130
FNUS71 KBOX 120747
FWSBOX
SPOT FORECAST FOR GREAT SWAMP RX...RI DEM
NATIONAL WEATHER SERVICE BOSTON/NORTON MA
347 AM EDT WED MAR 12 2025
FORECAST IS BASED ON IGNITION TIME OF 0700 EDT ON MARCH 12.
IF CONDITIONS BECOME UNREPRESENTATIVE, CONTACT THE NATIONAL
WEATHER SERVICE.
DISCUSSION
NORTHERLY WINDS PREVAIL OVER SOUTHERN RHODE ISLAND TODAY,
SUSTAINED UP TO 10 MPH AND GUSTING TO 25 MPH EARLY BEFORE
DIMINISHING AROUND NOON. WINDS SHIFT MORE TO THE NORTHEAST, THEN
TO THE EAST IN THE LATE AFTERNOON HOURS: AROUND 4 PM. WINDS
OVERNIGHT STAY LIGHT AND EASTERLY AT AROUND 5 MPH.
MINIMUM RELATIVE HUMIDITY VALUES TODAY WILL RANGE FROM 25 TO 30
PERCENT. TOMORROW, THEY ARE EXPECTED TO INCREASE TO 60 PERCENT
DURING THE DAY.
REST OF TODAY
SKY/WEATHER.........PARTLY SUNNY THEN BECOMING MOSTLY SUNNY.
CWR.................0 PERCENT.
MAX TEMPERATURE.....AROUND 48.
MIN HUMIDITY........28 PERCENT.
DEWPOINT............25 DECREASING TO 17.
MIN APPARENT TEMP...32.
SURFACE WINDS (MPH).NORTHEAST WINDS 6 TO 9 MPH WITH GUSTS TO AROUND
23 MPH SHIFTING TO THE EAST 6 TO 7 MPH LATE IN
THE AFTERNOON.
WIND (20 FT)........NORTH WINDS AROUND 6 MPH WITH GUSTS TO AROUND
21 MPH SHIFTING TO THE EAST 6 TO 7 MPH LATE IN
THE AFTERNOON.
MIXING HEIGHT.......3300 FT AGL.
TRANSPORT WINDS.....NORTH 12 TO 20 MPH SHIFTING TO THE NORTHEAST
AROUND 9 MPH LATE IN THE AFTERNOON.
SMOKE DISPERSAL.....POOR (9400 KNOT-FT) EARLY IN THE MORNING
INCREASING TO GOOD (35900 KNOT-FT) IN THE
AFTERNOON.
LVORI...............2.
ADI.................16 INCREASING TO 29 EARLY, THEN INCREASING TO
46 TO 52 IN THE LATE MORNING AND EARLY
AFTERNOON DECREASING TO 33 TO 38 LATE IN THE
AFTERNOON DECREASING TO 25.
CEILING (KFT).......25 DECREASING TO 20 EARLY, THEN DECREASING TO
15 EARLY INCREASING TO 20 EARLY IN THE
AFTERNOON DECREASING TO 14 DECREASING TO 10
LATE IN THE AFTERNOON DECREASING TO 9.0.
TIME (EDT) 7AM 8AM 9AM 10A 11A 12P 1PM 2PM 3PM 4PM 5PM
SKY (%).........56 56 50 20 23 23 27 20 28 41 64
WEATHER COV.....
WEATHER TYPE....
TSTM COV........
CWR.............0 0 0 0 0 0 0 0 0 0 0
TEMP............37 37 40 42 43 45 46 47 47 46 44
DEWPOINT........27 24 21 19 16 16 16 16 17 18 18
RH..............67 59 46 39 33 31 29 28 30 32 35
HEAT INDEX (F)..32 32 34 37 38 41 42 44 44 43 41
20 FT WIND DIR..N N N N N NE NE NE E E E
20 FT WIND SPD..6 7 9 8 9 8 7 7 7 6 6
20 FT WIND GUST.21 22 23 22 18 15 13 12 12 10 12
SURFACE WND DIR.N N N N N NE NE NE E E E
SURFACE WND SPD.6 7 9 8 9 8 7 7 7 6 6
SURFACE WND GST.21 22 23 22 18 15 13 12 12 10 12
MIX HGT (KFT)...0.7 1.2 1.9 2.0 2.4 2.8 3.1 3.3 3.3 2.9 2.2
TRANSP WIND DIR.N N N N N N NE NE NE E E
TRANSP WIND SPD.15 18 20 18 17 15 12 9 9 9 9
LVORI...........3 2 1 1 1 1 1 1 1 1 2
ADI.............16 29 48 47 47 52 46 37 38 33 25
VRATE KT-FT/1K..9 19 34 32 35 36 32 26 27 23 18
VENTRATE CAT....PR PR PR PR PR PR PR PR PR PR PR
CEILING (KFT)...25 20 20 20 15 20 20 15 14 10 9.0
TONIGHT
SKY/WEATHER.........MOSTLY CLOUDY.
CWR.................0 PERCENT.
MIN TEMPERATURE.....AROUND 31.
MAX HUMIDITY........85 PERCENT.
DEWPOINT............21 INCREASING TO 26 IN THE LATE EVENING AND
OVERNIGHT.
MIN APPARENT TEMP...29.
SURFACE WINDS (MPH).EAST WINDS 5 TO 6 MPH IN THE EVENING BECOMING
LIGHT, THEN BECOMING EAST AROUND 5 MPH EARLY IN
THE MORNING.
WIND (20 FT)........EAST WINDS 5 TO 6 MPH IN THE EVENING BECOMING
LIGHT, THEN BECOMING EAST AROUND 5 MPH EARLY IN
THE MORNING.
MIXING HEIGHT.......900 FT AGL.
TRANSPORT WINDS.....EAST 10 TO 13 MPH.
SMOKE DISPERSAL.....FAIR (19300 KNOT-FT) EARLY IN THE EVENING
DECREASING TO POOR (10000 KNOT-FT) LATE IN THE
NIGHT.
LVORI...............3.
ADI.................5 TO 8.
CEILING (KFT).......9.0 DECREASING TO 5.0.
TIME (EDT) 6PM 7PM 8PM 9PM 10P 11P MID 1AM 2AM 3AM 4AM 5AM
SKY (%).........76 82 95 93 93 92 91 91 90 87 83 79
WEATHER COV.....
WEATHER TYPE....
TSTM COV........
CWR.............0 0 0 0 0 0 0 0 0 0 0 0
TEMP............42 39 37 36 35 35 34 34 33 33 33 33
DEWPOINT........20 21 23 25 25 24 25 25 26 27 27 28
RH..............41 48 56 64 66 64 69 69 75 78 78 82
HEAT INDEX (F)..38 35 33 32 31 31 31 31 30 29 29 29
20 FT WIND DIR..E E E E E E E E E E E E
20 FT WIND SPD..6 6 5 5 5 5 3 3 3 5 5 5
20 FT WIND GUST.12 12 13 12 10 10 10 9 9 9 10 10
SURFACE WND DIR.E E E E E E E E E E E E
SURFACE WND SPD.6 6 5 5 5 5 3 3 3 5 5 5
SURFACE WND GST.12 12 13 12 10 10 10 9 9 9 10 10
MIX HGT (KFT)...1.8 1.5 1.8 1.8 1.8 1.8 1.9 1.7 1.2 1.3 1.3 0.9
TRANSP WIND DIR.E E E E E E E E E E E E
TRANSP WIND SPD.12 12 13 12 12 12 12 12 10 10 12 13
LVORI...........2 2 2 3 3 3 3 3 4 4 4 4
ADI.............7 8 8 8 8 8 5 5 5 7 8 8
VRATE KT-FT/1K..18 15 19 19 18 18 19 16 12 13 13 10
VENTRATE CAT....PR PR PR PR PR PR PR PR PR PR PR PR
CEILING (KFT)...9.0 8.0 7.0 7.0 7.0 7.0 7.0 6.0 6.0 6.0 6.0 5.0
THURSDAY
SKY/WEATHER.........MOSTLY CLOUDY.
CWR.................0 PERCENT.
MAX TEMPERATURE.....AROUND 45.
MIN HUMIDITY........65 PERCENT.
DEWPOINT............30 INCREASING TO 33 LATE IN THE AFTERNOON.
MIN APPARENT TEMP...28.
SURFACE WINDS (MPH).EAST WINDS 5 TO 8 MPH.
WIND (20 FT)........EAST WINDS 5 TO 8 MPH.
MIXING HEIGHT.......2500 FT AGL.
TRANSPORT WINDS.....EAST 13 TO 16 MPH.
SMOKE DISPERSAL.....POOR (10700 KNOT-FT) EARLY IN THE MORNING
INCREASING TO GOOD (32500 KNOT-FT) IN THE
AFTERNOON.
LVORI...............4.
ADI.................8 TO 16 INCREASING TO 29 TO 33.
CEILING (KFT).......5.0 DECREASING TO 3.0 EARLY, THEN DECREASING TO
2.5 LATE IN THE MORNING INCREASING TO 3.0 EARLY
DECREASING TO 2.5 DECREASING TO 2.0 EARLY IN
THE AFTERNOON INCREASING TO 4.0.
TIME (EDT) 6AM 7AM 8AM 9AM 10A 11A 12P 1PM 2PM 3PM 4PM 5PM
SKY (%).........80 80 81 80 79 79 79 79 79 77 76 75
WEATHER COV.....
WEATHER TYPE....
TSTM COV........
CWR.............0 0 0 0 0 0 0 0 0 0 0 0
TEMP............33 33 33 36 39 41 42 43 44 44 44 43
DEWPOINT........28 29 29 30 31 32 32 32 33 33 33 33
RH..............82 85 85 79 73 70 67 65 65 65 65 67
HEAT INDEX (F)..29 29 28 31 34 36 38 38 39 39 40 39
20 FT WIND DIR..E E E E E E E E E E E E
20 FT WIND SPD..5 5 6 6 7 7 7 8 8 8 7 7
20 FT WIND GUST.12 12 13 13 16 17 17 16 16 16 16 16
SURFACE WND DIR.E E E E E E E E E E E E
SURFACE WND SPD.5 5 6 6 7 7 7 8 8 8 7 7
SURFACE WND GST.12 12 13 13 16 17 17 16 16 16 16 16
MIX HGT (KFT)...1.0 1.0 1.3 1.9 1.9 2.2 2.3 2.4 2.5 2.3 2.2 2.0
TRANSP WIND DIR.E E E E E E E E E E E E
TRANSP WIND SPD.13 13 14 15 14 16 14 15 15 15 15 15
LVORI...........4 4 4 3 3 3 3 3 3 3 3 3
ADI.............8 16 21 28 26 32 29 31 33 32 31 30
VRATE KT-FT/1K..11 11 16 25 23 30 28 30 33 31 29 27
VENTRATE CAT....PR PR PR PR PR PR PR PR PR PR PR PR
CEILING (KFT)...5.0 5.0 3.0 2.5 2.5 3.0 2.5 2.5 2.0 4.0 4.5 4.5
FORECASTER...HRENCECIN
REQUESTED BY...IWUC
TYPE OF REQUEST...PRESCRIBED
.TAG 2505961.0/BOX
.DELDT 03/11/25
.FORMATTERVERSION 2.0.0
.EMAIL MATTHEW.IWUC@DEM.RI.GOV
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