648  
FNUS71 KPHI 090933  
FWSPHI  
 
SPOT FORECAST FOR MILLERTOWN RD RX...DCNR  
NATIONAL WEATHER SERVICE MOUNT HOLLY NJ  
533 AM EDT WED MAY 9 2018  
 
FORECAST IS BASED ON IGNITION TIME OF 0700 EDT ON MAY 09.  
IF CONDITIONS BECOME UNREPRESENTATIVE...CONTACT THE NATIONAL WEATHER  
SERVICE.  
 
PLEASE CONTACT OUR OFFICE IF YOU HAVE QUESTIONS OR CONCERNS WITH THIS FORECAST.  
   
DISCUSSION
 
 
VERY DRY CONDITIONS ARE FORECAST TODAY, THOUGH WINDS SHOULD BE  
LIGHT. WINDS AND THE CHANCE FOR RAIN ARE FORECAST TO INCREASE  
BEGINNING THURSDAY MORNING.  
 
A WEAK RIDGE OF HIGH PRESSURE WILL REMAIN ACROSS THE MID-ATLANTIC  
TODAY AS A SURFACE LOW OFFSHORE MOVES INTO THE CANADIAN MARITIMES BY  
THURSDAY. A COLD FRONT WILL MOVE THROUGH THE REGION LATE THIS WEEK  
BEFORE STALLING TO OUR SOUTH. THE FRONT IS THEN EXPECTED TO RETURN  
NORTHWARD AS A WARM FRONT FRIDAY NIGHT AND SATURDAY AND THEN BACK  
SOUTHWARD AS A COLD FRONT SUNDAY AND MONDAY.  
   
REST OF TODAY
 
 
SKY/WEATHER.........MOSTLY SUNNY (30-40 PERCENT).  
CWR.................10 PERCENT.  
CHANCE OF PCPN......10 PERCENT.  
LAL.................NO TSTMS.  
MAX TEMPERATURE.....AROUND 76.  
MIN HUMIDITY........37 PERCENT.  
WIND SHIFT..........MAY START LIGHT AND VARIABLE BUT SETTLE OUT OF  
THE SOUTH BY MID DAY.  
WIND (20 FT)........LIGHT WINDS BECOMING SOUTH 5 TO 6 MPH IN THE  
AFTERNOON.  
MIXING HEIGHT.......300-1000 FT AGL INCREASING TO 7100-7400 FT AGL  
LATE IN THE MORNING.  
TRANSPORT WINDS.....NORTHWEST AROUND 1 MPH SHIFTING TO THE SOUTH 2  
TO 8 MPH LATE IN THE MORNING.  
 
TIME (EDT) 7AM 8AM 9AM 10A 11A 12P 1PM 2PM 3PM 4PM 5PM  
SKY (%).........32 35 35 36 37 38 39 40 37 35 32  
WEATHER COV.....  
WEATHER TYPE....  
TSTM COV........  
CWR.............0 0 0 0 0 0 0 10 10 10 10  
CHC OF PCPN (%).0 0 0 0 0 0 0 10 10 10 10  
LAL.............1 1 1 1 1 1 1 1 1 1 1  
TEMP............46 52 57 63 67 69 72 73 74 74 74  
RH..............93 76 62 51 44 42 38 37 37 38 40  
20 FT WIND DIR..NW NW N E SE SE SE S S S S  
20 FT WIND SPD..1 2 2 2 3 5 5 6 6 6 6  
20 FT WIND GUST. 4 6 6  
MIX HGT (KFT)...0.3 1.0 1.0 1.0 7.3 7.3 7.3 7.4 7.4 7.4 7.1  
TRANSP WIND DIR.W NW NW NW E E E S S S S  
TRANSP WIND SPD.1 1 1 1 2 2 2 5 5 5 8  
   
TONIGHT
 
 
SKY/WEATHER.........PARTLY CLOUDY (25-35 PERCENT).  
CWR.................10 PERCENT.  
CHANCE OF PCPN......10 PERCENT.  
LAL.................NO TSTMS.  
MIN TEMPERATURE.....AROUND 48.  
MAX HUMIDITY........74 PERCENT.  
WIND SHIFT..........NONE EXPECTED.  
WIND (20 FT)........SOUTH WINDS 5 TO 6 MPH IN THE EVENING BECOMING  
LIGHT.  
MIXING HEIGHT.......7100 FT AGL DECREASING TO 300-400 FT AGL EARLY  
IN THE EVENING.  
TRANSPORT WINDS.....SOUTH 2 TO 8 MPH.  
 
TIME (EDT) 6PM 7PM 8PM 9PM 10P 11P MID 1AM 2AM 3AM 4AM 5AM  
SKY (%).........30 27 25 24 24 24 23 23 22 28 34 40  
WEATHER COV.....  
WEATHER TYPE....  
TSTM COV........  
CWR.............10 10 0 0 0 0 0 0 0 0 0 10  
CHC OF PCPN (%).10 10 0 0 0 0 0 0 0 0 0 10  
LAL.............1 1 1 1 1 1 1 1 1 1 1 1  
TEMP............72 69 66 63 61 59 57 56 54 53 52 51  
RH..............42 45 50 52 51 57 57 59 64 66 71 74  
20 FT WIND DIR..S S S S S S S S S S S S  
20 FT WIND SPD..6 6 6 6 5 5 3 3 3 3 2 3  
20 FT WIND GUST. 6 6 4 4 4 4 4  
MIX HGT (KFT)...7.1 7.1 0.4 0.4 0.4 0.3 0.3 0.3 0.3 0.3 0.3 0.3  
TRANSP WIND DIR.S S S S S SW SW SW S S S S  
TRANSP WIND SPD.8 8 6 6 6 3 3 3 2 2 2 2  
   
THURSDAY
 
 
SKY/WEATHER.........PARTLY SUNNY (60-70 PERCENT). CHANCE OF RAIN  
SHOWERS THROUGH THE DAY. CHANCE OF  
THUNDERSTORMS IN THE AFTERNOON.  
CWR.................20 PERCENT INCREASING TO 50 PERCENT.  
CHANCE OF PCPN......50 PERCENT.  
LAL.................NO TSTMS UNTIL 1400, THEN 9-15 STRIKES.  
MAX TEMPERATURE.....AROUND 72.  
MIN HUMIDITY........55 PERCENT.  
WIND SHIFT..........SHIFTING FROM SOUTHERLY TO SOUTHWESTERLY IN THE  
AFTERNOON  
WIND (20 FT)........LIGHT WINDS BECOMING SOUTHWEST 5 TO 9 MPH WITH  
GUSTS TO AROUND 17 MPH. GUSTY AND ERRATIC WINDS  
EXPECTED NEAR THUNDERSTORMS EARLY IN THE  
AFTERNOON.  
MIXING HEIGHT.......300-900 FT AGL INCREASING TO 1800-3200 FT AGL  
LATE IN THE MORNING.  
TRANSPORT WINDS.....SOUTH 2 TO 10 MPH INCREASING TO SOUTHWEST 21 TO  
23 MPH LATE IN THE MORNING.  
 
TIME (EDT) 6AM 7AM 8AM 9AM 10A 11A 12P 1PM 2PM 3PM 4PM 5PM  
SKY (%).........45 51 57 63 69 74 78 82 86 85 84 84  
WEATHER COV.....SCH CHC 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........ SCH SCH SCH CHC  
CWR.............20 30 30 30 30 30 30 30 50 50 50 50  
CHC OF PCPN (%).20 30 30 30 30 30 30 30 50 50 50 50  
LAL.............1 1 1 1 1 1 1 1 3 3 3 3  
TEMP............51 52 55 59 62 65 67 69 70 71 71 71  
RH..............74 77 74 67 62 58 56 55 55 55 57 59  
20 FT WIND DIR..S S S S S S S S SW SW SW SW  
20 FT WIND SPD..3 6 5 6 7 8 9 9 9 9 9 9  
20 FT WIND GUST.4 8 11 14 16 17 17 17 16 16 14  
MIX HGT (KFT)...0.3 0.3 0.9 0.9 0.9 3.0 3.0 3.0 3.2 3.2 3.2 1.8  
TRANSP WIND DIR.S S S S S S S S SW SW SW W  
TRANSP WIND SPD.2 2 10 10 10 23 23 23 22 22 22 21  
 

 
FORECASTER...JOHNSON  
REQUESTED BY...TODD BREININGER  
TYPE OF REQUEST...PRESCRIBED  
.TAG 1809391.2/PHI  
.DELDT 05/09/18  
.EMAIL SHTURNER@PA.GOV  
 
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