Flash Flood in Pennsylvania, August 20, 1999

Name: Flash Flood in Pennsylvania, August 20, 1999
Start: 1999-08-20T14:00
End: 1999-08-20T20:00
Location: Pennsylvania

August 20, 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

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The toll

Deaths: 0
Injuries: 0
Property damage: $500,000
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.

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Event by event

1 flash flood. Local standard time, as filed.

Flash Flood, Juniata

When: August 20, 2:00 PM EST to 8:00 PM EST
Where: Juniata County, Richfield
Property damage: $500,000
Reported by: EMERGENCY MANAGER
Coordinates: 40.531, -77.402 (the zone’s center; the record gives no point)

Heavy rain fell in a band from eastern Juniata County northeast across Selinsgrove and Lewisburg to Muncy. Rainfall totals of 8 to 9 inches were reported in the Richfield area. Several trailers were washed away, 30 homes and 4 businesses were damaged along with a number of roads and bridges. A nursery lost about $100,000 worth of plants along Mahantango Creek.

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

Every storm in Pennsylvania in 1999 Every state in 1999 This day in weather history Warnings in Pennsylvania, August 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 2026-09-24. Each event’s entry at NCEI: 5713877.