785
FXUS61 KPHI 180812
AFDPHI
AREA FORECAST DISCUSSION
NATIONAL WEATHER SERVICE MOUNT HOLLY NJ
312 AM EST MON NOV 18 2024
SYNOPSIS
HIGH PRESSURE WILL REESTABLISH ITSELF TODAY, REMAINING IN CONTROL
THROUGH TUESDAY EVENING. AN OCCLUDED FRONTAL SYSTEM IS FORECAST TO
MOVE ACROSS THE MID-ATLANTIC REGION WEDNESDAY NIGHT INTO THURSDAY AS
AN AREA OF LOW PRESSURE MOVES INTO THE GREAT LAKES THROUGH THURSDAY.
THIS LOW WILL BEGIN TO MOVE INTO THE NORTHEAST STATES FRIDAY, BEFORE
MOVING INTO THE CANADIAN MARITIMES FOR NEXT WEEKEND.
NEAR TERM /THROUGH TONIGHT/
QUIET WEATHER ACROSS THE AREA TODAY AND TONIGHT AS HIGH PRESSURE TO
THE SOUTH MOVES AWAY AND A RIDGE ACROSS THE OHIO VALLEY HEADS OUR
WAY. MOSTLY SUNNY SKIES ARE EXPECTED TODAY AND MAINLY CLEAR TONIGHT.
IT'LL REMAIN MILD WITH AN UPPER RIDGE BUILDING IN AS WELL. HIGHS
TODAY WILL REACH THE MID/UPPER 60S FOR S/E AREAS AND UPPER 50S/LOW
60S FOR THE SOUTHERN POCONOS AND NORTH NJ. WINDS WILL BE WEST TO
NORTHWEST AROUND 10 TO 15 MPH WITH SOME GUSTS TO 20 MPH DURING THE
LATE MORNING AND AFTERNOON.
FAIR WEATHER CONTINUES TONIGHT WITH CLEAR SKIES AND SEASONABLY COLD
TEMPERATURES. LOWS WILL DROP INTO THE UPPER 30S TO LOW 40S MOST
AREAS. LIGHT NORTHWEST WINDS ARE EXPECTED.
SHORT TERM /TUESDAY THROUGH WEDNESDAY/
ONE LAST DRY DAY ON TUESDAY BEFORE A PATTERN CHANGE COMES BRINGING
SOME MUCH NEEDED RAIN. HIGH PRESSURE RETREATS SLOWLY OFFSHORE WITH
AN OVERALL NICE DAY EXPECTED. CLOUDS INCREASE AS THE DAY GOES ON
AHEAD OF THE APPROACHING SYSTEM BUT TEMPERATURES WILL GET INTO THE
UPPER 50S/LOW 60S.
A WARM FRONT BEGINS TO LIFT NORTH ON TUESDAY NIGHT. A FEW SHOWERS
ARE LIKELY TO DEVELOP IN THE VICINITY OF THE FRONT, MAINLY SOUTH OF
PHILADELPHIA AS A WEAK SHORTWAVE DIVES IN AHEAD OF THE MAIN UPPER
LEVEL LOW. NOT EXPECTING MUCH, JUST A FEW SHOWERS OVERALL AND AREAS
NEAR/NORTH OF PHILADELPHIA SHOULD STAY DRY ON TUESDAY NIGHT. WARM
AIR ADVECTION BEGINS TO STRENGTHEN AS THE WARM FRONT PASSES, AND
WILL RESULT IN LOWS IN THE MID TO UPPER 40S FOR THE SOUTHERN HALF OF
THE AREA, AND UPPER 30S/LOW 40S IN THE NORTHERN HALF.
THE WEDNESDAY DAYTIME PERIOD LOOKS MAINLY DRY AS SHOWERS MOVE OUT OF
THE SOUTHERN ZONES BY THE LATE MORNING. SHORTWAVE RIDGING MOVES
OVERHEAD AND OFFSHORE BEFORE AN EXPANSIVE AND COMPLEX UPPER LEVEL
SYSTEM MOVES IN. SOME SHOWERS ARE POSSIBLE LATE IN THE DAY, MAINLY
IN THE LEHIGH VALLEY AND POCONOS. ABOVE NORMAL TEMPERATURES ARE
EXPECTED WITH THE WARM FRONT LIFTING THROUGH, WITH A SPREAD OF 60S
ANTICIPATED, WITH 50S IN THE HIGHER ELEVATIONS.
LONG TERM /WEDNESDAY NIGHT THROUGH SUNDAY/
A LARGE UPPER LEVEL LOW WILL APPROACH FROM THE GREAT LAKES,
MEANDERING OVER THE NORTHEAST US THROUGH AT LEAST SOME OF THE
WEEKEND. THIS WILL BRING A PERIOD OF NEAR OR BELOW NORMAL
TEMPERATURES THROUGH THE END OF THE WEEK AND INTO THE WEEKEND AS
WELL AS SOME RAIN.
FIRST PERIOD OF RAIN COMES WEDNESDAY NIGHT, WITH WIDESPREAD RAIN
EXPECTED AS SECONDARY AREA OF LOW PRESSURE DEVELOPS ALONG A BOUNDARY
DRAPED OVER THE REGION. RAINFALL AMOUNTS LOOK TO BE AROUND A HALF
INCH TO AN INCH, AS THIS WILL BE A MUCH NEEDED RAIN.
THURSDAY THROUGH FRIDAY WILL BE UNSETTLED WITH GUSTY WINDS AS A
TIGHT GRADIENT SETS UP WITH AN EXPANSIVE AREA OF LOW PRESSURE TO THE
NORTH OVER NEW ENGLAND AND HIGH PRESSURE TO THE SOUTHWEST. SEVERAL
SHORTWAVES WILL ROTATE AROUND THE BASE OF THE UPPER LEVEL LOW,
BRINGING THE POTENTIAL FOR SOME RAIN (AND EVEN SOME POTENTIAL SNOW
IN THE HIGHER ELEVATIONS) SHOWERS THROUGH BOTH DAYS. NOT EXPECTING
ANY SHOWERS TO BE AS HEAVY AS THE RAIN WEDNESDAY NIGHT, BUT EXPECTED
DREARY AND BLUSTERY CONDITIONS TO CLOSE OUT THE WEEK.
THE UPPER LEVEL LOW AND ASSOCIATED SURFACE LOW SLOWLY PULL AWAY BY
THE WEEKEND. DRIER AIR WORKS IN ON THE BACKSIDE OF THE SYSTEM AND
THE WEEKEND AT THIS TIME LOOKS MAINLY DRY WITH TEMPERATURES NEAR
NORMAL FOR LATE NOVEMBER.
AVIATION /08Z MONDAY THROUGH FRIDAY/
THE FOLLOWING DISCUSSION IS FOR KPHL, KPNE, KTTN, KABE, KRDG, KILG,
KMIV, KACY AND SURROUNDING AREAS.
TODAY... VFR CONDITIONS ARE EXPECTED TODAY AS HIGH PRESSURE
BUILDS BACK ACROSS THE AREA. THERE WILL BE VARYING AMOUNTS OF
HIGH CLOUDS ACROSS THE REGION TODAY. WEST TO NORTHWEST WINDS
WILL INCREASE TO 10 TO 12 KNOTS LATE THIS MORNING AND A FEW
GUSTS AROUND 20 KTS POSSIBLE. HIGH CONFID.
TONIGHT... VFR WITH MOSTLY CLEAR SKIES. LIGHT W/NW WINDS. HIGH
CONFID.
OUTLOOK...
TUESDAY THROUGH TUESDAY NIGHT...PRIMARILY VFR. SOME SHOWERS POSSIBLE
AT KACY/KMIV/KILG LATE TUESDAY NIGHT.
WEDNESDAY...PRIMARILY VFR. SCATTERED LIGHT SHOWERS AROUND, MAINLY AT
KRDG/KABE, BUT CONDITIONS SHOULD STAY VFR.
WEDNESDAY NIGHT THROUGH FRIDAY...PERIODS OF MVFR/IFR CONDITIONS
LIKELY WITH PERIODS OF RAIN. RAIN COULD BE A BIT HEAVY ON WEDNESDAY
NIGHT AT TIMES.
MARINE
HIGH PRESSURE FROM THE NORTH REASSERTS CONTROL OF THE WINDS/WEATHER
TODAY AND TONIGHT ACROSS THE WATERS. WINDS AND SEAS BUILD TODAY AND
REMAIN UP A BIT OVERNIGHT. IT APPEARS THAT GUSTS AND SEAS COME UP
SHORT FOR A SCA FLAG BUT SOME GUSTS AROUND 20 KTS ARE POSSIBLE,
ESPECIALLY ACROSS THE NORTH NJ COASTAL WATERS. FAIR WEATHER TODAY
AND TONIGHT.
OUTLOOK...
TUESDAY THROUGH WEDNESDAY...NO MARINE HEADLINES EXPECTED.
WEDNESDAY NIGHT THROUGH FRIDAY...SMALL CRAFT ADVISORY CONDITIONS
EXPECTED (90-100%) WITH GALES POSSIBLE (50-60%).
TIDES/COASTAL FLOODING
DESPITE AN OFFSHORE WIND, TIDE LEVELS REMAIN ELEVATED. THIS IS
DUE TO A COMBINATION OF HIGHER ASTRONOMICAL TIDES FROM THE
RECENT FULL MOON AND THE LOW PRESSURE LOCATED NEAR THE CANADIAN
MARITIMES PUSHING WATER BACK TOWARD THE MID ATLANTIC. THE THREAT
FOR ADVISORY LEVEL COASTAL FLOODING WILL REMAIN FOR THE NEW
JERSEY OCEANFRONT AND THE NEW JERSEY SIDE OF THE DELAWARE BAY
COAST, SO THE COASTAL FLOOD ADVISORY WILL REMAIN FOR THE ENTIRE
NEW JERSEY OCEANFRONT AND NEW JERSEY'S DELAWARE BAY COAST THROUGH
THIS MORNING'S HIGH TIDE CYCLE.
ONLY SPOTTY MINOR TIDAL FLOODING IS EXPECTED ON THE DELAWARE
COAST AND DELAWARE SIDE OF DELAWARE BAY.
COASTAL FLOODING IS NOT EXPECTED TO OCCUR ALONG THE CHESAPEAKE
BAY IN THE EASTERN SHORE OF MARYLAND OR THE TIDAL DELAWARE RIVER.
PHI WATCHES/WARNINGS/ADVISORIES
PA...NONE.
NJ...COASTAL FLOOD ADVISORY UNTIL 2 PM EST THIS AFTERNOON FOR
NJZ013-014-020>027.
DE...NONE.
MD...NONE.
MARINE...NONE.
SYNOPSIS...HOEFLICH/ROBERTSON
NEAR TERM...OHARA
SHORT TERM...HOEFLICH
LONG TERM...HOEFLICH
AVIATION...HOEFLICH/OHARA
MARINE...HOEFLICH/OHARA
TIDES/COASTAL FLOODING...NWS PHI
CLICK HERE TO GO TO PREVIOUS BULLETINS.
Main Text Page