285
FNUS71 KPHI 120807
FWSPHI
SPOT FORECAST FOR SGL 38 WS5 RX FIRE...PA
NATIONAL WEATHER SERVICE MOUNT HOLLY NJ
407 AM EDT TUE MAY 12 2026
FORECAST IS BASED ON IGNITION TIME OF 0800 EDT ON MAY 12.
IF CONDITIONS BECOME UNREPRESENTATIVE, CONTACT THE NATIONAL WEATHER
SERVICE.
PLEASE CONTACT OUR OFFICE IF YOU HAVE QUESTIONS
OR CONCERNS WITH THIS FORECAST.
DISCUSSION
HIGH PRESSURE BUILDS ACROSS THE MIDDLE ATLANTIC REGION TODAY AND
THEN MOVES OFFSHORE TONIGHT. LOW PRESSURE AND ITS ASSOCIATED FRONTS
ARRIVE WEDNESDAY INTO THURSDAY. HIGH PRESSURE THEN BUILDS IN LATER
FRIDAY AND INTO THE WEEKEND.
REST OF TODAY
SKY/WEATHER.........SUNNY (0-10 PERCENT).
CWR.................0 PERCENT.
CHANCE OF PCPN......0 PERCENT.
MAX TEMPERATURE.....AROUND 61.
MIN HUMIDITY........33 PERCENT.
WIND SHIFT..........
WIND (20 FT)........NORTHWEST WINDS 5 TO 7 MPH EARLY IN THE MORNING
BECOMING LIGHT, THEN BECOMING WEST 5 TO 7 MPH
LATE IN THE AFTERNOON.
MIXING HEIGHT.......5800 FT AGL.
TRANSPORT WINDS.....NORTH 9 TO 13 MPH SHIFTING TO THE WEST 9 TO 10
MPH LATE IN THE AFTERNOON.
SMOKE DISPERSAL.....FAIR (15200 KNOT-FT) EARLY IN THE MORNING
INCREASING TO GOOD (52000 KNOT-FT) IN THE
AFTERNOON.
ADI.................23 EARLY IN THE MORNING INCREASING TO 73 IN THE
AFTERNOON.
TIME (EDT) 8AM 9AM 10A 11A 12P 1PM 2PM 3PM 4PM 5PM
SKY (%).........2 2 3 3 1 2 2 7 6 8
WEATHER COV.....
WEATHER TYPE....
TSTM COV........
CWR.............0 0 0 0 0 0 0 0 0 0
CHC OF PCPN (%).0 0 0 0 0 0 0 0 0 0
TEMP............40 44 47 51 54 56 58 59 59 60
RH..............70 60 51 44 40 37 34 33 33 33
20 FT WIND DIR..N N N NW NW NW NW W W W
20 FT WIND SPD..8 7 6 5 5 5 5 5 5 6
20 FT WIND GUST.16 14 12 10 9 9 12 10 12 12
MIX HGT (KFT)...1.4 2.7 4.0 4.7 4.9 5.4 5.7 5.7 5.7 5.8
TRANSP WIND DIR.N N N N NW NW NW NW W W
TRANSP WIND SPD.13 13 12 10 9 9 10 10 9 10
ADI.............23 43 59 61 57 61 73 73 64 73
VRATE KT-FT/1K..15 30 40 42 40 43 51 52 46 52
VENTRATE CAT....PR PR FR FR PR FR FR FR FR FR
TONIGHT
SKY/WEATHER.........PARTLY CLOUDY (25-35 PERCENT) THEN BECOMING
MOSTLY CLOUDY (70-80 PERCENT).
CWR.................10 PERCENT.
CHANCE OF PCPN......10 PERCENT.
MIN TEMPERATURE.....AROUND 43.
MAX HUMIDITY........86 PERCENT.
WIND SHIFT..........
WIND (20 FT)........WEST WINDS AROUND 5 MPH EARLY IN THE EVENING
BECOMING LIGHT, THEN BECOMING SOUTH 5 TO 7 MPH
OVERNIGHT.
MIXING HEIGHT.......400 FT AGL.
TRANSPORT WINDS.....WEST 5 TO 9 MPH SHIFTING TO THE SOUTHWEST 6 TO
13 MPH IN THE LATE EVENING AND OVERNIGHT.
SMOKE DISPERSAL.....GOOD (41500 KNOT-FT) EARLY IN THE EVENING
DECREASING TO POOR (1800 KNOT-FT) LATE IN THE
NIGHT.
ADI.................59 EARLY IN THE EVENING DECREASING TO 2 LATE IN
THE NIGHT.
TIME (EDT) 6PM 7PM 8PM 9PM 10P 11P MID 1AM 2AM 3AM 4AM 5AM
SKY (%).........22 20 42 66 57 65 80 80 82 87 85 95
WEATHER COV.....
WEATHER TYPE....
TSTM COV........
CWR.............0 0 0 0 0 0 0 10 10 10 10 10
CHC OF PCPN (%).0 0 0 0 0 0 0 10 10 10 10 10
TEMP............58 56 54 49 48 46 46 45 45 45 44 45
RH..............37 42 48 58 58 63 63 65 68 70 79 79
20 FT WIND DIR..W W SW SW SW SW SW SW S S S S
20 FT WIND SPD..5 5 3 2 2 2 3 5 6 7 7 8
20 FT WIND GUST.10 9 7 5 6 7 9 12 14 15 16 17
MIX HGT (KFT)...5.2 2.6 0.5 0.4 0.5 0.5 0.5 0.5 0.6 0.6 0.6 0.6
TRANSP WIND DIR.W W W SW SW SW S SW S S S S
TRANSP WIND SPD.9 8 7 5 6 8 9 12 12 13 12 13
ADI.............59 4 3 2 3 4 4 8 8 8 8 11
VRATE KT-FT/1K..42 18 3 2 3 3 4 5 6 7 7 7
VENTRATE CAT....FR PR PR PR PR PR PR PR PR PR PR PR
WEDNESDAY
SKY/WEATHER.........MOSTLY CLOUDY (80-90 PERCENT). CHANCE OF RAIN
SHOWERS AND SLIGHT CHANCE OF THUNDERSTORMS IN
THE AFTERNOON.
CWR.................10 PERCENT INCREASING TO 20 PERCENT EARLY IN
THE AFTERNOON, THEN INCREASING TO 50 PERCENT
EARLY IN THE AFTERNOON DECREASING TO 30 PERCENT
LATE IN THE AFTERNOON DECREASING TO 20 PERCENT.
CHANCE OF PCPN......50 PERCENT.
MAX TEMPERATURE.....AROUND 63.
MIN HUMIDITY........60 PERCENT.
WIND SHIFT..........
WIND (20 FT)........SOUTH WINDS 8 TO 13 MPH. GUSTS UP TO 28 MPH
EARLY IN THE MORNING. GUSTY AND ERRATIC WINDS
EXPECTED NEAR THUNDERSTORMS LATE IN THE
AFTERNOON.
MIXING HEIGHT.......3800 FT AGL.
TRANSPORT WINDS.....SOUTH 13 TO 21 MPH SHIFTING TO THE SOUTHWEST 18
TO 24 MPH IN THE AFTERNOON.
SMOKE DISPERSAL.....POOR (7300 KNOT-FT) EARLY IN THE MORNING
INCREASING TO EXCELLENT (78900 KNOT-FT) IN THE
AFTERNOON.
ADI.................11 EARLY IN THE MORNING INCREASING TO 65 IN THE
AFTERNOON.
TIME (EDT) 6AM 7AM 8AM 9AM 10A 11A 12P 1PM 2PM 3PM 4PM 5PM
SKY (%).........93 90 88 88 84 84 76 82 85 77 83 83
WEATHER COV..... SCH CHC CHC SCH SCH
WEATHER TYPE.... RW RW RW RW RW
TSTM COV........ SCH
CWR.............10 10 10 10 0 0 10 20 50 30 20 20
CHC OF PCPN (%).10 10 10 10 0 0 10 20 50 30 20 20
TEMP............45 45 47 49 52 54 56 59 60 61 61 60
RH..............82 86 86 83 77 74 72 62 62 60 62 64
20 FT WIND DIR..S S S S S S S S S S S S
20 FT WIND SPD..8 8 9 10 12 12 13 14 14 13 12 12
20 FT WIND GUST.18 18 20 21 23 24 26 28 28 28 26 24
MIX HGT (KFT)...0.7 1.0 1.1 1.7 1.8 2.1 2.6 3.5 3.8 2.8 2.6 2.3
TRANSP WIND DIR.S S S S S S S S SW SW SW SW
TRANSP WIND SPD.13 14 15 18 20 21 21 24 24 18 20 21
ADI.............11 17 21 39 45 53 46 62 65 42 43 43
VRATE KT-FT/1K..7 12 15 27 31 38 46 73 79 44 44 41
VENTRATE CAT....PR PR PR PR PR PR FR GD GD FR FR FR
FORECASTER...OHARA
REQUESTED BY...BRIAN WILLIAMSON
TYPE OF REQUEST...PRESCRIBED
.TAG 2613320.1/PHI
.DELDT 05/12/26
.FORMATTERVERSION 2.0.0
.EMAIL BRIANWILLI@PA.GOV
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