At 5:46 PM EDT, 2 WNW Horsham [Montgomery Co, PA] 911 CALL CENTER reports TSTM WND DMG. MULTIPLE BUILDINGS HAD THEIR ROOFS BLOWN OFF ALONG NORRISTOWN ROAD. NORRISTOWN ROAD IS COMPLETELY BLOCKED WITH DEBRIS. POSSIBLE TORNADO. TIME ESTIMATED FROM RADAR. https://t.co/lWmUP9lkvO

— IEMBot PHI (@iembot_phi) September 1, 2021