147  
FNUS71 KPHI 161015  
FWSPHI  
 
SPOT FORECAST FOR VALLEY FORGE NHP JUNIOR RANGER DAY...DOI/NPS  
NATIONAL WEATHER SERVICE MOUNT HOLLY NJ  
615 AM EDT THU MAY 16 2024  
 
FORECAST IS BASED ON FORECAST START TIME OF 0700 EDT ON MAY 18.  
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 TRIES TO BUILD DOWN INTO THE AREA FROM THE  
NORTHEAST OVER THE WEEKEND, BUT STILL EXPECT TO HAVE RAIN CHANCES  
THROUGH THE DAY ON SATURDAY. ANOTHER AREA OF LOW PRESSURE MOVES  
ACROSS THE CENTRAL APPALACHIANS AND OFFSHORE OF THE NORTH CAROLINA  
COAST LATER SUNDAY INTO SUNDAY NIGHT. WEAK HIGH PRESSURE MAY  
FINALLY BUILD ACROSS THE AREA EARLY NEXT WEEK, BEFORE A COLD FRONT  
MOVES ACROSS THE EAST COAST BY MID WEEK.  
   
SATURDAY
 
 
SKY/WEATHER.........CLOUDY (90-100 PERCENT). CHANCE OF RAIN  
SHOWERS.  
CHANCE OF PCPN......50 PERCENT.  
MAX TEMPERATURE.....AROUND 68.  
MIN HUMIDITY........63 PERCENT.  
DEWPOINT............54.  
SURFACE WINDS (MPH).EAST WINDS AROUND 5 MPH INCREASING TO 5 TO 7  
MPH LATE IN THE MORNING.  
WIND (20 FT)........EAST WINDS 5 TO 6 MPH EARLY IN THE MORNING  
BECOMING LIGHT, THEN BECOMING EAST 5 TO 6 MPH  
LATE IN THE MORNING.  
ADI.................15 TO 47.  
 
TIME (EDT) 7AM 8AM 9AM 10A 11A 12P 1PM 2PM 3PM 4PM 5PM  
SKY (%).........100 100 99 99 98 98 97 96 94 93 92  
WEATHER COV.....CHC CHC CHC CHC CHC CHC CHC CHC CHC CHC CHC  
WEATHER TYPE....RW RW RW RW RW RW RW RW RW RW RW  
TSTM COV........  
CHC OF PCPN (%).40 40 40 40 50 50 50 30 30 30 30  
TEMP............56 57 58 59 61 63 65 66 67 67 67  
DEWPOINT........54 54 54 54 54 54 54 54 54 54 54  
RH..............93 90 86 83 78 72 68 65 63 63 63  
20 FT WIND DIR..E E E E E E E E E E E  
20 FT WIND SPD..3 3 5 5 5 6 6 6 7 7 7  
20 FT WIND GUST.6 7 8 8 9 9 10 10 12 12 12  
SURFACE WND DIR.E E E E E E E E E E E  
SURFACE WND SPD.3 3 5 5 5 6 6 6 7 7 7  
SURFACE WND GST.6 7 8 8 9 9 10 10 12 12 12  
ADI.............15 16 21 23 26 31 35 40 42 44 47  
 

 
FORECASTER...JOHNSON  
REQUESTED BY...ADAM GRESEK  
TYPE OF REQUEST...OTHER  
.TAG 2414287.0/PHI  
.DELDT 05/16/24  
.FORMATTERVERSION 2.0.0  
.EMAIL ADAM_GRESEK@NPS.GOV  
 
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