339
FNUS71 KBOX 181917
FWSBOX
SPOT FORECAST FOR SPOT WEATHER REQUEST...MEMA
NATIONAL WEATHER SERVICE BOSTON/NORTON MA
317 PM EDT SAT OCT 18 2025
FORECAST IS BASED ON FORECAST START TIME OF 0000 EDT ON OCTOBER 20.
IF CONDITIONS BECOME UNREPRESENTATIVE, CONTACT THE NATIONAL
WEATHER SERVICE.
DISCUSSION
A STRONG COLD FRONT WILL BE WORKING ITS WAY THROUGH THE SPOT
FORECAST LOCATION NEAR BOYLSTON DURING THE MONDAY MORNING HOURS.
RAIN CHANCES MAY START TO INCREASE AS SOON AS EARLY MONDAY
MORNING BUT THE MAJORITY OF THE OVERNIGHT TO EARLY MONDAY MORNING
HOURS END UP DRY. THE STRONGEST CHANCE OF RAINS IS MAINLY DURING
THE 8 AM TO NOON PERIOD MONDAY, WITH GUSTY DOWNPOURS IN THAT
PERIOD OF TIME. THERE IS A LOW (LESS THAN 10%) CHANCE OF LIGHTNING
ACCOMPANYING THIS PERIOD OF SHOWERS - WE CAN'T RULE OUT A ROGUE
LIGHTNING STRIKE BUT THE CHANCES ARE SLIM. SEVERE WEATHER OR
FLOODING IS ALSO NOT EXPECTED WITH THIS ACTIVITY. RAIN AMOUNTS
COULD TOTAL AS MUCH AS THREE- QUARTERS OF AN INCH, WITH SOUTHERLY
WIND GUSTS UP TO 25 MPH NEAR THE BOYLSTON AREA.
RAIN THEN TAPERS OFF INTO THE AFTERNOON WITH DECREASING WIND
SPEEDS AND A WINDSHIFT TO SOUTHWEST BY THE AFTERNOON.
TEMPERATURES WILL BE SLOW TO RISE UNDER CLOUD COVER AND PERIODS OF
RAIN ON MONDAY, WITH HIGH TEMPERATURES IN THE LOW TO MID 60S,
BEFORE GRADUALLY COOLING OFF MONDAY AFTERNOON.
SUNDAY NIGHT / EARLY MONDAY
SKY/WEATHER.........MOSTLY CLOUDY. SLIGHT CHANCE OF RAIN SHOWERS,
THEN CHANCE OF RAIN SHOWERS AFTER MIDNIGHT.
RAIN SHOWERS LIKELY EARLY IN THE MORNING.
CHANCE OF PCPN......60 PERCENT.
CHANCE OF THUNDER...7 PERCENT.
BEGIN/END OF PCPN...
MIN TEMPERATURE.....AROUND 53.
MAX HUMIDITY........100 PERCENT.
MAX APPARENT TEMP...57.
EYE LEVEL WINDS.....SOUTHEAST WINDS AROUND 5 MPH. GUSTS UP TO 20
MPH THEN 21 MPH EARLY IN THE MORNING.
SURFACE WINDS (MPH).SOUTHEAST WINDS AROUND 8 MPH. GUSTS UP TO 20
MPH THEN 21 MPH EARLY IN THE MORNING.
WIND (20 FT)........SOUTHEAST WINDS AROUND 8 MPH. GUSTS UP TO 20
MPH THEN 21 MPH EARLY IN THE MORNING.
100 FT WIND.........
RAINFALL AMOUNT.....0.04 INCHES.
CEILING (KFT).......2.0 DECREASING TO 0.8.
VISIBILITY..........9 DECREASING TO 6 EARLY IN THE MORNING.
MIXING HEIGHT.......500 FT AGL.
TRANSPORT WINDS.....SOUTH 13 TO 16 MPH.
SMOKE DISPERSAL.....POOR (4900 KNOT-FT).
LVORI...............6.
ADI.................11 TO 14.
TIME (EDT) MID 1AM 2AM 3AM 4AM 5AM
SKY (%).........75 82 89 90 91 92
WEATHER COV.....SCH CHC CHC CHC CHC LKY
WEATHER TYPE....RW RW RW RW RW RW
TSTM COV........
CHC OF PCPN (%).20 30 40 40 50 60
CHC OF THDR (%).0 0 0 0 0 10
TEMP............55 56 56 56 57 57
RH..............100 100 100 100 100 100
APARNT TMP (F)..55 56 56 56 57 57
20 FT WIND DIR..S S SE SE SE SE
20 FT WIND SPD..8 8 8 8 8 8
20 FT WIND GUST.20 20 18 20 21 21
EYE LVL WND DIR.S S SE SE SE SE
EYE LVL WND SPD.5 5 5 5 5 5
EYE LVL WND GST.12 12 11 12 13 13
SURFACE WND DIR.S S SE SE SE SE
SURFACE WND SPD.8 8 8 8 8 8
SURFACE WND GST.20 20 18 20 21 21
MIX HGT (KFT)...0.7 0.6 0.5 0.5 0.5 0.5
TRANSP WIND DIR.S S S S S S
TRANSP WIND SPD.16 14 13 13 13 13
100 FT WIND.....
LVORI...........5 7 7 7 7 7
ADI.............14 12 11 11 11 11
VRATE KT-FT/1K..10 8 6 5 5 6
VENTRATE CAT....PR PR PR PR PR PR
CEILING (KFT)...2.0 1.5 0.8 0.8 0.8 0.8
VISIBILITY (SM).9 9 9 9 9 6
MONDAY
SKY/WEATHER.........CLOUDY. RAIN SHOWERS LIKELY EARLY IN THE
MORNING. RAIN SHOWERS THROUGH EARLY AFTERNOON,
THEN RAIN SHOWERS LIKELY LATE IN THE AFTERNOON.
PATCHY FOG EARLY IN THE MORNING.
CHANCE OF PCPN......90 PERCENT.
CHANCE OF THUNDER...8 PERCENT.
BEGIN/END OF PCPN...
MAX TEMPERATURE.....AROUND 64.
MIN HUMIDITY........87 PERCENT.
MAX APPARENT TEMP...62.
EYE LEVEL WINDS.....SOUTHEAST WINDS 5 TO 6 MPH SHIFTING TO THE
SOUTH AROUND 5 MPH LATE IN THE AFTERNOON. GUSTS
UP TO 25 MPH.
SURFACE WINDS (MPH).SOUTHEAST WINDS AROUND 9 MPH SHIFTING TO THE
SOUTH LATE IN THE AFTERNOON. GUSTS UP TO 25
MPH.
WIND (20 FT)........SOUTHEAST WINDS AROUND 9 MPH SHIFTING TO THE
SOUTH LATE IN THE AFTERNOON. GUSTS UP TO 25
MPH.
100 FT WIND.........
RAINFALL AMOUNT.....0.67 INCHES.
CEILING (KFT).......0.8 INCREASING TO 1.9 LATE IN THE MORNING, THEN
INCREASING TO 3.6 INCREASING TO 4.0 EARLY
DECREASING TO 2.4 DECREASING TO 2.2 LATE IN THE
AFTERNOON.
VISIBILITY..........6 DECREASING TO 3 EARLY IN THE MORNING, THEN
DECREASING TO 1.30 LATE IN THE MORNING
INCREASING TO 3 IN THE LATE MORNING AND
AFTERNOON.
MIXING HEIGHT.......2400 FT AGL.
TRANSPORT WINDS.....SOUTHEAST 14 TO 23 MPH SHIFTING TO THE SOUTH 23
TO 24 MPH LATE IN THE AFTERNOON.
SMOKE DISPERSAL.....POOR (7800 KNOT-FT) EARLY IN THE MORNING
INCREASING TO GOOD (48800 KNOT-FT) IN THE
AFTERNOON.
LVORI...............7.
ADI.................1 EARLY IN THE MORNING INCREASING TO 50 IN THE
AFTERNOON.
TIME (EDT) 6AM 7AM 8AM 9AM 10A 11A 12P 1PM 2PM 3PM 4PM 5PM
SKY (%).........91 89 88 89 94 99 95 91 87 83 80 78
WEATHER COV.....LKY LKY DEF DEF DEF DEF DEF DEF DEF LKY LKY LKY
WEATHER TYPE....RW RW RW RW RW RW RW RW RW RW RW RW
TSTM COV........
CHC OF PCPN (%).70 70 80 80 80 90 90 80 80 70 70 70
CHC OF THDR (%).10 10 10 10 10 10 10 10 10 10 10 10
TEMP............58 58 59 60 61 62 62 62 62 62 61 60
RH..............100 100 100 100 100 100 100 100 97 93 90 87
APARNT TMP (F)..58 58 59 60 61 62 62 62 62 62 61 60
20 FT WIND DIR..SE SE SE SE SE SE S S S S S S
20 FT WIND SPD..9 10 10 10 10 10 10 10 10 9 9 9
20 FT WIND GUST.24 25 25 25 24 24 24 23 23 22 21 20
EYE LVL WND DIR.SE SE SE SE SE SE S S S S S S
EYE LVL WND SPD.5 6 6 6 6 6 6 6 6 5 5 5
EYE LVL WND GST.14 15 15 15 14 14 14 14 14 13 13 12
SURFACE WND DIR.SE SE SE SE SE SE S S S S S S
SURFACE WND SPD.9 10 10 10 10 10 10 10 10 9 9 9
SURFACE WND GST.24 25 25 25 24 24 24 23 23 22 21 20
MIX HGT (KFT)...0.6 0.8 1.1 1.4 1.7 2.0 2.2 2.4 2.4 2.3 2.1 1.9
TRANSP WIND DIR.S SE SE SE SE SE SE S S S S S
TRANSP WIND SPD.14 16 17 18 18 20 21 22 23 24 24 23
100 FT WIND.....
LVORI...........7 10 5 4 4 4 4 4 4 4 4 4
ADI.............12 1 23 29 32 37 42 46 49 50 48 43
VRATE KT-FT/1K..8 11 16 22 27 34 40 45 49 49 44 37
VENTRATE CAT....PR PR PR PR PR PR PR FR FR FR FR PR
CEILING (KFT)...0.8 0.8 0.8 1.9 3.6 4.9 4.8 4.0 3.2 2.8 2.4 2.2
VISIBILITY (SM).6 4 3 1.3 3 3 3 3 3 3 3 3
FORECASTER...LOCONTO
REQUESTED BY...MEMA STATE CONTROL
TYPE OF REQUEST...OTHER
.TAG 2523873.0/BOX
.DELDT 10/18/25
.FORMATTERVERSION 2.0.0
.EMAIL MEMA.STATECONTROL@MASS.GOV
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