021
FNUS71 KBOX 041426
FWSBOX
SPOT FORECAST FOR BOSTON 4TH (DFS)...DEPARTMENT OF FIRE SERVICES
NATIONAL WEATHER SERVICE BOSTON/NORTON MA
1026 AM EDT SAT JUL 4 2026
FORECAST IS BASED ON FORECAST START TIME OF 1000 EDT ON JULY 04.
IF CONDITIONS BECOME UNREPRESENTATIVE, CONTACT THE NATIONAL
WEATHER SERVICE.
..HEAT ADVISORY IN EFFECT UNTIL 8 PM EDT THIS EVENING
DISCUSSION
DANGEROUS HEAT AND HUMIDITY CONTINUE TODAY, WITH THIS AFTERNOON'S
HIGH TEMPERATURE AND HEAT INDEX BOTH HOVERING IN THE MID-TO-UPPER
90S. FORECAST SHOULD BE DRY FOR THE MAJORITY OF THE DAY, BUT
SCATTERED SHOWERS AND THUNDERSTORMS WILL THREATEN LATER THIS
AFTERNOON AND THIS EVENING. THERE APPEAR TO BE TWO TIMELINES OF
POTENTIAL STORMS, BETWEEN 1-5 PM AND 8-11 PM.
REST OF TODAY
SKY/WEATHER.........MOSTLY SUNNY. CHANCE OF SHOWERS AND
THUNDERSTORMS IN THE AFTERNOON.
CHANCE OF PCPN......30 PERCENT.
CHANCE OF PCPN......30 PERCENT.
CHANCE OF PCPN......30 PERCENT.
CHANCE OF RAIN......20 PERCENT.
CHANCE OF THUNDER...26 PERCENT.
BEGIN/END OF PCPN...
MAX TEMPERATURE.....AROUND 96.
MIN HUMIDITY........40 PERCENT.
MAX APPARENT TEMP...97.
MAX APPARENT TEMP...97.
MAX APPARENT TEMP...97.
EYE LEVEL WINDS.....WEST WINDS 5 TO 7 MPH.
SURFACE WINDS (MPH).WEST WINDS 9 TO 12 MPH.
WIND (20 FT)........WEST WINDS 9 TO 12 MPH. GUSTY AND ERRATIC WINDS
EXPECTED NEAR THUNDERSTORMS LATE IN THE
AFTERNOON.
100 FT WIND.........
WAVE HEIGHT.........LESS THAN 1 FOOT.
RAINFALL AMOUNT.....0.04 INCHES.
PCPN AMOUNT.........0.04 INCHES.
SNOWFALL AMOUNT.....0.0 INCHES.
CEILING (KFT).......10 DECREASING TO 6.0.
VISIBILITY..........10.
WATER TEMPERATURE...
MIXING HEIGHT.......4000 FT AGL.
TRANSPORT WINDS.....NORTHWEST 14 TO 16 MPH.
SMOKE DISPERSAL.....FAIR (13700 KNOT-FT) EARLY IN THE MORNING
INCREASING TO GOOD (56700 KNOT-FT) IN THE
AFTERNOON.
LVORI...............2.
ADI.................19 EARLY IN THE MORNING INCREASING TO 73 IN THE
AFTERNOON.
TIME (EDT) 10A 11A 12P 1PM 2PM 3PM 4PM 5PM
SKY (%).........28 31 47 51 56 62 62 68
WEATHER COV..... SCH CHC CHC CHC CHC
WEATHER TYPE.... RW RW RW RW RW
TSTM COV........ CHC CHC CHC SCH
CHC OF PCPN (%).10 10 10 20 30 30 30 30
CHC OF RAIN (%).0 0 20 20 20 20 20 20
CHC OF THDR (%).0 0 0 0 30 30 30 20
TEMP............88 91 92 94 94 94 93 91
RH..............50 44 43 40 40 40 41 44
HEAT INDEX (F)..91 94 95 97 97 97 96 94
WIND CHILL (F)..91 94 95 97 97 97 96 94
APARNT TMP (F)..91 94 95 97 97 97 96 94
20 FT WIND DIR..W W W W W W W W
20 FT WIND SPD..9 9 10 10 12 12 12 12
20 FT WIND GUST.16 18 20 21 22 20 18 17
EYE LVL WND DIR.W W W W W W W W
EYE LVL WND SPD.5 5 6 6 7 7 7 7
EYE LVL WND GST.10 11 12 13 13 12 11 10
SURFACE WND DIR.W W W W W W W W
SURFACE WND SPD.9 9 10 10 12 12 12 12
SURFACE WND GST.16 18 20 21 22 20 18 17
MIX HGT (KFT)...2.8 2.9 3.8 4.0 3.3 3.2 2.0 1.1
TRANSP WIND DIR.NW NW NW NW NW W NW NW
TRANSP WIND SPD.14 14 16 16 16 15 15 14
100 FT WIND.....
LVORI...........1 1 1 1 1 1 2 2
ADI.............49 49 73 60 54 37 28 19
VRATE KT-FT/1K..34 35 53 57 46 41 26 14
VENTRATE CAT....PR PR FR FR FR FR PR PR
WAVE HEIGHT (FT)0 0 0 0 0 0 0 0
CEILING (KFT)...12 11 10 8.0 7.0 6.0 6.0 6.0
VISIBILITY (SM).10 10 10 10 10 10 10 10
WATER TEMP......
TONIGHT
SKY/WEATHER.........MOSTLY CLOUDY. SLIGHT CHANCE OF THUNDERSTORMS
EARLY IN THE EVENING. CHANCE OF SHOWERS EARLY
IN THE EVENING, THEN SLIGHT CHANCE OF SHOWERS
IN THE EVENING.
CHANCE OF PCPN......30 PERCENT.
CHANCE OF PCPN......30 PERCENT.
CHANCE OF PCPN......30 PERCENT.
CHANCE OF RAIN......22 PERCENT.
CHANCE OF THUNDER...21 PERCENT.
BEGIN/END OF PCPN...
MIN TEMPERATURE.....AROUND 70.
MAX HUMIDITY........71 PERCENT.
MAX APPARENT TEMP...92.
MAX APPARENT TEMP...92.
MAX APPARENT TEMP...92.
EYE LEVEL WINDS.....NORTHWEST WINDS UP TO 6 MPH.
SURFACE WINDS (MPH).NORTHWEST WINDS 6 TO 10 MPH.
WIND (20 FT)........NORTHWEST WINDS 6 TO 10 MPH. GUSTY AND ERRATIC
WINDS EXPECTED NEAR THUNDERSTORMS EARLY IN THE
EVENING.
100 FT WIND.........
WAVE HEIGHT.........LESS THAN 1 FOOT.
RAINFALL AMOUNT.....0.04 INCHES.
PCPN AMOUNT.........0.04 INCHES.
SNOWFALL AMOUNT.....0.0 INCHES.
CEILING (KFT).......6.0 INCREASING TO 10.
VISIBILITY..........9.
WATER TEMPERATURE...
MIXING HEIGHT.......500 FT AGL.
TRANSPORT WINDS.....NORTH 7 TO 12 MPH.
SMOKE DISPERSAL.....POOR (2700 KNOT-FT).
LVORI...............3.
ADI.................5 TO 10.
TIME (EDT) 6PM 7PM 8PM 9PM 10P 11P MID 1AM 2AM 3AM 4AM 5AM
SKY (%).........65 65 72 70 65 61 61 61 62 59 56 53
WEATHER COV.....CHC SCH SCH SCH
WEATHER TYPE....RW RW RW RW
TSTM COV........SCH SCH
CHC OF PCPN (%).30 20 20 20 10 10 10 10 10 10 10 10
CHC OF RAIN (%).20 20 20 20 20 20 20 20 10 20 20 20
CHC OF THDR (%).20 20 10 10 10 0 0 0 0 0 0 0
TEMP............89 87 84 82 81 79 77 76 75 73 72 71
RH..............47 50 55 56 58 60 62 62 66 68 71 71
HEAT INDEX (F)..92 89 86 84 83 79 77 76 75 73 72 71
WIND CHILL (F)..92 89 86 84 83 79 77 76 75 73 72 71
APARNT TMP (F)..92 89 86 84 83 79 77 76 75 73 72 71
20 FT WIND DIR..NW NW NW NW NW NW NW NW NW NW NW NW
20 FT WIND SPD..10 8 7 7 8 8 8 8 7 7 7 6
20 FT WIND GUST.15 13 10 9 9 9 9 9 9 8 8 8
EYE LVL WND DIR.NW NW NW NW NW NW NW NW NW NW NW NW
EYE LVL WND SPD.6 5 4 4 5 5 5 5 4 4 4 4
EYE LVL WND GST.9 8 6 5 5 5 5 5
SURFACE WND DIR.NW NW NW NW NW NW NW NW NW NW NW NW
SURFACE WND SPD.10 8 7 7 8 8 8 8 7 7 7 6
SURFACE WND GST.15 13 10 9 9 9 9 9 9 8 8 8
MIX HGT (KFT)...0.6 0.5 0.5 0.5 0.5 0.5 0.5 0.5 0.5 0.5 0.5 0.5
TRANSP WIND DIR.NW NW N N N N N N N N N N
TRANSP WIND SPD.12 12 10 10 10 12 12 10 10 8 7 7
100 FT WIND.....
LVORI...........2 2 3 3 2 3 3 3 3 3 3 3
ADI.............9 9 7 7 9 10 10 9 7 5 5 7
VRATE KT-FT/1K..6 6 4 4 4 5 5 4 4 3 3 3
VENTRATE CAT....PR PR PR PR PR PR PR PR PR PR PR PR
WAVE HEIGHT (FT)0 0 0 0 0 0 0 0 0 0 0 0
CEILING (KFT)...6.0 6.0 6.0 6.0 6.0 6.0 6.0 6.0 6.0 7.0 9.0 10
VISIBILITY (SM).10 10 10 10 10 10 10 10 10 10 10 9
WATER TEMP......
FORECASTER...BOATMAN
REQUESTED BY...ERICK BENOIT
TYPE OF REQUEST...OTHER
.TAG 2616744.0/BOX
.DELDT 07/04/26
.FORMATTERVERSION 2.0.0
.EMAIL ERICK.BENOIT@MASS.GOV
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