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E PA/NJ/DE Summer 2019 OBS Thread


Rtd208
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EAS just went out... Now up to 0.71" total for the day (1.77"/hr rate).  ETA - Flash Flood Warning upgrade for certain areas -

Quote

Flash Flood Warning


Flash Flood Warning
PAC029-045-091-101-150415-
/O.NEW.KPHI.FF.W.0081.190815T0112Z-190815T0415Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/

BULLETIN - EAS ACTIVATION REQUESTED
Flash Flood Warning
National Weather Service Mount Holly NJ
912 PM EDT Wed Aug 14 2019

The National Weather Service in Mount Holly NJ has issued a

* Flash Flood Warning for...
  Southern Montgomery County in southeastern Pennsylvania...
  Northeastern Chester County in southeastern Pennsylvania...
  Northwestern Philadelphia County in southeastern Pennsylvania...
  Northeastern Delaware County in southeastern Pennsylvania...

* Until 1215 AM EDT.

* At 912 PM EDT, Doppler radar indicated thunderstorms producing
  heavy rain across the warned area. Up to two inches of rain have
  already fallen in as little as 30 minutes. Flash flooding is
  expected to begin shortly in the areas of heaviest rain.

* Some locations that could experience flooding include...
  Philadelphia, West Chester, Norristown, Phoenixville, West
  Norriton, East Norriton, Coatesville, Westtown, Downingtown,
  Conshohocken, Ambler, Collegeville, Royersford, Jenkintown,
  Narberth, Trappe, Rockledge, Abington, Bryn Athyn and Pughtown.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

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

&&

LAT...LON 4021 7520 4013 7504 4002 7515 3998 7526
      3989 7580 4017 7580

$$

CS


Quote

Flood Advisory


Flood Advisory
National Weather Service Mount Holly NJ
901 PM EDT Wed Aug 14 2019

PAC017-029-091-101-150215-
/O.CON.KPHI.FA.Y.0206.000000T0000Z-190815T0215Z/
/00000.N.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
Montgomery PA-Bucks PA-Chester PA-Philadelphia PA-
901 PM EDT Wed Aug 14 2019

...THE FLOOD ADVISORY REMAINS IN EFFECT UNTIL 1015 PM EDT FOR CENTRAL
MONTGOMERY...SOUTHEASTERN BUCKS...CENTRAL CHESTER AND NORTHERN
PHILADELPHIA COUNTIES...

At 859 PM EDT, local law enforcement reported minor flooding in
Chester and Montgomery Counties. A multi-vehicle collision occurred
on Highway 202 near West Valley Road in Chester County as a result
of a flooded roadway. Street flooding is also occurring on Gulph
Road and Valley Forge Road in Upper Merion Township. Though the
heavy rainfall is shifting southeast of the advisory area, runoff
will continue to cause problems for the next hour.

Some locations that could experience flooding include...
Philadelphia, West Chester, Bensalem, Norristown, Phoenixville,
Lansdale, West Norriton, East Norriton, Coatesville, Downingtown,
Conshohocken, Hatboro, Ambler, Collegeville, Royersford, Jenkintown,
Parkesburg, Trappe, Rockledge and Abington.

This includes Interstate 95 in Pennsylvania between mile markers 33
and 35.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

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 3994 7598 4006 7585 4027 7549 4017 7486
      4005 7497 4007 7546 3987 7569 3988 7599
      3992 7600

$$

CS

 

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Out climate summary for today in Western Chester County PA was a High of 83.4 and a  Low  of 73.3 for an average temp of 78.4  which is  6.2 degrees above normal .  Of note today marks the last day of the summer season that those of us in Chesco have an average high temp that will exceed 80 degrees until next June 9th.

That of course does not mean we will see more 80+ days like Sunday with even some upper 80's possible thru Wednesday but any 90 plus days seems well out of reach here in western Chester County

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Only got down to 74F overnight. Had a brief shower this morning that made the humidity more humid.

Also, read Paul Pastelok's blog at Accuwx this morning -- while some comfortable air masses will move through, overall the end of Aug/start of Sept looks hot. Possible Sept analogs include 1993, 2004 & 2014.

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15 hours ago, ChescoPaWxman said:

 

That of course does not mean we will see more 80+ days like Sunday with even some upper 80's possible thru Wednesday but any 90 plus days seems well out of reach here in western Chester County

It helps to have your station surrounded by trees and located at nearly 700 feet AMSL ;)

not all of Chesco, or even western Chesco, has those conditions.

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6 hours ago, hazwoper said:

It helps to have your station surrounded by trees and located at nearly 700 feet AMSL ;)

not all of Chesco, or even western Chesco, has those conditions.

Most of the NWS Western Chester County Zone (which is why Mount Holly split the zone) is above 600 ft ASL so yes - most of the zone has not had many 90+ days and should of course not expect many more this season.

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90 or above for high temps today at all of the NWS/FAA sites across the 31 reporting stations across the PA/NJ and DE tri-state area with the exceptions of Mount Pocono at 84 / Cape May County 88 (Sea Isle City only 83.7 w/sea breeze effect) / Andover NJ 89 / and of course Western Chester County with KMQS at 87.8 and East Nantmeal at only 86.2 - marine influence and relative elevation FTW

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Today's Highs across Western Chester County ranged from 87.8 at KMQS and 86.2 in East Nantmeal....of course no heat wave in Western Chester County PA as neither location has seen a day above 90 degrees during this stretch.

Of interest of the 31 NWS/FAA sites across the Tri-State area of PA/NJ/DE only 12 sites or 39% of all such stations reported a heat wave with the last 3 days exceeding the 90 degree mark. While 13 sites saw 2 days over 90; 3 sites saw only 1 day over 90 and of course the old chilly standbys of Mount Pocono; Chester County Airport and East Nantmeal Township saw no such days. If it wasn't for the local news only using PHL airport would a report of a heat wave in the philly area constitute fake news?

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