704 FXUS61 KPHI 150752 AFDPHIArea Forecast Discussion National Weather Service Mount Holly NJ 352 AM EDT Wed Oct 15 2025
.SYNOPSIS... A cold front will move through the area today with strong high pressure building in to close out the week. A low pressure system will cross the region from the west Sunday into Monday.
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.NEAR TERM /THROUGH TONIGHT/... Through early this morning, we remain partly cloudy across the area with the clouds decreasing from west to east. Dry weather is anticipated to continue. Winds are around 10-20 mph.
For today, our stubborn low clouds really lessen through daybreak. The remainder of the morning, we see some lingering mid and high clouds that continue to decrease into the afternoon from west to east. By the afternoon, we see more sunshine with a mostly clear sky. There will be a cold front approaching from the northwest that sinks southeast through our area today. This cold front lacks a lot of moisture, so no precip is expected and it does not add much in the way of additional cloud cover. Winds will once again become increasingly gusty after the front passes and we get some noticeable cold air advection where northwest winds may gust up to 20-30 mph in the afternoon. Even with the cold front moving through, our afternoon highs are expected to be mainly in the mid 60s to low 70s.
Behind the cold front, we see a high pressure system building in from the Great Lakes region which continues to allow cold air advection to persist into Wednesday night. Overnight lows will be in the mid 30s to mid 40s for most. Even with some spots falling into the mid to upper 30s tonight, there is not a lot of concern for frost. The colder spots for tonight have already ended their growing season like the Poconos for example. Wind gusts still near 20-25 mph tonight will also limit any potential for frost. We stay mostly clear overnight with the high pressure system building in.
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.SHORT TERM /THURSDAY THROUGH FRIDAY NIGHT/... Canadian high pressure will remain centered over the Great Lakes on Thursday, keeping a brisk northwesterly wind in place, but otherwise providing plenty of sunshine. Highs Thursday in the upper 50s to lower 60s.
The high only moves slightly further east Thursday night, keeping enough gradient overhead to prevent a strong radiational night thanks to a continued breeze, despite clear skies. Lows Thursday night in the mid 30s to lower 40s.
Even Friday, the high will still be just to our west, so while the gradient is finally starting to relax more, the northwest flow will continue. Otherwise, plenty of sun, so highs Friday should reach the low to mid 60s.
Friday night may try to radiate as the high finally moves nearly overhead, but warm advection will already be starting aloft. Lows Friday night in the upper 30s to mid 40s.
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.LONG TERM /SATURDAY THROUGH TUESDAY/... A subtle warm front will cross the region on Saturday, providing a bit more cloud cover but also boosting temps. Highs Saturday rising to the mid to upper 60s.
Southerly flow becomes a bit more dominant on Saturday night which may preclude strong radiational cooling. Additional cloud cover may also begin moving overhead as a stronger storm starts developing to our west. Thus, lows Saturday night should remain in the mid 40s to lower 50s.
Despite increased cloud cover ahead of the aforementioned strengthening storm to our west, stronger southerly flow should also provide enough warm advection to make Sunday the warmest of the forecast period. Highs Sunday in the low to mid 70s.
The aforementioned system likely doesn`t start spreading rain into the region until Sunday night, but with southerly flow and plenty of clouds, it should be the mildest night of the forecast period. Lows Sunday night in the low to mid 50s.
The storm pulls northeastward across the region Monday. Exact timing still a little uncertain, but right now odds favor most rain occurring earlier in the day, with some drying and maybe even clearing possible later on. With weak cold advection behind it, not to mention the rain and showers, highs Monday should stay in the mid to upper 60s.
Depending on the speed of the departure, Monday night could keep a few showers and many clouds around, or could see partial clearing. For now keeping lows Monday night in the mid to upper 40s.
Upper trough may linger through Tuesday, which could keep clouds and even a few showers nearby, but not a washout. Highs Tuesday right now look to be in the mid to upper 60s.
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.AVIATION /07Z WEDNESDAY THROUGH SUNDAY/... The following discussion is for KPHL, KPNE, KTTN, KABE, KRDG, KILG, KMIV, KACY and surrounding areas.
Through 12Z...Lingering MVFR CIGs through 07Z or so, for some of the I-95 terminals. KMIV and KACY look to hold onto MVFR CIGs into 09Z or so. KABE/KRDG/KPNE/KILG have already gone VFR with the other terminals joining through the rest of the night from west to east. N-NW winds around 10 kts or less. Moderate-high confidence.
Wednesday...VFR with SCT high clouds decreasing through the day. N-NW winds 5 to 10 kt in the morning, increasing to 10 to 15 kt with 20 gusts in the afternoon. High confidence.
Wednesday Night...VFR with SKC. A mainly NNW wind around 10 kts with occasional gusts to 20 kts. High confidence.
Outlook... VFR should prevail Thursday through Saturday night. Sub-VFR possible late Sunday as an approaching front increases the risk of showers.
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.MARINE... The Small Craft Advisories on the Atlantic coastal waters are in effect into tonight. A Small Craft Advisory goes into effect on the Delaware Bay at 4 PM today and continues into tonight.
For today, a north-northwest wind around 10-15 kt in the morning will increase to 15- 20 kt in the afternoon with gusts up to 25 kt following a frontal passage. Seas of 6-8 feet. Overnight, northerly winds around 20-25 kt with gusts to 25-30 kt. Seas remain at 6-8 feet. Fair weather outside of SCA conditions.
Outlook... Small Craft Advisory was extended thru Thursday due to continued northwesterly gusts to 30 kts and ocean waves up to 8 feet.
SCA likely will need additional extension through at least Thursday night if not partly into the day Friday as winds and seas will take some additional time to relax.
Beyond Friday, winds go solidly sub-SCA, while wave heights on the ocean may still flirt with the 5 ft SCA criteria, but overall a calmer period Friday night through Saturday night.
Greater risk of SCA returns Sunday ahead of the next cold front, with southerly winds increasing and ocean waves building back solidly above 5 feet.
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.FIRE WEATHER... In the wake of today`s cold front, gusty winds and low humidity will take hold for Thursday. Winds likely gust above 20 mph along with RH`s down below 30 percent during the midday and afternoon. As such, a Special Weather Statement may be warranted, depending on fuel moistures.
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.TIDES/COASTAL FLOODING... Barnegat Bay and the back bays of the Delaware Beaches have been slow to drain. Flow slowly turns more to the north/northwest today. While water levels have lowered some more since yesterday evening, and its now looking a bit more like the only remaining tidal flooding will be sub-advisory minor, will leave existing advisories in place until their 9 AM expiration. Trends are our friend here and it appears this cycle should be the end of it.
No further tidal issues expected elsewhere.
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.PHI WATCHES/WARNINGS/ADVISORIES... PA...None. NJ...Coastal Flood Advisory until 9 AM EDT this morning for NJZ020- 026. DE...Coastal Flood Advisory until 9 AM EDT this morning for DEZ003- 004. MD...None. MARINE...Small Craft Advisory from 4 PM this afternoon to 6 PM EDT Thursday for ANZ430-431. Small Craft Advisory until 6 PM EDT Thursday for ANZ450>455.
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SYNOPSIS...Guzzo/RCM NEAR TERM...Guzzo SHORT TERM...RCM LONG TERM...RCM AVIATION...Guzzo/RCM MARINE...Guzzo/RCM FIRE WEATHER...PHI TIDES/COASTAL FLOODING...PHI
NWS PHI Office Area Forecast Discussion