Flash Flooding and Hail in Pennsylvania, July 28, 1999

A spotter estimated thunderstorm winds to 70 MPH.

Thunderstorm winds downed numerous trees and power lines across the county, producing widespread power outages.

Thunderstorm winds downed several trees.

Thunderstorms moving across the county dumped over 3 inches of rainfall, producing widespread flash flooding across the county. Numerous reports of basement flooding were reported. In New Castle, the water roared down one street with such force it lifted the blacktop off of the road. Many motorists were trapped inside their vehicles in flooded intersections, with one vanload of children trapped on a New Castle street. Despite the widespread flooding, no injuries were reported.

Thunderstorm winds downed a few trees.

Thunderstorms moving across southern portions of the county deposited up to 3.7 inches of rainfall, producing roadway and localized basement flooding in the cities of Sharon and Mercer.

Thunderstorm winds downed numerous trees and power lines countywide. A wind gust to 66 MPH was recorded at the Carnegie Science Center in downtown Pittsburgh. Power was knocked out to 110,000 customers across the county, while another 196,000 households and businesses were left without water for several hours.

Thunderstorm winds downed several trees and power lines.

Thunderstorm winds produced widespread damage across the county, downing numerous trees and power lines. One car was crushed by a large tree in Midland. One beef cattle in Daugherty Township was electrocuted when a wire fell on it. Several other reports of minor damage to siding and roofs were received by the area 911.

Thunderstorm winds downed several trees and power lines.

Thunderstorms passing over the region produced between 3.0 to around 4.5 inches of rain across the county, with the South Hills area of Pittsburgh one of the hardest-hit areas. Numerous roads across the area were flooded, with five towns (Brentwood, Castle Shannon, Mt. Lebanon, Dormont and West Elizabeth) declaring states of emergency due to flooded roadways. In Castle Shannon alone, the volunteer fire department estimated damage "in the hundreds of thousands of dollars" to their facilities and other businesses in town. Many other reports of business and residential basement flooding were also received across the area. Several motorists had to be rescued from their vehicles as they tried to cross flooded roads. The Port Authority's entire light rail line was disabled due to flooding in the two main power stations that control the signals.

Thunderstorm winds downed numerous trees and power lines across the Greensburg area.

Thunderstorm winds downed numerous trees and power lines.

Thunderstorm rains produced minor street flooding and mudslides in the Uniontown area.

Thunderstorm rains produced minor street flooding in West Newton.

Thunderstorm wind downed several trees and power lines.

Thunderstorm rains procuded street and basement flooding across the county. Several vehicles became stranded in flooded roadways. In New Castle, several businesses reported up to a foot of water in their stores, ruining carpeting and inventory. An assisted-living center in Neshannock Township reported several inches of water through their first floor. No residents were injured. In addition, many homes across the area reported basement flooding.