For the 2nd Friday in July, there was flooding in the historic Wingohocking Creek Watershed, this time at E Mt Pleasant Ave and Sprague St. The previous July 2020 flood occured at Belfield and Church on July 10th (link).
Here is a short video that shows the flooding between the SEPTA bridge and Devon St.
This flooding was caused by the blocked stormwater inlet shown in this picture.
The July 11th Belfield and Church flooding (link), on the other hand, was caused by too much stormwater runoff overwhelming the sewers in that area.
The July 24 rainfall for Philadelphia is shown in this map which shows that our area got 1.5 – 2 inches and parts of Germantown got 2.5 – 3 inches.
As our global climate warms, we are seeing more intense rain storms. The July 10 and July 24 storms are an example of what we can expect. Please let me know if you see historic Wingohocking Watershed flooded intersections, railroad underpasses of other flooding so that we can log and document them to make sure that the City is aware and taking steps to both clear our inlets and increase our combined sewer capacity to reduce future flooding.
If you live near on of PWD’s 24 flood prone intersections (link) please be sure to get homeowners – renters insurance.
This animated gif shows changes in annual mean temperature at 12 East Coast USA airports that had continuous daily data for the 1950 – 2015 period. The data was retrieved from Weather Underground using the R weatherData package .
11 of the 12 airports (all but JAX) show statistically significant increases in annual mean temperatures.
It’s been a hot summer in Philadelphia so far this year. I started wondering in the global warming has anything to do with our recent spate of 90+ days.
First, lets look at the global warming situation. NASA has announced that July, 2016 is the warmest month on record (here, here). We are well on our way to the 3rd year of record breaking global temperatures.
NASA’s GISS Temperature Anomaly Trend
Is there a connection between global temperature increases and our 90+ summer? To find out, I first downloaded temperature data from the Weather Underground for Philadelphia’s NE Airport. I then plotted the daily maximum and minimum temperatures for the summer months of May through yesterday.
On first glance at the chart, I was sure that I found proof that our 33 90+ days was proof that global warming has hit Philadelphia. As I dug deeper I found that the number of 90+ days varies from a low of 6 in 1978, to 41 in 2010 and a high of 43 in 1988. We are in the high end of the 6 – 43 day ranges of 90+ temperatures range of the number of 90+ days we have had in the 1975 – 2015 period.
We need to dig deeper to find links between the number of Philadelphia’s dog days of summer and global warming. I’ll be writing on this more in the comming months.