744  
FNUS71 KBOX 161039  
FWSBOX  
 
SPOT FORECAST FOR COONAMESSETT...MASS DCR  
NATIONAL WEATHER SERVICE BOSTON/NORTON MA  
639 AM EDT SUN MAR 16 2025  
 
FORECAST IS BASED ON IGNITION TIME OF 0800 EDT ON MARCH 17.  
IF CONDITIONS BECOME UNREPRESENTATIVE, CONTACT THE NATIONAL  
WEATHER SERVICE.  
 
   
DISCUSSION
 
 
INCREASING SOUTHERLY WINDS EXPECTED TODAY WITH GUSTS UP TO 30 MPH  
BY THE NOON HOUR. EXPECT THE LIGHT RAIN/DRIZZLE TO CONTINUE ALL  
DAY AND INTO THE EVENING. FRONTAL SYSTEM WILL BRING MODERATE TO  
HEAVY RAIN STARTING AROUND 2AM MONDAY AND LASTING INTO MONDAY  
EVENING. RAIN WILL BEGIN TO TAPER OFF OVERNIGHT MONDAY INTO  
TUESDAY, HOWEVER, LIGHT RAIN SHOWERS/DRIZZLE COULD CONTINUE INTO  
LATE TUESDAY MORNING. WINDS REMAIN SOUTH MUCH OF MONDAY GUSTING TO  
30MPH, BEFORE DIMINISHING MONDAY EVENING BEFORE TURNING WEST  
BETWEEN 8-11PM  
 
HIGH PRESSURE BUILDS IN ON TUESDAY WITH DRY CONDITIONS AND NORTH  
WINDS AROUND 10-15MPH.  
 
MINRH TODAY AND MONDAY WILL BE AROUND 80-90% DROPPING TO 50-60% ON  
TUESDAY.  
 
   
MONDAY
 
 
SKY/WEATHER.........CLOUDY. PATCHY FOG. RAIN.  
CWR.................100 PERCENT.  
MAX TEMPERATURE.....AROUND 54.  
MIN HUMIDITY........86 PERCENT.  
DEWPOINT............50.  
MAX APPARENT TEMP...54.  
SURFACE WINDS (MPH).SOUTH WINDS 12 TO 20 MPH WITH GUSTS TO AROUND  
32 MPH DECREASING TO AROUND 10 MPH LATE IN THE  
AFTERNOON.  
WIND (20 FT)........SOUTH WINDS 12 TO 20 MPH WITH GUSTS TO AROUND  
32 MPH DECREASING TO AROUND 10 MPH LATE IN THE  
AFTERNOON.  
MIXING HEIGHT.......900 FT AGL.  
TRANSPORT WINDS.....SOUTH 23 TO 31 MPH DECREASING TO 14 TO 21 MPH  
EARLY.  
SMOKE DISPERSAL.....POOR (8100 KNOT-FT) EARLY IN THE MORNING  
INCREASING TO FAIR (20800 KNOT-FT) IN THE  
AFTERNOON.  
LVORI...............5.  
ADI.................26 TO 34 DECREASING TO 15 TO 23 EARLY.  
CEILING (KFT).......0.3.  
 
TIME (EDT) 8AM 9AM 10A 11A 12P 1PM 2PM 3PM 4PM 5PM  
SKY (%).........100 100 100 100 100 100 100 99 99 98  
WEATHER COV.....DEF DEF DEF DEF DEF DEF DEF DEF DEF DEF  
WEATHER TYPE....RN RN RN RN RN RN RN RN RN RN  
TSTM COV........  
CWR.............100 100 100 100 100 100 100 100 100 100  
TEMP............52 53 53 53 53 54 54 54 53 52  
DEWPOINT........52 52 52 51 51 51 51 50 50 49  
RH..............100 96 96 93 93 90 90 86 89 89  
HEAT INDEX (F)..52 53 53 53 53 54 54 54 53 52  
20 FT WIND DIR..S S S S S S S S S S  
20 FT WIND SPD..20 18 18 17 16 16 15 14 12 10  
20 FT WIND GUST.31 32 30 29 28 26 25 23 20 17  
SURFACE WND DIR.S S S S S S S S S S  
SURFACE WND SPD.20 18 18 17 16 16 15 14 12 10  
SURFACE WND GST.31 32 30 29 28 26 25 23 20 17  
MIX HGT (KFT)...0.7 0.9 0.8 0.8 0.7 0.7 0.7 0.7 0.7 0.7  
TRANSP WIND DIR.S S S S S S S S S S  
TRANSP WIND SPD.31 26 23 21 20 17 15 15 15 14  
LVORI...........4 4 4 5 5 4 4 4 4 5  
ADI.............34 32 26 23 21 19 16 16 16 15  
VRATE KT-FT/1K..19 21 17 14 13 11 9 9 9 8  
VENTRATE CAT....PR PR PR PR PR PR PR PR PR PR  
CEILING (KFT)...0.3 0.3 0.3 0.3 0.3 0.3 0.3 0.3 0.3 0.3  
   
MONDAY NIGHT
 
 
SKY/WEATHER.........CLOUDY. RAIN.  
CWR.................100 PERCENT DECREASING TO 80 PERCENT EARLY IN  
THE MORNING.  
MIN TEMPERATURE.....AROUND 37.  
MAX HUMIDITY........96 PERCENT.  
DEWPOINT............46 DECREASING TO 37.  
MIN APPARENT TEMP...33.  
SURFACE WINDS (MPH).SOUTHWEST WINDS 6 TO 9 MPH SHIFTING TO THE WEST  
AROUND 6 MPH LATE IN THE EVENING, THEN SHIFTING  
TO THE NORTH 6 TO 10 MPH WITH GUSTS TO AROUND  
21 MPH AFTER MIDNIGHT.  
WIND (20 FT)........SOUTH WINDS AROUND 9 MPH SHIFTING TO THE  
SOUTHWEST 6 TO 7 MPH IN THE EVENING, THEN  
SHIFTING TO THE NORTH 6 TO 10 MPH WITH GUSTS TO  
AROUND 21 MPH AFTER MIDNIGHT.  
MIXING HEIGHT.......500 FT AGL.  
TRANSPORT WINDS.....SOUTHWEST 10 TO 12 MPH SHIFTING TO THE WEST 8  
TO 12 MPH EARLY, THEN SHIFTING TO THE NORTH 14  
TO 23 MPH AFTER MIDNIGHT.  
SMOKE DISPERSAL.....FAIR (26300 KNOT-FT) EARLY IN THE EVENING  
DECREASING TO POOR (3600 KNOT-FT) LATE IN THE  
NIGHT.  
LVORI...............6.  
ADI.................5 TO 13 INCREASING TO 19 TO 26 AFTER MIDNIGHT.  
CEILING (KFT).......0.3 INCREASING TO 0.8 AFTER MIDNIGHT.  
 
TIME (EDT) 6PM 7PM 8PM 9PM 10P 11P MID 1AM 2AM 3AM 4AM 5AM  
SKY (%).........98 97 97 97 96 96 96 95 95 95 95 95  
WEATHER COV.....DEF DEF LKY DEF DEF DEF DEF LKY LKY LKY LKY CHC  
WEATHER TYPE....RN RN RN RN RN RN RN RN RN RN RN RN  
TSTM COV........  
CWR.............100 100 100 100 100 100 100 100 80 80 80 80  
TEMP............51 49 48 47 46 45 44 43 42 41 41 40  
DEWPOINT........48 48 47 46 44 43 42 41 40 39 38 37  
RH..............89 96 96 96 93 93 93 93 93 92 89 89  
HEAT INDEX (F)..51 46 45 44 43 42 40 38 36 35 35 33  
20 FT WIND DIR..S SW SW W NW N N N N N N N  
20 FT WIND SPD..9 7 6 6 6 6 7 8 9 9 10 10  
20 FT WIND GUST.15 14 12 13 13 14 15 17 18 20 20 21  
SURFACE WND DIR.S SW SW W NW N N N N N N N  
SURFACE WND SPD.9 7 6 6 6 6 7 8 9 9 10 10  
SURFACE WND GST.15 14 12 13 13 14 15 17 18 20 20 21  
MIX HGT (KFT)...0.6 0.6 0.5 0.7 0.9 1.1 1.2 1.2 1.2 1.3 1.3 1.3  
TRANSP WIND DIR.SW W W NW N N N N N N N N  
TRANSP WIND SPD.12 10 8 12 14 17 20 21 23 23 23 23  
LVORI...........5 6 7 6 6 5 5 5 5 5 4 4  
ADI.............10 7 5 8 9 12 13 19 21 21 21 26  
VRATE KT-FT/1K..6 5 4 7 11 17 20 22 25 25 26 26  
VENTRATE CAT....PR PR PR PR PR PR PR PR PR PR PR PR  
CEILING (KFT)...0.3 0.3 0.3 0.3 0.8 0.8 0.8 0.8 0.8 0.8 0.8 0.8  
   
TUESDAY
 
 
SKY/WEATHER.........MOSTLY CLOUDY. CHANCE OF RAIN IN THE MORNING,  
THEN SLIGHT CHANCE OF RAIN EARLY.  
CWR.................80 PERCENT DECREASING TO 0 PERCENT.  
MAX TEMPERATURE.....AROUND 46.  
MIN HUMIDITY........65 PERCENT.  
DEWPOINT............35.  
MIN APPARENT TEMP...32.  
SURFACE WINDS (MPH).NORTH WINDS 9 TO 12 MPH.  
WIND (20 FT)........NORTH WINDS 9 TO 12 MPH.  
MIXING HEIGHT.......1700 FT AGL.  
TRANSPORT WINDS.....NORTH 22 TO 26 MPH.  
SMOKE DISPERSAL.....FAIR (25000 KNOT-FT) EARLY IN THE MORNING  
INCREASING TO GOOD (39000 KNOT-FT) IN THE  
AFTERNOON.  
LVORI...............3.  
ADI.................26 TO 33 INCREASING TO 37 TO 46 IN THE LATE  
MORNING AND AFTERNOON.  
CEILING (KFT).......0.8 INCREASING TO 1.5.  
 
TIME (EDT) 6AM 7AM 8AM 9AM 10A 11A 12P 1PM 2PM 3PM 4PM 5PM  
SKY (%).........92 90 88 84 80 76 72 68 64 61 58 55  
WEATHER COV.....CHC CHC CHC CHC CHC SCH SCH SCH SCH  
WEATHER TYPE....RN RN RN RN RN RN RN RN RN  
TSTM COV........  
CWR.............80 80 20 20 20 20 20 20 0 0 0 0  
TEMP............39 39 39 40 42 44 45 46 46 46 46 45  
DEWPOINT........36 36 35 35 36 36 35 35 35 35 35 34  
RH..............89 89 85 82 79 73 68 65 65 65 65 65  
HEAT INDEX (F)..32 32 32 33 36 38 39 41 41 41 41 40  
20 FT WIND DIR..N N N N N N N N N N N N  
20 FT WIND SPD..10 12 12 12 12 12 12 12 12 10 10 9  
20 FT WIND GUST.21 22 22 22 21 21 21 20 20 18 17 16  
SURFACE WND DIR.N N N N N N N N N N N N  
SURFACE WND SPD.10 12 12 12 12 12 12 12 12 10 10 9  
SURFACE WND GST.21 22 22 22 21 21 21 20 20 18 17 16  
MIX HGT (KFT)...1.3 1.3 1.3 1.4 1.6 1.7 1.7 1.6 1.6 1.5 1.5 1.5  
TRANSP WIND DIR.N N N N N N N N N N N N  
TRANSP WIND SPD.23 22 22 23 25 26 26 26 26 25 24 23  
LVORI...........4 4 4 3 3 3 1 1 1 1 3 3  
ADI.............26 33 33 37 43 46 46 45 45 42 39 37  
VRATE KT-FT/1K..26 25 25 29 35 39 38 37 36 34 31 29  
VENTRATE CAT....PR PR PR PR PR PR PR PR PR PR PR PR  
CEILING (KFT)...0.8 0.8 0.8 0.8 1.0 1.0 1.0 1.5 1.5 1.5 1.5 1.5  
 

 
FORECASTER...KP  
REQUESTED BY...JOSH NIGRO  
TYPE OF REQUEST...PRESCRIBED  
.TAG 2506598.0/BOX  
.DELDT 03/16/25  
.FORMATTERVERSION 2.0.0  
.EMAIL JOSH.NIGRO@MASS.GOV  
 
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