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Flash Flood — Montgomery, Pennsylvania
August 2, 2009 · NOAA Storm Events record
Event narrative (NOAA)
Thunderstorms with torrential downpours caused flash flooding in several municipalities and a major mudslide across southern Montgomery County. Doppler Radar storm total estimates averaged between 2.5 inches and 4.5 inches.||In Lower Merion Township, a mudslide closed both directions of the Schuylkill Expressway at the Conshohocken Curve from 11 a.m. EDT through 230 p.m. EDT. The westbound lanes were reopened first and the eastbound lanes were reopened at 730 p.m. EDT. Motorists were stranded on the expressway when the mudslide initially occurred. Elsewhere in the township, the Mill Creek flooded and washed out a couple of roads in its basin. There were about a half dozen water rescues. West Mill Creek Park was closed indefinitely. The Mill Creek Pumping Station was under five feet of wate
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Source: NOAA/NCEI Storm Events Database. Deaths and injuries are those NOAA classifies as direct. Damage is the reporting office's estimate at the time and is not inflation-adjusted. This is a catalogue record, not a forecast.