471  
FXUS61 KPHI 180336  
AFDPHI  
 
AREA FORECAST DISCUSSION  
NATIONAL WEATHER SERVICE MOUNT HOLLY NJ  
1136 PM EDT TUE OCT 17 2017  
   
SYNOPSIS
 
 
HIGH PRESSURE CENTERED OVER THE MID-ATLANTIC REGION WILL  
DOMINATE THE WEATHER PATTERN THROUGH THE UPCOMING WEEKEND. THE  
ONLY INTERRUPTION WILL BE A WEAK FRONTAL BOUNDARY APPROACHING  
FROM THE NORTH WEDNESDAY NIGHT INTO EARLY THURSDAY. AS THE HIGH  
MOVES OFF THE COAST THIS WEEKEND, A STRONG SOUTHERLY FLOW WILL  
BRING MUCH WARMER- THAN-NORMAL TEMPERATURES TO THE REGION  
THROUGH MONDAY. A SERIES OF COLD FRONTS WILL USHER IN RAIN...AND  
COLDER TEMPERATURES...DURING THE FIRST HALF OF NEXT WEEK.  
 

 
   
NEAR TERM /UNTIL 6 AM WEDNESDAY MORNING/
 
 
CLEAR AND COLD THROUGH THE OVERNIGHT AS HIGH PRESSURE DOMINATES  
THE EAST COAST. FROST ADVISORY IN EFFECT FOR NJ PINE BARRENS.  
PATCHY FROST OTHERWISE ACROSS DELMARVA, LEHIGH VALLEY, AND  
NORTHERN AND CENTRAL NJ. LOWS TONIGHT IN THE LOW/MID 30S OVER  
RURAL NJ AND UPPER 30S TO LOW 40S ELSEWHERE.  
 

 
   
SHORT TERM /6 AM WEDNESDAY MORNING THROUGH 6 PM WEDNESDAY/
 
 
HIGH PRESSURE CONTINUES ACROSS THE REGION. ANOTHER SUNNY DAY IS  
EXPECTED AREA-WIDE. TEMPERATURES WILL MODERATE BACK TO A COUPLE  
DEGREES ABOVE NORMAL LEVELS WITH HIGHS IN THE UPPER 60S TO LOW  
70S. WINDS WILL BE LIGHT MOSTLY FROM THE SW.  
 

 
   
LONG TERM /WEDNESDAY NIGHT THROUGH TUESDAY/
 
 
THE MID-LEVEL PATTERN ASSOCIATED WITH THE LONG TERM PERIOD  
BEGINS WITH A LOW-AMPLITUDE RIDGE ACROSS THE EASTERN SECTION OF  
THE COUNTRY WEDNESDAY NIGHT. A WEAK TROUGH MOVES THROUGH EARLY  
THURSDAY BEFORE ANOTHER MID-LEVEL RIDGE SETS UP SHOP OVER THE  
EAST COAST BY FRIDAY, WITH THE AMPLITUDE OF THIS RIDGE  
INCREASING THROUGH THE WEEKEND. A DEEP MID-LEVEL TROUGH THEN  
APPROACHES FROM THE WEST LATE TUESDAY, SIGNIFYING MAJOR CHANGES  
NEXT WEEK.  
 
AT THE SURFACE, HIGH PRESSURE CENTERED OVER THE CENTRAL  
APPLACHIANS WEDNESDAY MORNING WILL DRIFT SOUTH WEDNESDAY NIGHT  
AND THURSDAY AS A WEAK BOUNDARY SLIDES IN FROM THE NORTH. NO  
PRECIPITATION IS EXPECTED WITH THIS BOUNDARY, SO ITS ONLY  
NOTICEABLE EFFECT MAY BE A SLIGHT SHIFT IN WIND DIRECTION AND A  
SLIGHT DROP IN RELATIVE HUMIDITY. THEN AS THE SURFACE HIGH  
BEGINS TO PUSH BACK NORTH, THE NICE WEATHER WILL CONTINUE. WITH  
THE AMPLITUDE OF MID-LEVEL RIDGING INCREASING INTO EARLY NEXT  
WEEK, AND A SOUTHERLY FLOW AT THE SURFACE, TEMPERATURES WILL  
CONTINUE TO RISE TOO, MAXING OUT 10 TO 15 DEGREES ABOVE NORMAL  
ON SATURDAY, SUNDAY, AND MONDAY. A COLD FRONT WILL BEGIN TO COOL  
TEMPERATURES DOWN MONDAY NIGHT, WITH A STRONGER COLD FRONT ON  
TUESDAY BRINGING WITH IT THE COLDEST TEMPERATURES OF THE AUTUMN  
SEASON SO FAR BY THE MIDDLE OF NEXT WEEK.  
 

 
   
AVIATION /04Z WEDNESDAY THROUGH SUNDAY/
 
 
THE FOLLOWING DISCUSSION IS FOR KPHL, KPNE, KTTN, KABE, KRDG,  
KILG, KMIV, KACY AND SURROUNDING AREAS.  
 
VFR THROUGH WEDNESDAY NIGHT. LIGHT WINDS THROUGH DAYBREAK, AND  
THEN LIGHT SW WINDS ON WEDNESDAY.  
 
OUTLOOK...  
WEDNESDAY NIGHT THROUGH SUNDAY...VFR.  
 

 
   
MARINE
 
 
LIGHT WINDS AND FAIR WEATHER THROUGH WEDNESDAY.  
 
OUTLOOK...  
WEDNESDAY NIGHT THROUGH SUNDAY...NO MARINE HEADLINES EXPECTED.  
 

 
   
PHI WATCHES/WARNINGS/ADVISORIES
 
 
PA...NONE.  
NJ...FROST ADVISORY UNTIL 9 AM EDT WEDNESDAY FOR NJZ020>022-027.  
DE...NONE.  
MD...NONE.  
MARINE...NONE.  
 

 
 

 
SYNOPSIS...MIKETTA  
NEAR TERM...MPS  
SHORT TERM...O'HARA  
LONG TERM...MIKETTA  
AVIATION...MEOLA/MIKETTA/MPS/O'HARA  
MARINE...MIKETTA/MPS/O'HARA  
 
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