Hi All, occasional lurker and Chester County resident here.
I have done a deep dive on Coatesville 1 SW's history, working through the 530-1, the monthly paper records and property deeds for observers Gordon, Pyle and PECO. I then compared the record of station changes with the breakpoints identified by NOAA/NCEI and Berkeley Earth Surface Temperature (BEST). Claude helped with the graphic.
There is remarkable agreement between the history of changes at 1 SW and the breakpoints detected.
edit: The HOMR record for this station, (presumably pulled from the 1956 530-1 (itself likely pulled from the B44s)) is flawed.
