429
FNUS71 KBOX 010755
FWSBOX
SPOT FORECAST FOR QUABBIN SPILLWAY RX...DEPT. OF CONSERVATION AND RECREATION
NATIONAL WEATHER SERVICE BOSTON/NORTON MA
355 AM EDT THU MAY 1 2025
FORECAST IS BASED ON IGNITION TIME OF 0900 EDT ON MAY 01.
IF CONDITIONS BECOME UNREPRESENTATIVE, CONTACT THE NATIONAL
WEATHER SERVICE.
DISCUSSION
PLENTY OF SUNSHINE IS ON TAP FOR TODAY...BUT WE DO EXPECT SOME MID
AND HIGH LEVEL CLOUDS TOO. HIGHS WILL BE AROUND 70 AND WITH A
VERY DRY AIRMASS IN PLACE...EXPECT MINIMUM AFTERNOON RELATIVE
HUMIDITY VALUES TO DROP TO BETWEEN 15 AND 25 PERCENT. WINDS WILL
BECOME SOUTH SOUTHWEST THIS MORNING AND ON THE ORDER OF 5 TO 15
MPH DURING THE AFTERNOON. DRY WEATHER WILL PREVAIL FOR MOST OF
THE EVENING...BUT EXPECT RELATIVE HUMIDITY VALUES TO RECOVER GIVEN
INCREASING LOW LEVEL MOISTURE.
TODAY
SKY/WEATHER.........MOSTLY SUNNY.
CWR.................0 PERCENT.
MAX TEMPERATURE.....AROUND 70.
MIN HUMIDITY........22 PERCENT.
DEWPOINT............29.
MAX APPARENT TEMP...70.
SURFACE WINDS (MPH).LIGHT WINDS BECOMING SOUTH 5 TO 9 MPH IN THE
AFTERNOON.
WIND (20 FT)........SOUTH WINDS 5 TO 9 MPH LATE IN THE MORNING
BECOMING LIGHT, THEN BECOMING SOUTH 5 TO 9 MPH
IN THE AFTERNOON.
MIXING HEIGHT.......3600 FT AGL.
TRANSPORT WINDS.....SOUTHEAST 5 TO 6 MPH SHIFTING TO THE SOUTHWEST
5 TO 10 MPH EARLY.
SMOKE DISPERSAL.....POOR (9700 KNOT-FT) EARLY IN THE MORNING
INCREASING TO FAIR (29700 KNOT-FT) IN THE
AFTERNOON.
LVORI...............2.
ADI.................14 TO 23 INCREASING TO 42.
CEILING (KFT).......10 DECREASING TO 9.0 EARLY IN THE AFTERNOON,
THEN INCREASING TO 10 LATE IN THE AFTERNOON
INCREASING TO 13 LATE IN THE AFTERNOON.
TIME (EDT) 9AM 10A 11A 12P 1PM 2PM 3PM 4PM 5PM
SKY (%).........44 42 44 33 44 35 38 37 35
WEATHER COV.....
WEATHER TYPE....
TSTM COV........
CWR.............0 0 0 0 0 0 0 0 0
TEMP............49 54 58 61 63 66 68 70 70
DEWPOINT........28 29 29 29 28 28 29 29 30
RH..............44 38 33 29 26 24 23 22 22
HEAT INDEX (F)..49 54 58 61 63 66 68 70 70
20 FT WIND DIR..E SE S S S SW S S S
20 FT WIND SPD..2 3 3 5 6 7 8 9 9
20 FT WIND GUST.8 9 10 10 12 13 14 13 14
SURFACE WND DIR.E SE S S S SW S S S
SURFACE WND SPD.2 3 3 5 6 7 8 9 9
SURFACE WND GST.8 9 10 10 12 13 14 13 14
MIX HGT (KFT)...1.9 2.4 2.9 3.2 3.4 3.6 3.5 3.4 3.3
TRANSP WIND DIR.SE S S S SW SW SW S S
TRANSP WIND SPD.6 5 5 6 7 8 9 9 10
LVORI...........2 2 2 2 2 1 1 1 1
ADI.............14 15 17 23 30 35 39 38 42
VRATE KT-FT/1K..10 10 12 16 20 25 28 27 30
VENTRATE CAT....PR PR PR PR PR PR PR PR PR
CEILING (KFT)...12 11 10 9.0 9.0 9.0 10 11 13
TONIGHT
SKY/WEATHER.........PARTLY CLOUDY THEN BECOMING MOSTLY CLOUDY.
SCATTERED RAIN SHOWERS AFTER MIDNIGHT. RAIN
SHOWERS LIKELY EARLY IN THE MORNING.
CWR.................0 PERCENT INCREASING TO 86 PERCENT EARLY IN THE
MORNING.
MIN TEMPERATURE.....AROUND 48.
MAX HUMIDITY........96 PERCENT.
DEWPOINT............33 INCREASING TO 44.
MAX APPARENT TEMP...67.
SURFACE WINDS (MPH).SOUTH WINDS 5 TO 9 MPH.
WIND (20 FT)........SOUTH WINDS 5 TO 9 MPH.
MIXING HEIGHT.......400 FT AGL.
TRANSPORT WINDS.....SOUTH 7 TO 14 MPH.
SMOKE DISPERSAL.....FAIR (22700 KNOT-FT) EARLY IN THE EVENING
DECREASING TO POOR (2300 KNOT-FT) LATE IN THE
NIGHT.
LVORI...............3.
ADI.................26 TO 33 DECREASING TO 5 TO 10 UNTIL JUST AFTER
MIDNIGHT.
CEILING (KFT).......11 DECREASING TO 1.5.
TIME (EDT) 6PM 7PM 8PM 9PM 10P 11P MID 1AM 2AM 3AM 4AM 5AM
SKY (%).........37 50 62 73 76 86 88 90 93 93 93 93
WEATHER COV..... SCT SCT SCT SCT LKY
WEATHER TYPE.... RW RW RW RW RW
TSTM COV........
CWR.............0 0 0 0 0 0 0 0 90 90 90 90
TEMP............67 63 58 55 53 51 50 50 50 50 50 50
DEWPOINT........31 33 34 35 35 35 37 38 40 42 44 46
RH..............26 32 40 47 50 54 61 63 68 74 80 86
HEAT INDEX (F)..67 63 58 55 53 51 48 48 48 48 47 47
20 FT WIND DIR..S S S S S S S S S S S SE
20 FT WIND SPD..9 9 8 7 6 5 6 6 6 6 7 7
20 FT WIND GUST.13 13 12 12 12 12 12 13 13 14 15 14
SURFACE WND DIR.S S S S S S S S S S S SE
SURFACE WND SPD.9 9 8 7 6 5 6 6 6 6 7 7
SURFACE WND GST.13 13 12 12 12 12 12 13 13 14 15 14
MIX HGT (KFT)...2.5 1.7 1.0 0.8 0.7 0.5 0.5 0.4 0.4 0.4 0.4 0.4
TRANSP WIND DIR.S S S S S S S S S S S S
TRANSP WIND SPD.10 12 12 12 10 10 9 8 7 9 12 14
LVORI...........1 2 2 2 2 2 3 3 3 3 4 5
ADI.............33 26 10 8 7 7 6 5 5 6 8 9
VRATE KT-FT/1K..23 18 10 8 6 5 4 3 2 3 4 5
VENTRATE CAT....PR PR PR PR PR PR PR PR PR PR PR PR
CEILING (KFT)...11 9.0 8.0 7.0 6.0 4.5 4.5 4.5 4.5 3.5 2.5 1.5
FORECASTER...FRANK
REQUESTED BY...ALEX BELOTE
TYPE OF REQUEST...PRESCRIBED
.TAG 2512453.0/BOX
.DELDT 05/01/25
.FORMATTERVERSION 2.0.0
.EMAIL ALEX.BELOTE@MASS.GOV
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