247  
FNUS71 KPHI 120909  
FWSPHI  
 
SPOT FORECAST FOR SGL 205 FIELDS...PA GAME COMMISSION  
NATIONAL WEATHER SERVICE MOUNT HOLLY NJ  
509 AM EDT TUE SEP 12 2017  
 
FORECAST IS BASED ON IGNITION TIME OF 0800 EDT ON SEPTEMBER 12.  
IF CONDITIONS BECOME UNREPRESENTATIVE...CONTACT THE NATIONAL WEATHER  
SERVICE.  
 
PLEASE CONTACT OUR OFFICE IF YOU HAVE QUESTIONS OR CONCERNS WITH THIS FORECAST.  
   
DISCUSSION
 
 
SURFACE HIGH PRESSURE WILL PERSIST ACROSS THE REGION TODAY. THE  
REMNANTS OF IRMA WILL TRACK SLOWLY NORTHEASTWARD FROM THE  
TENNESSEE AND OHIO VALLEYS TO THE MID-ATLANTIC REGION FROM MID  
TO LATE WEEK. WEAK HIGH PRESSURE MAY BUILD INTO THE AREA THIS  
WEEKEND.  
   
TODAY
 
 
SKY/WEATHER.........MOSTLY SUNNY (35-45 PERCENT).  
CWR.................0 PERCENT.  
CHANCE OF PCPN......0 PERCENT.  
MAX TEMPERATURE.....AROUND 80.  
MIN HUMIDITY........42 PERCENT.  
WIND SHIFT..........NW TO SW THIS AFTERNOON.  
WIND (20 FT)........LIGHT WINDS.  
MIXING HEIGHT.......0-1300 FT AGL, INCREASING TO 2100-3700 FT AGL  
LATE IN THE MORNING.  
 
TIME (EDT) 8AM 9AM 10A 11A 12P 1PM 2PM 3PM 4PM 5PM  
SKY (%).........45 41 37 33 33 33 33 36 39 42  
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............57 61 66 71 74 76 78 79 78 78  
RH..............80 72 65 57 51 46 43 42 43 43  
20 FT WIND DIR..NW NW NE SE E S S SW SW SW  
20 FT WIND SPD..3 1 1 0 1 1 3 3 3 3  
20 FT WIND GUST.4 2 2 2 6 6 6 6  
MIX HGT (KFT)...0.1 0.6 1.3 2.1 2.7 3.2 3.6 3.7 3.7 3.5  
   
TONIGHT
 
 
SKY/WEATHER.........PARTLY CLOUDY (40-50 PERCENT), THEN BECOMING  
MOSTLY CLOUDY (60-70 PERCENT). A SLIGHT CHANCE  
OF SHOWERS LATE.  
CWR.................10 PERCENT, INCREASING TO 20 PERCENT.  
CHANCE OF PCPN......20 PERCENT.  
MIN TEMPERATURE.....AROUND 57.  
MAX HUMIDITY........81 PERCENT.  
WIND SHIFT..........SW TO W-NW LATE THIS EVENING AND OVERNIGHT.  
WIND (20 FT)........LIGHT WINDS, BECOMING WEST AROUND 5 MPH IN THE  
LATE EVENING AND EARLY MORNING, THEN BECOMING  
LIGHT LATE.  
MIXING HEIGHT.......1700-3000 FT AGL, DECREASING TO 0-1000 FT AGL  
IN THE LATE EVENING AND OVERNIGHT.  
 
TIME (EDT) 6PM 7PM 8PM 9PM 10P 11P MID 1AM 2AM 3AM 4AM 5AM  
SKY (%).........44 46 49 50 52 53 58 63 68 68 68 68  
WEATHER COV..... SCH  
WEATHER TYPE.... RW  
TSTM COV........  
CWR.............0 0 0 0 0 0 0 10 10 10 10 20  
CHC OF PCPN (%).0 0 0 0 0 0 0 10 10 10 10 20  
TEMP............76 72 69 67 66 64 63 63 62 61 60 60  
RH..............46 55 61 65 68 70 72 72 75 78 81 81  
20 FT WIND DIR..SW SW SW W W W W W W NW NW NW  
20 FT WIND SPD..3 3 3 3 5 5 5 5 5 3 3 2  
20 FT WIND GUST.5 4 4 4 4 4  
MIX HGT (KFT)...3.0 2.4 1.7 1.0 0.4 0.1 0.1 0.1 0.1 0.1 0.1 0.1  
   
WEDNESDAY
 
 
SKY/WEATHER.........MOSTLY CLOUDY (75-85 PERCENT). A SLIGHT CHANCE  
OF SHOWERS EARLY IN THE MORNING, THEN A CHANCE  
OF SHOWERS LATE IN THE MORNING.  
CWR.................20 PERCENT, INCREASING TO 30 PERCENT LATE IN  
THE MORNING.  
CHANCE OF PCPN......30 PERCENT.  
MAX TEMPERATURE.....AROUND 76.  
MIN HUMIDITY........64 PERCENT.  
WIND SHIFT..........NW TO S AROUND MIDDAY.  
WIND (20 FT)........LIGHT WINDS, BECOMING SOUTH AROUND 5 MPH EARLY  
IN THE AFTERNOON.  
MIXING HEIGHT.......0-1500 FT AGL, INCREASING TO 2200-3100 FT AGL  
LATE IN THE MORNING.  
 
TIME (EDT) 6AM 7AM 8AM 9AM 10A 11A 12P 1PM 2PM 3PM 4PM 5PM  
SKY (%).........72 75 79 82 84 87 84 82 79 78 76 75  
WEATHER COV.....SCH SCH CHC CHC CHC CHC CHC CHC CHC CHC CHC CHC  
WEATHER TYPE....RW RW RW RW RW RW RW RW RW RW RW RW  
TSTM COV........  
CWR.............20 20 30 30 30 30 30 30 30 30 30 30  
CHC OF PCPN (%).20 20 30 30 30 30 30 30 30 30 30 30  
TEMP............60 61 61 67 70 72 73 74 75 75 75 75  
RH..............84 84 76 71 68 65 64 64 64 66 68 71  
20 FT WIND DIR..NW NW NW W SW S S S S S S S  
20 FT WIND SPD..2 1 1 2 2 3 3 3 5 5 5 5  
20 FT WIND GUST. 4 4 5 6 6 6  
MIX HGT (KFT)...0.1 0.1 0.1 0.7 1.5 2.2 2.7 2.9 3.0 3.1 3.0 2.7  
 

 
FORECASTER...KLEIN/SHAFER  
REQUESTED BY...STEVE FERRERI  
TYPE OF REQUEST...PRESCRIBED  
.TAG 1715726.0/PHI  
.EMAIL AFERRERI@PA.GOV  
 
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