Pennsylvania, 1999

Flash Flood in Pennsylvania, September 16, 1999

September 16, 1999 · NWS CTP · 1 event in 1 county or zone

1 flash flood, as filed by the National Weather Service.

Where it happened

Every event with a place to put it; 1 filed by county or forecast zone are drawn at its center, in a lighter ring. Tap one for its entry below.

  • Tornadoes
  • Tropical storms and surge
  • Floods
  • Wind
  • Hail
  • Winter weather
  • Heat and drought
  • Cold
  • Fire, smoke and dust
  • Marine and coastal
  • Other

Open the live radar over this ground

The toll

Deaths
0
Injuries
0
Property damage
$1.6 million
Crop damage
None recorded
Events
1

Deaths and injuries are direct and indirect together, as the offices filed them. Damage is property and crops in the dollars of the year, not adjusted for inflation, and only where an office estimated it.

The radar

The national radar mosaic for the moment the first event began.

Open the radar archive at this moment

Event by event

1 flash flood. Local standard time, as filed.

Flash Flood, Lancaster

When
September 16, 1:00 PM EST to 9:00 PM EST
Where
Lancaster County, Countywide
Property damage
$1.6 million
Reported by
EMERGENCY MANAGER
Coordinates
40.042, -76.248 (the zone’s center; the record gives no point)

Hurricane Floyd moved inland across North Carolina before sunrise on Thursday, September 16th, accelerated northward over eastern Virginia during the morning, crossed eastern Maryland by Thursday afternoon, and reached Long Island by evening. In its wake, heavy rains fell across North Carolina and Virginia into Pennsylvania. Although not nearly as severe as the destruction across areas to the south and east, the middle and lower Susquehanna region of central Pennsylvania endured 24-hour rainfall totals of 5 to 10 inches that flooded roads, fields, basements, small streams, and the Conestoga River that flows through the city of Lancaster. President Clinton declared Lancaster and York counties major disaster areas, along with other counties to the east.Hardest hit in the region was Lancaster County. By mid-afternoon Thursday, many roads were closed, school children had been returned home, and water rescues were underway. Most significant flooding began around 2:00 p.m. EDT as rainfall totals in Dauphin, Lancaster, Lebanon, Schuylkill, and York counties approached 4 and 5 inches.There were no directly related fatalities in the area, although two people died when their van skidded and struck a tree when the vehicle hydroplaned on the Marietta Pike in Lancaster County. Around 2:00 p.m., a 15-year old boy attempted to bring family pets to safety from the backyard when the waters of Muddy Creek rose rapidly, trapping him. The young man was rescued by boat as he clung to a tree trunk in water up to his chest. A volunteer firefighter was also injured during cleanup when tree branches fell on him and he hit his head on a guardrail. A number of people were stranded in their vehicles when they intentionally drove around road closure signs. Some even moved road barriers so they could proceed.The Conestoga River in the city of Lancaster flooded Thursday evening and crested at 16.39 feet early Friday morning. Major damage occurred on the northeast side of the city, and four neighborhoods were evacuated. The crest was the 4th highest flood of record at the site.Other areas of the lower and middle Susquehanna region endured flooding of a lesser magnitude with flooding of small streams, roads, and basements. A mobile home park in eastern York County was evacuated as waters approached floor levels of the homes.

What these are

Flash Flood
Flooding that begins within six hours of the rain that causes it, or of a dam or levee failure or ice jam release, often with deadly speed.

After NWS Directive 10-1605, the rules offices file Storm Data by.

The same day elsewhere

More

Every storm in Pennsylvania in 1999Every state in 1999This day in weather historyWarnings in Pennsylvania, September 1999

Sources

NOAA National Centers for Environmental Information, Storm Events Database, compiled from the National Weather Service’s monthly Storm Data. Complete through 2026-06; NCEI adds each month about 75 days after it ends and revises past years a few times a year. Rebuilt 2026-10-01. Each event’s entry at NCEI: 5722719.