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E PA/NJ/DE Summer 2025 Obs/Discussion


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Flash flood watch for today starts at 2pm and lasts till 2am. We should see widespread rain and t-storms later today into tonight. Some spots could see 1" to as much as 3" of rain. Shower chances will continue most of the week before finally some improvement toward next weekend. Suspect we may see another flood watch for later tomorrow into Wednesday.

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Radar estimates about 1 1/2” of rain at my place. 5 miles SE there’s been 5-6” of rain with water rescues taking place on route 309. I believe part of the route is still closed since there’s still standing water there.

The only area of the LV that got anything substantial was where that band set up along south mountain into the southern areas of the 3 cities. Most of the Valley looks to have received 1/4” or less - I only got 0.22” in lower macungie. Per radar estimates looks like there was 2“ less than a half mile south of me. It always amazes me how localized storms are in the summertime!


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12 hours ago, ChescoWx said:

1.81" so far in East Nantmeal with 5.91" in July so far.....

Seriously Paul, I am becoming more and more concerned for our area when the tropics visit later in the season due to all these areas picking up 3-8" of rain off and on daily.

 

Water temp down here in Sea Isle had to be close to 80f last two days just walk right on in the water zero getting used to any inkling of cooler waters. I saw an official report of 82f down in Cape May yesterday.  I am not exactly sure what it is here in Sea Isle but yesterday last two days I would estimate 78-79f or so.  There have been three days of east then southeast winds down here currently winds are pretty light and generally west-southwest at like 3 mph. 

I can envision tropical systems turning up the east coast this year as the current trough lifts out and retrogrades west or northwest bound you can almost see it coming. 

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Some rainfall amounts from yesterday Glenmoore 1.63" / East Nantmeal 1.83" / Atglen 0.20" / Chester Springs 0.75" / Devault 0.42" / Kennett Square 1.52" / Longwood Gardens 0.84" / West Bradford 0.75" / Nottingham 0.16" / Warwick Twp. 1.50" / West Chester 0.43'/ West Grove 0.09" / Avondale 2N 0.35" / KOQN Airport 0.36" / KMQS Airport 0.38". Some spots like here in East Nantmeal are up to almost 6" of rain so far this month. But that is nowhere near the record rains for the month of July across Chester and SE Berks Counties - see the top 10 rainy months below. Of course we still have time and more rain looks likely this week....so stay tuned!

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As seems to always be the case in this pattern showers are again likely later today into this evening. Today and tomorrow look like our warmest days...with some spots especially tomorrow possibly touching 90 degrees for the first time here in the month of July. The NWS has issued a heat advisory for tomorrow afternoon. We then turn a bit cooler with high temperatures maybe a couple of degrees below normal, starting Friday and through the weekend with highs in the low 80's. Highest rain chances after this evening look to be Saturday night into Sunday.

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Flood Watch
National Weather Service Mount Holly NJ
1156 AM EDT Wed Jul 16 2025

PAZ054-055-060>062-070-071-101>106-170400-
/O.EXT.KPHI.FA.A.0009.250716T1900Z-250717T0700Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
Carbon-Monroe-Berks-Lehigh-Northampton-Delaware-Philadelphia-
Western Chester-Eastern Chester-Western Montgomery-Eastern
Montgomery-Upper Bucks-Lower Bucks-
Including the cities of Lansdale, Collegeville, Honey Brook,
Perkasie, Stroudsburg, Reading, Media, West Chester, Oxford,
Bethlehem, Doylestown, Norristown, Morrisville, Chalfont, Jim
Thorpe, Pottstown, Kennett Square, Allentown, Easton, and
Philadelphia
1156 AM EDT Wed Jul 16 2025

...FLOOD WATCH NOW IN EFFECT FROM 3 PM EDT THIS AFTERNOON THROUGH
LATE TONIGHT...

* WHAT...Flash flooding caused by excessive rainfall continues to be
  possible.

* WHERE...Portions of east central, northeast, and southeast
  Pennsylvania, including the following areas, in east central
  Pennsylvania, Berks, Lehigh and Northampton. In northeast
  Pennsylvania, Carbon and Monroe. In southeast Pennsylvania,
  Delaware, Eastern Chester, Eastern Montgomery, Lower Bucks,
  Philadelphia, Upper Bucks, Western Chester and Western Montgomery.

* WHEN...From 3 PM EDT this afternoon through late tonight.

* IMPACTS...Excessive runoff may result in flooding of rivers,
  creeks, streams, and other low-lying and flood-prone locations.

* ADDITIONAL DETAILS...
  - Another round of heavy showers and thunderstorms is expected
    late this afternoon through this evening. Storms will be
    capable of dropping a quick 1 to 2 inches of rainfall within
    a 1 to 3 hour period leading to flash flooding. Isolated
    amounts of 2 to 4 inches will be possible.
  - http://www.weather.gov/safety/flood
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