599
FNUS71 KBOX 180835
FWSBOX
SPOT FORECAST FOR LYMAN...MASS DCR
NATIONAL WEATHER SERVICE BOSTON/NORTON MA
410 AM EDT FRI APR 18 2025
FORECAST IS BASED ON IGNITION TIME OF 0400 EDT ON APRIL 18.
IF CONDITIONS BECOME UNREPRESENTATIVE, CONTACT THE NATIONAL
WEATHER SERVICE.
DISCUSSION
DRY TODAY WITH AN INCREASING SOUTH TO SOUTHWEST WIND THIS MORNING.
WIND GUSTS UP TO 30 MPH THIS AFTERNOON. MINIMUM RELATIVE HUMIDITY
AROUND 25 PERCENT. LOW RISK FOR A SPOT SHOWER LATE IN THE DAY INTO
TONIGHT, BUT NOT A WETTING RAINFALL.
REST OF TONIGHT
SKY/WEATHER.........CLEAR.
CWR.................0 PERCENT.
MIN TEMPERATURE.....AROUND 34.
MAX HUMIDITY........78 PERCENT.
WIND (20 FT)........LIGHT WINDS.
MIXING HEIGHT.......400 FT AGL.
TRANSPORT WINDS.....NORTHWEST 5 TO 6 MPH.
SMOKE DISPERSAL.....POOR (1500 KNOT-FT).
TIME (EDT) 4AM 5AM
SKY (%).........3 6
WEATHER COV.....
WEATHER TYPE....
TSTM COV........
CWR.............0 0
TEMP............35 34
RH..............75 78
20 FT WIND DIR..NW NW
20 FT WIND SPD..1 1
20 FT WIND GUST.6 5
MIX HGT (KFT)...0.4 0.4
TRANSP WIND DIR.NW NW
TRANSP WIND SPD.6 5
VRATE KT-FT/1K..2 2
VENTRATE CAT....PR PR
TODAY
SKY/WEATHER.........SUNNY THEN BECOMING PARTLY SUNNY.
CWR.................0 PERCENT.
MAX TEMPERATURE.....AROUND 57.
MIN HUMIDITY........35 PERCENT.
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.....WEST 3 TO 5 MPH SHIFTING TO THE SOUTHWEST 3 TO
10 MPH EARLY, THEN INCREASING TO 14 TO 21 MPH
EARLY INCREASING TO AROUND 24 MPH LATE IN THE
AFTERNOON.
SMOKE DISPERSAL.....POOR (1000 KNOT-FT) EARLY IN THE MORNING
INCREASING TO GOOD (37200 KNOT-FT) IN THE
AFTERNOON.
TIME (EDT) 6AM 7AM 8AM 9AM 10A 11A 12P 1PM 2PM 3PM 4PM 5PM
SKY (%).........7 3 1 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 0 0 0
TEMP............35 37 43 48 52 55 56 57 57 56 56 54
RH..............75 72 62 51 43 38 37 35 37 40 42 46
20 FT WIND DIR..W W SW SW SW S SW SW SW SW SW SW
20 FT WIND SPD..1 1 1 3 5 7 8 10 12 13 13 13
20 FT WIND GUST.3 3 5 7 9 13 16 20 23 23 24 25
MIX HGT (KFT)...0.4 0.3 0.4 1.0 1.7 2.3 2.3 2.2 1.9 1.7 1.4 1.2
TRANSP WIND DIR.NW W SW SW SW S SW SW SW SW SW SW
TRANSP WIND SPD.5 3 3 7 10 14 17 20 21 24 24 24
VRATE KT-FT/1K..2 1 1 6 16 28 35 37 34 36 30 25
VENTRATE CAT....PR PR PR PR PR PR PR PR PR PR PR PR
TONIGHT
SKY/WEATHER.........MOSTLY CLOUDY.
CWR.................0 PERCENT.
MIN TEMPERATURE.....AROUND 46.
MAX HUMIDITY........93 PERCENT.
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.
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
RH..............52 56 61 65 68 68 74 77 80 80 86 89
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
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
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
SATURDAY
SKY/WEATHER.........PARTLY SUNNY.
CWR.................0 PERCENT.
MAX TEMPERATURE.....AROUND 65.
MIN HUMIDITY........65 PERCENT.
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.
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
RH..............93 89 86 74 72 70 67 65 67 67 65 67
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
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
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
FORECASTER...BELK
REQUESTED BY...MICHAEL MARQUARDT
TYPE OF REQUEST...PRESCRIBED
.TAG 2510789.0/BOX
.DELDT 04/18/25
.FORMATTERVERSION 2.0.0
.EMAIL MICHAEL.MARQUARDT@MASS.GOV
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