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The heat index in Sea Isle City NJ was 107 degrees at 1030am - highest ever on the station since 2016 - sea breeze front just passed the house and temps have fallen from 89.5 to 85.6 over last 7 minutes

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God awful out, was 88.4/78 earlier, got some clouds and it went down 86.4/77, now bright sun again.    See a boomer just west of Exton, south of here.    Time to mow and sweat...   Heading north Sunday to days in the upper 60s/low 70s for the next week and color in trees - can't wait.

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Slow storm motion today - some will get pounded

National Weather Service Mount Holly NJ
152 PM EDT Fri Aug 27 2021

The National Weather Service in Mount Holly NJ has issued a

* Severe Thunderstorm Warning for...
  Central Chester County in southeastern Pennsylvania...

* Until 245 PM EDT.

* At 152 PM EDT, a severe thunderstorm was located over Downingtown,
  or near West Chester, and is nearly stationary.
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58 minutes ago, Seanvolz98 said:

I’d love to know how many times this set up has happened this year. This strip shows up on the eastern side of Philly and stretches up towards Trenton. Unreal that this keeps happening 

E5FAE366-061F-4AFB-B685-EF0148F4610B.png

As crazy as it sounds, considering the orientation with respect to the city, I think it's possible that Philly itself is causing these storms.

Dr. Marshall Shepherd has been studying this phenomenon for a long time around Atlanta and concludes that urban areas absolutely can have an influence on thunderstorm formation during the summer. The urban heat island effect provides a warmer environment that its surroundings, making it easier for air to rise. Rising air can also come from air being forced to go over the tall buildings, and the pollution can lead to the formation of cloud droplets. You can see how in the Atlanta rainfall chart attached, the highest rainfall is shown downwind of the city. With winds coming from the SW today, same thing is happening near Philly.

You can read a full summary below.

https://www.atlantastudies.org/2017/07/20/j-marshall-shepherd-does-atlanta-create-its-own-rainstorms/

image.png.fe6bd771083269b52e02f524570cab39.png

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4 minutes ago, ACwx said:

As crazy as it sounds, considering the orientation with respect to the city, I think it's possible that Philly itself is causing these storms.

Dr. Marshall Shepherd has been studying this phenomenon for a long time around Atlanta and concludes that urban areas absolutely can have an influence on thunderstorm formation during the summer. The urban heat island effect provides a warmer environment that its surroundings, making it easier for air to rise. Rising air can also come from air being forced to go over the tall buildings, and the pollution can lead to the formation of cloud droplets. You can see how in the Atlanta rainfall chart attached, the highest rainfall is shown downwind of the city. With winds coming from the SW today, same thing is happening near Philly.

You can read a full summary below.

https://www.atlantastudies.org/2017/07/20/j-marshall-shepherd-does-atlanta-create-its-own-rainstorms/

image.png.fe6bd771083269b52e02f524570cab39.png

Very interesting read, had no idea large buildings in city centers could cause turbulent airflow and force it to rise due to the urban heat island effect. I’m sure more and more articles will be published on this in the future as it becomes more pronounced 

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1 hour ago, Chubbs said:

Slow storm motion today - some will get pounded


National Weather Service Mount Holly NJ
152 PM EDT Fri Aug 27 2021

The National Weather Service in Mount Holly NJ has issued a

* Severe Thunderstorm Warning for...
  Central Chester County in southeastern Pennsylvania...

* Until 245 PM EDT.

* At 152 PM EDT, a severe thunderstorm was located over Downingtown,
  or near West Chester, and is nearly stationary.

It's now 3:00 and it's barely moved.    Gave me some nice outflow breezes and dropped the DP to 69 briefly.

 

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25 minutes ago, iceman56 said:

It's now 3:00 and it's barely moved.    Gave me some nice outflow breezes and dropped the DP to 69 briefly.

 

There are intersecting outflow boundaries in Burlington and Ocean Counties. I know it doesn’t help you much, but cool to see.

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1 minute ago, Rainshadow101 said:

There are intersecting outflow boundaries in Burlington and Ocean Counties. I know it doesn’t help you much, but cool to see.

Here's a sat pic showing the outflow and other boundaries.

COD-GOES-East-local-New_Jersey.02.20210827.191617-over=map-bars=.gif

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3 minutes ago, Rainshadow101 said:

There are intersecting outflow boundaries in Burlington and Ocean Counties. I know it doesn’t help you much, but cool to see.

You mean these outflow boundaries?  Along the red lines I drew.

 

image.png.78c8d11497eb12c5453911b052897bfe.png

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22 minutes ago, cbelke said:

You mean these outflow boundaries?  Along the red lines I drew.

 

image.png.78c8d11497eb12c5453911b052897bfe.png

Could be, need to see an animation. There are several storm outflow boundaries in our area. The Downingtown storm is responsible for the clearing in Chesco/SePa in the pic I posted.

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14 minutes ago, Chubbs said:

Could be, need to see an animation. There are several storm outflow boundaries in our area. The Downingtown storm is responsible for the clearing in Chesco/SePa in the pic I posted.

So you don't necessarily look at radar for the outflow? 

 

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