Heavy Rain Forecasted for Philadelphia on September 20, 2026
An automatic weather alert has been issued for Philadelphia, United States, where heavy rain is forecasted on September 20, 2026. The projected precipitation of 34.35 mm is expected to exceed the established threshold of 30 mm.
According to the automated forecasting system of wweather1.com, the alert was generated after the predicted rainfall metric for Philadelphia crossed the designated threshold. The forecast projects a total of 34.35 mm of precipitation, which is categorized as a high-severity rain event.
The weather event is scheduled to begin on September 20, 2026, at 00:00:00.000Z. The alert is based entirely on the website's own automated forecast data, which triggered the notification when the metric exceeded the 30 mm limit.
No manual intervention was involved in generating this notification, as the alert relies on automated data processing to identify regional meteorological developments that meet the high-severity criteria.