831
FNUS71 KBOX 181313
FWSBOX
SPOT FORECAST FOR LYMAN...MASS DCR
NATIONAL WEATHER SERVICE BOSTON/NORTON MA
913 AM EDT FRI APR 18 2025
FORECAST IS BASED ON IGNITION TIME OF 0951 EDT ON APRIL 18.
IF CONDITIONS BECOME UNREPRESENTATIVE, CONTACT THE NATIONAL
WEATHER SERVICE.
DISCUSSION
WINDS ON FRIDAY WILL BE FROM THE SOUTHWEST. THEY WILL START
BETWEEN 5 AND 10 MPH IN THE MORNING, AND THEN GRADUALLY INCREASE
TO BETWEEN 12 AND 17 MPH WITH GUSTS UP TO 22 MPH BY THE AFTERNOON.
RELATIVE HUMIDITY VALUES WILL DROP TO BETWEEN 30 AND 35 PERCENT.
SKY CONDITIONS WILL BE MAINLY CLEAR FOR THE FIRST HALF OF THE DAY
WITH CLOUDS INCREASING LATER IN THE AFTERNOON.
FOR SATURDAY, SOUTHWEST WINDS WILL INCREASE TO 15 TO 20 MPH WITH
GUSTS UP TO 30 MPH. RELATIVE HUMIDITY VALUES WILL FALL TO BETWEEN
65 AND 70 PERCENT BY THE AFTERNOON. THERE WILL BE A SLIGHT CHANCE
OF RAIN SHOWERS LATER IN THE AFTERNOON, BUT CHANCES ARE FAIRLY
LOW. SKIES WILL BE MOSTLY CLOUDY THROUGHOUT MOST OF THE DAY ON
SATURDAY.
REST OF TODAY
SKY/WEATHER.........SUNNY THEN BECOMING PARTLY SUNNY.
CWR.................0 PERCENT.
MAX TEMPERATURE.....AROUND 57.
MIN HUMIDITY........35 PERCENT.
DEWPOINT............32.
MAX APPARENT TEMP...57.
SURFACE WINDS (MPH).LIGHT WINDS BECOMING SOUTHWEST 5 TO 13 MPH WITH
GUSTS TO AROUND 25 MPH IN THE LATE MORNING AND
AFTERNOON.
WIND (20 FT)........LIGHT WINDS BECOMING SOUTHWEST 5 TO 13 MPH WITH
GUSTS TO AROUND 25 MPH IN THE LATE MORNING AND
AFTERNOON.
MIXING HEIGHT.......2300 FT AGL.
TRANSPORT WINDS.....SOUTHWEST 7 TO 14 MPH INCREASING TO 17 TO 24
MPH IN THE AFTERNOON.
SMOKE DISPERSAL.....POOR (6100 KNOT-FT) EARLY IN THE MORNING
INCREASING TO GOOD (37200 KNOT-FT) IN THE
AFTERNOON.
LVORI...............2.
ADI.................9 INCREASING TO 23, THEN INCREASING TO 41 EARLY
INCREASING TO 45 TO 53 IN THE AFTERNOON
DECREASING TO 37.
CEILING (KFT).......25 DECREASING TO 20 LATE IN THE AFTERNOON.
TIME (EDT) 9AM 10A 11A 12P 1PM 2PM 3PM 4PM 5PM
SKY (%).........1 2 4 8 16 20 13 35 54
WEATHER COV.....
WEATHER TYPE....
TSTM COV........
CWR.............0 0 0 0 0 0 0 0 0
TEMP............48 52 55 56 57 57 56 56 54
DEWPOINT........31 31 30 30 30 31 32 33 34
RH..............51 44 38 37 35 37 40 42 46
HEAT INDEX (F)..47 52 55 56 57 57 56 56 54
20 FT WIND DIR..SW SW S SW SW SW SW SW SW
20 FT WIND SPD..3 5 7 8 10 12 13 13 13
20 FT WIND GUST.7 9 13 16 20 23 23 24 25
SURFACE WND DIR.SW SW S SW SW SW SW SW SW
SURFACE WND SPD.3 5 7 8 10 12 13 13 13
SURFACE WND GST.7 9 13 16 20 23 23 24 25
MIX HGT (KFT)...1.0 1.7 2.3 2.3 2.2 1.9 1.7 1.4 1.2
TRANSP WIND DIR.SW SW S SW SW SW SW SW SW
TRANSP WIND SPD.7 10 14 17 20 21 24 24 24
LVORI...........2 2 1 1 1 1 1 1 1
ADI.............9 23 41 51 51 49 53 45 37
VRATE KT-FT/1K..6 16 28 35 37 34 36 30 25
VENTRATE CAT....PR PR PR PR PR PR PR PR PR
CEILING (KFT)...25 25 25 25 25 25 25 25 20
TONIGHT
SKY/WEATHER.........MOSTLY CLOUDY.
CWR.................0 PERCENT.
MIN TEMPERATURE.....AROUND 46.
MAX HUMIDITY........93 PERCENT.
DEWPOINT............36 INCREASING TO 45.
MAX APPARENT TEMP...52.
SURFACE WINDS (MPH).SOUTHWEST WINDS 12 TO 14 MPH WITH GUSTS TO
AROUND 26 MPH.
WIND (20 FT)........SOUTHWEST WINDS 12 TO 14 MPH WITH GUSTS TO
AROUND 26 MPH.
MIXING HEIGHT.......500 FT AGL.
TRANSPORT WINDS.....SOUTHWEST 21 TO 24 MPH.
SMOKE DISPERSAL.....FAIR (16900 KNOT-FT) EARLY IN THE EVENING
DECREASING TO POOR (10400 KNOT-FT) LATE IN THE
NIGHT.
LVORI...............3.
ADI.................19 TO 24.
CEILING (KFT).......15 DECREASING TO 10 UNTIL JUST AFTER MIDNIGHT,
THEN INCREASING TO 14 EARLY IN THE MORNING.
TIME (EDT) 6PM 7PM 8PM 9PM 10P 11P MID 1AM 2AM 3AM 4AM 5AM
SKY (%).........68 82 78 79 77 74 70 66 61 65 69 73
WEATHER COV.....
WEATHER TYPE....
TSTM COV........
CWR.............0 0 0 0 0 0 0 0 0 0 0 0
TEMP............52 51 49 48 48 48 48 48 48 49 49 49
DEWPOINT........35 36 36 37 38 38 40 41 42 43 45 46
RH..............52 56 61 65 68 68 74 77 80 80 86 89
HEAT INDEX (F)..52 51 44 43 43 43 43 43 43 44 44 44
20 FT WIND DIR..SW SW SW SW SW SW SW SW SW SW SW SW
20 FT WIND SPD..12 12 12 12 13 13 13 13 13 13 13 14
20 FT WIND GUST.24 23 24 23 24 25 25 25 25 25 26 26
SURFACE WND DIR.SW SW SW SW SW SW SW SW SW SW SW SW
SURFACE WND SPD.12 12 12 12 13 13 13 13 13 13 13 14
SURFACE WND GST.24 23 24 23 24 25 25 25 25 25 26 26
MIX HGT (KFT)...0.8 0.8 0.7 0.8 0.8 0.8 0.7 0.5 0.7 0.6 0.7 0.8
TRANSP WIND DIR.SW SW SW SW SW SW SW SW SW SW SW SW
TRANSP WIND SPD.22 21 21 22 24 24 22 22 24 22 23 23
LVORI...........2 2 2 3 3 3 3 3 3 3 4 4
ADI.............24 19 19 20 22 22 20 20 22 20 21 21
VRATE KT-FT/1K..15 14 12 15 17 17 13 10 14 12 15 16
VENTRATE CAT....PR PR PR PR PR PR PR PR PR PR PR PR
CEILING (KFT)...15 15 12 12 12 12 11 10 10 11 14 15
SATURDAY
SKY/WEATHER.........PARTLY SUNNY.
CWR.................0 PERCENT.
MAX TEMPERATURE.....AROUND 65.
MIN HUMIDITY........65 PERCENT.
DEWPOINT............49 INCREASING TO 51 LATE IN THE AFTERNOON.
MAX APPARENT TEMP...63.
SURFACE WINDS (MPH).SOUTHWEST WINDS 14 TO 17 MPH WITH GUSTS TO
AROUND 30 MPH.
WIND (20 FT)........SOUTHWEST WINDS 14 TO 17 MPH WITH GUSTS TO
AROUND 30 MPH.
MIXING HEIGHT.......1500 FT AGL.
TRANSPORT WINDS.....SOUTHWEST 22 TO 29 MPH.
SMOKE DISPERSAL.....FAIR (15700 KNOT-FT) EARLY IN THE MORNING
INCREASING TO GOOD (35400 KNOT-FT) IN THE
AFTERNOON.
LVORI...............3.
ADI.................25 TO 31 INCREASING TO 36 TO 45 IN THE LATE
MORNING AND AFTERNOON, THEN DECREASING TO 33
LATE IN THE AFTERNOON.
CEILING (KFT).......20 DECREASING TO 15 IN THE MORNING, THEN
DECREASING TO 11 EARLY DECREASING TO 9.0 EARLY
IN THE AFTERNOON INCREASING TO 10 DECREASING TO
9.0 LATE IN THE AFTERNOON DECREASING TO 8.0.
TIME (EDT) 6AM 7AM 8AM 9AM 10A 11A 12P 1PM 2PM 3PM 4PM 5PM
SKY (%).........71 69 68 69 71 72 65 58 52 54 56 58
WEATHER COV.....
WEATHER TYPE....
TSTM COV........
CWR.............0 0 0 0 0 0 0 0 0 0 0 0
TEMP............49 50 52 56 59 61 62 63 63 63 63 62
DEWPOINT........47 47 48 48 50 51 51 51 52 52 51 51
RH..............93 89 86 74 72 70 67 65 67 67 65 67
HEAT INDEX (F)..44 45 52 56 59 61 62 63 63 63 63 62
20 FT WIND DIR..SW SW SW SW SW SW SW SW SW SW SW SW
20 FT WIND SPD..14 14 14 14 15 16 16 17 17 16 16 15
20 FT WIND GUST.26 26 26 28 29 30 30 30 30 29 29 28
SURFACE WND DIR.SW SW SW SW SW SW SW SW SW SW SW SW
SURFACE WND SPD.14 14 14 14 15 16 16 17 17 16 16 15
SURFACE WND GST.26 26 26 28 29 30 30 30 30 29 29 28
MIX HGT (KFT)...0.8 0.8 0.8 1.3 1.4 1.5 1.4 1.4 1.4 1.3 1.2 1.1
TRANSP WIND DIR.SW SW SW SW SW SW SW SW SW SW SW SW
TRANSP WIND SPD.22 23 28 29 29 28 28 26 26 25 25 25
LVORI...........5 4 4 3 3 3 1 1 1 3 3 3
ADI.............25 26 31 44 45 45 44 42 42 38 36 33
VRATE KT-FT/1K..16 16 19 34 35 35 35 33 32 28 26 23
VENTRATE CAT....PR PR PR PR PR PR PR PR PR PR PR PR
CEILING (KFT)...20 15 15 15 15 11 9.0 10 11 10 9.0 8.0
FORECASTER...FT
REQUESTED BY...MICHAEL MARQUARDT
TYPE OF REQUEST...PRESCRIBED
.TAG 2510163.3/BOX
.DELDT 04/18/25
.FORMATTERVERSION 2.0.0
.EMAIL MICHAEL.MARQUARDT@MASS.GOV
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