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E PA/NJ/DE Summer 2020 OBS Thread


Rtd208
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Figured the stuff out west would move this way but wasn't sure how much it would hang together but it did (mainly because of the front moving it along).  The lightning/thunder woke me up around midnight and deposited 0.09" just before 1 am and the on and off light rain has deposited another 0.05" since, with a total of 0.14" at post time. Was able to grab a snapshot of that stuff that woke me up.

Currently misty and 73.

radar65-07232020.png

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Well the bright overcast didn't last long and I'm getting rain again.  Just as I typed this, the skies opened up and a pop-up blew up right over me with almost 1"/hr rates. Currently 75 with a rain shower.  In the meantime, this morning offered the rare opportunity to turn the oven on and get a casserole in and out, and not have to worry about long-lasting house-as-furnace.  :lol:

radar20-07242020.png

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I was unable to get an accurate total of last night's rain, but I was getting 3.60" rates per hour and it was coming down like that for 30-40 minutes. Ponding in the basement this morning, I've got the dehumidifier running down there. 75F/DP 74.

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Another intensified cell just blew up and threw me past the 1" rain mark total (since midnight) for today.  Currently at 1.17" (1.00" at post time more since just after midnight) with temp 74 and heavy rain.

ETA - now at 1.29" (2"/hr rates again) for the day and with the antecedent wet conditions, this may cause ponding and whatnot.

radar26-07242020.png

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1 minute ago, JTA66 said:

Looks like it keeps back building over NW Philly.

Am almost at 1.50" of rain just from that alone.  Currently sitting at 1.65" for the day (1.48" from my earlier total).  That brings my July total rain up to 9.57" (so far). :o  The heaviest portion finally moved just south and east of me and the sky is making an attempt to brighten a bit.

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Thank you Mike!!!

Quote

Flash Flood Warning


Flash Flood Warning
NJC007-PAC101-241645-
/O.NEW.KPHI.FF.W.0026.200724T1443Z-200724T1645Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/

BULLETIN - EAS ACTIVATION REQUESTED
Flash Flood Warning
National Weather Service Mount Holly NJ
1043 AM EDT Fri Jul 24 2020

The National Weather Service in Mount Holly NJ has issued a

* Flash Flood Warning for...
  Northwestern Camden County in southern New Jersey...
  Central Philadelphia County in southeastern Pennsylvania...

* Until 1245 PM EDT.

* At 1041 AM EDT, Doppler radar indicated showers and thunderstorms
  producing heavy rain across the warned area. Up to two inches of
  rain have already fallen. Flash flooding is ongoing or expected to
  begin shortly. Frankford Creek in Philadelphia is rising rapidly
  and nearing flood stage.

  HAZARD...Flash flooding caused by thunderstorms.

  SOURCE...Radar indicated.

  IMPACT...Flooding of small creeks and streams, urban areas,
           highways, streets and underpasses as well as other
           drainage and low lying areas.

* Some locations that could experience flooding include...
  Philadelphia, Camden, Gloucester City, Palmyra, Westville,
  Wissinoming, Ben Franklin Bridge, Germantown, Kensington, Center
  City, Golden Triangle, Pennsauken, Collingswood, Merchantville and
  Woodlynne.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

Turn around...don`t drown when encountering flooded roads. Most
flood deaths occur in vehicles.

Excessive runoff from heavy rainfall will cause flooding of small
creeks and streams, urban areas, highways, streets, and underpasses
as well as other drainage areas and low lying spots.

&&

LAT...LON 3988 7513 3999 7522 4007 7518 4007 7514
      4005 7512 4006 7509 4001 7504 3999 7506
      4000 7504 3997 7501

FLASH FLOOD...RADAR INDICATED
EXPECTED RAINFALL...1-2 INCHES IN 1 HOUR

$$

Gorse


 

radar36-07242020.png

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56 minutes ago, Hurricane Agnes said:

Am almost at 1.50" of rain just from that alone.  Currently sitting at 1.65" for the day (1.48" from my earlier total).  That brings my July total rain up to 9.57" (so far). :o  The heaviest portion finally moved just south and east of me and the sky is making an attempt to brighten a bit.

Have you heard about any flooding in Philadelphia? What was your rainfall total from the cell that prompted the Flash Flood Warning? Thanks in advance.

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2 minutes ago, MGorse said:

Have you heard about any flooding in Philadelphia? What was your rainfall total from the cell that prompted the Flash Flood Warning? Thanks in advance.

I haven't been out but I know some places right down the street (and hill) from me that tend to flood with rain rates like that.  I got 1.48" of rain between about 9:20 am and 10:20 am where I am (Chestnut Hill).   The highest rate on my station was 2.41"/hr at 10:09 am.

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Just now, Hurricane Agnes said:

I haven't been out but I know some places right down the street (and hill) from me that tend to flood with rain rates like that.  I got 1.48" of rain between about 9:20 am and 10:20 am where I am (Chestnut Hill).   The highest rate on my station was 2.41"/hr at 10:09 am.

Thank you, appreciate it!

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Kinda delayed based on how often the USGS gauge updates on the Wissahickon (the "at the mouth" gauge which is where it comes out into the Schuylkill) but it is starting to register whatever is flowing into it (11 am update) -

USGS.01474000.121529.00065..20200717.202

I don't live that far from the Cresheim Creek (which is a feeder to the Wissahickon Creek) and that little creek runs at the bottom of several hills and floods Cresheim Valley Drive all the time with even just run-of-the-mill heavy rain.

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