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A Jordan sunshine recorder (left). The other instrument is a Marvin sunshine recorder. Older recorders required a human observer to interpret the results; recorded results might differ among observers. Modern sunshine recorders use electronics and computers for precise data that do not depend on a human interpreter.
There are at least two types of devices used to detect precipitation: A light emitting diode weather identifier (LEDWI) sensor measures the scintillation pattern of the precipitation falling through the sensor's infrared beam (approximately 50 millimeters in diameter) and determines from a pattern analysis of the particle size and fall velocity whether the precipitation is rain or snow.
The Pennsylvania Department of Education oversees 500 public school districts of Pennsylvania, over 170 public charter schools (2019), Career and Technology Centers/Vocational Technical schools, 29 Intermediate Units, the education of youth in State Juvenile Correctional Institutions, and publicly funded preschools (Head Start and PreK Counts ...
A system used to detect weapons in schools and stadiums is coming under scrutiny as the company is accused of using misleading claims to sell its service. FTC settles with weapon detector maker ...
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Pennsylvania’s Punxsutawney Phil might be the most well-known weather-predicting groundhog, but a new list casts doubt on his accuracy. Phil did so poorly that even nonliving critters outshine ...
Circa the late 1960s the number of school districts was 2,277. The state government had passed laws encouraging these districts to merge with one another, so the figure fell to 669, and then 501, in the 1970s and then in 1981. [1] There are approximately 500 public school districts in Pennsylvania as of 2023.