Tornado in Pennsylvania, August 20, 1999

Name: Tornado in Pennsylvania, August 20, 1999
Start: 1999-08-20T18:00
End: 1999-08-20T18:05
Location: Pennsylvania

August 20, 1999 · NWS CTP · 1 event in 1 county or zone

1 tornado, as filed by the National Weather Service.

Where it happened

Every event with a place to put it. 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: None recorded
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 tornado. Local standard time, as filed.

Tornado, Adams

When: August 20, 6:00 PM EST to 6:05 PM EST
Where: Adams County, 2 mi W of Littlestown
Measured: 50
Rating: F1
Path length: 0.2 mi
Path width: 40 yd
Reported by: NEWSPAPER
Coordinates: 39.750, -77.120

An F1 tornado (73-112 mph) touched down west of Littlestown, about 1 mile south of Route 97 on Mud College Road, around 7:00 p.m. in the evening. Peak wind gusts probably reached close to 100 mph. The storm took half the roof off a barn, damaged the roof of a home, destroyed a shed, snapped off a number of trees, and uprooted several others. Eyewitnesses told of seeing three small funnels merge into a single cylinder. One told of seeing what he first thought were leaves swirling in the cylinder, realizing later that the debris was composed of roofing material from his neighbor's home.

What these are

Tornado: A violently rotating column of air in contact with the ground and extending from a thunderstorm, filed with its path, width and Fujita or Enhanced Fujita rating from the damage survey.

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 The tornado archive for Pennsylvania, 1999 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: 5713879.