800
FNUS71 KPHI 241222
FWSPHI
SPOT FORECAST FOR TREXLER UNIT 1...PA GAME COMMISSION
NATIONAL WEATHER SERVICE MOUNT HOLLY NJ
ISSUED BY NATIONAL WEATHER SERVICE BALTIMORE MD/WASHINGTON DC
822 AM EDT FRI APR 24 2026
FORECAST IS BASED ON IGNITION TIME OF 0900 EDT ON APRIL 24.
IF CONDITIONS BECOME UNREPRESENTATIVE, CONTACT THE NATIONAL WEATHER
SERVICE.
PLEASE CONTACT OUR OFFICE IF YOU HAVE QUESTIONS
OR CONCERNS WITH THIS FORECAST.
DISCUSSION
A BACK DOOR COLD FRONT SLIDES SOUTH THROUGH THE REGION TODAY. LOW
PRESSURE DEVELOPING OVER THE GREAT LAKES TONIGHT WILL PASS OVER THE
AREA TOMORROW BEFORE DEPARTING OFFSHORE ON SUNDAY. HIGH PRESSURE
BRIEFLY BUILDS IN ON MONDAY. ANOTHER FRONTAL SYSTEM APPROACHES THE
REGION ON TUESDAY.
TODAY WILL BE PARTLY TO MOSTLY CLOUDY BUT DRY WITH LIGHT ONSHORE
FLOW. MIN_RH IS EXPECTED TO DROP INTO THE LOWER 40S THIS
AFTERNOON. RAIN CHANCES HOLD OFF UNTIL AFTER DARK, BECOMING
INCREASINGLY LIKELY LATE TONIGHT. FAIR TO GOOD SMOKE DISPERSION IS
ANTICIPATED THROUGH THIS EVENING BEFORE BECOMING POOR OVERNIGHT
DUE TO DECREASING MIXING HEIGHTS AND WEAKER WINDS.
REST OF TODAY
SKY/WEATHER.........PARTLY SUNNY (65-75 PERCENT).
CWR.................10 PERCENT.
CHANCE OF PCPN......10 PERCENT.
MAX TEMPERATURE.....AROUND 68.
MIN HUMIDITY........43 PERCENT.
WIND SHIFT..........NA
WIND (20 FT)........NORTHEAST WINDS 5 TO 6 MPH SHIFTING TO THE EAST
AROUND 6 MPH EARLY IN THE AFTERNOON, THEN
SHIFTING TO THE NORTH LATE IN THE AFTERNOON.
MIXING HEIGHT.......4600 FT AGL.
TRANSPORT WINDS.....NORTH 8 TO 10 MPH SHIFTING TO THE NORTHWEST 7
TO 8 MPH LATE IN THE AFTERNOON.
SMOKE DISPERSAL.....FAIR (13400 KNOT-FT) EARLY IN THE MORNING
INCREASING TO GOOD (33200 KNOT-FT) IN THE
AFTERNOON.
ADI.................20 TO 45.
TIME (EDT) 9AM 10A 11A 12P 1PM 2PM 3PM 4PM 5PM
SKY (%).........62 71 77 73 75 75 72 64 59
WEATHER COV.....
WEATHER TYPE....
TSTM COV........
CWR.............10 10 10 10 10 10 10 10 10
CHC OF PCPN (%).10 10 10 10 10 10 10 10 10
TEMP............54 58 60 63 64 66 68 67 67
RH..............74 62 58 50 48 47 43 45 45
20 FT WIND DIR..NE NE NE NE E SE SE NW NW
20 FT WIND SPD..5 6 6 5 5 6 6 6 6
20 FT WIND GUST.9 9 10 8 8 9 10 10 12
MIX HGT (KFT)...1.7 2.5 3.2 3.6 4.1 4.5 4.6 4.2 4.0
TRANSP WIND DIR.N N N N N NW NW NW NW
TRANSP WIND SPD.9 9 10 9 9 8 8 8 7
ADI.............20 29 41 41 45 42 43 40 33
VRATE KT-FT/1K..13 20 29 29 33 31 32 30 24
VENTRATE CAT....PR PR PR PR PR PR PR PR PR
TONIGHT
SKY/WEATHER.........MOSTLY CLOUDY (75-85 PERCENT). SLIGHT CHANCE OF
RAIN EARLY IN THE EVENING, THEN CHANCE OF RAIN
EARLY IN THE EVENING. RAIN LIKELY AFTER 3 AM.
CWR.................20 PERCENT INCREASING TO 70 PERCENT.
CHANCE OF PCPN......70 PERCENT.
MIN TEMPERATURE.....AROUND 44.
MAX HUMIDITY........93 PERCENT.
WIND SHIFT..........NA
WIND (20 FT)........NORTHWEST WINDS AROUND 5 MPH EARLY IN THE
EVENING BECOMING LIGHT, THEN BECOMING NORTHEAST
5 TO 7 MPH LATE IN THE EVENING.
MIXING HEIGHT.......500 FT AGL.
TRANSPORT WINDS.....NORTH AROUND 8 MPH SHIFTING TO THE EAST 5 TO 9
MPH IN THE EVENING, THEN INCREASING TO 12 TO 13
MPH OVERNIGHT.
SMOKE DISPERSAL.....FAIR (22400 KNOT-FT) EARLY IN THE EVENING
DECREASING TO POOR (2800 KNOT-FT) LATE IN THE
NIGHT.
ADI.................2 TO 32.
TIME (EDT) 6PM 7PM 8PM 9PM 10P 11P MID 1AM 2AM 3AM 4AM 5AM
SKY (%).........65 67 81 87 88 91 91 90 92 93 95 96
WEATHER COV.....SCH SCH CHC CHC CHC CHC CHC CHC CHC CHC LKY LKY
WEATHER TYPE....RN RN RN RN RN RN RN RN RN RN RN RN
TSTM COV........
CWR.............20 20 30 30 30 30 30 40 40 40 60 70
CHC OF PCPN (%).20 20 30 30 30 30 30 40 40 40 60 70
TEMP............66 65 62 61 58 57 55 53 51 50 49 48
RH..............47 48 56 56 62 64 69 74 80 80 83 86
20 FT WIND DIR..NW NW SW S NE NE NE NE NE E E E
20 FT WIND SPD..5 3 2 1 2 5 6 6 6 6 7 8
20 FT WIND GUST.9 7 5 3 5 7 9 10 12 12 13 15
MIX HGT (KFT)...3.2 0.7 0.5 0.6 0.8 0.7 0.5 1.0 1.3 1.6 1.3 1.3
TRANSP WIND DIR.N NE NE E E E E E E E E E
TRANSP WIND SPD.8 5 7 8 9 8 9 12 12 13 13 13
ADI.............32 2 3 4 4 5 6 8 8 8 8 11
VRATE KT-FT/1K..22 3 3 4 6 5 4 10 13 18 14 14
VENTRATE CAT....PR PR PR PR PR PR PR PR PR PR PR PR
SATURDAY
SKY/WEATHER.........CLOUDY (90-100 PERCENT). RAIN.
CWR.................80 PERCENT INCREASING TO 90 PERCENT EARLY IN
THE MORNING.
CHANCE OF PCPN......90 PERCENT.
MAX TEMPERATURE.....AROUND 48.
MIN HUMIDITY........83 PERCENT.
WIND SHIFT..........NA
WIND (20 FT)........EAST WINDS 8 TO 12 MPH.
MIXING HEIGHT.......2100 FT AGL.
TRANSPORT WINDS.....EAST 14 TO 22 MPH.
SMOKE DISPERSAL.....FAIR (17300 KNOT-FT) EARLY IN THE MORNING
INCREASING TO GOOD (40300 KNOT-FT) IN THE
AFTERNOON.
ADI.................15 EARLY IN THE MORNING INCREASING TO 56 IN THE
AFTERNOON.
TIME (EDT) 6AM 7AM 8AM 9AM 10A 11A 12P 1PM 2PM 3PM 4PM 5PM
SKY (%).........95 94 93 92 91 90 91 91 92 92 92 92
WEATHER COV.....DEF DEF DEF DEF DEF DEF DEF DEF DEF DEF DEF DEF
WEATHER TYPE....RN RN RN RN RN RN RN RN RN RN RN RN
TSTM COV........
CWR.............80 80 90 90 90 90 90 90 90 90 90 90
CHC OF PCPN (%).80 80 90 90 90 90 90 90 90 90 90 90
TEMP............46 46 46 45 46 47 47 47 46 46 46 46
RH..............89 89 86 93 89 86 86 86 89 89 86 86
20 FT WIND DIR..E E E E E E E E E E E E
20 FT WIND SPD..8 9 9 10 10 10 12 12 13 13 13 13
20 FT WIND GUST.15 15 15 17 18 20 21 21 22 22 22 22
MIX HGT (KFT)...1.4 1.5 1.9 1.9 2.1 2.1 2.0 2.0 2.0 2.0 1.9 1.9
TRANSP WIND DIR.E E E E E E E E E E E E
TRANSP WIND SPD.14 15 18 21 22 22 21 21 21 21 21 21
ADI.............15 30 43 49 55 56 40 40 40 40 39 39
VRATE KT-FT/1K..17 20 30 34 39 40 36 36 37 36 35 34
VENTRATE CAT....PR PR PR PR PR FR PR PR PR PR PR PR
FORECASTER...DHOF/LWX
REQUESTED BY...JARRID DOYLE
TYPE OF REQUEST...PRESCRIBED
.TAG 2611585.0/PHI
.DELDT 04/24/26
.FORMATTERVERSION 2.0.0
.EMAIL JADOYLE@PA.GOV
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