06 INCHES.
PCPN AMOUNT.........0.06 INCHES.
CEILING (KFT).......5.3 INCREASING TO 9.2 EARLY IN THE AFTERNOON,
THEN INCREASING TO 10 LATE IN THE AFTERNOON
DECREASING TO 8.7 LATE IN THE AFTERNOON.
VISIBILITY..........10.
MIXING HEIGHT.......4500 FT AGL.
TRANSPORT WINDS.....SOUTHWEST 21 TO 29 MPH.
SMOKE DISPERSAL.....GOOD (56300 KNOT-FT) EARLY IN THE MORNING
INCREASING TO EXCELLENT (112300 KNOT-FT) IN THE
AFTERNOON.
LVORI...............3.
ADI.................1 EARLY IN THE MORNING INCREASING TO 84 IN THE
AFTERNOON.
TIME (EDT) 12P 1PM 2PM 3PM 4PM 5PM
SKY (%).........46 37 35 49 48 58
WEATHER COV..... ISO SCT SCT
WEATHER TYPE.... RW RW RW
TSTM COV........ ISO
CHC OF PCPN (%).10 10 10 20 30 30
CHC OF RAIN (%).20 20 20 20 20 20
CHC OF THDR (%).0 10 10 20 20 30
TEMP............82 84 84 83 82 79
RH..............72 67 67 67 69 79
HEAT INDEX (F)..87 90 90 88 86 79
WIND CHILL (F)..87 90 90 88 86 79
APARNT TMP (F)..87 90 90 88 86 79
20 FT WIND DIR..S S S S S S
20 FT WIND SPD..12 13 13 13 13 14
20 FT WIND GUST.23 25 25 24 24 26
EYE LVL WND DIR.S S S S S S
EYE LVL WND SPD.7 8 8 8 8 8
EYE LVL WND GST.14 15 15 14 14 16
SURFACE WND DIR.S S S S S S
SURFACE WND SPD.12 13 13 13 13 14
SURFACE WND GST.23 25 25 24 24 26
MIX HGT (KFT)...3.1 4.0 4.5 4.5 3.7 2.9
TRANSP WIND DIR.S S SW SW S SW
TRANSP WIND SPD.21 24 26 29 29 26
100 FT WIND.....
LVORI...........3 1 1 1 1 4
ADI.............51 67 77 84 76 1
VRATE KT-FT/1K..56 85 104 112 91 66
VENTRATE CAT....FR GD VGD VGD GD GD
CEILING (KFT)...5.3 5.8 9.2 10 11 8.7
VISIBILITY (SM).10 10 10 10 10 10
TONIGHT
SKY/WEATHER.........MOSTLY CLOUDY. WIDESPREAD SHOWERS AND SCATTERED
THUNDERSTORMS IN THE EVENING, THEN SHOWERS
LIKELY AND ISOLATED THUNDERSTORMS AFTER
MIDNIGHT.
CHANCE OF PCPN......90 PERCENT.
CHANCE OF PCPN......90 PERCENT.
CHANCE OF PCPN......90 PERCENT.
CHANCE OF RAIN......64 PERCENT.
CHANCE OF THUNDER...42 PERCENT.
BEGIN/END OF PCPN...
MIN TEMPERATURE.....AROUND 58.
MAX HUMIDITY........100 PERCENT.
MAX APPARENT TEMP...76.
MAX APPARENT TEMP...76.
MAX APPARENT TEMP...76.
EYE LEVEL WINDS.....SOUTHWEST WINDS 6 TO 7 MPH WITH GUSTS TO AROUND
14 MPH SHIFTING TO THE WEST UP TO 4 MPH EARLY,
THEN BECOMING LIGHT AROUND MIDNIGHT.
SURFACE WINDS (MPH).SOUTH WINDS AROUND 12 MPH WITH GUSTS TO AROUND
23 MPH EARLY IN THE EVENING SHIFTING TO THE
SOUTHWEST 6 TO 10 MPH WITH GUSTS TO AROUND 21
MPH, THEN SHIFTING TO THE WEST 5 TO 6 MPH LATE
IN THE EVENING BECOMING LIGHT.
WIND (20 FT)........SOUTH WINDS AROUND 12 MPH WITH GUSTS TO AROUND
23 MPH EARLY IN THE EVENING SHIFTING TO THE
SOUTHWEST 6 TO 10 MPH WITH GUSTS TO AROUND 21
MPH, THEN SHIFTING TO THE WEST 5 TO 6 MPH LATE
IN THE EVENING BECOMING LIGHT. GUSTY AND
ERRATIC WINDS EXPECTED NEAR THUNDERSTORMS EARLY
IN THE EVENING. GUSTY AND ERRATIC WINDS
EXPECTED NEAR THUNDERSTORMS EARLY. GUSTY AND
ERRATIC WINDS EXPECTED NEAR THUNDERSTORMS EARLY
IN THE MORNING.
100 FT WIND.........
RAINFALL AMOUNT.....0.30 INCHES.
PCPN AMOUNT.........0.30 INCHES.
CEILING (KFT).......7.7 DECREASING TO 3.6 EARLY IN THE EVENING,
THEN DECREASING TO 1.4 EARLY DECREASING TO 1.2
INCREASING TO 1.7 DECREASING TO 1.0 EARLY IN
THE MORNING DECREASING TO 0.6.
VISIBILITY..........5 INCREASING TO 10 AFTER MIDNIGHT, THEN
DECREASING TO 6 EARLY IN THE MORNING.
MIXING HEIGHT.......400 FT AGL.
TRANSPORT WINDS.....SOUTHWEST 12 TO 21 MPH SHIFTING TO THE WEST 8
TO 10 MPH EARLY, THEN SHIFTING TO THE NORTHWEST
6 TO 8 MPH AROUND MIDNIGHT SHIFTING TO THE
NORTHEAST 5 TO 6 MPH EARLY IN THE MORNING.
SMOKE DISPERSAL.....GOOD (42000 KNOT-FT) EARLY IN THE EVENING
DECREASING TO POOR (2500 KNOT-FT) LATE IN THE
NIGHT.
LVORI...............8.
ADI.................1 TO 10.
TIME (EDT) 6PM 7PM 8PM 9PM 10P 11P MID 1AM 2AM 3AM 4AM 5AM
SKY (%).........70 95 87 84 87 86 88 85 86 89 89 91
WEATHER COV.....NUM WID WID WID LKY LKY LKY LKY LKY LKY LKY LKY
WEATHER TYPE....RW RW RW RW RW RW RW RW RW RW RW RW
TSTM COV........SCT SCT ISO SCH SCH ISO
CHC OF PCPN (%).60 90 90 90 70 60 60 60 60 60 70 70
CHC OF RAIN (%).30 40 30 60 60 50 50 60 40 40 40 50
CHC OF THDR (%).40 40 30 30 30 20 20 20 10 10 10 20
TEMP............76 73 70 68 68 67 65 65 64 62 62 61
RH..............85 93 100 100 97 97 100 100 97 100 100 100
HEAT INDEX (F)..76 73 70 68 68 67 65 65 64 62 62 61
WIND CHILL (F)..76 73 70 68 68 67 65 65 64 62 62 61
APARNT TMP (F)..76 73 70 68 68 67 65 65 64 62 62 61
20 FT WIND DIR..S SW W W NW NW NW N N N N N
20 FT WIND SPD..12 10 6 6 5 3 3 3 3 3 3 3
20 FT WIND GUST.23 21 14 12 10 8 8 8 8 7 8 9
EYE LVL WND DIR.S SW W W NW NW NW N N N N N
EYE LVL WND SPD.7 6 4 4 3 2 2 2 2 2 2 2
EYE LVL WND GST.14 13 8 7 6 5 5 5 5 4 5 5
SURFACE WND DIR.S SW W W NW NW NW N N N N N
SURFACE WND SPD.12 10 6 6 5 3 3 3 3 3 3 3
SURFACE WND GST.23 21 14 12 10 8 8 8 8 7 8 9
MIX HGT (KFT)...2.3 1.1 1.6 1.1 0.9 0.8 0.9 0.4 1.0 0.9 1.0 1.0
TRANSP WIND DIR.SW W W W NW NW NW N N N N NE
TRANSP WIND SPD.21 12 10 8 8 7 7 7 7 6 6 5
100 FT WIND.....
LVORI...........6 6 9 9 7 8 9 9 8 10 10 10
ADI.............1 10 7 5 5 3 3 3 3 3 3 2
VRATE KT-FT/1K..42 11 15 8 7 5 5 3 6 5 5 4
VENTRATE CAT....FR PR PR PR PR PR PR PR PR PR PR PR
CEILING (KFT)...7.7 3.6 1.4 1.8 1.4 1.2 1.7 1.7 1.7 1.9 1.0 0.6
VISIBILITY (SM).6 5 6 6 6 6 10 10 10 10 10 6
FORECASTER...LOCONTO
REQUESTED BY...KYLE GARNER
TYPE OF REQUEST...OTHER
.TAG 2521453.0/BOX
.DELDT 09/06/25
.FORMATTERVERSION 2.0.0
.EMAIL KYLE.GARNER@MASS.GOV
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