911
FNUS71 KBOX 180520
FWSBOX
SPOT FORECAST FOR QUABBIN SPILLWAY RX...DCR MASSACHUSETTS
NATIONAL WEATHER SERVICE BOSTON/NORTON MA
120 AM EDT FRI APR 18 2025
FORECAST IS BASED ON IGNITION TIME OF 0900 EDT ON APRIL 18.
IF CONDITIONS BECOME UNREPRESENTATIVE, CONTACT THE NATIONAL
WEATHER SERVICE.
DISCUSSION
DRY AND BREEZY CONDITIONS TODAY. BREEZY S/SW WINDS WITH GUSTS UP
TO 26 MPH. RELATIVE HUMIDITY VALUES DROP INTO THE 25-30 PERCENT
RANGE FOR THE AFTERNOON. SMOKE DISPERSAL IMPROVES THROUGH THE
MORNING BECOMING GOOD TO EXCELLENT IN THE AFTERNOON.
SCATTERED SHOWERS POSSIBLE TONIGHT WITH LITTLE TO NO CHANCE FOR
WETTING RAIN. RELATIVE HUMIDITY VALUES RECOVER INTO THE 80
PERCENT RANGE.
REST OF TODAY
SKY/WEATHER.........SUNNY THEN BECOMING PARTLY SUNNY.
CWR.................0 PERCENT.
MAX TEMPERATURE.....AROUND 65.
MIN HUMIDITY........27 PERCENT.
DEWPOINT............27 INCREASING TO 30 LATE IN THE AFTERNOON.
SURFACE WINDS (MPH).LIGHT WINDS BECOMING SOUTH AROUND 15 MPH WITH
GUSTS TO AROUND 26 MPH.
WIND (20 FT)........LIGHT WINDS BECOMING SOUTH AROUND 15 MPH WITH
GUSTS TO AROUND 26 MPH.
MIXING HEIGHT.......4300 FT AGL.
TRANSPORT WINDS.....SOUTHWEST 7 TO 15 MPH INCREASING TO 18 TO 26
MPH IN THE AFTERNOON.
SMOKE DISPERSAL.....POOR (7400 KNOT-FT) EARLY IN THE MORNING
INCREASING TO EXCELLENT (89900 KNOT-FT) IN THE
AFTERNOON.
LVORI...............2.
ADI.................11 INCREASING TO 27, THEN INCREASING TO 54 TO
63 EARLY INCREASING TO 77 EARLY IN THE
AFTERNOON DECREASING TO 64 TO 69.
CEILING (KFT).......25 DECREASING TO 15.
TIME (EDT) 9AM 10A 11A 12P 1PM 2PM 3PM 4PM 5PM
SKY (%).........5 9 17 23 17 29 54 71 83
WEATHER COV.....
WEATHER TYPE....
TSTM COV........
CWR.............0 0 0 0 0 0 0 0 0
TEMP............46 51 56 59 61 64 64 64 62
DEWPOINT........25 25 25 26 27 29 29 30 31
RH..............43 36 30 28 27 27 27 28 31
20 FT WIND DIR..SW S SW SW SW SW S S S
20 FT WIND SPD..2 5 7 10 12 14 14 15 15
20 FT WIND GUST.7 12 15 18 21 23 24 25 26
SURFACE WND DIR.SW S SW SW SW SW S S S
SURFACE WND SPD.2 5 7 10 12 14 14 15 15
SURFACE WND GST.7 12 15 18 21 23 24 25 26
MIX HGT (KFT)...1.2 2.1 2.9 3.4 4.0 4.3 4.3 3.7 3.1
TRANSP WIND DIR.SW SW SW SW SW SW SW SW SW
TRANSP WIND SPD.7 10 15 18 21 23 24 25 26
LVORI...........2 2 1 1 1 1 1 1 1
ADI.............11 27 54 63 77 66 69 68 64
VRATE KT-FT/1K..7 19 38 55 71 86 90 82 71
VENTRATE CAT....PR PR PR FR GD GD GD GD GD
CEILING (KFT)...25 25 25 25 25 25 20 15 15
TONIGHT
SKY/WEATHER.........MOSTLY CLOUDY. SLIGHT CHANCE OF RAIN SHOWERS
EARLY IN THE EVENING.
CWR.................0 PERCENT.
MIN TEMPERATURE.....AROUND 49.
MAX HUMIDITY........86 PERCENT.
DEWPOINT............32 INCREASING TO 46.
SURFACE WINDS (MPH).SOUTHWEST WINDS 12 TO 15 MPH WITH GUSTS TO
AROUND 28 MPH.
WIND (20 FT)........SOUTHWEST WINDS 12 TO 15 MPH WITH GUSTS TO
AROUND 28 MPH.
MIXING HEIGHT.......700 FT AGL.
TRANSPORT WINDS.....SOUTHWEST 16 TO 24 MPH.
SMOKE DISPERSAL.....GOOD (47600 KNOT-FT) EARLY IN THE EVENING
DECREASING TO POOR (9600 KNOT-FT) LATE IN THE
NIGHT.
LVORI...............3.
ADI.................50 DECREASING TO 14 TO 19.
CEILING (KFT).......11 DECREASING TO 8.0.
TIME (EDT) 6PM 7PM 8PM 9PM 10P 11P MID 1AM 2AM 3AM 4AM 5AM
SKY (%).........84 80 79 74 68 72 74 77 80 77 74 72
WEATHER COV..... SCH
WEATHER TYPE.... RW
TSTM COV........
CWR.............0 0 0 0 0 0 0 0 0 0 0 0
TEMP............60 58 54 52 51 50 51 50 50 51 51 51
DEWPOINT........31 32 33 34 36 37 39 41 43 44 46 46
RH..............33 37 45 50 56 61 63 71 77 77 83 83
20 FT WIND DIR..S S S S SW SW SW SW SW SW SW SW
20 FT WIND SPD..15 14 14 14 14 13 13 13 12 12 12 12
20 FT WIND GUST.26 28 28 26 28 28 26 25 25 25 24 25
SURFACE WND DIR.S S S S SW SW SW SW SW SW SW SW
SURFACE WND SPD.15 14 14 14 14 13 13 13 12 12 12 12
SURFACE WND GST.26 28 28 26 28 28 26 25 25 25 24 25
MIX HGT (KFT)...2.3 1.2 0.9 0.9 0.8 0.8 0.8 0.8 0.7 0.8 0.7 0.7
TRANSP WIND DIR.SW SW SW SW SW SW SW SW SW SW SW SW
TRANSP WIND SPD.24 21 20 21 18 17 18 17 16 17 17 16
LVORI...........1 2 2 2 2 2 2 3 4 4 4 4
ADI.............50 19 18 19 16 15 16 15 14 15 15 14
VRATE KT-FT/1K..48 22 15 17 13 12 13 12 10 12 11 10
VENTRATE CAT....FR PR PR PR PR PR PR PR PR PR PR PR
CEILING (KFT)...13 13 12 11 10 10 11 11 11 11 12 8.0
SATURDAY
SKY/WEATHER.........MOSTLY CLOUDY. SLIGHT CHANCE OF RAIN SHOWERS
LATE IN THE AFTERNOON.
CWR.................0 PERCENT.
MAX TEMPERATURE.....AROUND 80.
MIN HUMIDITY........47 PERCENT.
DEWPOINT............50 INCREASING TO 54 EARLY.
SURFACE WINDS (MPH).SOUTHWEST WINDS 12 TO 16 MPH WITH GUSTS TO
AROUND 28 MPH.
WIND (20 FT)........SOUTHWEST WINDS 12 TO 16 MPH WITH GUSTS TO
AROUND 28 MPH.
MIXING HEIGHT.......4400 FT AGL.
TRANSPORT WINDS.....SOUTHWEST 16 TO 25 MPH SHIFTING TO THE WEST 26
TO 28 MPH LATE IN THE AFTERNOON.
SMOKE DISPERSAL.....POOR (10400 KNOT-FT) EARLY IN THE MORNING
INCREASING TO EXCELLENT (100600 KNOT-FT) IN THE
AFTERNOON.
LVORI...............3.
ADI.................18 TO 24 INCREASING TO 68 TO 76.
CEILING (KFT).......7.0 INCREASING TO 9.0 EARLY IN THE MORNING,
THEN DECREASING TO 8.0 EARLY INCREASING TO 11
LATE IN THE MORNING DECREASING TO 5.0
DECREASING TO 4.0 EARLY INCREASING TO 5.0
INCREASING TO 7.0 EARLY IN THE AFTERNOON
INCREASING TO 8.0 DECREASING TO 6.0 LATE IN THE
AFTERNOON DECREASING TO 5.0.
TIME (EDT) 6 AM 8 AM 10 AM NOON 2 PM 4 PM
SKY (%).........70 67 75 74 66 71
WEATHER COV..... S CHC
WEATHER TYPE....NONE NONE NONE NONE NONE RNSHWR
TSTM COV........
CWR.............0 0 0 0 0 0
TEMP............52 55 64 70 77 78
DEWPOINT........48 50 52 54 55 56
RH..............86 83 65 57 47 47
20 FT WIND......SW 12 SW 13 SW 14 SW 15 SW 16 SW 15
20 FT WIND GUST.25 24 26 26 28 26
SURFACE WIND....SW 12 SW 13 SW 14 SW 15 SW 16 SW 15
SURFACE WND GST.25 24 26 26 28 26
MIX HGT (FT)....700 1000 2100 3100 4400 3900
TRANSPORT WIND..SW 16 SW 20 SW 23 SW 25 W 26 W 28
LVORI...........4 4 1 1 1 1
ADI.............18 24 45 61 76 75
VRATE KT-FT/1K..10 16 41 68 101 93
VENTRATE CAT....POOR POOR FAIR GOOD VYGD GOOD
CEILING (KFT)...7.0 8.0 5.0 5.0 8.0 6.0
FORECASTER...MENSCH
REQUESTED BY...ALEX BELOTE
TYPE OF REQUEST...PRESCRIBED
.TAG 2510950.0/BOX
.DELDT 04/18/25
.FORMATTERVERSION 2.0.0
.EMAIL ALEX.BELOTE@MASS.GOV
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